using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Level1 : Level
{
    [Header("Enemy Setup")]
    [Tooltip("Optional: parent whose children have EnemyBase components")]
    public Transform enemiesParent;

    [Tooltip("Or manually assign enemies here")]
    public List<EnemyBase> enemies = new List<EnemyBase>();

    [Header("Monitoring")]
    [Tooltip("How often to check alive enemies")]
    public float checkInterval = 0.25f;

    private bool _running;
    private Coroutine _monitorCo;

    public override void OnLevelStart()
    {
        base.OnLevelStart();

        // Collect enemies if using a parent
        if (enemiesParent != null)
        {
            enemies.Clear();
            foreach (Transform child in enemiesParent)
            {
                var eb = child.GetComponent<EnemyBase>();
                if (eb != null) enemies.Add(eb);
            }
        }

        // Turn enemies on & let their own Start() find the player
        foreach (var e in enemies)
        {
            if (e == null) continue;
            e.gameObject.SetActive(true);
        }

        // Edge case: no enemies -> complete immediately
        if (CountAlive() == 0)
        {
            CompleteLevel();
            return;
        }

        _running = true;
        _monitorCo = StartCoroutine(MonitorEnemies());
        Debug.Log("Level1: Started, monitoring enemies...");
    }

    public override void OnLevelEnd()
    {
        base.OnLevelEnd();
        _running = false;
        if (_monitorCo != null)
        {
            StopCoroutine(_monitorCo);
            _monitorCo = null;
        }
    }

    private IEnumerator MonitorEnemies()
    {
        var wait = new WaitForSeconds(checkInterval);
        while (_running)
        {
            if (CountAlive() == 0)
            {
                CompleteLevel();
                yield break;
            }
            yield return wait;
        }
    }

    private int CountAlive()
    {
        int alive = 0;
        for (int i = 0; i < enemies.Count; i++)
        {
            var e = enemies[i];
            if (e != null && e.gameObject.activeInHierarchy && !e.IsDead())
                alive++;
        }
        return alive;
    }

    private void CompleteLevel()
    {
        Debug.Log("Level1: All enemies defeated. Completing level.");
        _running = false;

        // Tell GameplayManager if available
        if (GameplayManager.Instance != null)
        {
            GameplayManager.Instance.CompleteCurrentLevel();
        }
        else
        {
            // Fallback: just disable this level object
            gameObject.SetActive(false);
        }
    }
}