using Assets.Scripts;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using static GameHandler;

public class LevelSpawner : SingletonMB<LevelSpawner>
{

    #region PROPERTIES
    #endregion
    #region VARIABLES
    private GameHandler _gameHandler;


    [SerializeField] private GameObject[] patternsPrefabs;
    [SerializeField] private Transform levelSpawner;
    [SerializeField] private float patternInterval;
    [SerializeField] private GameObject PlayersContainer;
    [SerializeField] private GameObject missilePrefab;
    [SerializeField] private GameObject missileAlertPrefab;
    [SerializeField] private float dangerMinX = -25f;

    private List<MissileAlertInfo> missileAlertList = new List<MissileAlertInfo>();
    private List<Transform> spawnedGameElements = new List<Transform>();
    private GameObject prefabParent;
    private float patternLength;
    private ObstaclePatternBehaviour lastSpawnedPattern;
    private float rewardValue = 0f;

#endregion
#region EVENTS
    
    public event EventHandler<PrefabSpawnedEventArgs> OnPrefabSpawned;
    

    public class PrefabSpawnedEventArgs : EventArgs
    {
        public ObstaclePatternBehaviour pattern;
        public PrefabSpawnedEventArgs(ObstaclePatternBehaviour pattern)
        {
            this.pattern = pattern;
        }
    }
    
    public void ResetLevel_OnAttemptEnding(object sender, AttemptEventArgs e) 
    {
        foreach (Transform gameElement in spawnedGameElements)
        {
            if (gameElement != null)
            {
                Destroy(gameElement.gameObject);
            }
        }
        if(lastSpawnedPattern)Destroy(lastSpawnedPattern.gameObject);
        lastSpawnedPattern = null;
    }

#endregion
#region METHODS

    void PrefabSpawnerBehaviour()
    {
        if (lastSpawnedPattern == null)
        {
            SpawnObstacle();
        }
    }

    void SpawnObstacle()
    {
        GameObject obstacleToSpawn = patternsPrefabs[UnityEngine.Random.Range(0, patternsPrefabs.Length)];
        patternLength = obstacleToSpawn.transform.lossyScale.x;
        lastSpawnedPattern = Instantiate(obstacleToSpawn, transform.position, Quaternion.identity, prefabParent.transform)
            .GetComponent<ObstaclePatternBehaviour>();

        OnPrefabSpawned?.Invoke(this, new PrefabSpawnedEventArgs(lastSpawnedPattern));
    }

    //IEnumerator SpawnMissileAfterDelay(GameObject missileAlert, GameObject player)
    //{
    //    yield return new WaitForSeconds(3f);
    //    Vector3 missileSpawnPosition = missileAlert.transform.position + new Vector3(2.5f, 0, 0);
    //    Destroy(missileAlert);
    //    GameObject newMissile = Instantiate(missilePrefab, missileSpawnPosition, Quaternion.identity, prefabParent.transform);
    //    MissileScript missileScript = newMissile.GetComponent<MissileScript>();
    //    missileScript.Target = player;
    //    spawnedGameElements.Add(newMissile.transform);
    //}

    private void RemoveExpiredGameElements()
    {
        List<Transform> gameElementToRemove = new List<Transform>();

        foreach (Transform gameElementTransform in spawnedGameElements)
        {
            if (gameElementTransform == null)
            {
                gameElementToRemove.Add(gameElementTransform);
                continue;
            }
            if (gameElementTransform.position.x < dangerMinX)
            {
                gameElementToRemove.Add(gameElementTransform);
            }
        }

        foreach (Transform gameElement in gameElementToRemove)
        {
            if (gameElement != null)
            {
                Destroy(gameElement.gameObject);
            }
        }
    }

    //private void UpdateMissileAlertPositions()
    //{
    //    missileAlertList.RemoveAll(item => item.alertTransform == null);
    //    foreach (MissileAlertInfo Element in missileAlertList)
    //    {
    //        Vector3 newPosition = new Vector3(Element.alertTransform.position.x, Element.player.transform.position.y + 0.544f, 0);
    //        Element.alertTransform.position = newPosition;
    //    }
    //}

#endregion
#region LIFECYCLE

    void Start()
    {
        prefabParent = GameObject.Find("prefab");
    }

    protected override void Awake()
    {
        _gameHandler = GameHandler.Instance;

        _gameHandler.OnAttemptEnding += ResetLevel_OnAttemptEnding;
    }

    void Update()
    {
        if (!GameController.Instance.IsExiting)
        {
            PrefabSpawnerBehaviour();
            RemoveExpiredGameElements();

        }
        //UpdateMissileAlertPositions();
    }

#endregion
   
    public struct MissileAlertInfo
    {
        public Transform alertTransform;
        public GameObject player;
    }

}