using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using Random = UnityEngine.Random;

public class EnemySpawner : MonoBehaviour
{
    #region Statication

    public static EnemySpawner instance;

    private void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }
        instance = this;
    }

    #endregion
    
    [Header("Enemies")]
    public bool canSpawn = true;
    public Enemy[] enemiesToSpawn;
    public List<Transform> spawnPoints;
    public float spawnRate;
    [SerializeField] private float currentSpawnTime;
    [Header("Boss")] 
    private bool bossSpawned = false;
    public Enemy bossEnemy;
    private Enemy bossEnemyInstance;
    public Transform bossSpawnPoint;
    [SerializeField] private GameObject bossUI;
    [SerializeField] private Transform bossHealthBar;
    [SerializeField] private TextMeshProUGUI bossHealthText;
    [SerializeField] private TextMeshProUGUI bossNameText;
    [Header("Difficulty Scaling")] 
    public float levelUpIntervals;
    public int enemyLevel;
    [Header("Cache")]
    [SerializeField] private Transform enemyFolder;
    public Marisa player;

    private void Update()
    {
        if (canSpawn)
        {
            currentSpawnTime -= Time.deltaTime;
            if (currentSpawnTime < 0)
            {
                currentSpawnTime = spawnRate;
                SpawnEnemy(enemiesToSpawn[Random.Range(0, enemiesToSpawn.Length)], spawnPoints[Random.Range(0, spawnPoints.Count)].position);
            }
        }
        else if (bossSpawned && !bossEnemyInstance)
        {
            if (Input.GetKey(KeyCode.E))
            {
                LevelSwitcher.instance.LoadShop();
            }
        }
        enemyLevel = (int)(Time.time / levelUpIntervals) + 1; //figure out the time.time thing because that's not gonna work here
    }

    public Enemy SpawnEnemy(Enemy enemy, Vector3 location)
    {
        Enemy newEnemy = Instantiate(enemy, location, Quaternion.identity);
        newEnemy.transform.SetParent(enemyFolder);
        newEnemy.closestTarget = player; //idk if there's actually gonna be any other target lol
        return newEnemy;
    }

    public void StartBoss()
    {
        bossEnemyInstance = SpawnEnemy(bossEnemy, bossSpawnPoint.position);
        bossUI.SetActive(true);
        canSpawn = false;
        Enemy.OnDamaged += UpdateBossHealthBar; //this kinda sucks but it technically works??
        bossNameText.text = bossEnemyInstance.entityName;
        bossSpawned = true;
    }

    private void UpdateBossHealthBar()
    {
        bossHealthBar.localScale = new Vector3(Math.Clamp(bossEnemyInstance.health / bossEnemyInstance.maxHealth, 0, bossEnemyInstance.maxHealth), 1, 1);
        bossHealthText.text = $"{bossEnemyInstance.health}/{bossEnemyInstance.maxHealth}";
    }
}