// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 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
pragma solidity ^0.8.20;

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

contract Presale is ReentrancyGuard {
    address public owner;
    address public tokenAddress;
    uint256 public totalRaised; // Total amount of ETH raised
    bool public presaleActive = true;
    bool public claimEnabled = false;
    uint256 public softcap = 5 ether;  // Minimum amount to be raised for the presale to succeed (updated to 5 ETH)
    uint256 public hardcap = 50 ether; // Maximum amount that can be raised
    uint256 public minimumContribution = 0.05 ether; // Minimum contribution amount
    uint256 public totalTokensForPresale; // Total tokens allocated for presale
    uint8 public tokenDecimals = 18; // Token decimals
    mapping(address => uint256) public contributions; // Tracks how much ETH each address sent
    address[] public participants; // List of participants

    // Events
    event PresaleStarted();
    event PresaleEnded();
    event TokensClaimed(address indexed user, uint256 amount);
    event WithdrawnETH(address indexed recipient, uint256 amount);
    event SoftcapReached();
    event HardcapReached();
    event ClaimToggled(bool status);
    event TotalTokensForPresaleSet(uint256 totalTokens);

    // Modifiers
    modifier onlyOwner() {
        require(msg.sender == owner, "Only owner can call this function");
        _;
    }

    modifier presaleIsActive() {
        require(presaleActive, "Presale is not active");
        _;
    }

    modifier claimIsEnabled() {
        require(claimEnabled, "Claiming is not enabled");
        _;
    }

    constructor() {
        owner = msg.sender;
        // Set totalTokensForPresale to 150 million tokens (adjusted for decimals)
        totalTokensForPresale = 150_000_000 * (10 ** uint256(tokenDecimals));
        emit TotalTokensForPresaleSet(totalTokensForPresale);
    }

    function _processContribution(address contributor, uint256 amount) internal {
        require(amount >= minimumContribution, "Contribution must be at least the minimum amount");
        require(totalRaised + amount <= hardcap, "Cannot contribute, hardcap reached");

        if (contributions[contributor] == 0) {
            participants.push(contributor);
        }
        contributions[contributor] += amount;
        totalRaised += amount;

        if (totalRaised >= hardcap) {
            presaleActive = false;
            emit HardcapReached();
            emit PresaleEnded();
        }

        // Emit SoftcapReached event when the soft cap is reached for the first time
        if (totalRaised >= softcap && (totalRaised - amount) < softcap) {
            emit SoftcapReached();
        }
    }

    // Function to contribute to presale
    function contribute() external payable presaleIsActive nonReentrant {
        _processContribution(msg.sender, msg.value);
    }

    // Function to claim tokens after presale ends
    function claimTokens() external claimIsEnabled nonReentrant {
        uint256 ethContributed = contributions[msg.sender];
        require(ethContributed > 0, "No tokens to claim");
        require(totalRaised >= softcap, "Soft cap not reached, cannot claim tokens");
        require(tokenAddress != address(0), "Token address not set");

        // Calculate token amount based on contribution percentage
        uint256 tokenAmount = (ethContributed * totalTokensForPresale) / totalRaised;
        contributions[msg.sender] = 0;

        require(tokenAmount > 0, "Token amount is zero");

        IERC20(tokenAddress).transfer(msg.sender, tokenAmount);

        emit TokensClaimed(msg.sender, tokenAmount);
    }

    // Function to toggle presale on/off
    function togglePresale(bool status) external onlyOwner {
        presaleActive = status;
        if (presaleActive) {
            emit PresaleStarted();
        } else {
            emit PresaleEnded();
        }
    }

    // Function to enable or disable claim
    function toggleClaim(bool status) external onlyOwner {
        claimEnabled = status;
        emit ClaimToggled(status);
    }

    // Function to set the token contract address
    function setTokenAddress(address _tokenAddress) external onlyOwner {
        require(_tokenAddress != address(0), "Invalid token address");
        tokenAddress = _tokenAddress;
    }

    // Function for the owner to withdraw a specific amount of ETH to the given address
    function withdrawETH(address recipient, uint256 amount) external onlyOwner nonReentrant {
        require(!presaleActive, "Cannot withdraw ETH during active presale");
        require(recipient != address(0), "Invalid recipient address");
        require(amount > 0 && amount <= address(this).balance, "Invalid withdrawal amount");

        payable(recipient).transfer(amount);
        emit WithdrawnETH(recipient, amount);
    }

    // To receive ETH directly to the contract
    receive() external payable {
        require(presaleActive, "Presale is not active");
        _processContribution(msg.sender, msg.value);
    }
}

{
  "compilationTarget": {
    "contracts/presale.sol": "Presale"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}