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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

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

contract StakingContract is ReentrancyGuard, Ownable {
    IERC20 public immutable photon;

    uint256 public rewardRate = 430; // 10% APR of price, updateable
    uint256 public constant MAX_REWARD_DURATION = 31536000; // 365 days
    uint256 public rewardDuration = MAX_REWARD_DURATION; // updateable
    uint256 public immutable contractStartTime; // Contract deployment time

    struct StakeInfo {
        uint256 amount;
        uint256 timestamp;
    }

    mapping(address => StakeInfo) public stakes;

    constructor(IERC20 _photon) {
        photon = _photon;
        contractStartTime = block.timestamp;
    }

     receive() external payable {}

    function stake(uint256 amount) external nonReentrant {
        require(
            photon.transferFrom(_msgSender(), address(this), amount),
            "Transfer Photon tokens failed"
        );

        StakeInfo storage stakeInfo = stakes[_msgSender()];
        if (stakeInfo.amount > 0) {
            uint256 pendingReward = calculateReward(
                stakeInfo.amount,
                stakeInfo.timestamp
            );
            payable(_msgSender()).transfer(pendingReward);
        }

        stakeInfo.amount += amount;
        stakeInfo.timestamp = block.timestamp;
    }

    function unstake(uint256 amount) external nonReentrant {
        StakeInfo storage stakeInfo = stakes[_msgSender()];
        require(stakeInfo.amount >= amount, "Unstaking more than staked");

        uint256 pendingReward = calculateReward(
            stakeInfo.amount,
            stakeInfo.timestamp
        );
        payable(_msgSender()).transfer(pendingReward);

        if (stakeInfo.amount == amount) {
            delete stakes[_msgSender()];
        } else {
            stakeInfo.amount -= amount;
            stakeInfo.timestamp = block.timestamp;
        }

        require(
            photon.transfer(_msgSender(), amount),
            "Transfer Photon tokens failed"
        );
    }

    function claim() external nonReentrant {
        StakeInfo storage stakeInfo = stakes[_msgSender()];
        require(stakeInfo.amount > 0, "No stake to claim rewards from");

        uint256 pendingReward = calculateReward(
            stakeInfo.amount,
            stakeInfo.timestamp
        );
        require(pendingReward > 0, "No rewards to claim");

        payable(_msgSender()).transfer(pendingReward);

        stakeInfo.timestamp = block.timestamp; // update last reward claim time
    }

    function calculateReward(
        uint256 amount,
        uint256 timestamp
    ) public view returns (uint256) {
        uint256 endTime = contractStartTime + rewardDuration;
        uint256 timeDiff;

        if (block.timestamp > endTime) {
            if (timestamp > endTime) return 0;
            timeDiff = endTime - timestamp;
        } else {
            timeDiff = block.timestamp > timestamp
                ? block.timestamp - timestamp
                : 0;
        }

        uint256 reward = (amount * rewardRate * timeDiff) /
            (MAX_REWARD_DURATION * 1_000_000_000);
        return reward;
    }

    function updateRewardRate(uint256 newRate) external onlyOwner {
        rewardRate = newRate;
    }

    function updateRewardDuration(uint256 newDuration) external onlyOwner {
        rewardDuration = newDuration;
    }

    function withdrawStuckETH(uint256 _amount) external onlyOwner {
        require(
            _amount <= address(this).balance,
            "Amount exceeds available ETH"
        );
        payable(owner()).transfer(_amount);
    }

    function emergencyWithdraw() external nonReentrant {
        StakeInfo storage stakeInfo = stakes[_msgSender()];
        require(stakeInfo.amount > 0, "No stake to withdraw");

        uint256 amountToWithdraw = stakeInfo.amount;
        delete stakes[_msgSender()]; // Delete the user's stake info

        require(
            photon.transfer(_msgSender(), amountToWithdraw),
            "Transfer Photon tokens failed"
        );
    }
}

// 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);
    }
}

// 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;
    }
}

// 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);
}

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

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000000000000000000000000f3820318197108c078c88be4720466c98dcfb2e3

-----Decoded View---------------
Arg [0] : _photon (address): 0xf3820318197108c078C88Be4720466c98dCFb2E3

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000f3820318197108c078c88be4720466c98dcfb2e3