lottery.sol

contract Lottery {

    //standard ERC20 staff
    //TODO: separate ERC20 token from this contract?

    uint public contestFinishTime; //dec 31

    //Lottery starts in OPEN state
    //then transiton to PICK_WINNER 
    //then to CLOSED
    enum LotteryStates {
        OPEN,
        PICK_WINNER,
        CLOSED,
        //...
    }

    //Give 5000 tokens to owner
    function Lottery() public {}

    //function to withdraw up to 50% of funds 
    function withdraw() payable onlyBy(owner) {}

    //called by creator to deposit eth without having tokens issued before contestFinishTime.
    function deposit() payable onlyBy(owner) {}

    //called by anyone to buy tokens before contestFinishTime
    function buyTokens() payable atState(LotteryStates.OPEN) {}

    //called by creator to send ETH to a selected address, this transition contract to WINNER_PICKED state
    function pickWinner(address winner) onlyBy(owner) atState(LotteryStates.PICK_WINNER) {}
}