pragma solidity ^0.4.18; // solhint-disable-line

contract ShrimpFarmer{ //uint256 EGGS_PER_SHRIMP_PER_SECOND=1; uint256 public EGGS_TO_HATCH_1SHRIMP=86400;//for final version should be seconds in a day uint256 public STARTING_SHRIMP=300; uint256 PSN=10000; uint256 PSNH=5000; bool public initialized=false; address public ceoAddress; mapping (address => uint256) public hatcheryShrimp; mapping (address => uint256) public claimedEggs; mapping (address => uint256) public lastHatch; mapping (address => address) public referrals; uint256 public marketEggs; function ShrimpFarmer() public{ ceoAddress=msg.sender; } function hatchEggs(address ref) public{ require(initialized); if(referrals[msg.sender]==0 && referrals[msg.sender]!=msg.sender){ referrals[msg.sender]=ref; } uint256 eggsUsed=getMyEggs(); uint256 newShrimp=SafeMath.div(eggsUsed,EGGS_TO_HATCH_1SHRIMP); hatcheryShrimp[msg.sender]=SafeMath.add(hatcheryShrimp[msg.sender],newShrimp); claimedEggs[msg.sender]=0; lastHatch[msg.sender]=now;

    //send referral eggs
    claimedEggs[referrals[msg.sender]]=SafeMath.add(claimedEggs[referrals[msg.sender]],SafeMath.div(eggsUsed,5));
    
    //boost market to nerf shrimp hoarding
    marketEggs=SafeMath.add(marketEggs,SafeMath.div(eggsUsed,10));
}
function sellEggs() public{
    require(initialized);
    uint256 hasEggs=getMyEggs();
    uint256 eggValue=calculateEggSell(hasEggs);
    uint256 fee=devFee(eggValue);
    claimedEggs[msg.sender]=0;
    lastHatch[msg.sender]=now;
    marketEggs=SafeMath.add(marketEggs,hasEggs);
    ceoAddress.transfer(fee);
    msg.sender.transfer(SafeMath.sub(eggValue,fee));
}
function buyEggs() public payable{
    require(initialized);
    uint256 eggsBought=calculateEggBuy(msg.value,SafeMath.sub(this.balance,msg.value));
    eggsBought=SafeMath.sub(eggsBought,devFee(eggsBought));
    ceoAddress.transfer(devFee(msg.value));
    claimedEggs[msg.sender]=SafeMath.add(claimedEggs[msg.sender],eggsBought);
}
//magic trade balancing algorithm
function calculateTrade(uint256 rt,uint256 rs, uint256 bs) public view returns(uint256){
    //(PSN*bs)/(PSNH+((PSN*rs+PSNH*rt)/rt));
    return SafeMath.div(SafeMath.mul(PSN,bs),SafeMath.add(PSNH,SafeMath.div(SafeMath.add(SafeMath.mul(PSN,rs),SafeMath.mul(PSNH,rt)),rt)));
}
function calculateEggSell(uint256 eggs) public view returns(uint256){
    return calculateTrade(eggs,marketEggs,this.balance);
}
function calculateEggBuy(uint256 eth,uint256 contractBalance) public view returns(uint256){
    return calculateTrade(eth,contractBalance,marketEggs);
}
function calculateEggBuySimple(uint256 eth) public view returns(uint256){
    return calculateEggBuy(eth,this.balance);
}
function devFee(uint256 amount) public view returns(uint256){
    return SafeMath.div(SafeMath.mul(amount,4),100);
}
function seedMarket(uint256 eggs) public payable{
    require(marketEggs==0);
    initialized=true;
    marketEggs=eggs;
}
function getFreeShrimp() public{
    require(initialized);
    require(hatcheryShrimp[msg.sender]==0);
    lastHatch[msg.sender]=now;
    hatcheryShrimp[msg.sender]=STARTING_SHRIMP;
}
function getBalance() public view returns(uint256){
    return this.balance;
}
function getMyShrimp() public view returns(uint256){
    return hatcheryShrimp[msg.sender];
}
function getMyEggs() public view returns(uint256){
    return SafeMath.add(claimedEggs[msg.sender],getEggsSinceLastHatch(msg.sender));
}
function getEggsSinceLastHatch(address adr) public view returns(uint256){
    uint256 secondsPassed=min(EGGS_TO_HATCH_1SHRIMP,SafeMath.sub(now,lastHatch[adr]));
    return SafeMath.mul(secondsPassed,hatcheryShrimp[adr]);
}
function min(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; } }