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

public class Enemy : MonoBehaviour
{
    [SerializeField]
    private GameObject _enemyLaserPrefab;

    private Player _player;
    private Animator _animator;
    private AudioSource[] _audioClip;

    private float _speed = 3.0f;
    private float _fireRate = 3.0f;
    private float _canFire = 1;
    private bool _isDestroyed;

    void Start()
    {
        _player = GameObject.Find("Player").GetComponent<Player>();
        if (_player == null)
        {
            Debug.LogError("Enemy::Player component is NULL.");
        }

        _animator = GetComponent<Animator>();
        if (_animator == null)
        {
            Debug.LogError("Enemy::Animator component is NULL.");
        }

        _audioClip = GetComponents<AudioSource>();
        if (_audioClip == null)
        {
            Debug.LogError("Enemy::AudioClip component is NULL.");
        }
    }

    void Update()
    {
        transform.Translate(Vector3.down * _speed * Time.deltaTime);

        if (transform.position.y < -5.2f)
        {
            float randomX = Random.Range(-9f, 9f);
            transform.position = new Vector3(randomX, 7.5f, 0);
        }

        FireLaser();
    }

    private void FireLaser()
    {
        if (Time.time > _canFire && _isDestroyed == false)
        {
            _fireRate = Random.Range(3f, 7f);
            _canFire = Time.time + _fireRate;
            GameObject enemyLaser = Instantiate(_enemyLaserPrefab, transform.position + new Vector3(0, 0, 0), Quaternion.identity);
            _audioClip[1].Play();
            Laser[] lasers = enemyLaser.GetComponentsInChildren<Laser>();

            for (int i = 0; i < lasers.Length; i++)
            {
                lasers[i].AssignEnemyLaser();
            }

        }
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        string colliderTag = other.tag;

        if (colliderTag == "Player")
        {
            Player player = other.transform.GetComponent<Player>();

            if (player != null)
            {
                player.Damage();
            }

            OnHit(this.gameObject);
        }

        if (colliderTag == "Laser")
        {
            if (_player != null)
            {
                _player.AddScore(10);
            }

            Destroy(other.gameObject);
            OnHit(this.gameObject);
        }
    }

    private void OnHit(GameObject obj)
    {
        _animator.SetTrigger("OnEnemyDeath");
        _speed = 0;
        _audioClip[0].Play();
        _isDestroyed = true;
        obj.GetComponent<BoxCollider2D>().enabled = false;
        Destroy(obj, 2.7f);
    }
}