import Enemy from '../objects/Enemy.js';

export default class SpawnManager {
  constructor(scene, unitData) {
    this.scene = scene;
    this.unitDefs = unitData;   // object keyed by enemy type
    this.timer = null;
  }

  startSpawning(interval) {
    this.timer = this.scene.time.addEvent({
      delay: interval,
      loop: true,
      callback: this.spawnEnemy,
      callbackScope: this
    });
  }

  updateSpawnInterval(newInterval) {
    if (this.timer) { this.timer.remove(); }
    this.startSpawning(newInterval);
  }

  spawnEnemy() {
    const levelCfg = this.scene.levelManager.currentConfig;
    const type = Phaser.Utils.Array.GetRandom(levelCfg.enemyTypes);
    const def = this.unitDefs[type];
    const x = Phaser.Math.Between(50, this.scene.scale.width - 50);
    const y = -def.height; // just above screen
    const enemy = new Enemy(this.scene, x, y, 'enemy', def);
    this.scene.enemies.add(enemy);
  }
}