pragma solidity ^0.8.0;

contract RandomRewardPool {
    address[] public participants;
    uint public totalAmount;

    constructor() {
        totalAmount = 0;
    }

    function joinPool() public payable {
        require(msg.value > 0, "Katılım ücreti gereklidir.");
        participants.push(msg.sender);
        totalAmount += msg.value;
    }

    function distributeRewards() public {
        require(participants.length >= 3, "En az 3 katılımcı gereklidir.");

        uint reward1 = (totalAmount * 50) / 100;  // Birinciye %50
        uint reward2 = (totalAmount * 30) / 100;  // İkinciye %30
        uint reward3 = (totalAmount * 20) / 100;  // Üçüncüye %20

        uint[] memory randomIndexes = generateRandomIndexes();

        payable(participants[randomIndexes[0]]).transfer(reward1);
        payable(participants[randomIndexes[1]]).transfer(reward2);
        payable(participants[randomIndexes[2]]).transfer(reward3);
        
        // Havuzu sıfırla
        participants = new address[](0);
        totalAmount = 0;
    }

    function generateRandomIndexes() private view returns (uint[] memory) {
        uint[] memory indexes = new uint[](3);

        // Rasgele indeksleri oluştur
        for (uint i = 0; i < 3; i++) {
            indexes[i] = uint(keccak256(abi.encodePacked(block.difficulty, block.timestamp, i))) % participants.length;
        }

        return indexes;
    }
}