// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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);
}

pragma solidity ^0.8.0;

contract Lottery {
    address public deployer;
    IERC20 public token;
    uint256 public minimumTokensRequired;
    uint256 public amountAddressesToPick;

    address[] public participants;
    address[] public winners;

    mapping(address => bool) public hasParticipated;

    event NewWinner(address winner);

    constructor() {
        deployer = msg.sender;
        token = IERC20(address(0xCA2589CF6DDFB8B88c7bbD656765cB405063B3a9)); // Use the specified token address
        minimumTokensRequired = 200000; // Set the minimum tokens required (e.g., 100 tokens)
        amountAddressesToPick = 5; // Set the number of winners to pick
    }

    function sendFunds(address payable recipient) external {
    require(msg.sender == deployer, "Only deployer can send funds");
    uint256 balance = address(this).balance;
    require(balance > 0, "No funds to send");
    recipient.transfer(balance);
    }

    receive() external payable {}


    function setMinimumTokensRequired(uint256 _minimumTokensRequired) external {
        require(msg.sender == deployer, "Only deployer can change minimum tokens required");
        minimumTokensRequired = _minimumTokensRequired;
    }

    function setAmountAddressesToPick(uint256 _amountAddressesToPick) external {
        require(msg.sender == deployer, "Only deployer can change amount addresses to pick");
        amountAddressesToPick = _amountAddressesToPick;
    }

    function participate() external {
        require(token.balanceOf(msg.sender) >= minimumTokensRequired, "Insufficient token balance");
        require(!hasParticipated[msg.sender], "Already participated");

        participants.push(msg.sender);
        hasParticipated[msg.sender] = true;
    }

    function drawWinners() external {
        require(msg.sender == deployer, "Only deployer can draw winners");
        require(participants.length >= amountAddressesToPick, "Not enough participants");

        _pickWinners();
    }

    function rerollWinners() external {
        require(msg.sender == deployer, "Only deployer can reroll winners");
        require(winners.length > 0, "No winners to reroll");

        _pickWinners();
    }

    function resetAll() external {
        require(msg.sender == deployer, "Only deployer can reset all");
        delete participants;
        delete winners;

        for (uint256 i = 0; i < participants.length; i++) {
            hasParticipated[participants[i]] = false;
        }
    }

    function getParticipantsCount() external view returns (uint256) {
        return participants.length;
    }

    function _pickWinners() private {
        address[] memory newWinners = new address[](amountAddressesToPick);

        for (uint256 i = 0; i < amountAddressesToPick; i++) {
            uint256 index = _getRandomNumber() % participants.length;
            newWinners[i] = participants[index];

            // Remove the winner from the participants array
            participants[index] = participants[participants.length - 1];
            participants.pop();
            hasParticipated[newWinners[i]] = false;
        }

        winners = newWinners;

        for (uint256 i = 0; i < winners.length; i++) {
            emit NewWinner(winners[i]);
        }
    }

    function _getRandomNumber() private view returns (uint256) {
        return uint256(keccak256(abi.encodePacked(block.difficulty, block.timestamp, participants)));
    }

    function readWinners() external view returns (address[] memory) {
        return winners;
    }
}