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

public class ZombieSpawner : MonoBehaviour
{
    [SerializeField]
    List<Transform> SpawnPoints;
    [SerializeField]
    public List<AudioClip> ZombieDeathByDisableSoundeffects;
    [SerializeField]
    GameObject ZombiePrefab;
    [SerializeField]
    private float _spawnRate = 2.0f;
    [SerializeField]
    private float _dontSpawnForLastSeconds = 3.0f;
    [SerializeField, ShowOnly]
    private float _spawnTimer;
    [SerializeField, ShowOnly]
    private float _enabledTimer = 0.0f;

    private float _secondsPerAliveTime;
    private bool _startedFading = false;

    // Start wird aufgerufen, bevor das erste Frame gezeichnet wird
    void Start()
    {
        // letzte _dontSpawnForLastSeconds sekunden keine Zombies mehr spawnen
        _secondsPerAliveTime = GetComponentInParent<Zeitschaltuhr>().ActiveTimeSpanInSeconds - _dontSpawnForLastSeconds;
        _spawnTimer = Random.Range(0.5f * _secondsPerAliveTime / _spawnRate, _secondsPerAliveTime / _spawnRate);
        _enabledTimer = _secondsPerAliveTime + _dontSpawnForLastSeconds;
    }

    // Update wird einmal pro Frame aufgerufen
    void Update()
    {
        _enabledTimer -= Time.deltaTime;
        _spawnTimer -= Time.deltaTime;

        // als übergang von Schrei zu Tröte
        if (_enabledTimer < _dontSpawnForLastSeconds && !_startedFading)
        {
            _startedFading = true;
            FadeOutNoises();
        }

        if (_spawnTimer <= 0)
        {
            SpawnZombie();
            _spawnTimer = (_secondsPerAliveTime - _dontSpawnForLastSeconds) / _spawnRate;
        }
    }

    private void OnEnable()
    {
        if (_secondsPerAliveTime > 0)
        {
            _enabledTimer = _secondsPerAliveTime;
            _startedFading = false;
        }
        if (GameManager.Instance != null)
        {
            if (GameManager.Instance.ContextBuffer != null)
                GameManager.Instance.AddContext("The Developer informs Gottfried that Zombies appeared outside so Gottfried better not leave the office");
        }
    }

    private void OnDisable()
    {
        if (GameManager.Instance.ContextBuffer != null)
            GameManager.Instance.RemoveContext("The Developer informs Gottfried that Zombies appeared outside so Gottfried better not leave the office");
        // Destroy all children (zombies)
        KillZombiesByDisable();

    }

    private void FadeOutNoises()
    {
        for (int i = 0; i < transform.childCount; i++)
        {
            GameObject zombie = transform.GetChild(i).gameObject;
            zombie.GetComponent<Zombie>().FadeOutNoise();
        }
    }

    private void SpawnZombie()
    {
        if (transform.childCount > _spawnRate) return;
        Transform pos = SpawnPoints[Random.Range(0, SpawnPoints.Count)];
        Quaternion rotation = Quaternion.Euler(0, Random.Range(0, 359), 0);
        Instantiate(ZombiePrefab, pos.position, rotation, transform);
    }

    private void KillZombiesByDisable()
    {
        for (int i = 0; i < transform.childCount; i++)
        {
            GameObject zombie = transform.GetChild(i).gameObject;
            Vector3 zombiePosition = zombie.transform.position;
            Destroy(zombie);
            GameObject particleEffect = Instantiate(GameManager.Instance.ZombieDeathByDisableParticleEffect, zombiePosition, Quaternion.Euler(-90, 0, 0), GameManager.Instance.transform);
            AudioSource audio = particleEffect.GetComponent<AudioSource>();
            audio.clip = ZombieDeathByDisableSoundeffects[Random.Range(0, ZombieDeathByDisableSoundeffects.Count)];
            audio.Play();
        }
    }
}