using System.Collections.Generic;
using UnityEngine;

public class MapGenerator : MonoBehaviour
{
    [Header("맵 설정용")]
    [SerializeField] private GameObject[] mapChunkPrefab;
    [SerializeField] private GameObject startChunkPrefab;
    [SerializeField] private int mapChunkSize = 14;
    private float lateSpawnedChunkLocationY = 0;
    
    [Header("플레이어 설정")]
    [SerializeField] private Transform playerTransform;
    private Queue<GameObject> chunkQueue = new Queue<GameObject>(); 

    [Header("적 설정")]
    [SerializeField] private GameObject[] groundEnemyPrefabs;
    [SerializeField] private int groundEnemyCount = 2;
    [SerializeField] private GameObject[] airEnemyPrefabs;
    [SerializeField] private int airEnemyCount = 1;

    private void Start()
    {
        playerTransform = GameObject.FindGameObjectWithTag("Player").transform;
        
        SpawnChunkPrefab();
        SpawnChunkPrefab();
        SpawnChunkPrefab();
    }

    private void SpawnChunkPrefab()
    {
        if (mapChunkPrefab == null) return;
        
        GameObject spawnedChunkObj = chunkQueue.Count < 1 ? Instantiate(startChunkPrefab) : Instantiate(mapChunkPrefab[Random.Range(0, mapChunkPrefab.Length)]);
        spawnedChunkObj.transform.position = new Vector2(0, lateSpawnedChunkLocationY);
        chunkQueue.Enqueue(spawnedChunkObj);
        
        MapChunk mapChunk = spawnedChunkObj.GetComponent<MapChunk>();
        if (mapChunk != null)
        {
            bool isMirrored = Random.value > 0.5f;
            mapChunk.InitializeChunk(isMirrored);

            mapChunk.SpawnEnemies(groundEnemyPrefabs, groundEnemyCount, airEnemyPrefabs, airEnemyCount);
        }
        else
        {
            Debug.Log("Script 추가하기");
        }
        lateSpawnedChunkLocationY -= mapChunkSize;
    }

    public void Update()
    {
        if (chunkQueue.Count < 3) return;
        float middleChunkY = lateSpawnedChunkLocationY + mapChunkSize;
        if (playerTransform.position.y <= middleChunkY)
        {
            RemoveAndSpawnNewChunk();
        }
    }

    private void RemoveAndSpawnNewChunk()
    { 
        GameObject removedChunk = chunkQueue.Dequeue();
        Destroy(removedChunk);
        
        SpawnChunkPrefab();
    }
}