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Lesson5Chapter9.sol
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Lesson5Chapter9.sol
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pragma solidity >=0.5.0 <0.6.0;
import "./ownable.sol";
// 1. Import here
import "./safemath.sol";
contract ZombieFactory is Ownable {
// 2. Declare using safemath here
using SafeMath for uint256;
event NewZombie(uint zombieId, string name, uint dna);
uint dnaDigits = 16;
uint dnaModulus = 10 ** dnaDigits;
uint cooldownTime = 1 days;
struct Zombie {
string name;
uint dna;
uint32 level;
uint32 readyTime;
uint16 winCount;
uint16 lossCount;
}
Zombie[] public zombies;
mapping (uint => address) public zombieToOwner;
mapping (address => uint) ownerZombieCount;
function _createZombie(string memory _name, uint _dna) internal {
uint id = zombies.push(Zombie(_name, _dna, 1, uint32(now + cooldownTime), 0, 0)) - 1;
zombieToOwner[id] = msg.sender;
ownerZombieCount[msg.sender]++;
emit NewZombie(id, _name, _dna);
}
function _generateRandomDna(string memory _str) private view returns (uint) {
uint rand = uint(keccak256(abi.encodePacked(_str)));
return rand % dnaModulus;
}
function createRandomZombie(string memory _name) public {
require(ownerZombieCount[msg.sender] == 0);
uint randDna = _generateRandomDna(_name);
randDna = randDna - randDna % 100;
_createZombie(_name, randDna);
}
}