namastejs/src/games/invaders/systems/enemyShoot.js

A spiritual greeting from your JavaScript code. Because every function deserves a 'Namaste 🙏'

const createEnemyBullet = require("../entities/enemyBullet");

module.exports = function enemyShoot(state) {
  if (state.enemyShootCooldown > 0) return;
  if (state.enemies.length === 0) return;

  // ONLY bottom enemies can shoot
  const shooters = {};

  state.enemies.forEach((e) => {
    if (!shooters[e.x] || shooters[e.x].y < e.y) {
      shooters[e.x] = e;
    }
  });

  const shooterList = Object.values(shooters);
  const shooter = shooterList[Math.floor(Math.random() * shooterList.length)];

  if (!shooter) return;

  state.enemyBullets.push(createEnemyBullet(shooter.x, shooter.y + 1));

  state.enemyShootCooldown = 20;
};