Bet is a contract for betting on football matches between two teams

Bet.sol

pragma solidity ^0.4.17;

// Bet is a contract for betting on football matches between two teams
contract Bet {

	address public owner;

	struct Bets {
		address addr;
		uint    amount;
	}

	struct Team {
		bool   locked;
		string name;
		string image;
		Bets[] bets;
		uint   balance;
	}

	Team public A;
	Team public B;

	event NewBetA(address bidder, uint amount);
	event NewBetB(address bidder, uint amount);
	event NewWinner(address bidder, uint amount);

	modifier onlyowner {
		require(msg.sender == owner);
		_;
	}

	function Bet(string aname, string aimage, string bname, string bimage) public {
		owner = msg.sender;
		A.name = aname;
		A.image = aimage;
		A.locked = false;
		A.balance = 0;
		B.name = bname;
		B.image = bimage;
		B.locked = false;
		B.balance = 0;
	}

	function bet(uint choice) public payable {
		require(choice == 0 || choice == 1);
		require(msg.value > 0);
		require(A.locked == false);
		require(B.locked == false);

		uint amount = msg.value;
		uint idx;
		if (choice == 0) { // 0=A
			A.balance += msg.value;
			idx = A.bets.length;
			A.bets.length += 1;
			A.bets[idx].addr = msg.sender;
			A.bets[idx].amount = amount;
			NewBetA(msg.sender, msg.value);
		} else {          // 1=B
			B.balance += amount;
			idx = B.bets.length;
			B.bets.length += 1;
			B.bets[idx].addr = msg.sender;
			B.bets[idx].amount = amount;
			NewBetB(msg.sender, msg.value);
		}	

	}

	function lock() public onlyowner {
		A.locked = true;
		B.locked = true;
	}

	function unlock() public onlyowner {
		A.locked = false;
		B.locked = false;
	}

	function returnMoney() public onlyowner {
		lock();

		for (uint i = 0; i < A.bets.length; i++) {
			A.bets[i].addr.transfer(A.bets[i].amount);			
		}

		for (i = 0; i < B.bets.length; i++) {
			B.bets[i].addr.transfer(B.bets[i].amount);			
		}
	}

	function payWinners(uint choice) public onlyowner {
		require(choice == 0 || choice == 1);

		uint collected = 0;	
		var winBalance = (choice == 0) ? A.balance : B.balance;
		var lostBalance = (choice == 0) ? B.balance : A.balance;
		var winnerBets = (choice == 0) ? A.bets : B.bets;

		for (uint i = 0; i < winnerBets.length; i++) {
			uint extra = winnerBets[i].amount * (lostBalance/winBalance);
			uint amount = winnerBets[i].amount + extra;
			if (!winnerBets[i].addr.send(amount)) {
				collected += amount;
			} else {
				NewWinner(winnerBets[i].addr, amount);
			}
		}

		if (collected != 0) {
			owner.transfer(collected);
		}

		// lock the teams
		lock();
	}

	function setOwner(address _owner) public onlyowner {
		owner = _owner;
	}
}

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