// Sources flattened with hardhat v2.17.0 https://hardhat.org

// File @openzeppelin/contracts/utils/Context.sol@v4.9.3

// 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 @openzeppelin/contracts/access/Ownable.sol@v4.9.3

// e-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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/security/ReentrancyGuard.sol@v4.9.3

// e-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 contracts/Lock.sol

// e-Identifier: MIT
pragma solidity ^0.8.0;


contract Lock is Ownable, ReentrancyGuard {
    struct VestingPeriod {
        uint256 startTime;
        uint256 releaseTime;
        uint256 totalTokens;
        uint256 releasedTokens;
        uint256 initialReleaseAmount;
        uint256 staticinitialReleaseAmount;
        uint256 currentDuration;

        bool isInitialized;
        bool isRefunded;
    }

    // Address of the token contract
    address public tokenContract;

    // Address of the beneficiary who will receive the tokens
    address public beneficiary;

    // Number of months over which 90% locked tokens will be released
    uint256 public constant releaseDuration = 11;

    VestingPeriod[3] public vestingPeriods;
    // Constructor
    constructor(
        address _tokenContract,
        address _beneficiary,
        uint256 _totalTokens
    ) {
        tokenContract = _tokenContract;
        beneficiary = _beneficiary;

        uint256 initialReleaseAmount = _totalTokens * 10 / 100;
        uint256 _vestingTokens = _totalTokens - initialReleaseAmount;

        vestingPeriods[0] = VestingPeriod(
            0,
            0,
            _vestingTokens / 3,
            0,
            initialReleaseAmount /3,
            initialReleaseAmount /3,
            1,
            false,
            false
        );

        vestingPeriods[1] = VestingPeriod(
            0,
            0,
            _vestingTokens / 3,
            0,
            initialReleaseAmount /3,
            initialReleaseAmount /3,
            1,
            false,
            false
        );

        vestingPeriods[2] = VestingPeriod(
            0,
            0,
            _vestingTokens / 3,
            0,
            initialReleaseAmount /3,
            initialReleaseAmount /3,
            1,
            false,
            false
        );
    }

    function startVesting(
        uint256 vestingId
    ) external onlyOwner {
        require(vestingId < vestingPeriods.length, "Invalid vesting ID");
        VestingPeriod storage vesting = vestingPeriods[vestingId];
        require(!vesting.isInitialized, "Vesting already initialized");
        require(!vesting.isRefunded, "Vesting already refunded");
        vesting.startTime = block.timestamp;
        vesting.releaseTime = block.timestamp + 730 days;
        vesting.isInitialized = true;
    }

    function refundVesting(
        uint256 vestingId
    ) external onlyOwner {
        require(vestingId < vestingPeriods.length, "Invalid vesting ID");
        VestingPeriod storage vesting = vestingPeriods[vestingId];
        require(!vesting.isInitialized, "Vesting already initialized");
        require(!vesting.isRefunded, "Vesting already refunded");
        vesting.isRefunded = true;
        IERC20(tokenContract).transfer(msg.sender, vesting.totalTokens + vesting.initialReleaseAmount);
    }

    function releaseInitialTokens(uint256 vestingId) external nonReentrant {
        require(msg.sender == beneficiary, "You aren't the owner");
        VestingPeriod storage vesting = vestingPeriods[vestingId];
        require(vesting.isInitialized, "Vesting period not initialized");
        require(vesting.initialReleaseAmount > 0, "Vesting period ended");
        vesting.releasedTokens += vesting.initialReleaseAmount;
        IERC20(tokenContract).transfer(beneficiary, vesting.initialReleaseAmount);
        vesting.initialReleaseAmount = 0;
    }
    // Function to release tokens after the lock-up period
    function releaseTokens(uint256 vestingId) external nonReentrant returns (bool) {
        require(msg.sender == beneficiary, "You aren't the owner");
        VestingPeriod storage vesting = vestingPeriods[vestingId];
        require(vesting.isInitialized, "Vesting period not initialized");
        require(vesting.currentDuration <= 12, "Vesting period ended");
        require(block.timestamp >= vesting.releaseTime, "Tokens are still locked.");

        if(vesting.currentDuration > releaseDuration && (vesting.totalTokens - vesting.releasedTokens) > 0) {
            require(block.timestamp >= vesting.releaseTime +  (12 * 30 days), "Tokens are still locked.");
            vesting.currentDuration = 13;
            // Release remaining tokens on the 12th month
            IERC20(tokenContract).transfer(beneficiary, (vesting.totalTokens + vesting.staticinitialReleaseAmount) - vesting.releasedTokens);
            return true;
        }

        uint256 monthlyReleaseAmount = vesting.totalTokens * 7 / 100;

        // Release 7% tokens every month for 11 months
        for (uint256 i = vesting.currentDuration; i <= releaseDuration; i++) {
            uint256 releaseMonth = vesting.releaseTime + (i * 30 days);
            if (block.timestamp >= releaseMonth) {
                vesting.currentDuration = i+1;
                vesting.releasedTokens += monthlyReleaseAmount;
                IERC20(tokenContract).transfer(beneficiary, monthlyReleaseAmount);
            }
        }
        return true;
    }
}

// Interface for the ERC-20 token contract
interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}