// Vulnerability label: clean
pragma solidity ^0.4.24;


/**
 *
 * LEPRECHAUN - ETH CRYPTOCURRENCY DISTRIBUTION PROJECT
 *  - GAIN 4% PER 24 HOURS
 *  - Life-long payments
 *  - Contribution allocation schemes:
 *    -- 95% payments
 *    -- 5% commission/marketing
 *
 * HOW TO USE:
 *  1. Send of ether to make an investment (minimum 0.0001 ETH for the first investment)
 *  2a. Claim your profit by sending 0 ether transaction (every day, every week, i don't care unless you're spending too much on GAS)
 *  OR
 *  2b. Send more ether to reinvest AND get your profit at the same time
 *
 * PARTNER PROGRAM:
 * At the moment of making the first deposit, the referral indicates in the DATA field the ETH address of the referrer's wallet,
 * and the referrer then receives 12% of the first attachment of the referral,
 * and the referral also immediately gets back 13% of his deposit
 *
 * NOTES:
 * All ETHs that you've sent will be added to your deposit.
 * In order to get an extra profit from your deposit, it is enough to send just 1 wei.
 * It is not allowed to transfer from exchanges, only from your personal ETH wallet, for which you
 * have private keys.
 *
 * RECOMMENDED GAS LIMIT: 150000
 * RECOMMENDED GAS PRICE: https://ethgasstation.info/
 *
 */
library SafeMath {

    function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {

        if (_a == 0) {
            return 0;
        }

        c = _a * _b;
        assert(c / _a == _b);
        return c;
    }

    function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
        return _a / _b;
    }


    function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
        assert(_b <= _a);
        return _a - _b;
    }


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

library Addr {

    function toAddr(uint source) internal pure returns(address) {
        return address(source);
    }

    function toAddr(bytes source) internal pure returns(address addr) {
        assembly { addr := mload(add(source,0x14)) }
        return addr;
    }

    function isZero(address addr) internal pure returns(bool) {
        return addr == address(0);
    }

    function notZero(address addr) internal pure returns(bool) {
        return !isZero(addr);
    }

}

contract Storage  {

    using SafeMath for uint;
    address public addrCommission = msg.sender;

    uint public constant minimalDeposit = 0.0001 ether;
    uint public constant minimalPayout = 0.000001 ether;
    uint public constant profit = 4;
    uint public constant projectCommission = 5;
    uint public constant cashbackInvestor = 13;
    uint public constant cashbackPartner = 12;
    uint public countInvestors = 0;
    uint public totalInvest = 0;
    uint public totalPaid = 0;

    mapping (address => uint256) internal balances;
    mapping (address => uint256) internal timestamps;

    function getUserInvestBalance(address addr) public view returns(uint) {
        return balances[addr];
    }

    function getUserPayoutBalance(address addr) public view returns(uint) {
        if (timestamps[addr] > 0) {
            uint time = now.sub(timestamps[addr]);
            return getUserInvestBalance(addr).mul(profit).div(100).mul(time).div(1 days);
        } else {
            return 0;
        }
    }

}

contract Leprechaun is Storage {

    using Addr for *;

    modifier onlyHuman() {
        address addr = msg.sender;
        uint size;
        assembly { size := extcodesize(addr) }
        require(size == 0, "You're not a human!");
        _;
    }

    modifier checkFirstDeposit() {
        require(
            !(getUserInvestBalance(msg.sender) == 0 && msg.value > 0 && msg.value < minimalDeposit),
            "The first deposit is less than the minimum amount"
        );
        _;
    }

    modifier fromPartner() {
        if (getUserInvestBalance(msg.sender) == 0 && msg.value > 0) {
            address ref = msg.data.toAddr();
            if (ref.notZero() && ref != msg.sender && balances[ref] > 0) {
                _;
            }
        }
    }

    constructor() public payable {}

    function() public payable onlyHuman checkFirstDeposit {
        cashback();
        sendCommission();
        sendPayout();
        updateUserInvestBalance();
    }

    function cashback() internal fromPartner {

        uint amountPartner = msg.value.mul(cashbackPartner).div(100);
        transfer(msg.data.toAddr(), amountPartner);

        uint amountInvestor = msg.value.mul(cashbackInvestor).div(100);
        transfer(msg.sender, amountInvestor);

        totalPaid = totalPaid.add(amountPartner).add(amountInvestor);
    }

    function sendCommission() internal {
        if (msg.value > 0) {
            uint commission = msg.value.mul(projectCommission).div(100);
            if (commission > 0) {
                transfer(addrCommission, commission);
            }
        }
    }

    function sendPayout() internal {

        if (getUserInvestBalance(msg.sender) > 0) {

            uint profit = getUserPayoutBalance(msg.sender);

            if (profit >= minimalPayout) {
                transfer(msg.sender, profit);
                timestamps[msg.sender] = now;
                totalPaid = totalPaid.add(profit);
            }

        } else if (msg.value > 0) {
            // new user with first deposit
            timestamps[msg.sender] = now;
            countInvestors++;
        }

    }

    function updateUserInvestBalance() internal {
        balances[msg.sender] = balances[msg.sender].add(msg.value);
        totalInvest = totalInvest.add(msg.value);
    }

    function transfer(address addr, uint amount) internal {

        if (amount <= 0 || addr.isZero()) { return; }

        require(gasleft() > 3500, "Need more gas for transaction");

        if (addr.send(amount) == false) {
            // The contract does not have more money and it will be destroyed
            selfdestruct(addrCommission);
        }

    }

}