// Vulnerability label: overflow
pragma solidity ^0.4.24;

/*
*
*__/\\\\\\\\\\\\\__________________________________________________/\\\\\\\\\\\\\______________________________________________
* _\/\\\/////////\\\_______________________________________________\/\\\/////////\\\_______________________________/\\\_________
*  _\/\\\_______\/\\\__/\\\___/\\\\\\\\____/\\\\\\\\_____/\\\__/\\\_\/\\\_______\/\\\______________________________\/\\\_________
*   _\/\\\\\\\\\\\\\/__\///___/\\\////\\\__/\\\////\\\___\//\\\/\\\__\/\\\\\\\\\\\\\\___/\\\\\\\\\_____/\\/\\\\\\___\/\\\\\\\\____
*    _\/\\\/////////_____/\\\_\//\\\\\\\\\_\//\\\\\\\\\____\//\\\\\___\/\\\/////////\\\_\////////\\\___\/\\\////\\\__\/\\\////\\\__
*     _\/\\\_____________\/\\\__\///////\\\__\///////\\\_____\//\\\____\/\\\_______\/\\\___/\\\\\\\\\\__\/\\\__\//\\\_\/\\\\\\\\/___
*      _\/\\\_____________\/\\\__/\\_____\\\__/\\_____\\\__/\\_/\\\_____\/\\\_______\/\\\__/\\\/////\\\__\/\\\___\/\\\_\/\\\///\\\___
*       _\/\\\_____________\/\\\_\//\\\\\\\\__\//\\\\\\\\__\//\\\\/______\/\\\\\\\\\\\\\/__\//\\\\\\\\/\\_\/\\\___\/\\\_\/\\\_\///\\\_
*        _\///______________\///___\////////____\////////____\////________\/////////////_____\////////\//__\///____\///__\///____\///__
*/

library SafeMath {
    function mul(uint256 _a, uint256 _b) internal pure returns(uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (_a == 0) {
            return 0;
        }

        uint256 c = _a * _b;
        require(c / _a == _b);

        return c;
    }

    function div(uint256 _a, uint256 _b) internal pure returns(uint256) {
        require(_b > 0); // Solidity only automatically asserts when dividing by 0
        uint256 c = _a / _b;
        // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold

        return c;
    }

    function sub(uint256 _a, uint256 _b) internal pure returns(uint256) {
        require(_b <= _a);
        uint256 c = _a - _b;

        return c;
    }

    function add(uint256 _a, uint256 _b) internal pure returns(uint256) {
        uint256 c = _a + _b;
        require(c >= _a);

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns(uint256) {
        require(b != 0);
        return a % b;
    }
}

contract Ownable {
    address public owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    function Ownable() public {
        owner = msg.sender;
    }

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

    modifier onlyThisOwner(address _owner) {
        require(owner == _owner);
        _;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

}

contract Betting {

    uint8 public constant betsCount = 28;
    uint8 public constant betKillCount = 2;
    struct Bet {
        uint256 minSum;     // min value eth for choose this bet
        uint256 cooldown;   // time for reset timer
    }

    Bet[] public bets;

    constructor() public {
        bets.push(Bet(0.01 ether, 86400));  // 24 hour
        bets.push(Bet(0.02 ether, 82800));  // 23 hour
        bets.push(Bet(0.03 ether, 79200));  // 22 hour
        bets.push(Bet(0.04 ether, 75600));  // 21 hour
        bets.push(Bet(0.05 ether, 72000));  // 20 hour
        bets.push(Bet(0.06 ether, 68400));  // 19 hour
        bets.push(Bet(0.07 ether, 64800));  // 18 hour
        bets.push(Bet(0.08 ether, 61200));  // 17 hour
        bets.push(Bet(0.09 ether, 57600));  // 16 hour
        bets.push(Bet(0.1 ether, 54000));   // 15 hour
        bets.push(Bet(0.11 ether, 50400));  // 14 hour
        bets.push(Bet(0.12 ether, 46800));  // 13 hour
        bets.push(Bet(0.13 ether, 43200));  // 12 hour
        bets.push(Bet(0.14 ether, 39600));  // 11 hour
        bets.push(Bet(0.15 ether, 36000));  // 10 hour
        bets.push(Bet(0.16 ether, 32400));  // 9 hour
        bets.push(Bet(0.17 ether, 28800));  // 8 hour
        bets.push(Bet(0.18 ether, 25200));  // 7 hour
        bets.push(Bet(0.19 ether, 21600));  // 6 hour
        bets.push(Bet(0.2 ether, 18000));   // 5 hour
        bets.push(Bet(0.21 ether, 14400));  // 4 hour
        bets.push(Bet(0.22 ether, 10800));  // 3 hour
        bets.push(Bet(0.25 ether, 7200));   // 2 hour
        bets.push(Bet(0.5 ether, 3600));    // 1 hour
        bets.push(Bet(1 ether, 2400));      // 40 min
        bets.push(Bet(5 ether, 1200));      // 20 min
        bets.push(Bet(10 ether, 600));      // 10 min
        bets.push(Bet(50 ether, 300));      // 5 min
    }

    function getBet(uint256 _betIndex) public view returns(uint256, uint256) {
        Bet memory bet = bets[_betIndex];
        return (bet.minSum, bet.cooldown);
    }

    function getBetIndex(uint256 _sum) public view returns(uint256) {
        for (uint256 i = betsCount - 1; i >= 0; i--) {
            if (_sum >= bets[i].minSum) return i;
        }

        revert('Bet not found');
    }

    function getMinBetIndexForKill(uint256 _index) public view returns(uint256) {
        if (_index < betKillCount) return 0;

        return _index - betKillCount;
    }

}

contract PiggyBank is Ownable, Betting {

    using SafeMath for uint256;

    event NewRound(uint256 _roundId, uint256 _endTime);
    event CloseRound(uint256 _roundId);
    event UpdateRound(uint256 _roundId, uint256 _sum, address _winner, uint256 _endTime, uint256 _cap);
    event PayWinCap(uint256 _roundId, address _winner, uint256 _cap);

    struct Round {
        uint256 endTime;
        uint256 cap;
        uint256 lastBetIndex;
        uint256 countBets;
        address winner;
        bool isPaid;
    }

    Round[] public rounds;
    uint256 public currentRound;
    uint256 public constant defaultRoundTime = 86400;   // 24 hours
    uint256 public constant freeBetsCount = 5;
    uint256 public constant ownerDistribution = 15;     // 15%
    uint256 public constant referrerDistribution = 5;   // 5%
    mapping (address => address) public playerToReferrer;

    constructor() public {

    }

    function getRoundInfo(uint256 _roundId) public view returns(uint256, uint256, uint256, address) {
        Round memory round = rounds[_roundId];
        return (round.endTime, round.cap, round.lastBetIndex, round.winner);
    }

    function payWinCap(uint256 _roundId) {
        require(rounds[_roundId].endTime < now, 'Round is not closed');
        require(rounds[_roundId].isPaid == false, 'Round is paid');

        rounds[_roundId].isPaid = true;
        rounds[_roundId].winner.transfer(rounds[_roundId].cap);

        emit PayWinCap(_roundId, rounds[_roundId].winner, rounds[_roundId].cap);
    }

    function _startNewRoundIfNeeded() private {
        if (rounds.length > currentRound) return;

        uint256 roundId = rounds.push(Round(now + defaultRoundTime, 0, 0, 0, 0x0, false)) - 1;
        emit NewRound(roundId, now);
    }

    function _closeRoundIfNeeded() private {
        if (rounds.length <= currentRound) return;
        if (now <= rounds[currentRound].endTime) return;

        currentRound = currentRound.add(1);
        emit CloseRound(currentRound - 1);
    }

    function depositRef(address _referrer) payable public {
        uint256 betIndex = getBetIndex(msg.value);
        // close if needed
        _closeRoundIfNeeded();

        // for new rounds
        _startNewRoundIfNeeded();

        require(betIndex >= getMinBetIndexForKill(rounds[currentRound].lastBetIndex), "More bet value required");
        Bet storage bet = bets[betIndex];

        // work with actual
        rounds[currentRound].countBets++;
        rounds[currentRound].lastBetIndex = betIndex;
        rounds[currentRound].endTime = now.add(bet.cooldown);
        rounds[currentRound].winner = msg.sender;

        // distribution
        uint256 ownerPercent = 0;
        uint256 referrerPercent = 0;
        if (rounds[currentRound].countBets > freeBetsCount) {
            ownerPercent = ownerDistribution;
            if (playerToReferrer[msg.sender] == 0x0 && _referrer != 0x0 && _referrer != msg.sender) playerToReferrer[msg.sender] = _referrer;
            if (playerToReferrer[msg.sender] != 0x0) referrerPercent = referrerDistribution;
        }

        ownerPercent = ownerPercent.sub(referrerPercent);
        if (ownerPercent > 0) owner.transfer(msg.value * ownerPercent / 100);
        if (referrerPercent > 0 && playerToReferrer[msg.sender] != 0x0) playerToReferrer[msg.sender].transfer(msg.value * referrerPercent / 100);

        rounds[currentRound].cap = rounds[currentRound].cap.add(msg.value * (100 - (ownerPercent + referrerPercent)) / 100);

        emit UpdateRound(currentRound, msg.value * (100 - (ownerPercent + referrerPercent)) / 100, rounds[currentRound].winner, rounds[currentRound].endTime, rounds[currentRound].cap);
    }

    function deposit() payable public {
        depositRef(0x0);
    }

}