// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.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);
    }
}

// yeetzejeet.com

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import "lib/openzeppelin-contracts/contracts/access/Ownable.sol";

contract YeetPresale is Ownable {
    bool public presaleStarted;
    bool public presaleEnded;

    mapping(address => uint256) public amountPurchased;
    uint256 public totalPurchased;
    address[] public participants;

    uint256 public walletLimit = 0.2 ether;
    uint256 public tokensPerEth = 80_000e18;
    uint256 public hardCap = 10 ether;
    address public tokenAddress;

    event BoughtPresale(address indexed participant, uint256 ethAmount);
    event Claimed(address indexed participant, uint256 tokenAmount);

    function buyPresale() external payable {
        require(presaleStarted, "Presale not started yet");
        require(!presaleEnded, "Presale ended");
        require(msg.value > 0, "Zero amount");
        require(amountPurchased[msg.sender] + msg.value <= walletLimit, "Over wallet limit");
        require(totalPurchased + msg.value <= hardCap, "Amount over limit");
        if (amountPurchased[msg.sender] == 0) participants.push(msg.sender);
        amountPurchased[msg.sender] += msg.value;
        totalPurchased += msg.value;
        emit BoughtPresale(msg.sender, msg.value);
    }

    function claim() external {
        require(presaleEnded, "Not claimable");
        require(amountPurchased[msg.sender] > 0, "No amount claimable");
        require(tokenAddress != address(0), "Nothing to claim yet");
        uint256 amount = amountPurchased[msg.sender] * tokensPerEth / 1e18;
        amountPurchased[msg.sender] = 0;
        IERC20(tokenAddress).transfer(msg.sender, amount);
        emit Claimed(msg.sender, amount);
    }

    function startPresale(bool hasStarted) external onlyOwner {
        presaleStarted = hasStarted;
    }

    function endPresale(bool hasEnded) external onlyOwner {
        presaleEnded = hasEnded;
    }

    function setHardCap(uint256 _hardCap) external onlyOwner {
        hardCap = _hardCap;
    }

    function setWalletLimit(uint256 _walletLimit) external onlyOwner {
        walletLimit = _walletLimit;
    }

    function setTokensPerEth(uint256 _tokensPerEth) external onlyOwner {
        tokensPerEth = _tokensPerEth;
    }

    function setTokenAddress(address _tokenAddress) external onlyOwner {
        tokenAddress = _tokenAddress;
    }

    function withdrawEth() external onlyOwner {
        uint256 totalAmount = address(this).balance;
        (bool success,) = owner().call{value: totalAmount}("");
        require(success);
    }

    function withdrawTokens(uint256 amount) external onlyOwner {
        IERC20(tokenAddress).transfer(owner(), amount);
    }

    function refundEth() external onlyOwner {
        uint256 participantCount = participants.length;
        for (uint256 i = 0; i < participantCount;) {
            uint256 ethAmount = amountPurchased[participants[i]];
            amountPurchased[participants[i]] = 0;
            (bool success,) = participants[i].call{value: ethAmount}("");
            require(success);
            unchecked {
                i++;
            }
        }
    }

    function getParticipantsCount() public view returns (uint256 count) {
        return participants.length;
    }
}

{
  "compilationTarget": {
    "src/Presale.sol": "YeetPresale"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":ds-test/=lib/forge-std/lib/ds-test/src/",
    ":forge-std/=lib/forge-std/src/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "lib/forge-std:ds-test/=lib/forge-std/lib/ds-test/src/"
  ]
}