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ZombieAttack.sol
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ZombieAttack.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./zombiehelper.sol";
import "./OpenZeppelin/SafeMath.sol";
/// @title ZombieAttack
/// @author cristianrisueo
/// @notice This contract contains the data and logic related to the battle system
contract ZombieAttack is ZombieHelper {
// Use of the library SafeMath
using SafeMath for uint256;
using SafeMath32 for uint32;
using SafeMath16 for uint16;
// Variable used to make the pseudorandomness
uint randNonce = 0;
uint attackVictoryProbability = 70;
/// @notice This function is used to calculate the pseudorandom number
/// @param _modulus the divisor to get the number
/// @return uint The pseudorandom number
function randMod(uint _modulus) internal returns(uint) {
randNonce = randNonce.add(1);
return uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, randNonce))) % _modulus;
}
/// @notice This function is the attack system of the game
/// @param _zombieId The ID of our zombie
/// @param _targetId The ID of the food of our zombie
function attack(uint _zombieId, uint _targetId) external onlyOwnerOf(_zombieId) {
// Gets the zombies from the array and generates the pseudorandom number
Zombie storage myZombie = zombies[_zombieId];
Zombie storage enemyZombie = zombies[_targetId];
uint rand = randMod(100);
// If our zombie wins updates some stats and calls feedAndMultiply
if (rand <= attackVictoryProbability) {
myZombie.winCount = myZombie.winCount.add(1);
myZombie.level = myZombie.level.add(1);
enemyZombie.lossCount = enemyZombie.lossCount.add(1);
feedAndMultiply(_zombieId, enemyZombie.dna, "zombie");
} else {
// If our zombie losses updates some stats and calls _triggerCoolDown
myZombie.lossCount = myZombie.lossCount.add(1);
enemyZombie.winCount = myZombie.winCount.add(1);
_triggerCooldown(myZombie);
}
}
}