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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import './utils/ERC20.sol';
import './interface/IFrankencoin.sol';
import './interface/IReserve.sol';
import './Leadrate.sol';

/**
 * @title Savings
 *
 * Module to enable savings based on a Leadrate ("Leitzins") module.
 *
 * As the interest rate changes, the speed at which 'ticks' are accumulated is
 * adjusted. The ticks counter serves as the basis for calculating the interest
 * due for the individual accoutns.
 *
 * The saved ZCHF are subject to a lockup of up to 3 days and only start to yield
 * an interest after the lockup ended. The purpose of this lockup is to discourage
 * short-term holdings and to avoid paying interest to transactional accounts.
 * Transactional accounts typically do not need an incentive to hold Frankencoins.
 */
contract Savings is Leadrate {
	uint64 public immutable INTEREST_DELAY = uint64(3 days);

	IERC20 public immutable zchf;

	mapping(address => Account) public savings;

	struct Account {
		uint192 saved;
		uint64 ticks;
	}

	event Saved(address indexed account, uint192 amount);
	event InterestCollected(address indexed account, uint256 interest);
	event Withdrawn(address indexed account, uint192 amount);

	error FundsLocked(uint40 remainingSeconds);

	// The module is considered disabled if the interest is zero or about to become zero within three days.
	error ModuleDisabled();

	constructor(IFrankencoin zchf_, uint24 initialRatePPM) Leadrate(IReserve(zchf_.reserve()), initialRatePPM) {
		zchf = IERC20(zchf_);
	}

	/**
	 * Shortcut for refreshBalance(msg.sender)
	 */
	function refreshMyBalance() public returns (uint192) {
		return refreshBalance(msg.sender);
	}

	/**
	 * Collects the accrued interest and adds it to the account.
	 *
	 * It can be beneficial to do so every now and then in order to start collecting
	 * interest on the accrued interest.
	 */
	function refreshBalance(address owner) public returns (uint192) {
		return refresh(owner).saved;
	}

	function refresh(address accountOwner) internal returns (Account storage) {
		Account storage account = savings[accountOwner];
		uint64 ticks = currentTicks();
		if (ticks > account.ticks) {
			uint192 earnedInterest = calculateInterest(account, ticks);
			if (earnedInterest > 0) {
				// collect interest as you go and trigger accounting event
				(IFrankencoin(address(zchf))).coverLoss(address(this), earnedInterest);
				account.saved += earnedInterest;
				emit InterestCollected(accountOwner, earnedInterest);
			}
			account.ticks = ticks;
		}
		return account;
	}

	function accruedInterest(address accountOwner) public view returns (uint192) {
		return accruedInterest(accountOwner, block.timestamp);
	}

	function accruedInterest(address accountOwner, uint256 timestamp) public view returns (uint192) {
		Account memory account = savings[accountOwner];
		return calculateInterest(account, ticks(timestamp));
	}

	function calculateInterest(Account memory account, uint64 ticks) public view returns (uint192) {
		if (ticks <= account.ticks || account.ticks == 0) {
			return 0;
		} else {
			uint192 earnedInterest = uint192((uint256(ticks - account.ticks) * account.saved) / 1000000 / 365 days);
			uint256 equity = IFrankencoin(address(zchf)).equity();
			if (earnedInterest > equity) {
				return uint192(equity); // save conversion as equity is smaller than uint192 earnedInterest
			} else {
				return earnedInterest;
			}
		}
	}

	/**
	 * Save 'amount'.
	 */
	function save(uint192 amount) public {
		save(msg.sender, amount);
	}

	function adjust(uint192 targetAmount) public {
		Account storage balance = refresh(msg.sender);
		if (balance.saved < targetAmount) {
			save(targetAmount - balance.saved);
		} else if (balance.saved > targetAmount) {
			withdraw(msg.sender, balance.saved - targetAmount);
		}
	}

	/**
	 * Send 'amount' to the account of the provided owner.
	 * The funds sent to the account are locked for a while, depending on how much already is in there.
	 */
	function save(address owner, uint192 amount) public {
		if (currentRatePPM == 0) revert ModuleDisabled();
		if (nextRatePPM == 0 && (nextChange <= block.timestamp + INTEREST_DELAY)) revert ModuleDisabled();
		Account storage balance = refresh(owner);
		zchf.transferFrom(msg.sender, address(this), amount);
		uint64 ticks = currentTicks();
		assert(balance.ticks >= ticks);
		uint256 saved = balance.saved;
		uint64 weightedAverage = uint64(
			(saved * (balance.ticks - ticks) + uint256(amount) * currentRatePPM * INTEREST_DELAY) / (saved + amount)
		);
		balance.saved += amount;
		balance.ticks = ticks + weightedAverage;
		emit Saved(owner, amount);
	}

	/**
	 * Withdraw up to 'amount' to the target address.
	 * When trying to withdraw more than available, all that is available is withdrawn.
	 * Returns the acutally transferred amount.
	 *
	 * Fails if the funds in the account have not been in the account for long enough.
	 */
	function withdraw(address target, uint192 amount) public returns (uint256) {
		Account storage account = refresh(msg.sender);
		if (account.ticks > currentTicks()) {
			revert FundsLocked(uint40(account.ticks - currentTicks()) / currentRatePPM);
		} else if (amount >= account.saved) {
			amount = account.saved;
			delete savings[msg.sender];
		} else {
			account.saved -= amount;
		}
		zchf.transfer(target, amount);
		emit Withdrawn(msg.sender, amount);
		return amount;
	}
}

/**
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2016-2019 zOS Global Limited
 *
 */
pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */

interface IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    /**
     * @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 `recipient`.
     *
     * Returns always true. Throws error on failure.
     *
     * Emits a `Transfer` event.
     */
    function transfer(address recipient, 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 can change 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.
     *
     * > 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 `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns always true. Throws error on failure.
     *
     * Emits a `Transfer` event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC677Receiver {
    
    function onTokenTransfer(address from, uint256 amount, bytes calldata data) external returns (bool);

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./IReserve.sol";

interface IFrankencoin is IERC20 {
    function suggestMinter(address _minter, uint256 _applicationPeriod, uint256 _applicationFee, string calldata _message) external;

    function registerPosition(address position) external;

    function denyMinter(address minter, address[] calldata helpers, string calldata message) external;

    function reserve() external view returns (IReserve);

    function minterReserve() external view returns (uint256);

    function calculateAssignedReserve(uint256 mintedAmount, uint32 _reservePPM) external view returns (uint256);

    function calculateFreedAmount(uint256 amountExcludingReserve, uint32 reservePPM) external view returns (uint256);

    function equity() external view returns (uint256);

    function isMinter(address minter) external view returns (bool);

    function getPositionParent(address position) external view returns (address);

    function mint(address target, uint256 amount) external;

    function mintWithReserve(address target, uint256 amount, uint32 reservePPM, uint32 feePPM) external;

    function burnFrom(address target, uint256 amount) external;

    function burnWithoutReserve(uint256 amountIncludingReserve, uint32 reservePPM) external;

    function burnFromWithReserve(address payer, uint256 targetTotalBurnAmount, uint32 _reservePPM) external returns (uint256);

    function burnWithReserve(uint256 amountExcludingReserve, uint32 reservePPM) external returns (uint256);

    function coverLoss(address source, uint256 amount) external;

    function collectProfits(address source, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IReserve is IERC20 {
   function invest(uint256 amount, uint256 expected) external returns (uint256);
   function checkQualified(address sender, address[] calldata helpers) external view;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import './interface/IERC20.sol';
import './interface/IFrankencoin.sol';
import './interface/IReserve.sol';

/**
 * @title Leadrate (attempt at translating the nicely concise German term 'Leitzins')
 *
 * A module that can provide other modules with the lead interest rate for the system.
 *
 **/
contract Leadrate {
	IReserve public immutable equity;

	// the following five variables are less than 256 bit so they should be stored
	// in the same slot, making them cheap to access together, right?

	uint24 public currentRatePPM; // 24 bit allows rates of up to 1670% per year
	uint24 public nextRatePPM;
	uint40 public nextChange;

	uint40 private anchorTime; // 40 bits for time in seconds spans up to 1000 human generations
	uint64 private ticksAnchor; // in bips * seconds, uint88 allows up to

	event RateProposed(address who, uint24 nextRate, uint40 nextChange);
	event RateChanged(uint24 newRate);

	error NoPendingChange();
	error ChangeNotReady();

	constructor(IReserve equity_, uint24 initialRatePPM) {
		equity = equity_;
		nextRatePPM = initialRatePPM;
		currentRatePPM = initialRatePPM;
		nextChange = uint40(block.timestamp);
		anchorTime = nextChange;
		ticksAnchor = 0;
		emit RateChanged(initialRatePPM); // emit for init indexing, if wanted
	}

	/**
	 * Proposes a new interest rate that will automatically be applied after seven days.
	 * To cancel a proposal, just overwrite it with a new one proposing the current rate.
	 */
	function proposeChange(uint24 newRatePPM_, address[] calldata helpers) external {
		equity.checkQualified(msg.sender, helpers);
		nextRatePPM = newRatePPM_;
		nextChange = uint40(block.timestamp + 7 days);
		emit RateProposed(msg.sender, nextRatePPM, nextChange);
	}

	/**
	 * Setting a previously proposed interest rate change into force.
	 */
	function applyChange() external {
		if (currentRatePPM == nextRatePPM) revert NoPendingChange();
		uint40 timeNow = uint40(block.timestamp);
		if (timeNow < nextChange) revert ChangeNotReady();
		ticksAnchor += (timeNow - anchorTime) * currentRatePPM;
		anchorTime = timeNow;
		currentRatePPM = nextRatePPM;
		emit RateChanged(currentRatePPM);
	}

	/**
	 * Total accumulated 'interest ticks' since this contract was deployed.
	 * One 'tick' is a ppm-second, so one months of 12% annual interest is
	 *   120000*30*24*3600 = 311040000000 ticks.
	 * Two months of 6% annual interest would result in the same number of
	 * ticks. For simplicity, this is linear, so there is no "interest on interest".
	 */
	function currentTicks() public view returns (uint64) {
		return ticks(block.timestamp);
	}

	function ticks(uint256 timestamp) public view returns (uint64) {
		return ticksAnchor + (uint64(timestamp) - anchorTime) * currentRatePPM;
	}
}

// SPDX-License-Identifier: MIT
// Copied and adjusted from OpenZeppelin
// Adjustments:
// - modifications to support ERC-677
// - removed require messages to save space
// - removed unnecessary require statements
// - removed GSN Context
// - upgraded to 0.8 to drop SafeMath
// - let name() and symbol() be implemented by subclass
// - infinite allowance support, with 2^255 and above considered infinite

pragma solidity ^0.8.0;

import "../interface/IERC20.sol";
import "../interface/IERC677Receiver.sol";

/**
 * @dev Implementation of the `IERC20` interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using `_mint`.
 * For a generic mechanism see `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 */

abstract contract ERC20 is IERC20 {
    mapping(address account => uint256 balance) private _balances;

    mapping(address account => mapping(address spender => uint256 allowance)) private _allowances;

    uint256 internal constant INFINITY = (1 << 255);

    uint256 private _totalSupply;

    uint8 public immutable override decimals;

    // Copied from https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4139/files#diff-fa792f7d08644eebc519dac2c29b00a54afc4c6a76b9ef3bba56c8401fe674f6
    // Indicates an error related to the current balance of a sender. Used in transfers.
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);
    // Indicates a failure with the spender’s allowance. Used in transfers.
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    constructor(uint8 _decimals) {
        decimals = _decimals;
    }

    /**
     * @dev See `IERC20.totalSupply`.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See `IERC20.balanceOf`.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See `IERC20.transfer`.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See `IERC20.allowance`.
     */
    function allowance(address owner, address spender) external view override returns (uint256) {
        return _allowance(owner, spender);
    }

    function _allowance(address owner, address spender) internal view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See `IERC20.approve`.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) external override returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev See `IERC20.transferFrom`.
     *
     * Emits an `Approval` event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of `ERC20`;
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        _transfer(sender, recipient, amount);
        _useAllowance(sender, msg.sender, amount);
        return true;
    }

    function _useAllowance(address owner, address spender, uint256 amount) internal {
        uint256 currentAllowance = _allowance(owner, spender);
        if (currentAllowance < INFINITY) {
            // Only decrease the allowance if it was not set to 'infinite'
            // Documented in github.com/aktionariat/contracts/blob/master/doc/infiniteallowance.md
            if (currentAllowance < amount) revert ERC20InsufficientAllowance(owner, currentAllowance, amount);
            _approve(owner, spender, currentAllowance - amount);
        }
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to `transfer`, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a `Transfer` event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(recipient != address(0));

        _beforeTokenTransfer(sender, recipient, amount);
        if (_balances[sender] < amount) revert ERC20InsufficientBalance(sender, _balances[sender], amount);
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a `Transfer` event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address recipient, uint256 amount) internal virtual {
        require(recipient != address(0));

        _beforeTokenTransfer(address(0), recipient, amount);

        _totalSupply += amount;
        _balances[recipient] += amount;
        emit Transfer(address(0), recipient, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a `Transfer` event with `to` set to the zero address.
     */
    function _burn(address account, uint256 amount) internal virtual {
        _beforeTokenTransfer(account, address(0), amount);

        _totalSupply -= amount;
        _balances[account] -= amount;
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an `Approval` event.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

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

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Savings.Account","name":"account","type":"tuple"},{"internalType":"uint64","name":"ticks","type":"uint64"}],"name":"calculateInterest","outputs":[{"internalType":"uint192","name":"","type":"uint192"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentRatePPM","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentTicks","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"equity","outputs":[{"internalType":"contract IReserve","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nextChange","outputs":[{"internalType":"uint40","name":"","type":"uint40"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nextRatePPM","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint24","name":"newRatePPM_","type":"uint24"},{"internalType":"address[]","name":"helpers","type":"address[]"}],"name":"proposeChange","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"refreshBalance","outputs":[{"internalType":"uint192","name":"","type":"uint192"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"refreshMyBalance","outputs":[{"internalType":"uint192","name":"","type":"uint192"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint192","name":"amount","type":"uint192"}],"name":"save","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint192","name":"amount","type":"uint192"}],"name":"save","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"savings","outputs":[{"internalType":"uint192","name":"saved","type":"uint192"},{"internalType":"uint64","name":"ticks","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"ticks","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"uint192","name":"amount","type":"uint192"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"zchf","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000b58e61c3098d85632df34eecfb899a1ed80921cb000000000000000000000000000000000000000000000000000000000000c350

-----Decoded View---------------
Arg [0] : zchf_ (address): 0xB58E61C3098d85632Df34EecfB899A1Ed80921cB
Arg [1] : initialRatePPM (uint24): 50000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000b58e61c3098d85632df34eecfb899a1ed80921cb
Arg [1] : 000000000000000000000000000000000000000000000000000000000000c350