pragma solidity ^0.4.18;

/*
                  _____                                             
|         | |  .-~     ~.  |         |                              
|_________| | :            |_________|                              
|         | | :     _____  |         |                              
|         | |  `-._____.'| |         |                              
                                                                    
               ______                       ____                    
|`````````,  .~      ~.  |        |        |            |`````````, 
|'''|'''''  |          | |        |        |______      |'''|'''''  
|    `.     |          | |        |        |            |    `.     
|      `.    `.______.'  |_______ |_______ |___________ |      `.   
                                                                    
                               _____                                
|    ..'' | |..          |  .-~     ~.              ..''''          
|..''     | |  ``..      | :                     .''                
|``..     | |      ``..  | :     _____        ..'                   
|    ``.. | |          ``|  `-._____.'| ....''                      
                                                                    
                                                                    
|``````.  | `.           .'             ..''''                      
|       | |   `.       .'            .''                            
|       | |     `.   .'           ..'                               
|......'  |       `.'       ....''                                  
                                                                    
*/

contract HRKD{
    
    mapping (address => uint256) public investedETH;
    mapping (address => uint256) public lastInvest;
    
    mapping (address => uint256) public affiliateCommision;
    
    address dev = 0xaf9c025ce6322a23ac00301c714f4f42895c9818;
    address promoter = 0x6842a9ad0BC604c1D9330190B9035051a7525569;
    
    function investETH(address referral) public payable {
        
        require(msg.value >= 0.5 ether);
        
        if(getProfit(msg.sender) > 0){
            uint256 profit = getProfit(msg.sender);
            lastInvest[msg.sender] = now;
            msg.sender.transfer(profit);
        }
        
        uint256 amount = msg.value;
        uint256 commision = SafeMath.div(amount, 20);
        if(referral != msg.sender && referral != 0x1 && referral != dev && referral != promoter){
            affiliateCommision[referral] = SafeMath.add(affiliateCommision[referral], commision);
        }
        
        affiliateCommision[dev] = SafeMath.add(affiliateCommision[dev], commision);
        affiliateCommision[promoter] = SafeMath.add(affiliateCommision[promoter], commision);
        
        investedETH[msg.sender] = SafeMath.add(investedETH[msg.sender], amount);
        lastInvest[msg.sender] = now;
    }
    
    
    function withdraw() public{
        uint256 profit = getProfit(msg.sender);
        require(profit > 0);
        lastInvest[msg.sender] = now;
        msg.sender.transfer(profit);
    }
    
    function getProfitFromSender() public view returns(uint256){
        return getProfit(msg.sender);
    }

    function getProfit(address customer) public view returns(uint256){
        uint256 secondsPassed = SafeMath.sub(now, lastInvest[customer]);
        return SafeMath.div(SafeMath.mul(secondsPassed, investedETH[customer]), 345600);
    }
    
    function reinvestProfit() public {
        uint256 profit = getProfit(msg.sender);
        require(profit > 0);
        lastInvest[msg.sender] = now;
        investedETH[msg.sender] = SafeMath.add(investedETH[msg.sender], profit);
    }
    
    function getAffiliateCommision() public view returns(uint256){
        return affiliateCommision[msg.sender];
    }
    
    function withdrawAffiliateCommision() public {
        require(affiliateCommision[msg.sender] > 0);
        uint256 commision = affiliateCommision[msg.sender];
        affiliateCommision[msg.sender] = 0;
        msg.sender.transfer(commision);
    }
    
    function getInvested() public view returns(uint256){
        return investedETH[msg.sender];
    }
    
    function getBalance() public view returns(uint256){
        return this.balance;
    }

    function min(uint256 a, uint256 b) private pure returns (uint256) {
        return a < b ? a : b;
    }
    
    function max(uint256 a, uint256 b) private pure returns (uint256) {
        return a > b ? a : b;
    }
}

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws 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;
  }

  /**
  * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}