RockPaperScissors.sol

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

contract RockPaperScissors {
    // game state
    address public owner;
    address public player;
    string private pMove;
    string private cMove;
    string public gameResult;
  	bool private gameStatus;
    
    // events
    event GameStarted(address player);
    event MoveMade(bytes32 playerMove);
    event GameEnded(string gameResult);
        
    // variables, mappings, arrays
    string[] private choices = ["rock", "paper", "scissors"];
    mapping(address => uint) public balances;
    
    // constructor
    constructor() {
        owner = msg.sender;
    }

    // functions
    function deposit() public payable {
        require(msg.value > 0, "Deposit amount must be greater than 0");
        // require(msg.sender == player, "Only the player can deposit funds.");
        balances[msg.sender] += msg.value;
    }


    function startGame() public {
        // require(msg.sender == owner, "Only the owner can start a game.");
        require(balances[msg.sender] > 1 ether, "Not enough balance to start the game.");
        
        balances[msg.sender]-= 1 ether;
        player = msg.sender;
        emit GameStarted(player);
    }

    
    function makeMove(string memory _pMove) public {
        require(msg.sender == player, "Only the player can make a move.");

        // player move
        bytes memory _playerMove = bytes(_pMove);
        bytes32 playerMove;

        assembly {
            playerMove := mload(add(_playerMove, 32))
        }
            
        emit MoveMade(playerMove);

        // computer move
        cMove = choices[uint(keccak256(abi.encodePacked(block.timestamp, block.difficulty))) % 3];
        
        bytes memory _computerMove = bytes(cMove);
        bytes32 computerMove;

        assembly {
            computerMove := mload(add(_computerMove, 32))
        }

        emit MoveMade(computerMove);

        if (playerMove == computerMove) {  
            gameResult = "Tie";
        } else if (
            (playerMove == "rock" && computerMove == "scissors") ||
            (playerMove == "scissors" && computerMove == "paper") ||
            (playerMove == "paper" && computerMove == "rock")
        ) {
            gameResult = "You Win!";
        } else {
            gameResult = "You lose!";
        }
        emit GameEnded(gameResult);
    }

    function getChoices() public view returns(string[] memory) {
        return choices;
    }
}