#nullable enable
using System.Collections;
using UnityEngine;

public class Arena : MonoBehaviour {
	//TODO probably add initial direction too
	[SerializeField] Vector3[] spawners = null!;
	[SerializeField] ArenaStats stats = null!;
	[SerializeField] GameObject monsterPrefab = null!;

	SafeZone safeZone = null!;
	
	void Awake() => safeZone = GetComponentInChildren<SafeZone>();

	void Start() => StartCoroutine(SpawnEnemies());

	void SpawnEnemy(int spawnerIndex) {
		var monster = Instantiate(monsterPrefab, spawners[spawnerIndex], Quaternion.identity).GetComponent<Monster>();
		//TODO Replace hardcoded target with entity discovery
		monster.SetTarget(safeZone.transform);
	}

	IEnumerator SpawnEnemies() {
		yield return new WaitForSeconds(stats.secondsBetweenSpawners);
		
		int currentSpawner = 0;
		
		//TODO Stop when pause/end game
		while (true) {
			SpawnEnemy(currentSpawner);
			currentSpawner = Random.Range(0, spawners.Length);
			yield return new WaitForSeconds(stats.secondsBetweenSpawners);
		}
	}

#if UNITY_EDITOR
	void OnDrawGizmosSelected() {
		Gizmos.color = Color.blue;
		foreach (Vector3 spawner in spawners)
			Gizmos.DrawWireCube(spawner, Vector3.one);
	}
#endif
}