using System.Collections.Generic;
using UnityEngine;

public class WaveObserver : Singleton<WaveObserver>
{
    private List<SpawnerTile> _subjects = new List<SpawnerTile>();
    private List<float> _aliveEnemyCount = new List<float>();
    private List<int> _copyConstantSpawn;
    private WaveConfig _levelConfig;
    private const int MAXTOUGHNESS = 10;
    private int _spawnerTiming = 0;
    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.ChangeSpawnSpeed(_levelConfig.GetInterval() * ++_spawnerTiming);
        _subjects.Add(spawnerSubject);
        _aliveEnemyCount.Add(0);
        Debug.Log("Je suis le " + _spawnerTiming + "e a agir!!!");
    }

    public void NotifySpawned(SpawnerTile spawnerSubject)
    {
        GameObject paramPrefab = spawnerSubject.Prefab;
        spawnerSubject.ChangeSpawnSpeed(_levelConfig.GetInterval() * _spawnerTiming);
        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, float toughness)
    {
        int index = FindEnemyIndex(yPosition);
        _aliveEnemyCount[index] += toughness;
        if (_aliveEnemyCount[index] >= MAXTOUGHNESS)
        {
            _subjects[index].StopSpawn();
        }
        return index;
    }

    public void NotifyDies(int position, float toughness)
    {
        _aliveEnemyCount[position] -= toughness;
        if (_aliveEnemyCount[position] < MAXTOUGHNESS)
        {
            _subjects[position].StartSpawn();
        }
        Debug.Log("Fallen monster ");
    }

    /**
     * Called when an enemy is spawned automatically at the start of the game
     * Adjusts the intervall between spawns
     */
    public void NotifyOnStart()
    {
        float interval = _levelConfig.GetUpdatedInterval();
        foreach (var subject in _subjects)
        {
            subject.ChangeSpawnSpeed(interval);
        }
    }

    private int FindEnemyIndex(float yPosition)
    {
        for (int i = 0; i < _subjects.Count; i++)
        {
            if (_subjects[i].Position.y == yPosition)
            {
                return i;
            }
        }
        return -1;
    }
}