// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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);
    }
}

// File: @openzeppelin/contracts/interfaces/IERC20.sol



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

pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Context.sol



// 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;
    }
}

// File: contracts/ISTLP.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.21;

interface ISTLP {
    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function balanceOf(address account) external view returns (uint256);

    function bridge(address to, uint256 amount, bytes32 _raw) external;

    function bridgeAddress() external view returns (address);

    function burn(address from, uint256 amount) external;

    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) external returns (bool);

    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) external returns (bool);

    function mint(address to, uint256 amount) external;

    function setBrige(address _bridge) external;

    function setStaking(address _staking) external;

    function stakingAddress() external view returns (address);

    function totalSupply() external view returns (uint256);

    function transfer(address to, uint256 amount) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// File: contracts/Staking.sol



// Twitter: https://twitter.com/LPshareerc
// Website: https://lpshares.tech
// Telegram: https://t.me/LpShares

// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./ISTLP.sol";

contract Staking is Ownable, ReentrancyGuard {
    struct Share {
        uint depositTime;
        uint initialDeposit;
        uint sumReward;
    }

    mapping(address => Share) public shares;
    IERC20 public stakingToken;
    IERC20 public rewardToken;
    ISTLP public stlp;
    uint public sumReward;
    uint private constant PRECISION = 1e18;
    address private _taxWallet;
    uint public totalReward;
    uint256 public totalDistributed;
    bool public initialized;
    uint256 public rewardDuration = 2 weeks;

    constructor(address _stlp) {
        stlp = ISTLP(_stlp);
        _taxWallet = _msgSender();
    }

    function init(address _rewardToken, address _stakingToken) external {
        require(!initialized, "alrealy initialized");
        stakingToken = IERC20(_stakingToken);
        rewardToken = IERC20(_rewardToken);
        initialized = true;
    }

    function setStakeToken(IERC20 token_) external onlyOwner {
        stakingToken = token_;
    }

    function setRewardToken(IERC20 token_) external onlyOwner {
        rewardToken = token_;
    }

    function deposit(uint amount) external nonReentrant {
        require(amount > 0, "Amount must be greater than zero");
        Share memory share = shares[_msgSender()];
        stakingToken.transferFrom(_msgSender(), address(this), amount);
        stlp.mint(msg.sender, amount);
        _payoutGainsUpdateShare(
            _msgSender(),
            share,
            share.initialDeposit + amount,
            true
        );
    }

    function withdraw() external nonReentrant {
        Share memory share = shares[_msgSender()];
        require(share.initialDeposit > 0, "No initial deposit");
        require(
            share.depositTime + 1 days < block.timestamp,
            "withdraw after one week"
        );
        stlp.burn(msg.sender, share.initialDeposit);
        stakingToken.transfer(_msgSender(), share.initialDeposit);
        _payoutGainsUpdateShare(_msgSender(), share, 0, true);
    }

    function claim() external nonReentrant {
        Share memory share = shares[_msgSender()];
        require(share.initialDeposit > 0, "No initial deposit");
        require(
            share.depositTime + rewardDuration < block.timestamp,
            "withdraw after two week"
        );
        _payoutGainsUpdateShare(
            _msgSender(),
            share,
            share.initialDeposit,
            false
        );
    }

    function _payoutGainsUpdateShare(
        address who,
        Share memory share,
        uint newAmount,
        bool resetTimer
    ) private {
        uint gains;
        if (share.initialDeposit != 0)
            gains =
                (share.initialDeposit * (sumReward - share.sumReward)) /
                PRECISION;

        if (newAmount == 0) delete shares[who];
        else if (resetTimer)
            shares[who] = Share(block.timestamp, newAmount, sumReward);
        else shares[who] = Share(share.depositTime, newAmount, sumReward);

        if (gains > 0) {
            rewardToken.transfer(who, gains);
            totalDistributed = totalDistributed + gains;
        }
    }

    function pending(address who) external view returns (uint) {
        Share memory share = shares[who];
        return
            (share.initialDeposit * (sumReward - share.sumReward)) / PRECISION;
    }

    function updateReward(uint256 _amount) external {
        require(
            _msgSender() == address(rewardToken),
            "only accept token contract"
        );

        uint balance = stakingToken.balanceOf(address(this));

        if (_amount == 0 || balance == 0) return;

        uint gpus = (_amount * PRECISION) / balance;
        sumReward += gpus;
        totalReward += _amount;
    }
}