zombieattack.sol

pragma solidity ^0.4.19;

import "./zombiehelper.sol";

contract ZombieAttack is ZombieHelper {
    uint randNonce = 0;
    uint attackVictoryProbability = 70;

    function randMod(uint _modulus) internal returns(uint) {
        randNonce++;
        return uint(keccak256(now, msg.sender, randNonce)) % _modulus;
    }

    function attack(uint _zombieId, uint _targetId) external onlyOwnerOf(_zombieId) {
        Zombie storage myZombie = zombies[_zombieId];
        Zombie storage enemyZombie = zombies[_targetId];
        uint rand = randMod(100);
        if (rand <= attackVictoryProbability) {
            myZombie.winCount++;
            myZombie.level++;
            enemyZombie.lossCount++;
            feedAndMultiply(_zombieId, enemyZombie.dna, "zombie");
        } else {
            myZombie.lossCount++;
            enemyZombie.winCount++;
            _triggerCooldown(myZombie);
        }
    }
}