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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

//Reward per second is 0 on deploy. once it has been set, staking has started. no takebacks.
contract PepeYespStaking is Ownable, ReentrancyGuard {
    bool public stakingPaused = true;
    uint256 public stakingPeriod = 1209600; //14 days
    uint256 public rewardPoolSize = 3000000 * 10**18; // 3mil
    uint256 public rewardPerSecond = rewardPoolSize / stakingPeriod;
    IERC20 public stakingToken = IERC20(0x6982508145454Ce325dDbE47a25d4ec3d2311933); // PEPE
    IERC20 public rewardToken = IERC20(0x46ccA329970B33e1a007DD4ef0594A1cedb3E72a); // YESP

    event Stake(address indexed stakoor, uint256 amount);
    event Withdraw(address indexed stakoor, uint256 amount);
    event Harvest(address indexed stakoor, uint256 rewards);

    uint256 public totalStaked = 0;
    mapping(address => uint256) public stakingTimestamps;
    mapping(address => uint256) public stakedAmount;
    mapping(address => uint256) public rewardsHarvested;

    uint256 public taxFee = 500;
    uint256 public taxesHeld = 0;

    function stake(uint256 amount) external nonReentrant {
        require(!stakingPaused, "Staking paused");
        require(stakingToken.allowance(msg.sender, address(this)) >= amount, "PEPE Allowance");
        require(stakingToken.balanceOf(msg.sender) >= amount, "PEPE Balance");
        if (stakedAmount[msg.sender] != 0 ) { _harvest(); }

        uint256 taxedAmount = taxFee * amount / 10000;

        stakingTimestamps[msg.sender] = block.timestamp;
        stakedAmount[msg.sender] += (amount - taxedAmount);
        totalStaked += (amount - taxedAmount);
        taxesHeld += taxedAmount;
        stakingToken.transferFrom(msg.sender, address(this), amount);
        emit Stake(msg.sender, amount);
    }

    function withdraw() external nonReentrant {
        require((stakedAmount[msg.sender] > 0), "Nothing staked");
        _harvest();
        totalStaked -= stakedAmount[msg.sender];
        stakingToken.transfer(msg.sender, stakedAmount[msg.sender]);
        emit Withdraw(msg.sender, stakedAmount[msg.sender]);
        stakedAmount[msg.sender] = 0;
    }

    function _harvest() private {
        uint256 timeStaked = block.timestamp - stakingTimestamps[msg.sender];
        uint256 rewardAmount = timeStaked * rewardPerSecond * stakedAmount[msg.sender] / totalStaked;
        require(rewardToken.balanceOf(address(this)) >= rewardAmount, "Rewards insufficient");
        stakingTimestamps[msg.sender] = block.timestamp;
        rewardsHarvested[msg.sender] += rewardAmount;
        rewardToken.transfer(msg.sender, rewardAmount);
        emit Harvest(msg.sender, rewardAmount);
    }

    function harvest() public nonReentrant {
        _harvest();
    }

    function emergencyWithdraw() external nonReentrant {
        totalStaked -= stakedAmount[msg.sender];
        emit Withdraw(msg.sender, stakedAmount[msg.sender]);
        stakingToken.transfer(msg.sender, stakedAmount[msg.sender]);
        stakedAmount[msg.sender] = 0;
    }

    function unclaimedRewards(address staker) external view returns (uint256) {
        if (stakingTimestamps[staker] == 0 || stakedAmount[staker] == 0) { return 0; }
        return (block.timestamp - stakingTimestamps[staker]) * rewardPerSecond * stakedAmount[staker] / totalStaked;
    }

    //ADMIN
    function changeVars(bool _stakingPaused, uint256 _stakingPeriod, uint256 _rewardPoolSize, address _stakingToken, address _rewardToken, uint256 _taxFee) external onlyOwner {
        require(stakingPaused || (totalStaked == 0), "Staking started");
        require(_taxFee <= 2500, "Tea party");
        if (stakingPeriod != _stakingPeriod) { stakingPeriod = _stakingPeriod; }
        if (rewardPoolSize != _rewardPoolSize) { rewardPoolSize = _rewardPoolSize; }
        if ((stakingPeriod != _stakingPeriod) || (rewardPoolSize != _rewardPoolSize)) {  rewardPerSecond = (_rewardPoolSize/_stakingPeriod); }
        if (address(stakingToken) != _stakingToken) { stakingToken = IERC20(_stakingToken); }
        if (address(rewardToken) != _rewardToken) { rewardToken = IERC20(_rewardToken); }
        if (stakingPaused != _stakingPaused) { stakingPaused = _stakingPaused; }
        if (taxFee != _taxFee) { taxFee = _taxFee; }
    }

    function theTaxMan() external onlyOwner {
        stakingToken.transfer(msg.sender, stakingToken.balanceOf(address(this)) - totalStaked);
        taxesHeld = 0;
    }


    //EMERGENCY ONLY
    function recoverToken(address _token, uint256 amount) external virtual onlyOwner {
        require(_token != address(stakingToken), "No ruggaroo");
        IERC20(_token).transfer(owner(), amount);
    }

}

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

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// 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 (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;
    }
}

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

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