// 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/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/TruthGPTStake.sol



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

import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/access/Ownable.sol';

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

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

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

contract TruthGPTStake is ReentrancyGuard, Ownable {
  ITruthGPT public truthGPT;

  struct Stake {
    uint256 amount;
    uint256 timestamp;
  }

  uint256 public arp = 750;
  uint256 public minStakingPeriod = 30 days;
  uint256 public withdrawPenalty = 25;

  mapping(address => Stake[]) private stakes;
  mapping(address => uint256) private stakingBalance;
  mapping(address => uint256) private lastClaimTime;

  event Staked(address indexed from, uint256 amount);
  event Unstaked(address indexed to, uint256 amount, uint256 stakingperiod);
  event Penalty(address indexed to, uint256 amount);
  event RewardClaimed(address indexed to, uint256 amount);

  constructor(address truthTokenAddress) Ownable() {
    truthGPT = ITruthGPT(truthTokenAddress);
  }

  function setARP(uint256 _arp) external onlyOwner {
    require(_arp > 0, "Amount cann't be zero");
    arp = _arp;
  }

  function setMinStakingPeriod(uint256 _minStakingPeriod) external onlyOwner {
    require(_minStakingPeriod > 0, "Amount cann't be zero");
    minStakingPeriod = _minStakingPeriod;
  }

  function setWithdrawPenalty(uint256 _withdrawPenalty) external onlyOwner {
    require(_withdrawPenalty > 0, "Amount cann't be zero");
    withdrawPenalty = _withdrawPenalty;
  }

  function stakingbalance(address _staker) public view returns (uint256) {
    return stakingBalance[_staker];
  }

  function stakerdetails(address _staker, uint256 _index) public view returns (Stake memory) {
    return stakes[_staker][_index];
  }

  function lastclaimtime(address _staker) public view returns (uint256) {
    return lastClaimTime[_staker];
  }

  function allStaked(address _staker) public view returns (Stake[] memory) {
    return stakes[_staker];
  }

  function widthdrawTruth(address _address, uint256 _amount) public onlyOwner {
    truthGPT.transfer(_address, _amount);
  }

  function stake(uint256 _amount) public {
    require(_amount >= 1, "Amount can't be zero");
    require(truthGPT.balanceOf(msg.sender) >= _amount, 'Insufficient $TRUTH balance');

    truthGPT.transferFrom(msg.sender, address(this), _amount);
    stakingBalance[msg.sender] += _amount;
    stakes[msg.sender].push(Stake(_amount, block.timestamp));
    emit Staked(msg.sender, _amount);
  }

  function unstake(uint256 _index) public nonReentrant {
    require(stakes[msg.sender].length > 0, 'No stakes found for the address');
    require(stakes[msg.sender].length >= _index + 1, 'Stake does not exist');
    // uint256 totalStaked = stakingBalance[msg.sender];
    uint256 lastStakeIndex = _index;
    Stake memory lastStake = stakes[msg.sender][lastStakeIndex];
    uint256 timeStaked = block.timestamp - lastStake.timestamp;
    require(timeStaked >= minStakingPeriod, 'Minimum staking period not reached');
    uint256 latestStake = lastStake.amount;
    uint256 reward = (latestStake * arp) / 10000;
    uint256 payout = latestStake + reward;
    // Remove the stake at the given index
    for (uint256 i = _index; i < stakes[msg.sender].length - 1; i++) {
      stakes[msg.sender][i] = stakes[msg.sender][i + 1];
    }
    stakes[msg.sender].pop();
    stakingBalance[msg.sender] -= latestStake;
    lastClaimTime[msg.sender] = block.timestamp;
    truthGPT.transfer(msg.sender, payout);
    emit Unstaked(msg.sender, payout, timeStaked);
  }

  function withdrawpenalty(uint256 _index) public nonReentrant {
    require(stakes[msg.sender].length > 0, 'No stakes found for the address');
    require(stakes[msg.sender].length >= _index + 1, 'Stake does not exist');
    uint256 lastStakeIndex = _index;
    Stake memory lastStake = stakes[msg.sender][lastStakeIndex];
    uint256 timeStaked = block.timestamp - lastStake.timestamp;
    uint256 latestStake = lastStake.amount;
    require(timeStaked <= minStakingPeriod, 'Withdraw with penalty time exceed you can now unstake token ');
    uint256 penalty = (latestStake * withdrawPenalty) / 100;
    // Remove the stake at the given index
    for (uint256 i = _index; i < stakes[msg.sender].length - 1; i++) {
      stakes[msg.sender][i] = stakes[msg.sender][i + 1];
    }
    stakes[msg.sender].pop();
    stakingBalance[msg.sender] -= latestStake;
    lastClaimTime[msg.sender] = block.timestamp;
    uint256 payout = latestStake - penalty;
    truthGPT.transfer(msg.sender, payout);
    emit Penalty(msg.sender, payout);
  }

  function claimReward() public nonReentrant {
    require(stakes[msg.sender].length > 0, 'No stakes found for the address');
    uint256 totalStaked = stakingBalance[msg.sender];
    uint256 lastClaim = lastClaimTime[msg.sender];
    uint256 timeElapsed = block.timestamp - lastClaim;
    require(timeElapsed > 0, 'No rewards to claim');
    uint256 reward = (totalStaked * (arp / 365) * (timeElapsed / 1 days)) / 100;
    require(reward > 0, 'Not Eligible for reward');
    lastClaimTime[msg.sender] = block.timestamp;
    truthGPT.transfer(msg.sender, reward);
    emit RewardClaimed(msg.sender, reward);
  }
}