// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract DoggyAiStake is Ownable, ReentrancyGuard {
    IERC20 public stakingToken;
    bool public isEarlyWithdrawal;
    uint256 public minStake = 10 * 10 ** 18;
    uint256 public stakePeriod;
    uint256 public totalStaked;
    uint public constantTotalFunds;
    uint public totalFund;
    uint public rewardRate;

    event Staked(address indexed, uint256 amount);
    event Claimed(address indexed, uint256 amount);
    event Withdrawn(address indexed, uint256 amount);
    event PoolRefilled(
        address indexed,
        uint256 amount,
        bool isEarlyWithdral,
        uint256 newStakePeriod,
        uint256 amountMinStake
    );

    struct Stake {
        uint256 amount;
        uint256 startTime;
        uint256 lastClaimTimestamp;
    }

    mapping(address => uint256) public userTotalStaked;
    mapping(address => Stake[]) public stakes;

    modifier _checkRewardRate() {
        if (totalStaked == 0) {
            rewardRate = ((totalFund / stakePeriod) / minStake);
            if (rewardRate == 0) {
                rewardRate = 1;
            }
        } else {
            rewardRate = ((totalFund / stakePeriod) / totalStaked);
            if (rewardRate == 0) {
                rewardRate = 1;
            }
        }
        _;
    }

    constructor(
        address DoggyAi,
        address initialOwner,
        uint256 _stakePeriod,
        uint amountToFill
    ) Ownable(initialOwner) {
        stakingToken = IERC20(DoggyAi);
        isEarlyWithdrawal = false;
        stakePeriod = _stakePeriod * 1 days;
        constantTotalFunds = amountToFill;
        totalFund = constantTotalFunds;
        rewardRate = (((totalFund / stakePeriod) / 10) * 10 ** 18);
        if (rewardRate == 0) {
            rewardRate = 1;
        }
    }

    function getStakes(
        address user,
        uint stakesIndex
    ) public view returns (Stake memory) {
        return stakes[user][stakesIndex];
    }

    function calculateReward(
        address userAddress,
        uint256 stakeIndex
    ) public view returns (uint256) {
        Stake storage userStake = stakes[userAddress][stakeIndex];
        uint256 elapsedSeconds = block.timestamp - userStake.lastClaimTimestamp;
        return (userStake.amount * elapsedSeconds * rewardRate);
    }

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

    function stake(uint256 _amount) public _checkRewardRate {
        require(
            _amount >= minStake,
            "The amount must be greater than minimum 10 tokens"
        );

        userTotalStaked[msg.sender] += _amount;
        stakes[msg.sender].push(
            Stake(_amount, block.timestamp, block.timestamp)
        );
        require(
            stakingToken.transferFrom(msg.sender, address(this), _amount),
            "Token transfer failed"
        );
        totalStaked += _amount;
        emit Staked(msg.sender, _amount);
    }

    function calculatePoolPercentage() external view returns (uint256) {
        return (totalFund / constantTotalFunds) * 100;
    }

    function claimReward(uint256 stakeIndex) internal {
        Stake storage userStake = stakes[msg.sender][stakeIndex];
        uint256 rewardAmount = calculateReward(msg.sender, stakeIndex);

        require(rewardAmount > 0, "No reward available");
        require(rewardAmount <= totalFund, "Not enough funds in contract");

        userStake.lastClaimTimestamp = block.timestamp;

        require(
            stakingToken.transfer(msg.sender, rewardAmount),
            "Token transfer failed"
        );
        unchecked {
            totalFund -= rewardAmount;
        }

        emit Claimed(msg.sender, rewardAmount);
    }

    function claimAllRewards() external nonReentrant _checkRewardRate {
        require(isEarlyWithdrawal, "Early claim is not allowed");
        Stake[] memory userStakes = stakes[msg.sender];
        for (uint256 i; i < userStakes.length; i++) {
            rewardRate = ((totalFund / stakePeriod) / totalStaked);
            if (rewardRate == 0) {
                rewardRate = 1;
            }
            claimReward(i);
        }
    }

    function claimAndStake() public nonReentrant _checkRewardRate {
        require(isEarlyWithdrawal, "Early claim is not allowed");
        Stake[] memory userStakes = stakes[msg.sender];
        for (uint256 i; i < userStakes.length; i++) {
            uint reward = calculateReward(msg.sender, i);
            require(reward > 0, "No reward available");
            require(
                userStakes[i].amount + reward <= totalFund,
                "Not enough funds in contract"
            );
            totalFund -= reward;
            totalStaked += reward;
            userTotalStaked[msg.sender] += reward;

            stakes[msg.sender].push(
                Stake(reward, block.timestamp, block.timestamp)
            );
        }
    }

    function withdraw() public nonReentrant _checkRewardRate {
        Stake[] storage userStake = stakes[msg.sender];
        uint i;
        for (i; i < userStake.length; i++) {
            if (userStake[i].amount <= 0) {
                revert("The amount must be greater than minimum 10 tokens");
            }
            require(isEarlyWithdrawal, "Early withdrawal is not allowed");
            uint256 rewardAmount = calculateReward(msg.sender, i);
            require(
                stakingToken.transfer(
                    msg.sender,
                    userStake[i].amount + rewardAmount
                ),
                "Token transfer failed"
            );
            userTotalStaked[msg.sender] -= userStake[i].amount;
            totalStaked -= userStake[i].amount;
            totalFund -= rewardAmount;
            emit Withdrawn(msg.sender, userStake[i].amount + rewardAmount);
            delete stakes[msg.sender];
        }
    }

    function refillPool(
        uint256 amountToRefill,
        bool isLock,
        uint256 newStakePeriod,
        uint256 newMinStake
    ) public onlyOwner {
        require(
            newStakePeriod > 0,
            "New stake period should be greater than 0"
        );
        require(amountToRefill > 0, "Amount to refill must be greater than 0");
        require(
            stakingToken.transferFrom(
                msg.sender,
                address(this),
                amountToRefill
            ),
            "Your transaction is not valid"
        );
        toggleEarlyWithdrawal(isLock);
        stakePeriod = newStakePeriod * 1 days;
        setMinStake(minStake);
        constantTotalFunds = amountToRefill + totalFund;
        totalFund = constantTotalFunds;
        if (totalStaked == 0) {
            rewardRate = ((totalFund / stakePeriod) / minStake);
            if (rewardRate == 0) {
                rewardRate = 1;
            }
            emit PoolRefilled(
                msg.sender,
                amountToRefill,
                isLock,
                newStakePeriod,
                newMinStake
            );
        } else {
            rewardRate = ((totalFund / stakePeriod) / totalStaked);
            if (rewardRate == 0) {
                rewardRate = 1;
            }
            emit PoolRefilled(
                msg.sender,
                amountToRefill,
                isLock,
                newStakePeriod,
                newMinStake
            );
        }
    }

    function toggleEarlyWithdrawal(bool _isEarlyWithdrawal) public onlyOwner {
        isEarlyWithdrawal = _isEarlyWithdrawal;
    }

    function setMinStake(uint256 newMinStake) public onlyOwner {
        minStake = newMinStake;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

{
  "compilationTarget": {
    "contracts/DoggyAiStaking.sol": "DoggyAiStake"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "details": {
      "constantOptimizer": true,
      "cse": true,
      "deduplicate": true,
      "inliner": true,
      "jumpdestRemover": true,
      "orderLiterals": true,
      "peephole": true,
      "yul": true,
      "yulDetails": {
        "optimizerSteps": "u:fDnTOc",
        "stackAllocation": true
      }
    },
    "runs": 200
  },
  "remappings": [],
  "viaIR": true
}