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

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

using UnityEngine;
using Utility;

public class Zombie : MonoBehaviour
{
    [SerializeField]
    List<AudioClip> Noises;
    [SerializeField]
    private float _speed = 0.5f;
    [SerializeField]
    private float _rotateSpeed = 180.0f;
    [SerializeField]
    private float _attackRange = 1.3f;
    [SerializeField]
    private float _idleThresholdFactor = 0.2f;
    [SerializeField]
    private float _noiseDelay = 5.0f;
    [SerializeField, ShowOnly]
    private float _noiseTimer;

    private Rigidbody _rb;
    private AudioSource _audioSource;
    private bool _fadeOutNoise = false;
    private Animator _animator;
    private bool _isAttacking = false;
    private float _idleThreshold;
    private Quaternion _initialRotation;



[ContextMenu("Kill Zombie")]
    private void TestDIe()
    {
        Die();
    }

    void Start()
    {
        _rb = GetComponent<Rigidbody>();
        _noiseTimer = Random.Range(0.3f * _noiseDelay, 1.5f * _noiseDelay);
        _audioSource = GetComponent<AudioSource>();
        _animator = GetComponent<Animator>();
        _idleThreshold = _speed / _idleThresholdFactor;
        _initialRotation = transform.rotation;
    }

void Update()
    {
        //_idleThreshold = _speed / _idleThresholdFactor;

        UpdateNoise();
        if (!_isAttacking)
        {
            MoveTowardsPlayer();
        }
    }

    private void MoveTowardsPlayer()
    {
        Vector3 direction = (GameManager.Instance.Player.transform.position - transform.position);
        Quaternion goalRotation = Quaternion.LookRotation(direction);
        transform.rotation = Quaternion.RotateTowards(transform.rotation, goalRotation, _rotateSpeed * Time.deltaTime);
        float diff = direction.magnitude;
        if (diff <= _attackRange && !_isAttacking)
        {
            _animator.SetFloat("Running", 0);
            _animator.SetBool("Idle", false);
            StartCoroutine(Attack());
        }
        else
        {
            Vector3 oldPosition = _rb.position;
            _rb.MovePosition(_rb.position + direction * _speed * Time.deltaTime);
            float dist = Vector3.Distance(oldPosition, _rb.position);
            if (dist > _idleThreshold * Time.deltaTime)
            {
                _animator.SetBool("Idle", false);
                _animator.SetFloat("Running", 1);
            }
            else
            {
                _animator.SetFloat("Running", 0);
                _animator.SetBool("Idle", true);
            }
        }
    }

    private IEnumerator Attack()
    {
        _isAttacking = true;
        _animator.SetBool("Attack", true);
        yield return new WaitForSeconds(1.5f);
        _animator.SetBool("Attack", false);
        // check if actually hit 
        Vector3 direction = (GameManager.Instance.Player.transform.position - transform.position);
        float diff = direction.magnitude;
        if (diff <= _attackRange + 0.5f)
        {
            GameManager.Instance.Player.GetComponent<Character>().PickupItem(null);
        }
        _isAttacking = false;
    }

    private void UpdateNoise()
    {
        if (!_fadeOutNoise)
        {
            _noiseTimer -= Time.deltaTime;

            if (_noiseTimer < 0)
            {
                _noiseTimer = _noiseDelay;
                PlayRandomNoise();
            }
        }
        else
        {
            _audioSource.volume -= _audioSource.volume * Time.deltaTime;
        }
    }

    private void PlayRandomNoise()
    {
        if (!_audioSource.isPlaying)
        {
            _audioSource.clip = Noises[Random.Range(0, Noises.Count)];
            _audioSource.Play();
        }
    }

    private void Die()
    {
        GameObject particleEffect = Instantiate(GameManager.Instance.ZombieDeathByDisableParticleEffect, transform.position, Quaternion.Euler(-90, 0, 0), GameManager.Instance.transform);
        AudioSource audio = particleEffect.GetComponent<AudioSource>();
        audio.clip = GetComponentInParent<ZombieSpawner>().ZombieDeathByDisableSoundeffects[Random.Range(0, GetComponentInParent<ZombieSpawner>().ZombieDeathByDisableSoundeffects.Count)];
        audio.Play();
        Destroy(gameObject);
    }

    public void FadeOutNoise()
    {
        _fadeOutNoise = true;
    }
}