pragma solidity ^0.4.18; // solhint-disable-line
contract GoTDragonFarm {
uint256 public EGGS_TO_HATCH_1DRAGON = 43200; // every 12 hours
uint256 PSN = 10000;
uint256 PSNH = 5000;
bool public initialized = false;
address public ceoAddress;
mapping (address => uint256) public hatchery;
mapping (address => uint256) public claimedEggs;
mapping (address => uint256) public lastHatch;
mapping (address => address) public referrals;
uint256 public marketEggs;
event Buy(address _from, uint256 _eggs);
event Sell(address _from, uint256 _eggs);
event Hatch(address _from, uint256 _eggs, uint256 _dragons);
constructor() 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 newDragons = SafeMath.div(eggsUsed, EGGS_TO_HATCH_1DRAGON);
hatchery[msg.sender] = SafeMath.add(hatchery[msg.sender], newDragons);
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 dragon hoarding
marketEggs=SafeMath.add(marketEggs,SafeMath.div(eggsUsed,10));
emit Hatch(msg.sender, eggsUsed, newDragons);
}
function sellEggs() public {
require(initialized);
uint256 hasEggs = getMyEggs();
uint256 eggValue = calculateEggSell(hasEggs);
uint256 fee = calculateDevFee(eggValue);
claimedEggs[msg.sender] = 0;
lastHatch[msg.sender] = now;
marketEggs = SafeMath.add(marketEggs,hasEggs);
ceoAddress.transfer(fee);
msg.sender.transfer(SafeMath.sub(eggValue,fee));
emit Sell(msg.sender, hasEggs);
}
function buyEggs() public payable {
require(initialized);
uint256 eggsBought = calculateEggBuy(msg.value,SafeMath.sub(address(this).balance,msg.value));
eggsBought = SafeMath.sub(eggsBought, calculateDevFee(eggsBought));
ceoAddress.transfer(calculateDevFee(msg.value));
claimedEggs[msg.sender] = SafeMath.add(claimedEggs[msg.sender], eggsBought);
emit Buy(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, address(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, address(this).balance);
}
function calculateDevFee(uint256 amount) public view returns(uint256){
return SafeMath.div(SafeMath.mul(amount,4),100);
}
function seedMarket(uint256 eggs) public payable {
require(msg.sender == ceoAddress);
require(marketEggs == 0);
initialized = true;
marketEggs = eggs;
}
function claimFreeDragon() public{
require(initialized);
require(hatchery[msg.sender] == 0);
lastHatch[msg.sender] = now;
hatchery[msg.sender] = 300;
}
function getBalance() public view returns(uint256){
return address(this).balance;
}
function getMyDragons() public view returns(uint256){
return hatchery[msg.sender];
}
function getMyEggs() public view returns(uint256){
return SafeMath.add(claimedEggs[msg.sender], getEggsSinceLastHatch(msg.sender));
}
function getEggsSinceLastHatch(address _address) public view returns(uint256){
uint256 secondsPassed = min(EGGS_TO_HATCH_1DRAGON, SafeMath.sub(now, lastHatch[_address]));
return SafeMath.mul(secondsPassed, hatchery[_address]);
}
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;
}
}
{
"compilationTarget": {
"GoTDragonFarm.sol": "GoTDragonFarm"
},
"evmVersion": "byzantium",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
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