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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

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

contract LooterPresale {
    address immutable owner;
    IERC20 public token;
    uint256 public presaleStage = 0; // 0: not started, 1: round one, 2: round two, 3: ended, 4: claim active

    uint256 public constant slotTokenAmount = 0.2 * 100_000_000 * 1e18;
    uint256 public constant slotETHAmount = 0.4 ether;
    uint256 public constant cap = 30 ether;

    mapping(address => uint256) public whitelist;
    mapping(address => uint256) public contributions;

    constructor() {
        owner = msg.sender;
    }

    function setToken(address token_) external {
        require(msg.sender == owner, "not owner");
        token = IERC20(token_);
    }

    function setWhitelist(
        address[] memory participants,
        uint256 round
    ) external {
        require(msg.sender == owner, "not owner");
        for (uint256 i = 0; i < participants.length; i++) {
            whitelist[participants[i]] = round;
        }
    }

    function setPresaleStage(uint256 newStage) external {
        require(msg.sender == owner, "not owner");
        presaleStage = newStage;
    }

    function withdrawTokensByOwner() external {
        require(msg.sender == owner, "not owner");
        token.transfer(owner, token.balanceOf(address(this)));
    }

    function withdrawEtherByOwner() external {
        require(msg.sender == owner, "not owner");
        payable(owner).transfer(address(this).balance);
    }

    function claim() external {
        require(presaleStage == 4, "claim not active");
        uint256 tokenAmount = (contributions[msg.sender] * slotTokenAmount) /
            slotETHAmount;
        IERC20(token).transfer(msg.sender, tokenAmount);
    }

    receive() external payable {
        require(presaleStage > 0, "presale not active");
        require(presaleStage < 3, "presale ended");
        require(address(this).balance <= cap, "presale cap reached");
        require(
            whitelist[msg.sender] == presaleStage,
            "not whitelisted for this round"
        );

        uint256 contribution = contributions[msg.sender] + msg.value;
        contributions[msg.sender] = contribution;

        require(contribution >= 0.1 ether, "0.1 ETH minimum");
        require(contribution <= slotETHAmount, "slot allowance exceeded");
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

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

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"cap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"contributions","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"presaleStage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newStage","type":"uint256"}],"name":"setPresaleStage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token_","type":"address"}],"name":"setToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"participants","type":"address[]"},{"internalType":"uint256","name":"round","type":"uint256"}],"name":"setWhitelist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"slotETHAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"slotTokenAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"whitelist","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawEtherByOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawTokensByOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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