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/**
 *Submitted for verification at Etherscan.io on 2020-11-09
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 a boolean value indicating whether the operation succeeded.
     *
     * 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 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 `sender` to `recipient` 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 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);
}


contract TwoWeeksNotice {
    
    struct StakeState {
        uint64 balance;
        uint64 unlockPeriod; // time it takes from requesting withdraw to being able to withdraw
        uint64 lockedUntil; // 0 if withdraw is not requested
        uint64 since;
        uint128 accumulated; // token-days staked
        uint128 accumulatedStrict; // token-days staked sans withdraw periods
    }
    
    event StakeUpdate(address indexed from, uint64 balance);
    event WithdrawRequest(address indexed from, uint64 until);
    
    mapping(address => StakeState) private _states;
    
    IERC20 private token;
    
    constructor (IERC20 _token) public {
        token = _token;
    }

    function getStakeState(address account) external view returns (uint64, uint64, uint64, uint64) {
        StakeState storage ss = _states[account];
        return (ss.balance, ss.unlockPeriod, ss.lockedUntil, ss.since);
    }
    
    function getAccumulated(address account) external view returns (uint128, uint128) {
        StakeState storage ss = _states[account];
        return (ss.accumulated, ss.accumulatedStrict);
    }

    function estimateAccumulated(address account) external view returns (uint128, uint128) {
        StakeState storage ss = _states[account];
        uint128 sum = ss.accumulated;
        uint128 sumStrict = ss.accumulatedStrict;
        if (ss.balance > 0) {
            uint256 until = block.timestamp;
            if (ss.lockedUntil > 0 && ss.lockedUntil < block.timestamp) {
                until = ss.lockedUntil;
            }
            if (until > ss.since) {
                uint128 delta = uint128( (uint256(ss.balance) * (until - ss.since))/86400 );
                sum += delta;
                if (ss.lockedUntil == 0) {
                    sumStrict += delta;
                }
            }
        }
        return (sum, sumStrict);
    }
    
    
    function updateAccumulated(StakeState storage ss) private {
        if (ss.balance > 0) {
            uint256 until = block.timestamp;
            if (ss.lockedUntil > 0 && ss.lockedUntil < block.timestamp) {
                until = ss.lockedUntil;
            }
            if (until > ss.since) {
                uint128 delta = uint128( (uint256(ss.balance) * (until - ss.since))/86400 );
                ss.accumulated += delta;
                if (ss.lockedUntil == 0) {
                    ss.accumulatedStrict += delta;
                }
            }
        }
    }

    function stake(uint64 amount, uint64 unlockPeriod) external {
        StakeState storage ss = _states[msg.sender];
        require(amount > 0, "amount must be positive");
        require(ss.balance <= amount, "cannot decrease balance");
        require(unlockPeriod <= 1000 days, "unlockPeriod cannot be higher than 1000 days");
        require(ss.unlockPeriod <= unlockPeriod, "cannot decrease unlock period");
        require(unlockPeriod >= 2 weeks, "unlock period can't be less than 2 weeks");
        
        updateAccumulated(ss);
        
        uint128 delta = amount - ss.balance;
        if (delta > 0) {
            require(token.transferFrom(msg.sender, address(this), delta), "transfer unsuccessful");
        }

        ss.balance = amount;
        ss.unlockPeriod = unlockPeriod;
        ss.lockedUntil = 0;
        ss.since = uint64(block.timestamp);
        emit StakeUpdate(msg.sender, amount);
    }
    
    function requestWithdraw() external {
         StakeState storage ss = _states[msg.sender];
         require(ss.balance > 0);
         updateAccumulated(ss);
         ss.since = uint64(block.timestamp);
         ss.lockedUntil = uint64(block.timestamp + ss.unlockPeriod);
    }

    function withdraw(address to) external {
        StakeState storage ss = _states[msg.sender];
        require(ss.balance > 0, "must have tokens to withdraw");
        require(ss.lockedUntil != 0, "unlock not requested");
        require(ss.lockedUntil < block.timestamp, "still locked");
        updateAccumulated(ss);
        uint128 balance = ss.balance;
        ss.balance = 0;
        ss.unlockPeriod = 0;
        ss.lockedUntil = 0;
        ss.since = 0;
        require(token.transfer(to, balance), "transfer unsuccessful");
        emit StakeUpdate(msg.sender, 0);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IERC20","name":"_token","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint64","name":"balance","type":"uint64"}],"name":"StakeUpdate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint64","name":"until","type":"uint64"}],"name":"WithdrawRequest","type":"event"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"estimateAccumulated","outputs":[{"internalType":"uint128","name":"","type":"uint128"},{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getAccumulated","outputs":[{"internalType":"uint128","name":"","type":"uint128"},{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getStakeState","outputs":[{"internalType":"uint64","name":"","type":"uint64"},{"internalType":"uint64","name":"","type":"uint64"},{"internalType":"uint64","name":"","type":"uint64"},{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"requestWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"amount","type":"uint64"},{"internalType":"uint64","name":"unlockPeriod","type":"uint64"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000008a2279d4a90b6fe1c4b30fa660cc9f926797baa2

-----Decoded View---------------
Arg [0] : _token (address): 0x8A2279d4A90B6fe1C4B30fa660cC9f926797bAA2

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000008a2279d4a90b6fe1c4b30fa660cc9f926797baa2

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ipfs://8ad9755d1ff791d9a74d701752dffeb3e5c8e8ec15a754a5cd7d90fc45c86744