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contract BTCRelay{ | |
function getLastBlockHeight() public returns(int256); | |
function getBlockHash(int256) public returns(int256); | |
} | |
contract Powerball{ | |
mapping(address => uint8[6][]) public tickets; | |
mapping(address => uint) public balances; | |
uint public roundStart; | |
uint public constant roundLength = 3 days; | |
bool roundOver = false; | |
enum Phase {Bet,Draw,Claim} | |
Phase currentPhase = Phase.Bet; | |
uint8[6] public balls; | |
BTCRelay relay; | |
uint public constant houseEdge = 1; //percent of each ticket | |
address house; | |
uint houseFunds; | |
int256 firstBlock; | |
function Powerball(address relayAddress){ | |
relay = BTCRelay(relayAddress); | |
roundStart = block.timestamp; | |
house = msg.sender; | |
} | |
function buyTicket(uint8[6] numbers){ | |
if(startDraw()) throw; | |
if(!checkNumbers(numbers)) throw; | |
if(msg.value < 2 ether) throw; | |
for(uint16 i = 0; i < msg.value/2; i++){ | |
tickets[msg.sender].push(numbers); | |
} | |
houseFunds += msg.value/100; | |
} | |
function startDraw() returns(bool){ | |
if(block.timestamp > roundStart + roundLength){ | |
if(currentPhase == Phase.Bet){ | |
currentPhase = Phase.Draw; | |
firstBlock = relay.getLastBlockHeight() + 2; | |
} | |
return false; | |
} | |
return true; | |
} | |
function checkNumbers(uint8[6] numbers) returns (bool){ | |
for(var i = 0; i <6; i++){ | |
if (numbers[i] > 69 || numbers[i] <1) return false; | |
} | |
if(numbers[5]>26) return false; | |
return true; | |
} | |
function getBall(uint8 ball) returns(uint8){ | |
if(balls[ball] != 0) return balls[ball]; | |
if(ball > 5) throw; | |
if (relay.getLastBlockHeight() < 8+ball+firstBlock) throw; | |
int256 hash = relay.getBlockHash(firstBlock + ball); | |
if (hash == 0) throw; | |
else if(ball !=5) balls[ball] = uint8(hash) % 69 +1; | |
else balls[ball] = uint8(hash)%26+1; | |
} | |
function getPayout() public returns(uint){ | |
if (currentPhase == Phase.Draw){ | |
for(uint8 i; i<6; i++){ | |
if(balls[i] == 0) throw; | |
} | |
currentPhase = Phase.Claim; | |
} | |
else if (currentPhase == Phase.Bet) throw; | |
uint payout; | |
for(uint ticket; ticket<tickets[msg.sender].length; ticket++){ | |
uint8 matches; | |
bool powerBall = false; | |
for(uint8 ball; ball < 5; ball++){ | |
for(uint8 draw; draw < 5; draw++){ | |
if(tickets[msg.sender][ticket][ball] == balls[draw]){ | |
matches++; | |
} | |
} | |
} | |
} | |
} | |
} |
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