// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {IERC20, SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {UnitConverter} from "./libraries/UnitConverter.sol";
import {VestingCustomRefund} from "./VestingCustomRefund.sol";
import {IFactoryImplementation} from "./interfaces/IFactoryImplementation.sol";
import {IVestingCustomRefund} from "./interfaces/IVestingCustomRefund.sol";
import {IVestingCustomRefundProject} from "./interfaces/IVestingCustomRefundProject.sol";
import {IVestingCustomRefundUser} from "./interfaces/IVestingCustomRefundUser.sol";

/**
 * @title VestingCustomRefundUser
 * @author Tim Loh
 * @notice Provides an implementation of custom vesting with refund for user interface
 */
contract VestingCustomRefundUser is VestingCustomRefund, IVestingCustomRefundUser {
    using SafeERC20 for IERC20;
    using UnitConverter for uint256;

    struct PaymentReceivedInfo {
        address paymentVestingAddress; // Address of custom vesting contract containing payment tokens received
        uint256 rate; // How many weis one token costs in payment token
    }

    uint256 public constant TOKEN_RATE_SCALE = 10 ** TOKEN_MAX_DECIMALS;

    PaymentReceivedInfo private _paymentReceivedInfo;

    /**
     * @param tokenAddress_ The address of vesting token
     * @param tokenDecimals_ The number of decimals for vesting token
     * @param allowAccumulate_ `true` if multiple grant amounts is allowed to accumulate for the same user,
     *                         `false` if a user can only have one grant
     * @param backofficeAdminAddress The address that will be assigned the backoffice role admin role and backoffice
     *                               contract admin role
     * @param tenantAdminAddress The address that will be assigned the tenant role admin role, tenant governance role
     *                           and tenant contract admin role
     */
    function initialize(
        address tokenAddress_,
        uint256 tokenDecimals_,
        bool allowAccumulate_,
        address backofficeAdminAddress,
        address tenantAdminAddress
    ) public virtual override initializer {
        __VestingCustomRefundUser_init(
            tokenAddress_,
            tokenDecimals_,
            allowAccumulate_,
            backofficeAdminAddress,
            tenantAdminAddress
        );
    }

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function __VestingCustomRefundUser_init(
        // solhint-disable-previous-line func-name-mixedcase
        address tokenAddress_,
        uint256 tokenDecimals_,
        bool allowAccumulate_,
        address backofficeAdminAddress,
        address tenantAdminAddress
    ) internal onlyInitializing {
        __VestingCustomRefund_init_unchained(
            tokenAddress_,
            tokenDecimals_,
            allowAccumulate_,
            backofficeAdminAddress,
            tenantAdminAddress
        );
        __VestingCustomRefundUser_init_unchained();
    }

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function __VestingCustomRefundUser_init_unchained() internal onlyInitializing {
        // solhint-disable-previous-line func-name-mixedcase, no-empty-blocks
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function cancelRefundWindow() external virtual override onlyRole(BACKOFFICE_CONTRACT_ADMIN_ROLE) {
        // solhint-disable-previous-line ordering

        _cancelRefundWindow();

        if (_paymentReceivedInfo.paymentVestingAddress != address(0)) {
            require(
                IVestingCustomRefundProject(_paymentReceivedInfo.paymentVestingAddress).cancelRefundWindow(),
                "VCRU: cancel payment refund"
            );
        }
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function extendRefundWindow(
        uint256 newDurationSeconds
    ) external virtual override onlyRole(BACKOFFICE_CONTRACT_ADMIN_ROLE) {
        _extendRefundWindow(newDurationSeconds);

        if (_paymentReceivedInfo.paymentVestingAddress != address(0)) {
            require(
                IVestingCustomRefundProject(_paymentReceivedInfo.paymentVestingAddress).extendRefundWindow(
                    newDurationSeconds
                ),
                "VCRU: extend payment refund"
            );
        }
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function refund() external virtual override whenNotPaused {
        require(!hasRefundedFor(msg.sender), "VCRU: refunded");
        require(!hasReleasedFor(msg.sender), "VCRU: claimed");

        uint256 refundableTokenAmount = _refundableAmountFor(msg.sender);
        require(refundableTokenAmount > 0, "VCRU: zero token refundable");

        uint256 refundableTokenDecimalsAmount = refundableTokenAmount.scaleWeiToDecimals(tokenDecimals);
        uint256 refundableTokenWeiAmount = refundableTokenDecimalsAmount.scaleDecimalsToWei(tokenDecimals);
        require(refundableTokenWeiAmount > 0, "VCRU: zero token refund");

        uint256 refundablePaymentAmount = _paymentReceivedInfo.rate > 0
            ? (refundableTokenWeiAmount * _paymentReceivedInfo.rate) / TOKEN_RATE_SCALE
            : 0;
        require(
            _paymentReceivedInfo.paymentVestingAddress == address(0) || refundablePaymentAmount > 0,
            "VCRU: zero payment refund"
        );

        _refund(msg.sender, refundableTokenWeiAmount);

        emit TokensRefunded(msg.sender, refundableTokenWeiAmount, refundablePaymentAmount);

        if (_paymentReceivedInfo.paymentVestingAddress != address(0)) {
            require(
                IVestingCustomRefundProject(_paymentReceivedInfo.paymentVestingAddress).refund(
                    msg.sender,
                    refundablePaymentAmount
                ),
                "VCRU: refund payment"
            );
        }
    }

    /**
     * @inheritdoc IVestingCustomRefund
     * @dev Cannot claim if have previously refunded
     */
    function release() external virtual override(VestingCustomRefund, IVestingCustomRefund) whenNotPaused {
        require(!hasRefundedFor(msg.sender), "VCRU: refunded");

        uint256 releasableAmount = releasableAmountFor(msg.sender);

        _release(msg.sender, releasableAmount);
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function removePaymentReceivedInfo() external virtual override onlyRole(BACKOFFICE_CONTRACT_ADMIN_ROLE) {
        require(!hasRefundWindowStarted(block.timestamp), "VCRU: refund started");

        address paymentVestingAddress = _paymentReceivedInfo.paymentVestingAddress;
        uint256 rate = _paymentReceivedInfo.rate;

        _paymentReceivedInfo.paymentVestingAddress = address(0);
        _paymentReceivedInfo.rate = 0;

        emit PaymentReceivedInfoRemoved(msg.sender, paymentVestingAddress, rate);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     * @dev Cannot revoke if have previously refunded
     */
    function revokeVestingGrant(
        address account
    ) external virtual override(VestingCustomRefund, IVestingCustomRefund) onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        require(!hasRefundedFor(account), "VCRU: refunded");

        _revokeVestingGrant(account);
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function setPaymentReceivedInfo(
        address paymentVestingAddress,
        uint256 rate
    ) external virtual override onlyRole(BACKOFFICE_CONTRACT_ADMIN_ROLE) {
        require(paymentVestingAddress != address(0), "VCRU: payment vesting");
        require(rate > 0, "VCRU: rate");
        require(!hasRefundWindowStarted(block.timestamp), "VCRU: refund started");

        _paymentReceivedInfo.paymentVestingAddress = paymentVestingAddress;
        _paymentReceivedInfo.rate = rate;

        emit PaymentReceivedInfoSet(msg.sender, paymentVestingAddress, rate);

        bool supportsVestingCustomRefundProjectInterface = IVestingCustomRefundProject(paymentVestingAddress)
            .supportsInterface(type(IVestingCustomRefundProject).interfaceId);
        require(supportsVestingCustomRefundProjectInterface, "VCRU: interface");

        if (isRefundWindowDefined()) {
            (uint256 startTimestamp, uint256 durationSeconds, ) = getRefundWindow();

            require(
                IVestingCustomRefundProject(paymentVestingAddress).setRefundWindow(startTimestamp, durationSeconds),
                "VCRU: project set refund"
            );
        } else {
            // https://github.com/crytic/slither/wiki/Detector-Documentation#unused-return
            // slither-disable-next-line unused-return
            (uint256 startTimestamp, , ) = IVestingCustomRefundProject(paymentVestingAddress).getRefundWindow();

            if (startTimestamp > 0) {
                require(
                    IVestingCustomRefundProject(paymentVestingAddress).cancelRefundWindow(),
                    "VCRU: project cancel refund"
                );
            }
        }
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function setRefundWindow(
        uint256 startTimestamp,
        uint256 durationSeconds
    ) external virtual override onlyRole(BACKOFFICE_CONTRACT_ADMIN_ROLE) {
        require(startTimestamp > block.timestamp, "VCRU: start timestamp");
        require(isVestingScheduleDefined(), "VCRU: undefined schedule");
        require(hasVestingScheduleStarted(startTimestamp), "VCRU: before schedule start");

        _setRefundWindow(startTimestamp, durationSeconds);

        if (_paymentReceivedInfo.paymentVestingAddress != address(0)) {
            require(
                IVestingCustomRefundProject(_paymentReceivedInfo.paymentVestingAddress).setRefundWindow(
                    startTimestamp,
                    durationSeconds
                ),
                "VCRU: set payment refund"
            );
        }
    }

    /**
     * @inheritdoc IFactoryImplementation
     */
    function factoryImplementationType()
        external
        view
        virtual
        override(VestingCustomRefund, IFactoryImplementation)
        returns (uint256 implementationType)
    {
        implementationType = 0x59eb2902326a23c3fb6e66c499c661a6165df892fc643c67c712570ad48e50d3;
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function getPaymentReceivedInfo()
        external
        view
        virtual
        override
        returns (address paymentVestingAddress, uint256 rate)
    {
        paymentVestingAddress = _paymentReceivedInfo.paymentVestingAddress;
        rate = _paymentReceivedInfo.rate;
    }

    /**
     * @inheritdoc IVestingCustomRefundUser
     */
    function refundableAmountFor(address account) external view virtual override returns (uint256 refundableAmount) {
        refundableAmount = _refundableAmountFor(account);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {IAdminPrivileges} from "./interfaces/IAdminPrivileges.sol";

/**
 * @title AdminPrivileges
 * @author Tim Loh
 * @notice Provides admin privileges role definitions that are inherited by other contracts
 */
contract AdminPrivileges is AccessControl, IAdminPrivileges {
    bytes32 public constant BACKOFFICE_ROLE_ADMIN_ROLE = keccak256("BACKOFFICE_ROLE_ADMIN_ROLE");
    bytes32 public constant BACKOFFICE_GOVERNANCE_ROLE = keccak256("BACKOFFICE_GOVERNANCE_ROLE");
    bytes32 public constant BACKOFFICE_CONTRACT_ADMIN_ROLE = keccak256("BACKOFFICE_CONTRACT_ADMIN_ROLE");

    bytes32 public constant TENANT_ROLE_ADMIN_ROLE = keccak256("TENANT_ROLE_ADMIN_ROLE");
    bytes32 public constant TENANT_GOVERNANCE_ROLE = keccak256("TENANT_GOVERNANCE_ROLE");
    bytes32 public constant TENANT_CONTRACT_ADMIN_ROLE = keccak256("TENANT_CONTRACT_ADMIN_ROLE");
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {IAdminWallet} from "./interfaces/IAdminWallet.sol";

/**
 * @title AdminWallet
 * @author Tim Loh
 * @notice Provides an implementation of the admin wallet interface that is inherited by other contracts
 */
contract AdminWallet is IAdminWallet {
    address private _adminWallet;

    /**
     * @inheritdoc IAdminWallet
     */
    function adminWallet() public view virtual override returns (address) {
        return _adminWallet;
    }

    /**
     * @dev Change admin wallet that will receive the funds to a new wallet address
     * @param newWallet The new admin wallet address
     */
    function _setAdminWallet(address newWallet) internal virtual {
        require(newWallet != address(0), "AdminWallet: new wallet");

        address oldWallet = _adminWallet;
        _adminWallet = newWallet;

        emit AdminWalletChanged(oldWallet, newWallet, msg.sender);
    }
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

/**
 * @title AdminPrivileges Interface
 * @author Tim Loh
 * @notice Interface for admin privileges role definitions that are inherited by other contracts
 */
interface IAdminPrivileges {
    // solhint-disable func-name-mixedcase

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function BACKOFFICE_ROLE_ADMIN_ROLE() external view returns (bytes32);

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function BACKOFFICE_GOVERNANCE_ROLE() external view returns (bytes32);

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function BACKOFFICE_CONTRACT_ADMIN_ROLE() external view returns (bytes32);

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function TENANT_ROLE_ADMIN_ROLE() external view returns (bytes32);

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function TENANT_GOVERNANCE_ROLE() external view returns (bytes32);

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function TENANT_CONTRACT_ADMIN_ROLE() external view returns (bytes32);

    // solhint-enable func-name-mixedcase
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

/**
 * @title AdminWallet Interface
 * @author Tim Loh
 * @notice Interface for admin wallet that will receive the funds
 */
interface IAdminWallet {
    /**
     * @notice Emitted when admin wallet has been changed from `oldWallet` to `newWallet`
     * @param oldWallet The wallet before the wallet was changed
     * @param newWallet The wallet after the wallet was changed
     * @param sender The address that changes the admin wallet
     */
    event AdminWalletChanged(address indexed oldWallet, address indexed newWallet, address indexed sender);

    /**
     * @notice Returns the admin wallet address that will receive the funds
     * @return Admin wallet address
     */
    function adminWallet() external view returns (address);
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

/**
 * @title IFactoryImplementation
 * @author Tim Loh
 * @notice Provides factory implementation type that is inherited by reference implementation contracts for matching
 *         with corresponding factory contracts
 */
interface IFactoryImplementation {
    function factoryImplementationType() external view returns (uint256);
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {IAccessControl} from "@openzeppelin/contracts/access/IAccessControl.sol";
import {IAdminPrivileges} from "./IAdminPrivileges.sol";
import {IAdminWallet} from "./IAdminWallet.sol";
import {IFactoryImplementation} from "./IFactoryImplementation.sol";

/**
 * @title IVestingCustomRefund
 * @author Tim Loh
 * @notice Interface for custom vesting with refund
 */
interface IVestingCustomRefund is IAccessControl, IAdminPrivileges, IAdminWallet, IFactoryImplementation {
    /**
     * @notice Emitted when refund window has been cancelled
     * @param sender The address that cancelled the refund
     * @param refundStartTimestamp Timestamp when cancelled refund window will start
     * @param refundDurationSeconds Duration of cancelled refund window in seconds
     * @param refundEndTimestamp Timestamp when cancelled refund window will end
     */
    event RefundWindowCancelled(
        address indexed sender,
        uint256 refundStartTimestamp,
        uint256 refundDurationSeconds,
        uint256 refundEndTimestamp
    );

    /**
     * @notice Emitted when refund window has been extended
     * @param sender The address that extended the refund window
     * @param newDurationSeconds Refund window duration in seconds after extension
     * @param newEndTimestamp Timestamp when refund window will end after extension
     * @param oldDurationSeconds Refund window duration in seconds before extension
     * @param oldEndTimestamp Timestamp when refund window will end before extension
     */
    event RefundWindowExtended(
        address indexed sender,
        uint256 newDurationSeconds,
        uint256 newEndTimestamp,
        uint256 oldDurationSeconds,
        uint256 oldEndTimestamp
    );

    /**
     * @notice Emitted when refund window has been set
     * @param sender The address that set the refund window
     * @param startTimestamp Timestamp when refund window will start
     * @param durationSeconds Refund window duration in seconds
     * @param endTimestamp Timestamp when refund window will end
     */
    event RefundWindowSet(
        address indexed sender,
        uint256 startTimestamp,
        uint256 durationSeconds,
        uint256 endTimestamp
    );

    /**
     * @notice Emitted when vesting schedule has been set
     * @param sender The address that set the vesting schedule
     * @param startTimestamps Array specifying the start timestamps of each period
     * @param percentReleases Array specifying the percentage of grant amount to be released for each period
     * @param durationsDays Array specifying the duration in days of each period
     */
    event ScheduleSet(
        address indexed sender,
        uint256[] startTimestamps,
        uint256[] percentReleases,
        uint256[] durationsDays
    );

    /**
     * @notice Emitted when vested tokens have been released to `account`
     * @param account The address that received the released tokens
     * @param amount The amount of tokens in wei transferred to `account`
     */
    event TokensReleased(address indexed account, uint256 amount);

    /**
     * @notice Emitted when unused tokens have been transferred to the admin wallet
     * @param sender The address that initiated the transfer of unused tokens
     * @param unusedAmount The amount of tokens in wei transferred to the admin wallet
     * @param balanceInWei The amount of tokens in wei held by the custom vesting contract before transfer
     * @param totalReleasedAmount The total amount of tokens in wei that has been released so far
     * @param totalRevokedAmount The total amount of tokens in wei that has been revoked so far
     * @param totalRefundAmount The total amount of tokens in wei that has been refunded so far
     * @param totalGrantAmount The total vesting grant token amount in wei that has been added so far
     */
    event UnusedTokensTransferred(
        address indexed sender,
        uint256 unusedAmount,
        uint256 balanceInWei,
        uint256 totalReleasedAmount,
        uint256 totalRevokedAmount,
        uint256 totalRefundAmount,
        uint256 totalGrantAmount
    );

    /**
     * @notice Emitted when vesting grant has been added
     * @param account The address that has the vesting grant added
     * @param grantAmount The grant token amount in wei
     * @param isRevocable `true` if vesting grant is revocable
     *                    `false` if vesting grant is not revocable
     */
    event VestingGrantAdded(address indexed account, uint256 grantAmount, bool isRevocable);

    /**
     * @notice Emitted when vesting grant has been revoked
     * @param account The address that has the vesting grant revoked
     * @param remainderAmount The amount of tokens in wei that has been revoked for `account`
     * @param grantAmount The grant token amount in wei
     * @param refundedAmount The amount of tokens in wei that has been refunded to `account`
     * @param releasedAmount The amount of tokens in wei that has been released to `account`
     */
    event VestingGrantRevoked(
        address indexed account,
        uint256 remainderAmount,
        uint256 grantAmount,
        uint256 refundedAmount,
        uint256 releasedAmount
    );

    /**
     * @notice Add vesting grant for `account`
     * @dev Must be called by tenant contract admin role
     * @dev grant can only be added before schedule start
     * @dev grant cannot be added if previous grant has been revoked
     * @dev isRevocable will be ignored if grant already added but amount allowed to accumulate
     * @param account The address that will have the vesting grant added
     * @param grantAmount The token amount in wei to be granted
     * @param isRevocable `true` if vesting grant is revocable
     *                    `false` if vesting grant is not revocable
     */
    function addVestingGrant(address account, uint256 grantAmount, bool isRevocable) external;

    /**
     * @notice Batch add vesting grants for specified `accounts`
     * @dev Must be called by tenant contract admin role
     * @param accounts Array specifying the addresses that will have the vesting grants added
     * @param grantAmounts Array specifying the amount of tokens in wei to be granted for each account
     * @param isRevocables Array soecuftubg whether each grant is revocable
     */
    function addVestingGrantsBatch(
        address[] memory accounts,
        uint256[] memory grantAmounts,
        bool[] memory isRevocables
    ) external;

    /**
     * @notice Pause user functions
     * @dev Must be called by tenant contract admin role
     */
    function pauseContract() external;

    /**
     * @notice Release vested tokens to sender
     * @dev Can only release if vesting schedule is defined
     * @dev Can only release when vesting schedule has started
     * @dev Cannot release if grant has been revoked
     */
    function release() external;

    /**
     * @notice Revoke vesting grant for `account`
     * @dev Must be called by tenant contract admin role
     * @dev Only revocable grants can be revoked
     * @param account The address that will have the vesting grant revoked
     */
    function revokeVestingGrant(address account) external;

    /**
     * @notice Batch revoke vesting grants for specified `accounts`
     * @dev Must be called by tenant contract admin role
     * @dev Only revocable grants can be revoked
     * @param accounts Array specifying the addresses that will have the vesting grants revoked
     */
    function revokeVestingGrantsBatch(address[] memory accounts) external;

    /**
     * @notice Change admin wallet that will receive funds to a new wallet address
     * @dev Must be called by tenant governance role
     * @param newWallet The new admin wallet
     */
    function setAdminWallet(address newWallet) external;

    /**
     * @notice Set vesting schedule
     * @dev Must be called by tenant contract admin role
     * @param startTimestamps Array specifying the start timestamps of each period
     * @param percentReleases Array specifying the percentage of grant amount to be released for each period
     * @param durationsDays Array specifying the duration in days of each period
     */
    function setVestingSchedule(
        uint256[] calldata startTimestamps,
        uint256[] calldata percentReleases,
        uint256[] calldata durationsDays
    ) external;

    /**
     * @notice Transfer unused tokens to the admin wallet
     * @dev Must be called by tenant contract admin role
     */
    function transferUnusedTokens() external;

    /**
     * @notice Unpause user functions
     * @dev Must be called by tenant contract admin role
     */
    function unpauseContract() external;

    /**
     * @notice Get whether multiple grant amounts is allowed to accumulate for the same user
     * @return Returns `true` if multiple grant amounts is allowed to accumulate for the same user,
     *                 `false` if a user can only have one grant
     */
    function allowAccumulate() external view returns (bool);

    /**
     * @notice Get maximum number of grants allowed per batch
     * @return Returns maximum number of grants allowed per batch
     */
    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function BATCH_MAX_NUM() external view returns (uint256); // solhint-disable-line func-name-mixedcase

    /**
     * @notice Get maximum number of schedule entries allowed
     * @return Returns maximum number of schedule entries allowed
     */
    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function SCHEDULE_MAX_ENTRIES() external view returns (uint256); // solhint-disable-line func-name-mixedcase

    /**
     * @notice Get effective grant amount for `account`
     * @param account The address to check
     * @return grantAmountWei The effective grant amount in wei for `account`
     */
    function effectiveGrantAmountFor(address account) external view returns (uint256 grantAmountWei);

    /**
     * @notice Get refund window
     * @return startTimestamp The start timestamp of refund window
     * @return durationSeconds The duration of refund window in seconds
     * @return endTimestamp The end timestamp of refund window
     */
    function getRefundWindow()
        external
        view
        returns (uint256 startTimestamp, uint256 durationSeconds, uint256 endTimestamp);

    /**
     * @notice Get vesting schedule
     * @param startTimestamps Array specifying the start timestamps of each period
     * @param percentReleases Array specifying the percentage of grant amount to be released for each period
     * @param durationsDays Array specifying the duration in days of each period
     * @param endTimestamps Array specifying the end timestamps of each period
     */
    function getVestingSchedule()
        external
        view
        returns (
            uint256[] memory startTimestamps,
            uint256[] memory percentReleases,
            uint256[] memory durationsDays,
            uint256[] memory endTimestamps
        );

    /**
     * @notice Check whether `account` has been refunded
     * @param account The address to check
     * @return hasRefunded `true` if `account` has been refunded
     */
    function hasRefundedFor(address account) external view returns (bool hasRefunded);

    /**
     * @notice Check whether `account` has claimed before
     * @param account The address to check
     * @return hasReleased `true` if `account` has claimed before
     */
    function hasReleasedFor(address account) external view returns (bool hasReleased);

    /**
     * @notice Check whether refund window already started at `atTimestamp`
     * @param atTimestamp The timestamp to check
     * @return hasStarted `true` if refund window already started at `atTimestamp`
     */
    function hasRefundWindowStarted(uint256 atTimestamp) external view returns (bool hasStarted);

    /**
     * @notice Check whether vesting schedule already started at `atTimestamp`
     * @param atTimestamp The timestamp to check
     * @return hasStarted `true` if vesting schedule already started at `atTimestamp`
     */
    function hasVestingScheduleStarted(uint256 atTimestamp) external view returns (bool hasStarted);

    /**
     * @notice Check whether refund window has been defined
     * @return isDefined `true` if refund window has been defined
     */
    function isRefundWindowDefined() external view returns (bool isDefined);

    /**
     * @notice Check whether refund window is open now
     * @return isOpen `true` if refund window is open now
     */
    function isRefundWindowOpenNow() external view returns (bool isOpen);

    /**
     * @notice Check whether vesting schedule has been defined
     * @return isDefined `true` if vesting schedule has been defined
     */
    function isVestingScheduleDefined() external view returns (bool isDefined);

    /**
     * @notice Get current number of schedule entries
     * @return Returns current number of schedule entries
     */
    function numVestingScheduleEntries() external view returns (uint256);

    /**
     * @notice Get refunded token amount for `account`
     * @param account The address to check
     * @return refundedAmount The token amount in wei that has been refunded to `account`
     */
    function refundedAmountFor(address account) external view returns (uint256 refundedAmount);

    /**
     * @notice Get releasable token amount for `account`
     * @param account The address to check
     * @return releasableAmount The token amount in wei that is releasable for `account`
     */
    function releasableAmountFor(address account) external view returns (uint256 releasableAmount);

    /**
     * @notice Get released token amount for `account`
     * @param account The address to check
     * @return releasedAmount The token amount in wei that has been released to `account`
     */
    function releasedAmountFor(address account) external view returns (uint256 releasedAmount);

    /**
     * @notice Check whether vesting grant for `account` has been revoked
     * @param account The address to check
     * @return isRevoked `true` if vesting grant for `account` has been revoked
     */
    function revoked(address account) external view returns (bool isRevoked);

    /**
     * @notice Get address of vesting token
     * @return Returns the address of vesting token
     */
    function tokenAddress() external view returns (address);

    /**
     * @notice Get the number of decimals for vesting token
     * @return Returns the number of decimals for vesting token
     */
    function tokenDecimals() external view returns (uint256);

    /**
     * @notice Get the total token amount of vesting grants
     * @return Returns the total token amount in wei of vesting grants
     */
    function totalGrantAmount() external view returns (uint256);

    /**
     * @notice Get the total token amount that has been refunded
     * @return Returns the total token amount in wei that has been refunded
     */
    function totalRefundAmount() external view returns (uint256);

    /**
     * @notice Get the total token amount that has been released
     * @return Returns the total token amount in wei that has been released
     */
    function totalReleasedAmount() external view returns (uint256);

    /**
     * @notice Get the total token amount that has been revoked
     * @return Returns the total token amount in wei that has been revoked
     */
    function totalRevokedAmount() external view returns (uint256);

    /**
     * @notice Get unvested token amount for `account`
     * @param account The address to check
     * @return unvestedAmount The token amount in wei that has not vested yet for `account`
     */
    function unvestedAmountFor(address account) external view returns (uint256 unvestedAmount);

    /**
     * @notice Get vested token amount for `account`
     * @param account The address to check
     * @return vestedAmount The token amount in wei that has vested for `account`
     */
    function vestedAmountFor(address account) external view returns (uint256 vestedAmount);

    /**
     * @notice Get vesting grant for`account`
     * @param account The address to check
     * @return grantAmount The vesting grant token amount in wei for `account`
     * @return isRevocable `true` if vesting grant for `account` can be revoked
     * @return isRevoked `true` if vesting grant for `account` has been revoked
     * @return isActive `true` if vesting grant for `account` is active
     */
    function vestingGrantFor(
        address account
    ) external view returns (uint256 grantAmount, bool isRevocable, bool isRevoked, bool isActive);
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {IVestingCustomRefund} from "./IVestingCustomRefund.sol";

/**
 * @title IVestingCustomRefundProject
 * @author Tim Loh
 * @notice Interface for custom vesting with refund for project
 */
interface IVestingCustomRefundProject is IVestingCustomRefund {
    /**
     * @notice Emitted when tokens have been refunded to `account`
     * @param account The address that received the refund
     * @param refundAmount The amount to be refunded to `account`
     */
    event TokensRefunded(address indexed account, uint256 refundAmount);

    /**
     * @notice Cancel refund window
     * @dev Must be called by contract usage role
     * @dev Can only cancel when refund window has not started yet
     */
    function cancelRefundWindow() external returns (bool isCancelled);

    /**
     * @notice Extend refund window
     * @dev Must be called by contract usage role
     * @dev Can only extend when refund window is open
     * @param newDurationSeconds New refund window duration in seconds
     */
    function extendRefundWindow(uint256 newDurationSeconds) external returns (bool isExtended);

    /**
     * @notice Refund specified amount of tokens to `account`
     * @dev Can only refund if vesting schedule is defined
     * @dev Can only refund when refund window is open
     * @dev Cannot refund if grant has been revoked
     * @param account The address to receive the refunded amount of tokens
     * @param amount The token amount in wei to be refunded to `account`
     */
    function refund(address account, uint256 amount) external returns (bool isRefunded);

    /**
     * @notice Set refund window
     * @dev Must be called by contract usage role
     * @dev Can only have one refund
     * @param startTimestamp Timestamp when refund window will start
     * @param durationSeconds Refund window duration in seconds
     */
    function setRefundWindow(uint256 startTimestamp, uint256 durationSeconds) external returns (bool isSet);

    /**
     * @notice Get contract usage role definition
     * @return Returns contract usage role definition
     */
    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function CONTRACT_USAGE_ROLE() external view returns (bytes32); // solhint-disable-line func-name-mixedcase

    /**
     * @notice Get interface ID for IVestingCustomRefundProject interface
     * @return Returns interface ID for IVestingCustomRefundProject interface
     */
    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function INTERFACE_ID() external view returns (bytes4); // solhint-disable-line func-name-mixedcase

    /**
     * @notice Get token amount that is refundable for `account`
     * @param account The address to check
     * @return refundableAmount The token amount in wei that is refundedable for `account`
     */
    function refundableAmountFor(address account) external view returns (uint256 refundableAmount);

    /**
     * @notice Checks whether this contract implements the interface defined by `interfaceId`
     * @dev ERC165
     * @return `true` if this contract implements the interface defined by `interfaceId`
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {IVestingCustomRefund} from "./IVestingCustomRefund.sol";

/**
 * @title IVestingCustomRefundUser
 * @author Tim Loh
 * @notice Interface for custom vesting with refund for user
 */
interface IVestingCustomRefundUser is IVestingCustomRefund {
    /**
     * @notice Emitted when payment received info has been removed
     * @param sender The address that removed the payment received info
     * @param paymentVestingAddress Address of payment token vesting contract
     * @param rate Number of weis one token costs in payment token
     */
    event PaymentReceivedInfoRemoved(address indexed sender, address paymentVestingAddress, uint256 rate);

    /**
     * @notice Emitted when payment received info has been set
     * @param sender The address that set the payment received info
     * @param paymentVestingAddress Address of payment token vesting contract
     * @param rate Number of weis one token costs in payment token
     */
    event PaymentReceivedInfoSet(address indexed sender, address paymentVestingAddress, uint256 rate);

    /**
     * @notice Emitted when tokens have been refunded for `account`
     * @param account The address that received the refund
     * @param refundTokenAmount The token amount in wei to be refunded for `account`
     * @param refundPaymentAmount The payment amount in wei to be transferred to `account`
     */
    event TokensRefunded(address indexed account, uint256 refundTokenAmount, uint256 refundPaymentAmount);

    /**
     * @notice Cancel refund window
     * @dev Must be called by backoffice contract admin role
     * @dev Can only cancel when refund window has not started yet
     * @dev Will cancel refund window on corresponding payment token vesting contract
     */
    function cancelRefundWindow() external;

    /**
     * @notice Extend refund window
     * @dev Must be called by backoffice contract admin role
     * @dev Can only extend when refund window is open
     * @dev Will extend refund window on corresponding payment token vesting contract
     * @dev Refund window must end before start of corresponding payment token vesting schedule
     * @param newDurationSeconds New refund window duration in seconds
     */
    function extendRefundWindow(uint256 newDurationSeconds) external;

    /**
     * @notice Refund refundable amount of tokens to sender
     * @dev Can only refund if vesting schedule is defined
     * @dev Can only refund when refund window is open
     * @dev Cannot refund if have previously refunded
     * @dev Cannot refund if have previously claimed
     * @dev Cannot refund if grant has been revoked
     * @dev Will refund payment token to sender from corresponding payment token vesting contract
     */
    function refund() external;

    /**
     * @notice Remove payment received info
     * @dev Must be called by backoffice contract admin role
     * @dev Cannot remove if refund window already started
     * @dev Will cancel refund window on corresponding payment token vesting contract if refund window is set in this
     *      contract
     */
    function removePaymentReceivedInfo() external;

    /**
     * @notice Set payment received info
     * @dev Must be called by backoffice contract admin role
     * @dev Cannot set if refund window already started
     * @dev Will set refund window on payment token vesting contract to be same as this vesting contract
     * @param paymentVestingAddress The address of custom vesting contract containing payment tokens received
     * @param rate How many weis one token costs in payment token
     */
    function setPaymentReceivedInfo(address paymentVestingAddress, uint256 rate) external;

    /**
     * @notice Set refund window
     * @dev Must be called by backoffice contract admin role
     * @dev Requires vesting schedule to be set
     * @dev Can only have one refund
     * @dev Will set refund window on corresponding payment token vesting contract
     * @dev Refund window must start at or after project token vesting schedule start
     * @dev Refund window must end before start of corresponding payment token vesting schedule
     * @param startTimestamp Timestamp when refund window will start
     * @param durationSeconds Refund window duration in seconds
     */
    function setRefundWindow(uint256 startTimestamp, uint256 durationSeconds) external;

    /**
     * @notice Get payment received info
     * @return paymentVestingAddress The address of custom vesting contract containing payment tokens received
     * @return rate How many weis one token costs in payment token
     */
    function getPaymentReceivedInfo() external view returns (address paymentVestingAddress, uint256 rate);

    /**
     * @notice Get token amount that is refundable for `account`
     * @param account The address to check
     * @return refundableAmount The token amount in wei that is refundedable for `account`
     */
    function refundableAmountFor(address account) external view returns (uint256 refundableAmount);
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

/**
 * @title UnitConverter
 * @author Tim Loh
 * @notice Converts given amount between Wei and number of decimal places
 */
library UnitConverter {
    uint256 public constant TOKEN_MAX_DECIMALS = 18;

    /**
     * @notice Scale down given amount in Wei to given number of decimal places
     * @param weiAmount Amount in Wei
     * @param decimals Number of decimal places
     * @return decimalsAmount Amount in Wei scaled down to given number of decimal places
     */
    // https://github.com/crytic/slither/wiki/Detector-Documentation#dead-code
    // slither-disable-next-line dead-code
    function scaleWeiToDecimals(uint256 weiAmount, uint256 decimals) internal pure returns (uint256 decimalsAmount) {
        require(decimals <= TOKEN_MAX_DECIMALS, "UnitConverter: decimals");

        if (decimals < TOKEN_MAX_DECIMALS && weiAmount > 0) {
            uint256 decimalsDiff = TOKEN_MAX_DECIMALS - decimals;
            decimalsAmount = weiAmount / 10 ** decimalsDiff;
        } else {
            decimalsAmount = weiAmount;
        }
    }

    /**
     * @notice Scale up given amount in given number of decimal places to Wei
     * @param decimalsAmount Amount in number of decimal places
     * @param decimals Number of decimal places
     * @return weiAmount Amount in given number of decimal places scaled up to Wei
     */
    // https://github.com/crytic/slither/wiki/Detector-Documentation#dead-code
    // slither-disable-next-line dead-code
    function scaleDecimalsToWei(uint256 decimalsAmount, uint256 decimals) internal pure returns (uint256 weiAmount) {
        require(decimals <= TOKEN_MAX_DECIMALS, "UnitConverter: decimals");

        if (decimals < TOKEN_MAX_DECIMALS && decimalsAmount > 0) {
            uint256 decimalsDiff = TOKEN_MAX_DECIMALS - decimals;
            weiAmount = decimalsAmount * 10 ** decimalsDiff;
        } else {
            weiAmount = decimalsAmount;
        }
    }
}

// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 Enjinstarter
pragma solidity 0.8.19;

import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import {Pausable} from "@openzeppelin/contracts/security/Pausable.sol";
import {IERC20, SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {UnitConverter} from "./libraries/UnitConverter.sol";
import {AdminPrivileges} from "./AdminPrivileges.sol";
import {AdminWallet} from "./AdminWallet.sol";
import {IFactoryImplementation} from "./interfaces/IFactoryImplementation.sol";
import {IVestingCustomRefund} from "./interfaces/IVestingCustomRefund.sol";

/**
 * @title VestingCustomRefund
 * @author Tim Loh
 * @notice Provides an implementation of custom vesting with refund interface
 */
contract VestingCustomRefund is Initializable, Pausable, AdminPrivileges, AdminWallet, IVestingCustomRefund {
    using SafeERC20 for IERC20;
    using UnitConverter for uint256;

    struct CustomVestingScheduleEntry {
        uint256 percentRelease; // Percentage of grant amount to be released for period
        uint256 startTimestamp; // Start timestamp of period
        uint256 durationDays; // Duration in days for period
        uint256 endTimestamp; // End timestamp of period
    }

    struct RefundWindow {
        uint256 startTimestamp; // Start timestamp of refund window
        uint256 durationSeconds; // Duration of refund window in seconds
        uint256 endTimestamp; // End timestamp of refund window
    }

    struct VestingGrant {
        uint256 grantAmount; // Total number of tokens granted in wei
        // `true` if vesting grant can be revoked (e.g. gift), // `false` if cannot be revoked (e.g. purchased)
        bool isRevocable;
        bool isRevoked; // `true` if vesting grant has been revoked
        bool isActive; // `true` if vesting grant is active
    }

    uint256 public constant BATCH_MAX_NUM = 100;
    uint256 public constant SCHEDULE_MAX_ENTRIES = 100;

    uint256 public constant PERCENT_100_WEI = 100 ether;
    uint256 public constant SECONDS_IN_DAY = 86400;
    uint256 public constant TOKEN_MAX_DECIMALS = 18;

    bool public allowAccumulate;
    uint256 public numVestingScheduleEntries;
    address public tokenAddress;
    uint256 public tokenDecimals;
    uint256 public totalGrantAmount;
    uint256 public totalRefundAmount;
    uint256 public totalReleasedAmount;
    uint256 public totalRevokedAmount;

    RefundWindow private _refundWindow;

    mapping(address => uint256) private _refunded;
    mapping(address => uint256) private _released;
    mapping(address => VestingGrant) private _vestingGrants;
    mapping(uint256 => CustomVestingScheduleEntry) private _vestingSchedule;

    constructor() {
        _disableInitializers();
    }

    /**
     * @param tokenAddress_ The address of vesting token
     * @param tokenDecimals_ The number of decimals for vesting token
     * @param allowAccumulate_ `true` if multiple grant amounts is allowed to accumulate for the same user,
     *                         `false` if a user can only have one grant
     * @param backofficeAdminAddress The address that will be assigned the backoffice role admin role and backoffice
     *                               contract admin role
     * @param tenantAdminAddress The address that will be assigned the tenant role admin role, tenant governance role
     *                           and tenant contract admin role
     */
    function initialize(
        address tokenAddress_,
        uint256 tokenDecimals_,
        bool allowAccumulate_,
        address backofficeAdminAddress,
        address tenantAdminAddress
    ) public virtual initializer {
        __VestingCustomRefund_init(
            tokenAddress_,
            tokenDecimals_,
            allowAccumulate_,
            backofficeAdminAddress,
            tenantAdminAddress
        );
    }

    // https://github.com/crytic/slither/wiki/Detector-Documentation#dead-code
    // slither-disable-start dead-code

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function __VestingCustomRefund_init(
        // solhint-disable-previous-line func-name-mixedcase
        address tokenAddress_,
        uint256 tokenDecimals_,
        bool allowAccumulate_,
        address backofficeAdminAddress,
        address tenantAdminAddress
    ) internal onlyInitializing {
        __VestingCustomRefund_init_unchained(
            tokenAddress_,
            tokenDecimals_,
            allowAccumulate_,
            backofficeAdminAddress,
            tenantAdminAddress
        );
    }

    // slither-disable-end dead-code

    // https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions
    // slither-disable-next-line naming-convention
    function __VestingCustomRefund_init_unchained(
        // solhint-disable-previous-line func-name-mixedcase
        address tokenAddress_,
        uint256 tokenDecimals_,
        bool allowAccumulate_,
        address backofficeAdminAddress,
        address tenantAdminAddress
    ) internal onlyInitializing {
        require(tokenAddress_ != address(0), "VCR: token address");
        require(tokenDecimals_ <= TOKEN_MAX_DECIMALS, "VCR: token decimals");
        require(backofficeAdminAddress != address(0), "VCR: backoffice admin");
        require(tenantAdminAddress != address(0), "VCR: tenant admin");

        _setRoleAdmin(BACKOFFICE_ROLE_ADMIN_ROLE, BACKOFFICE_ROLE_ADMIN_ROLE);
        _setRoleAdmin(BACKOFFICE_CONTRACT_ADMIN_ROLE, BACKOFFICE_ROLE_ADMIN_ROLE);
        _setRoleAdmin(TENANT_ROLE_ADMIN_ROLE, TENANT_ROLE_ADMIN_ROLE);
        _setRoleAdmin(TENANT_GOVERNANCE_ROLE, TENANT_ROLE_ADMIN_ROLE);
        _setRoleAdmin(TENANT_CONTRACT_ADMIN_ROLE, TENANT_ROLE_ADMIN_ROLE);

        _grantRole(BACKOFFICE_ROLE_ADMIN_ROLE, backofficeAdminAddress);
        _grantRole(BACKOFFICE_CONTRACT_ADMIN_ROLE, backofficeAdminAddress);

        _grantRole(TENANT_ROLE_ADMIN_ROLE, tenantAdminAddress);
        _grantRole(TENANT_GOVERNANCE_ROLE, tenantAdminAddress);
        _grantRole(TENANT_CONTRACT_ADMIN_ROLE, tenantAdminAddress);

        _setAdminWallet(tenantAdminAddress);

        tokenAddress = tokenAddress_;
        tokenDecimals = tokenDecimals_;

        allowAccumulate = allowAccumulate_;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function addVestingGrant(
        // solhint-disable-previous-line ordering
        address account,
        uint256 grantAmount,
        bool isRevocable
    ) external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        _addVestingGrant(account, grantAmount, isRevocable);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function addVestingGrantsBatch(
        address[] memory accounts,
        uint256[] memory grantAmounts,
        bool[] memory isRevocables
    ) external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        require(accounts.length > 0, "VCR: empty");
        require(accounts.length <= BATCH_MAX_NUM, "VCR: exceed max");
        require(grantAmounts.length == accounts.length, "VCR: grant amounts length");
        require(isRevocables.length == accounts.length, "VCR: is revocables length");

        for (uint256 i = 0; i < accounts.length; i++) {
            _addVestingGrant(accounts[i], grantAmounts[i], isRevocables[i]);
        }
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function pauseContract() external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        _pause();
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function release() external virtual override whenNotPaused {
        uint256 releasableAmount = releasableAmountFor(msg.sender);

        _release(msg.sender, releasableAmount);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function revokeVestingGrant(address account) external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        _revokeVestingGrant(account);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function revokeVestingGrantsBatch(
        address[] memory accounts
    ) external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        require(accounts.length > 0, "VCR: empty");
        require(accounts.length <= BATCH_MAX_NUM, "VCR: exceed max");

        for (uint256 i = 0; i < accounts.length; i++) {
            _revokeVestingGrant(accounts[i]);
        }
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function setAdminWallet(address newWallet) external virtual override onlyRole(TENANT_GOVERNANCE_ROLE) {
        _setAdminWallet(newWallet);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function setVestingSchedule(
        uint256[] calldata startTimestamps,
        uint256[] calldata percentReleases,
        uint256[] calldata durationsDays
    ) external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        require(startTimestamps.length > 0, "VCR: empty");
        require(startTimestamps.length <= SCHEDULE_MAX_ENTRIES, "VCR: exceed max");
        require(percentReleases.length == startTimestamps.length, "VCR: percent length different");
        require(durationsDays.length == startTimestamps.length, "VCR: duration length different");
        require(!hasVestingScheduleStarted(block.timestamp), "VCR: already started");

        uint256 minTimestamp = block.timestamp;
        uint256 totalPercentRelease = 0;

        for (uint256 i = 0; i < startTimestamps.length; i++) {
            require(percentReleases[i] > 0, "VCR: zero percent");
            require(startTimestamps[i] >= minTimestamp, "VCR: invalid start timestamp");

            totalPercentRelease = totalPercentRelease + percentReleases[i];
            require(totalPercentRelease <= PERCENT_100_WEI, "VCR: exceed 100%");

            if (durationsDays[i] > 0) {
                minTimestamp = startTimestamps[i] + durationsDays[i] * SECONDS_IN_DAY;
            } else {
                minTimestamp = startTimestamps[i];
            }

            _vestingSchedule[i] = CustomVestingScheduleEntry({
                percentRelease: percentReleases[i],
                startTimestamp: startTimestamps[i],
                durationDays: durationsDays[i],
                endTimestamp: minTimestamp
            });
        }

        require(totalPercentRelease == PERCENT_100_WEI, "VCR: not 100%");

        numVestingScheduleEntries = startTimestamps.length;

        emit ScheduleSet(msg.sender, startTimestamps, percentReleases, durationsDays);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function transferUnusedTokens() external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        uint256 balanceInDecimals = IERC20(tokenAddress).balanceOf(address(this));
        uint256 balanceInWei = balanceInDecimals.scaleDecimalsToWei(tokenDecimals);

        uint256 unusedAmount = balanceInWei +
            totalReleasedAmount +
            totalRevokedAmount +
            totalRefundAmount -
            totalGrantAmount;
        require(unusedAmount > 0, "VCR: nothing to transfer");

        uint256 transferAmount = unusedAmount.scaleWeiToDecimals(tokenDecimals);

        emit UnusedTokensTransferred(
            msg.sender,
            unusedAmount,
            balanceInWei,
            totalReleasedAmount,
            totalRevokedAmount,
            totalRefundAmount,
            totalGrantAmount
        );

        IERC20(tokenAddress).safeTransfer(adminWallet(), transferAmount);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function unpauseContract() external virtual override onlyRole(TENANT_CONTRACT_ADMIN_ROLE) {
        _unpause();
    }

    /**
     * @inheritdoc IFactoryImplementation
     */
    function factoryImplementationType() external view virtual override returns (uint256 implementationType) {
        implementationType = 0x447e1a635045d08b78677dfba2a78564b566f402520e983a9ae65e8115b13d5b;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function getVestingSchedule()
        external
        view
        virtual
        override
        returns (
            uint256[] memory startTimestamps,
            uint256[] memory percentReleases,
            uint256[] memory durationsDays,
            uint256[] memory endTimestamps
        )
    {
        startTimestamps = new uint256[](numVestingScheduleEntries);
        percentReleases = new uint256[](numVestingScheduleEntries);
        durationsDays = new uint256[](numVestingScheduleEntries);
        endTimestamps = new uint256[](numVestingScheduleEntries);

        if (numVestingScheduleEntries > 0) {
            for (uint256 i = 0; i < numVestingScheduleEntries; i++) {
                startTimestamps[i] = _vestingSchedule[i].startTimestamp;
                percentReleases[i] = _vestingSchedule[i].percentRelease;
                durationsDays[i] = _vestingSchedule[i].durationDays;
                endTimestamps[i] = _vestingSchedule[i].endTimestamp;
            }
        }
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function unvestedAmountFor(address account) external view virtual override returns (uint256 unvestedAmount) {
        require(account != address(0), "VCR: zero account");

        if (revoked(account)) {
            unvestedAmount = 0;
            return unvestedAmount;
        }

        uint256 grantAmountWei = effectiveGrantAmountFor(account);
        uint256 vestedAmountWei = vestedAmountFor(account);

        unvestedAmount = grantAmountWei - vestedAmountWei;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function effectiveGrantAmountFor(address account) public view virtual override returns (uint256 grantAmountWei) {
        require(account != address(0), "VCR: zero account");

        VestingGrant memory vestingGrant = _vestingGrants[account];
        require(vestingGrant.isActive, "VCR: inactive");

        uint256 refundedAmount = refundedAmountFor(account);

        grantAmountWei = vestingGrant.grantAmount - refundedAmount;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function getRefundWindow()
        public
        view
        virtual
        override
        returns (uint256 startTimestamp, uint256 durationSeconds, uint256 endTimestamp)
    {
        startTimestamp = _refundWindow.startTimestamp;
        durationSeconds = _refundWindow.durationSeconds;
        endTimestamp = _refundWindow.endTimestamp;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function hasRefundedFor(address account) public view virtual override returns (bool hasRefunded) {
        require(account != address(0), "VCR: zero account");
        require(_vestingGrants[account].isActive, "VCR: inactive");

        hasRefunded = refundedAmountFor(account) > 0;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function hasReleasedFor(address account) public view virtual override returns (bool hasReleased) {
        require(account != address(0), "VCR: zero account");
        require(_vestingGrants[account].isActive, "VCR: inactive");

        hasReleased = releasedAmountFor(account) > 0;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function hasRefundWindowStarted(uint256 atTimestamp) public view virtual override returns (bool hasStarted) {
        require(atTimestamp > 0, "VCR: timestamp");

        hasStarted = _refundWindow.startTimestamp > 0 && atTimestamp >= _refundWindow.startTimestamp;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function hasVestingScheduleStarted(uint256 atTimestamp) public view virtual override returns (bool hasStarted) {
        require(atTimestamp > 0, "VCR: timestamp");

        hasStarted = numVestingScheduleEntries > 0 && atTimestamp >= _vestingSchedule[0].startTimestamp;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function isRefundWindowDefined() public view virtual override returns (bool isDefined) {
        isDefined = _refundWindow.startTimestamp > 0;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function isRefundWindowOpenNow() public view virtual override returns (bool isOpen) {
        isOpen =
            _refundWindow.startTimestamp > 0 &&
            _refundWindow.endTimestamp > 0 &&
            block.timestamp >= _refundWindow.startTimestamp &&
            block.timestamp < _refundWindow.endTimestamp;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function isVestingScheduleDefined() public view virtual override returns (bool isDefined) {
        isDefined = numVestingScheduleEntries > 0;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function refundedAmountFor(address account) public view virtual override returns (uint256 refundedAmount) {
        require(account != address(0), "VCR: zero account");

        refundedAmount = _refunded[account];
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function releasableAmountFor(address account) public view virtual override returns (uint256 releasableAmount) {
        require(account != address(0), "VCR: zero account");
        require(hasVestingScheduleStarted(block.timestamp), "VCR: not started");
        require(!revoked(account), "VCR: revoked");

        releasableAmount = vestedAmountFor(account) - releasedAmountFor(account);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function releasedAmountFor(address account) public view virtual override returns (uint256 releasedAmount) {
        require(account != address(0), "VCR: zero account");

        releasedAmount = _released[account];
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function revoked(address account) public view virtual override returns (bool isRevoked) {
        require(account != address(0), "VCR: zero account");

        VestingGrant memory vestingGrant = _vestingGrants[account];
        require(vestingGrant.isActive, "VCR: inactive");

        isRevoked = vestingGrant.isRevoked;
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function vestedAmountFor(address account) public view virtual override returns (uint256 vestedAmount) {
        require(account != address(0), "VCR: zero account");

        if (numVestingScheduleEntries == 0 || _vestingSchedule[0].startTimestamp == 0) {
            return 0;
        }

        if (block.timestamp < _vestingSchedule[0].startTimestamp) {
            return 0;
        }

        if (revoked(account)) {
            return releasedAmountFor(account);
        }

        uint256 grantAmountWei = effectiveGrantAmountFor(account);

        if (block.timestamp >= _vestingSchedule[numVestingScheduleEntries - 1].endTimestamp) {
            return grantAmountWei;
        }

        uint256 totalPercentRelease = _getTotalPercentRelease(block.timestamp);

        // https://github.com/crytic/slither/wiki/Detector-Documentation#divide-before-multiply
        // slither-disable-next-line divide-before-multiply
        uint256 totalReleaseAmount = (grantAmountWei * totalPercentRelease) / PERCENT_100_WEI;
        vestedAmount = totalReleaseAmount.scaleWeiToDecimals(tokenDecimals).scaleDecimalsToWei(tokenDecimals);
    }

    /**
     * @inheritdoc IVestingCustomRefund
     */
    function vestingGrantFor(
        address account
    ) public view virtual override returns (uint256 grantAmount, bool isRevocable, bool isRevoked, bool isActive) {
        require(account != address(0), "VCR: zero account");

        VestingGrant memory vestingGrant = _vestingGrants[account];
        grantAmount = vestingGrant.grantAmount;
        isRevocable = vestingGrant.isRevocable;
        isRevoked = vestingGrant.isRevoked;
        isActive = vestingGrant.isActive;
    }

    /**
     * @notice Add vesting grant for `account`
     * @dev grant can only be added before schedule start
     * @dev grant cannot be added if previous grant has been revoked
     * @dev isRevocable will be ignored if grant already added but amount allowed to accumulate
     * @param account The address that will have the vesting grant added
     * @param grantAmount The grant token amount in wei
     * @param isRevocable `true` if vesting grant is revocable
     *                    `false` if vesting grant is not revocable
     */
    function _addVestingGrant(address account, uint256 grantAmount, bool isRevocable) internal virtual {
        require(account != address(0), "VCR: zero account");
        require(grantAmount > 0, "VCR: zero grant amount");
        require(!hasVestingScheduleStarted(block.timestamp), "VCR: already started");

        VestingGrant memory vestingGrant = _vestingGrants[account];
        require(allowAccumulate || !vestingGrant.isActive, "VCR: already added");
        require(!vestingGrant.isActive || !revoked(account), "VCR: already revoked");

        uint256 truncatedGrantAmount = grantAmount.scaleWeiToDecimals(tokenDecimals).scaleDecimalsToWei(tokenDecimals);
        require(truncatedGrantAmount > 0, "VCR: zero decimals grant amount");

        // https://github.com/crytic/slither/wiki/Detector-Documentation#costly-operations-inside-a-loop
        // slither-disable-next-line costly-loop
        totalGrantAmount += truncatedGrantAmount;
        // https://github.com/crytic/slither/wiki/Detector-Documentation/#calls-inside-a-loop
        // slither-disable-next-line calls-loop
        uint256 balanceInDecimals = IERC20(tokenAddress).balanceOf(address(this));
        require(balanceInDecimals > 0, "VCR: zero balance");
        uint256 balanceInWei = balanceInDecimals.scaleDecimalsToWei(tokenDecimals);

        uint256 remainderAmount = balanceInWei +
            totalReleasedAmount +
            totalRevokedAmount +
            totalRefundAmount;
        require(remainderAmount >= totalGrantAmount, "VCR: total grant > remainder");

        if (vestingGrant.isActive) {
            _vestingGrants[account].grantAmount = vestingGrant.grantAmount + truncatedGrantAmount;
            // _vestingGrants[account].isRevocable = isRevocable;
        } else {
            _vestingGrants[account] = VestingGrant({
                grantAmount: truncatedGrantAmount,
                isRevocable: isRevocable,
                isRevoked: false,
                isActive: true
            });
        }

        emit VestingGrantAdded(account, truncatedGrantAmount, isRevocable);
    }

    /**
     * @notice Cancel refund window
     * @dev Can only cancel when refund window has not started yet
     */
    function _cancelRefundWindow() internal virtual {
        require(isRefundWindowDefined(), "VCR: no refund");
        require(!hasRefundWindowStarted(block.timestamp), "VCR: refund started");

        uint256 oldStartTimestamp = _refundWindow.startTimestamp;
        uint256 oldDurationSeconds = _refundWindow.durationSeconds;
        uint256 oldEndTimestamp = _refundWindow.endTimestamp;

        _refundWindow.startTimestamp = 0;
        _refundWindow.durationSeconds = 0;
        _refundWindow.endTimestamp = 0;

        emit RefundWindowCancelled(msg.sender, oldStartTimestamp, oldDurationSeconds, oldEndTimestamp);
    }

    /**
     * @notice Extend refund window
     * @dev Can only extend when refund window is open
     * @param newDurationSeconds New refund window duration in seconds
     */
    function _extendRefundWindow(uint256 newDurationSeconds) internal virtual {
        require(newDurationSeconds > 0, "VCR: new duration");
        require(isRefundWindowOpenNow(), "VCR: not open");

        uint256 oldEndTimestamp = _refundWindow.endTimestamp;
        uint256 newEndTimestamp = _refundWindow.startTimestamp + newDurationSeconds;
        require(newEndTimestamp > oldEndTimestamp, "VCR: too short");

        uint256 oldDurationSeconds = _refundWindow.durationSeconds;

        _refundWindow.durationSeconds = newDurationSeconds;
        _refundWindow.endTimestamp = newEndTimestamp;

        emit RefundWindowExtended(msg.sender, newDurationSeconds, newEndTimestamp, oldDurationSeconds, oldEndTimestamp);
    }

    /**
     * @notice Refund specified amount of tokens to `account`
     * @dev Can only refund when refund window is open
     * @dev Cannot refund if have previously refunded
     * @dev Cannot refund if have previously claimed
     * @param account The address to receive the refunded amount of tokens
     * @param amount The token amount in wei to be refunded to `account`
     */
    function _refund(address account, uint256 amount) internal virtual {
        require(account != address(0), "VCR: zero account");
        require(amount > 0, "VCR: zero amount");
        require(isRefundWindowOpenNow(), "VCR: not open");

        _refunded[account] += amount;
        totalRefundAmount += amount;
    }

    /**
     * @notice Release specified amount of tokens to `account`
     * @param account The address to receive the specified amount of tokens
     * @param amount The token amount in wei to be transferred to `account`
     */
    function _release(address account, uint256 amount) internal virtual {
        require(account != address(0), "VCR: zero account");
        require(amount > 0, "VCR: zero amount");

        uint256 transferDecimalsAmount = amount.scaleWeiToDecimals(tokenDecimals);
        uint256 transferWeiAmount = transferDecimalsAmount.scaleDecimalsToWei(tokenDecimals);

        _released[account] += transferWeiAmount;
        totalReleasedAmount += transferWeiAmount;

        emit TokensReleased(account, transferWeiAmount);

        IERC20(tokenAddress).safeTransfer(account, transferDecimalsAmount);
    }

    /**
     * @notice Revoke vesting grant for `account`
     * @dev Only revocable grants can be revoked
     * @param account The address that will have the vesting grant revoked
     */
    function _revokeVestingGrant(address account) internal virtual {
        require(account != address(0), "VCR: zero account");

        VestingGrant memory vestingGrant = _vestingGrants[account];
        require(vestingGrant.isActive, "VCR: inactive");
        require(vestingGrant.isRevocable, "VCR: not revocable");
        require(!revoked(account), "VCR: already revoked");

        uint256 refundedAmount = refundedAmountFor(account);
        uint256 releasedAmount = releasedAmountFor(account);
        uint256 remainderAmount = vestingGrant.grantAmount - refundedAmount - releasedAmount;
        // https://github.com/crytic/slither/wiki/Detector-Documentation#costly-operations-inside-a-loop
        // slither-disable-next-line costly-loop
        totalRevokedAmount += remainderAmount;
        _vestingGrants[account].isRevoked = true;

        emit VestingGrantRevoked(account, remainderAmount, vestingGrant.grantAmount, refundedAmount, releasedAmount);
    }

    /**
     * @notice Set refund window
     * @dev Can only have one refund
     * @param startTimestamp Timestamp when refund window will start
     * @param durationSeconds Refund window duration in seconds
     */
    function _setRefundWindow(uint256 startTimestamp, uint256 durationSeconds) internal virtual {
        require(startTimestamp > 0, "VCR: start timestamp");
        require(durationSeconds > 0, "VCR: duration");
        require(!hasRefundWindowStarted(block.timestamp), "VCR: refund started");

        uint256 endTimestamp = startTimestamp + durationSeconds;

        _refundWindow.startTimestamp = startTimestamp;
        _refundWindow.durationSeconds = durationSeconds;
        _refundWindow.endTimestamp = endTimestamp;

        emit RefundWindowSet(msg.sender, startTimestamp, durationSeconds, endTimestamp);
    }

    /**
     * @notice Get total percentage to be released at specified timestamp
     * @param atTimestamp Specified timestamp
     * @return totalPercentRelease The total percentage to be released at specified timestamp
     */
    function _getTotalPercentRelease(uint256 atTimestamp) internal view virtual returns (uint256 totalPercentRelease) {
        totalPercentRelease = 0;

        for (uint256 i = 0; i < numVestingScheduleEntries; i++) {
            if (atTimestamp < _vestingSchedule[i].startTimestamp) {
                break;
            }

            if (atTimestamp >= _vestingSchedule[i].endTimestamp) {
                totalPercentRelease += _vestingSchedule[i].percentRelease;
            } else {
                uint256 durationSeconds = _vestingSchedule[i].durationDays * SECONDS_IN_DAY;
                uint256 percentRelease = (atTimestamp - _vestingSchedule[i].startTimestamp) *
                    _vestingSchedule[i].percentRelease;

                // https://github.com/crytic/slither/wiki/Detector-Documentation#divide-before-multiply
                // slither-disable-next-line divide-before-multiply
                totalPercentRelease = (totalPercentRelease * durationSeconds + percentRelease) / durationSeconds;
                break;
            }
        }
    }

    /**
     * @notice Get token amount that is refundable for `account`
     * @param account The address to check
     * @return refundableAmount The token amount in wei that is refundedable for `account`
     */
    function _refundableAmountFor(address account) internal view virtual returns (uint256 refundableAmount) {
        require(account != address(0), "VCR: zero account");
        require(isVestingScheduleDefined(), "VCR: undefined schedule");
        require(!revoked(account), "VCR: revoked");

        VestingGrant memory vestingGrant = _vestingGrants[account];
        // require(vestingGrant.isActive, "VCR: inactive"); // already checked in revoked()

        refundableAmount = hasRefundedFor(account) || releasedAmountFor(account) > 0 ? 0 : vestingGrant.grantAmount;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
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