// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.17;

import { IStream } from "./IStream.sol";
import { Clone } from "solady/utils/Clone.sol";
import { IERC20 } from "openzeppelin-contracts/interfaces/IERC20.sol";
import { SafeERC20 } from "openzeppelin-contracts/token/ERC20/utils/SafeERC20.sol";
import { Math } from "openzeppelin-contracts/utils/math/Math.sol";

/**
 * @title Stream
 * @notice Allows a payer to pay a recipient an amount of tokens over time, at a regular rate per second.
 * Once the stream begins vested tokens can be withdrawn at any time.
 * Either party can choose to cancel, in which case the stream distributes each party's fair share of tokens.
 * @dev A fork of Sablier https://github.com/sablierhq/sablier/blob/%40sablier/protocol%401.1.0/packages/protocol/contracts/Sablier.sol.
 * Inherits from `Clone`, which allows Stream to read immutable arguments from its code section rather than state, resulting
 * in significant gas savings for users.
 */
contract Stream is IStream, Clone {
    using SafeERC20 for IERC20;

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   ERRORS
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    error OnlyFactory();
    error CantWithdrawZero();
    error AmountExceedsBalance();
    error CallerNotPayerOrRecipient();
    error CallerNotPayer();
    error RescueTokenAmountExceedsExcessBalance();
    error StreamNotActive();
    error ETHRescueFailed();

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   EVENTS
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /// @dev msgSender is part of the event to enable event indexing with which account performed this action.
    event TokensWithdrawn(address indexed msgSender, address indexed recipient, uint256 amount);

    /// @dev msgSender is part of the event to enable event indexing with which account performed this action.
    event StreamCancelled(
        address indexed msgSender,
        address indexed payer,
        address indexed recipient,
        uint256 recipientBalance
    );

    /// @notice Emitted when payer recovers excess stream payment tokens, or other ERC20 tokens accidentally sent to this stream
    event TokensRecovered(address indexed payer, address tokenAddress, uint256 amount, address to);

    /// @notice Emitted when recovering ETH accidentally sent to this stream
    event ETHRescued(address indexed payer, address indexed to, uint256 amount);

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   IMMUTABLES
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @notice Get the address of the factory contract that cloned this Stream instance.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function factory() public pure returns (address) {
        return _getArgAddress(0);
    }

    /**
     * @notice Get this stream's payer address.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function payer() public pure returns (address) {
        return _getArgAddress(20);
    }

    /**
     * @notice Get this stream's recipient address.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function recipient() public pure returns (address) {
        return _getArgAddress(40);
    }

    /**
     * @notice Get this stream's total token amount.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function tokenAmount() public pure returns (uint256) {
        return _getArgUint256(60);
    }

    /**
     * @notice Get this stream's ERC20 token.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function token() public pure returns (IERC20) {
        return IERC20(_getArgAddress(92));
    }

    /**
     * @notice Get this stream's start timestamp in seconds.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function startTime() public pure returns (uint256) {
        return _getArgUint256(112);
    }

    /**
     * @notice Get this stream's end timestamp in seconds.
     * @dev Uses clone-with-immutable-args to read the value from the contract's code region rather than state to save gas.
     */
    function stopTime() public pure returns (uint256) {
        return _getArgUint256(144);
    }

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   STORAGE VARIABLES
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @notice The maximum token balance remaining in the stream when taking withdrawals into account.
     * Should be equal to the stream's token balance once fully funded.
     * @dev using remaining balance rather than a growing sum of withdrawals for gas optimization reasons.
     * This approach warms up this slot upon stream creation, so that withdrawals cost less gas.
     * If this were the sum of withdrawals, recipient would pay 20K extra gas on their first withdrawal.
     */
    uint256 public remainingBalance;

    /**
     * @notice The recipient's balance once the stream is cancelled. It is set to the recipient's balance
     * at the moment of cancellation, and is decremented when recipient withdraws post-cancellation.
     * @dev It's assumed to be zero as long as the stream has not been cancelled.
     */
    uint256 public recipientCancelBalance;

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   MODIFIERS
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @dev Reverts if the caller is not the payer or the recipient of the stream.
     */
    modifier onlyPayerOrRecipient() {
        if (msg.sender != recipient() && msg.sender != payer()) {
            revert CallerNotPayerOrRecipient();
        }

        _;
    }

    /**
     * @dev Reverts if the caller is not the payer of the stream.
     */
    modifier onlyPayer() {
        if (msg.sender != payer()) {
            revert CallerNotPayer();
        }

        _;
    }

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   INITIALIZER
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @dev Limiting calls to factory only to prevent abuse. This approach is more gas efficient than using
     * OpenZeppelin's Initializable since we avoid the storage writes that entails.
     * This does create the possibility for the factory to initialize the same stream twice; this risk seems low
     * and worth the gas savings.
     */
    function initialize() external {
        if (msg.sender != factory()) revert OnlyFactory();

        remainingBalance = tokenAmount();
    }

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   EXTERNAL TXS
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @notice Withdraw tokens to recipient's account.
     * Execution fails if the requested amount is greater than recipient's withdrawable balance.
     * Only this stream's payer or recipient can call this function.
     * @param amount the amount of tokens to withdraw.
     */
    function withdrawFromActiveBalance(uint256 amount) public onlyPayerOrRecipient {
        if (amount == 0) revert CantWithdrawZero();
        address recipient_ = recipient();

        uint256 balance = recipientActiveBalance();
        if (balance < amount) revert AmountExceedsBalance();

        // This is safe because it should always be the case that:
        // remainingBalance >= balance >= amount.
        unchecked {
            remainingBalance = remainingBalance - amount;
        }

        token().safeTransfer(recipient_, amount);
        emit TokensWithdrawn(msg.sender, recipient_, amount);
    }

    /**
     * @notice Cancel the stream and update recipient's fair share of the funds to their current balance.
     * Each party must take additional action to withdraw their funds:
     * recipient must call `withdrawAfterCancel`.
     * payer must call `recoverTokens`.
     * Only this stream's payer or recipient can call this function.
     * Reverts if executed after recipient has withdrawn the full stream amount, or if executed more than once.
     */
    function cancel() external onlyPayerOrRecipient {
        address payer_ = payer();
        address recipient_ = recipient();

        if (remainingBalance == 0) revert StreamNotActive();

        uint256 recipientActiveBalance_ = recipientActiveBalance();

        // This token amount is available to recipient to withdraw via `withdrawAfterCancel`.
        recipientCancelBalance = recipientActiveBalance_;

        // This zeroing is important because without it, it's possible for recipient to obtain additional funds
        // from this contract if anyone (e.g. payer) sends it tokens after cancellation.
        // Thanks to this state update, `balanceOf(recipient_)` will only return zero in future calls.
        remainingBalance = 0;

        emit StreamCancelled(msg.sender, payer_, recipient_, recipientActiveBalance_);
    }

    /**
     * @notice Withdraw tokens to recipient's account after the stream has been cancelled.
     * Execution fails if the requested amount is greater than recipient's withdrawable balance.
     * Only this stream's payer or recipient can call this function.
     * @param amount the amount of tokens to withdraw.
     */
    function withdrawAfterCancel(uint256 amount) public onlyPayerOrRecipient {
        if (amount == 0) revert CantWithdrawZero();
        address recipient_ = recipient();

        // Reverts if amount > recipientCancelBalance
        recipientCancelBalance -= amount;
        token().safeTransfer(recipient_, amount);

        emit TokensWithdrawn(msg.sender, recipient_, amount);
    }

    /**
     * @notice Withdraw tokens to recipients's account. Works for both active and cancelled streams.
     * @param amount the amount of tokens to withdraw
     * @dev reverts if msg.sender is not the payer or the recipient
     */
    function withdraw(uint256 amount) external {
        if (recipientCancelBalance > 0) {
            withdrawAfterCancel(amount);
        } else {
            withdrawFromActiveBalance(amount);
        }
    }

    /**
     * @notice Recover excess stream payment tokens, or other ERC20 tokens accidentally sent to this stream.
     * When a stream is cancelled payer uses this function to recover their fair share of tokens.
     * Reverts when trying to recover stream's payment token at an amount that exceeds
     * the excess token balance; any rescue should always leave sufficient tokens to
     * fully pay recipient.
     * Reverts when msg.sender is not this stream's payer.
     * @dev Checking token balance before and after to defend against the case of multiple contracts
     * updating the balance of the same token.
     * @param tokenAddress the contract address of the token to recover.
     * @param to the address to send the tokens to
     * @param amount the amount to recover.
     */
    function recoverTokens(address tokenAddress, uint256 amount, address to) public onlyPayer {
        // When the stream is under-funded, it should keep its current balance
        // When it's sufficiently-funded, it should keep the full balance committed to recipient
        // i.e. `remainingBalance` or `recipientCancelBalance`
        uint256 requiredBalanceAfter =
            Math.min(tokenBalance(), Math.max(remainingBalance, recipientCancelBalance));

        IERC20(tokenAddress).safeTransfer(to, amount);

        if (tokenBalance() < requiredBalanceAfter) revert RescueTokenAmountExceedsExcessBalance();

        emit TokensRecovered(msg.sender, tokenAddress, amount, to);
    }

    /**
     * @notice Recover maximumal amount of payment by `payer`
     * This can be used after canceling a stream to withdraw all the unvested tokens
     * @dev Reverts when msg.sender is not this stream's payer
     * @param to the address to send the tokens to
     * @return tokensToWithdraw the amount of tokens withdrawn
     */
    function recoverTokens(address to) external returns (uint256 tokensToWithdraw) {
        uint256 tokenBalance_ = tokenBalance();
        uint256 requiredBalanceAfter =
            Math.min(tokenBalance_, Math.max(remainingBalance, recipientCancelBalance));

        tokensToWithdraw = tokenBalance_ - requiredBalanceAfter;

        recoverTokens(address(token()), tokensToWithdraw, to);
    }

    /**
     * @notice Recover ETH accidentally sent to this stream.
     * Reverts if ETH sending failed.
     * @dev This is necessary because `LibClone` creates minimal clones with a default receive function, rather than
     * forwarding to clones, to support gas-restrictive transfers that might fail with the extra gas cost of DELEGATECALL.
     * So rather than block ETH transfers, we're allowing payer to recover ETH.
     * @param to the address to send ETH to, useful when payer might be a contract that can't receive ETH.
     * @param amount the amount of ETH to recover.
     */
    function rescueETH(address to, uint256 amount) external onlyPayer {
        (bool sent,) = to.call{value: amount}("");

        if (!sent) revert ETHRescueFailed();

        emit ETHRescued(msg.sender, to, amount);
    }

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   VIEW FUNCTIONS
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @notice Returns the time elapsed in this stream, or zero if it hasn't started yet.
     */
    function elapsedTime() public view returns (uint256) {
        uint256 startTime_ = startTime();
        if (block.timestamp <= startTime_) return 0;

        uint256 stopTime_ = stopTime();
        if (block.timestamp < stopTime_) return block.timestamp - startTime_;

        return stopTime_ - startTime_;
    }

    /**
     * @notice Get this stream's token balance vs the token amount required to meet the commitment
     * to recipient.
     */
    function tokenAndOutstandingBalance() public view returns (uint256, uint256) {
        return (tokenBalance(), remainingBalance);
    }

    /**
     * @notice Get this stream's recipient's balance, taking into account vesting over time and withdrawals.
     * When a stream is cancelled this function always returns zero, to make sure that `withdraw` no longer sends any funds.
     * To learn the recipient's balance post-cancel use `recipientCancelBalance`.
     */
    function recipientActiveBalance() public view returns (uint256) {
        uint256 startTime_ = startTime();
        uint256 stopTime_ = stopTime();
        uint256 blockTime = block.timestamp;

        if (blockTime <= startTime_) return 0;

        uint256 tokenAmount_ = tokenAmount();
        uint256 balance;
        if (blockTime >= stopTime_) {
            balance = tokenAmount_;
        } else {
            // This is safe because: blockTime > startTime_ (checked above).
            // and stopTime_ > startTime_ (checked in StreamFactory).
            unchecked {
                uint256 elapsedTime_ = blockTime - startTime_;
                uint256 duration = stopTime_ - startTime_;
                balance = elapsedTime_ * tokenAmount_ / duration;
            }
        }

        uint256 remainingBalance_ = remainingBalance;

        // When this function is called after the stream has been cancelled, when balance is less than
        // tokenAmount, without this early exit, the withdrawal calculation below results in an underflow error.
        if (remainingBalance_ == 0) return 0;

        // Take withdrawals into account
        if (tokenAmount_ > remainingBalance_) {
            // Should be safe because remainingBalance_ starts as equal to
            // tokenAmount_ when the stream starts and only grows smaller due to
            // withdrawals, so tokenAmount_ >= remainingBalance_ is always true.
            // Should also be always true that balance >= withdrawalAmount, since
            // at this point balance represents the total amount streamed to recipient
            // so far, which is always the upper bound of what could have been withdrawn.
            unchecked {
                uint256 withdrawalAmount = tokenAmount_ - remainingBalance_;
                balance -= withdrawalAmount;
            }
        }

        return balance;
    }

    /**
     * Returns the recipient balance. Works for both active and cancelled streams.
     */
    function recipientBalance() external view returns (uint256) {
        uint256 recipientCancelBalance_ = recipientCancelBalance;

        if (recipientCancelBalance_ > 0) {
            return recipientCancelBalance_;
        } else {
            return recipientActiveBalance();
        }
    }

    /**
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     *   INTERNAL FUNCTIONS
     * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
     */

    /**
     * @dev Helper function that makes the rest of the code look nicer.
     */
    function tokenBalance() internal view returns (uint256) {
        return token().balanceOf(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 v4.4.1 (token/ERC20/extensions/draft-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 v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-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;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    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));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    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");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    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");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
     * ====
     *
     * [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/v0.5.11/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 (last updated v4.7.0) (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) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 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 10, 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
pragma solidity ^0.8.4;

/// @notice Class with helper read functions for clone with immutable args.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/Clone.sol)
/// @author Adapted from clones with immutable args by zefram.eth, Saw-mon & Natalie
/// (https://github.com/Saw-mon-and-Natalie/clones-with-immutable-args)
abstract contract Clone {
    /// @dev Reads an immutable arg with type bytes.
    function _getArgBytes(uint256 argOffset, uint256 length) internal pure returns (bytes memory arg) {
        uint256 offset = _getImmutableArgsOffset();
        /// @solidity memory-safe-assembly
        assembly {
            // Grab the free memory pointer.
            arg := mload(0x40)
            // Store the array length.
            mstore(arg, length)
            // Copy the array.
            calldatacopy(add(arg, 0x20), add(offset, argOffset), length)
            // Allocate the memory, rounded up to the next 32 byte boudnary.
            mstore(0x40, and(add(add(arg, 0x3f), length), not(0x1f)))
        }
    }

    /// @dev Reads an immutable arg with type address.
    function _getArgAddress(uint256 argOffset) internal pure returns (address arg) {
        uint256 offset = _getImmutableArgsOffset();
        /// @solidity memory-safe-assembly
        assembly {
            arg := shr(0x60, calldataload(add(offset, argOffset)))
        }
    }

    /// @dev Reads an immutable arg with type uint256
    function _getArgUint256(uint256 argOffset) internal pure returns (uint256 arg) {
        uint256 offset = _getImmutableArgsOffset();
        /// @solidity memory-safe-assembly
        assembly {
            arg := calldataload(add(offset, argOffset))
        }
    }

    /// @dev Reads a uint256 array stored in the immutable args.
    function _getArgUint256Array(uint256 argOffset, uint256 length) internal pure returns (uint256[] memory arg) {
        uint256 offset = _getImmutableArgsOffset();
        /// @solidity memory-safe-assembly
        assembly {
            // Grab the free memory pointer.
            arg := mload(0x40)
            // Store the array length.
            mstore(arg, length)
            // Copy the array.
            calldatacopy(add(arg, 0x20), add(offset, argOffset), shl(5, length))
            // Allocate the memory.
            mstore(0x40, add(add(arg, 0x20), shl(5, length)))
        }
    }

    /// @dev Reads an immutable arg with type uint64.
    function _getArgUint64(uint256 argOffset) internal pure returns (uint64 arg) {
        uint256 offset = _getImmutableArgsOffset();
        /// @solidity memory-safe-assembly
        assembly {
            arg := shr(0xc0, calldataload(add(offset, argOffset)))
        }
    }

    /// @dev Reads an immutable arg with type uint8.
    function _getArgUint8(uint256 argOffset) internal pure returns (uint8 arg) {
        uint256 offset = _getImmutableArgsOffset();
        /// @solidity memory-safe-assembly
        assembly {
            arg := shr(0xf8, calldataload(add(offset, argOffset)))
        }
    }

    /// @return offset The offset of the packed immutable args in calldata.
    function _getImmutableArgsOffset() internal pure returns (uint256 offset) {
        /// @solidity memory-safe-assembly
        assembly {
            offset := sub(calldatasize(), shr(0xf0, calldataload(sub(calldatasize(), 2))))
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.17;

interface IStream {
    function initialize() external;

    function withdraw(uint256 amount) external;
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/contracts/",
    "solady/=lib/solady/src/",
    "solmate/=lib/solady/lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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