GuessGame2.sol

GuessGame2.sol

pragma solidity ^0.4.19;
contract GuessGame2  {
    
    mapping(address => uint) ans;
    mapping(address => address) opp;
    mapping(address => uint) bal;
    address unmatched_player;
    
    /**
     * Constructs funcion.
     */    
	function GuessGame2() internal{
	}
	
	/**
	 * Join a new game. 
	 */
    event NewRoom(address p, uint z); // Player p create with a new room with answer z.
    event JoinRoom(address p1, address p2, uint z); // Player p1 join player p2's room with answer z.
	function join(uint z) payable public{
	    require(opp[msg.sender] == 0);
	    require(msg.value > 10);
	    ans[msg.sender] = z;
	    bal[msg.sender] = msg.value;
	    if (unmatched_player != 0) {
	        opp[msg.sender] = unmatched_player;
	        opp[unmatched_player] = msg.sender;
	        JoinRoom(msg.sender, unmatched_player, z);
	        unmatched_player = 0;
	    } else {
	        unmatched_player = msg.sender;
	        NewRoom(msg.sender, z);
	    }
	}
	
	/**
	 * Make a guess. 
	 */	
    event Guess(address p, uint s); // Player p make a guess s.
    event WrongAnswer(address p, int z); // Player p get a WrongAnswer with hint z.
    event Accepted(address p, uint z); // Player p get Accepted and won z as reward.    
	function guess(uint s) public payable returns (int z){
		require(msg.value >= 10);    
	    require(opp[msg.sender] != 0);
	    Guess(msg.sender, s);
	    uint t = ans[opp[msg.sender]];
	    if (s < t) {
	        WrongAnswer(msg.sender, -1);
	        return -1;
	    } else if (s > t) {
	        WrongAnswer(msg.sender, 1);
	        return 1;
	    } else {
	        t = bal[msg.sender] + bal[opp[msg.sender]];
	        bal[msg.sender] = 0;
	        bal[opp[msg.sender]] = 0;
	        opp[opp[msg.sender]] = 0;
	        opp[msg.sender] = 0;
	        msg.sender.transfer(t);
	        Accepted(msg.sender, t);
	        return 0;
	    }
	}
}