using System.Collections.Generic;
using UnityEngine;

public class WaveObserver : Singleton<WaveObserver>
{
    private List<SpawnerTile> _subjects = new List<SpawnerTile>();
    private List<int> _aliveEnemyCount = new List<int>();
    private List<int> _copyConstantSpawn;
    private WaveConfig _levelConfig;
    private const int MAXENEMYCOUNT = 3;
    public WaveConfig LevelConfig 
    { 
        set 
        { 
            _levelConfig = value;
            _copyConstantSpawn = new List<int>();
            foreach (EnemyType enemy in _levelConfig.ConstantSpawn)
            {
                _copyConstantSpawn.Add(enemy.Count);
            }
        } 
    }
    
    public void Attach(SpawnerTile spawnerSubject)
    {
        spawnerSubject.Prefab = _levelConfig.GetRandomSpawn().GetEnemyObject();
        spawnerSubject.InitialSpawnSpeed(_levelConfig.GetInterval());
        _subjects.Add(spawnerSubject);
        _aliveEnemyCount.Add(0);
    }

    public void NotifySpawned(SpawnerTile spawnerSubject)
    {
        GameObject paramPrefab = spawnerSubject.Prefab;
        if (paramPrefab.Equals(_levelConfig.ConstantSpawn[0].GetEnemyObject()))
        {
            int currentCount = 0;
            for (int i = 0; i < _copyConstantSpawn.Count; i++)
            {
                if(_levelConfig.ConstantSpawn[i].GetEnemyObject() == paramPrefab)
                {
                    currentCount = _copyConstantSpawn[i]--;
                    break;
                }
            }
            if (currentCount <= 0)
            {
                foreach (SpawnerTile spawner in _subjects)
                {
                    if (spawner.Prefab.Equals(paramPrefab))
                    {
                        spawner.StopSpawn();
                    }
                }
            }
        }
    }

    public int NotifyEnemy(float yPosition)
    {
        for (int i = 0; i < _subjects.Count; i++)
        {
            if(_subjects[i].Position.y == yPosition)
            {
                _aliveEnemyCount[i]++;
                if(_aliveEnemyCount[i] >= MAXENEMYCOUNT)
                {
                    _subjects[i].StopSpawn();
                }
                return i;
            }
        }
        return -1;
    }

    public void NotifyDies(int position)
    {
        if(_aliveEnemyCount[position] >= MAXENEMYCOUNT)
        {
            _subjects[position].StartSpawn();
        }
        _aliveEnemyCount[position]--;
    }
}