#nullable enable
using System;
using System.Collections;
using NaughtyAttributes;
using UnityEngine;
using Random = UnityEngine.Random;

public class Arena : MonoBehaviour {
	[Serializable] 
	struct GladiatorEntrance {
		public Vector2 position;
		public Vector2 direction;
	}
	
	[SerializeField] [Required]
	GameFlowManager gameFlowManager = null!;

	//TODO probably add initial direction too
	//TODO Add some kind of "MinLength(1)" attribute
	[SerializeField]
	GladiatorEntrance[] spawners = null!;
	[SerializeField] [Required]
	ArenaStats stats = null!;
	[SerializeField] [Required]
	GameObject entityPrefab = null!;

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

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

	void SpawnEnemy(int spawnerIndex) {
		if (gameFlowManager.Paused)
			return;
		
		var entity = Instantiate(entityPrefab, spawners[spawnerIndex].position, Quaternion.identity).GetComponent<Entity>();
		entity.direction = spawners[spawnerIndex].direction;
		entity.gameFlowManager = gameFlowManager;
	}

	IEnumerator SpawnEnemies() {
		yield return new WaitForSeconds(stats.initWaitToSpawn);
		
		int currentSpawner = 0;
		int amountSpawned = 0;
		while(true){
			while (amountSpawned < stats.waveSize) {
				currentSpawner = Random.Range(0, spawners.Length);
				SpawnEnemy(currentSpawner);
				amountSpawned++;
			}
			yield return new WaitForSeconds(stats.secondsBetweenSpawners);
			amountSpawned = 0;
		}
		
	}

#if UNITY_EDITOR
	void OnDrawGizmosSelected() {
		Gizmos.color = Color.blue;
		foreach (GladiatorEntrance entrance in spawners) {
			Gizmos.DrawWireCube(entrance.position, Vector3.one);
			Gizmos.DrawLine(entrance.position, entrance.position + entrance.direction);
		}
	}
#endif
}