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



// 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);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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;
    }
}

// File: @openzeppelin/contracts/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);
}

// 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/Staking.sol



/**

 ______     __  __     __     ______     ______     ______     __     __  __     __    __    
/\  ___\   /\ \_\ \   /\ \   /\  == \   /\  __ \   /\  == \   /\ \   /\ \/\ \   /\ "-./  \   
\ \___  \  \ \  __ \  \ \ \  \ \  __<   \ \  __ \  \ \  __<   \ \ \  \ \ \_\ \  \ \ \-./\ \  
 \/\_____\  \ \_\ \_\  \ \_\  \ \_____\  \ \_\ \_\  \ \_\ \_\  \ \_\  \ \_____\  \ \_\ \ \_\ 
  \/_____/   \/_/\/_/   \/_/   \/_____/   \/_/\/_/   \/_/ /_/   \/_/   \/_____/   \/_/  \/_/                                                                                              
 _____     ______     ______                                                                 
/\  __-.  /\  __ \   /\  __ \                                                                
\ \ \/\ \ \ \  __ \  \ \ \/\ \                                                               
 \ \____-  \ \_\ \_\  \ \_____\                                                              
  \/____/   \/_/\/_/   \/_____/                                                              


    Website: https://shibariumdao.io
    Telegram: https://t.me/ShibariumDAO

**/
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

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

contract ShibariumDAO2Staking is ReentrancyGuard, Ownable {
    struct Stake {
        uint256 amount;
        uint256 startTime;
        uint256 claimedAmountShib;
        uint256 claimedAmountBone;
        bool withdrawn;
    }

    mapping(address => Stake[]) public stakes;

    mapping(address => uint256) public claimedNumber;
    uint256 constant CLAIM_FEE_NUMERATOR = 50;
    uint256 constant CLAIM_FEE_DENOMINATOR = 10000;

    IERC20 public immutable SHIBDAO;
    IERC20 public immutable SHIB;
    IERC20 public immutable BONE;

    uint256 public constant SHIBDAO_SUPPLY_FREE = 500_000_000 ether; // 1/2 of total supply
    uint256 public SHIB_REWARD_AMOUNT;
    uint256 public BONE_REWARD_AMOUNT;

    uint256 public constant LOCK_TIME = 30 days;

    event StakeAdded(address staker, uint256 amount, uint256 lockTime);
    event StakeRemoved(address staker, uint256 amount, uint256 lockTime);
    event RewardsClaimed(
        address staker,
        uint256 shibAmount,
        uint256 boneAmount
    );

    constructor(
        address _shibdao,
        address _shib,
        address _bone
    ) ReentrancyGuard() Ownable() {
        SHIBDAO = IERC20(_shibdao);
        SHIB = IERC20(_shib);
        BONE = IERC20(_bone);
    }

    function addStake(uint256 amount) external nonReentrant {
        bool success = SHIBDAO.transferFrom(msg.sender, address(this), amount);
        require(success, "Transfer failed");

        stakes[msg.sender].push(Stake(amount, block.timestamp, 0, 0, false));
        emit StakeAdded(msg.sender, amount, block.timestamp);
    }

    function removeStake(uint256 index) external nonReentrant {
        Stake storage stake = stakes[msg.sender][index];

        require(stake.startTime + LOCK_TIME <= block.timestamp, "Stake locked");
        require(!stake.withdrawn, "Stake already withdrawn");

        bool success = SHIBDAO.transfer(msg.sender, stake.amount);
        require(success, "Transfer failed");

        stake.withdrawn = true;

        emit StakeRemoved(msg.sender, stake.amount, block.timestamp);
    }

    function claimRewards(uint256 index) external nonReentrant {
        Stake storage stake = stakes[msg.sender][index];

        (uint256 amountShib, uint256 amountBone) = getRewards(
            msg.sender,
            index
        );
        stake.claimedAmountShib += amountShib;
        stake.claimedAmountBone += amountBone;

        uint256 claimFeeNumerator = getClaimFee(msg.sender);

        uint256 amountShibFee = (amountShib * claimFeeNumerator) /
            CLAIM_FEE_DENOMINATOR;
        uint256 amountBoneFee = (amountBone * claimFeeNumerator) /
            CLAIM_FEE_DENOMINATOR;

        bool shibSuccess = SHIB.transfer(
            msg.sender,
            amountShib - amountShibFee
        );
        require(shibSuccess, "Transfer failed");
        bool boneSuccess = BONE.transfer(
            msg.sender,
            amountBone - amountBoneFee
        );
        require(boneSuccess, "Transfer failed");

        claimedNumber[msg.sender] += 1;

        emit RewardsClaimed(msg.sender, amountShib, amountBone);
    }

    function getClaimFee(address claimant) public view returns (uint256) {
        uint256 baseFee = claimedNumber[claimant] * CLAIM_FEE_NUMERATOR;
        if (baseFee > 600) {
            return 600;
        } else {
            return baseFee;
        }
    }

    function getRewards(
        address staker,
        uint256 index
    ) public view returns (uint256, uint256) {
        Stake storage stake = stakes[staker][index];
        uint256 shibAmountTotal = (SHIB_REWARD_AMOUNT * stake.amount) /
            SHIBDAO_SUPPLY_FREE;
        uint256 boneAmountTotal = (BONE_REWARD_AMOUNT * stake.amount) /
            SHIBDAO_SUPPLY_FREE;

        uint256 timeElapsed = block.timestamp - stake.startTime;
        if (timeElapsed > LOCK_TIME) timeElapsed = LOCK_TIME;

        uint256 shibAmount = (shibAmountTotal * timeElapsed) / LOCK_TIME;
        uint256 boneAmount = (boneAmountTotal * timeElapsed) / LOCK_TIME;

        uint256 shibAmountToClaim = shibAmount - stake.claimedAmountShib;
        uint256 boneAmountToClaim = boneAmount - stake.claimedAmountBone;

        return (shibAmountToClaim, boneAmountToClaim);
    }

    function getStakes(
        address user
    ) external view returns (Stake[] memory userStakes) {
        return stakes[user];
    }

    function setRewards(
        uint256 shibAmount,
        uint256 boneAmount
    ) external onlyOwner {
        SHIB_REWARD_AMOUNT = shibAmount;
        BONE_REWARD_AMOUNT = boneAmount;
    }

    function unstickTokens(address token, uint256 amount) external onlyOwner {
        if (token == address(0)) {
            payable(msg.sender).transfer(amount);
        } else {
            IERC20(token).transfer(msg.sender, amount);
        }
    }
}