using System.Collections;
using UnityEngine;
using UnityEngine.Events;

[RequireComponent(typeof(AudioSource))]
public class SoundEmitter : MonoBehaviour
{
	private AudioSource _audioSource;

	public event UnityAction<SoundEmitter> OnSoundFinishedPlaying;

	private void Awake()
	{
		_audioSource = this.GetComponent<AudioSource>();
		_audioSource.playOnAwake = false;
	}

	/// <summary>
	/// Instructs the AudioSource to play a single clip, with optional looping, in a position in 3D space.
	/// </summary>
	/// <param name="clip"></param>
	/// <param name="settings"></param>
	/// <param name="hasToLoop"></param>
	/// <param name="position"></param>
	public void PlayAudioClip(AudioClip clip, AudioConfigurationSO settings, bool hasToLoop, Vector3 position = default)
	{
		_audioSource.clip = clip;
		settings.ApplyTo(_audioSource);
		_audioSource.transform.position = position;
		_audioSource.loop = hasToLoop;
		_audioSource.Play();

		if (!hasToLoop)
		{
			StartCoroutine(FinishedPlaying(clip.length));
		}
	}

	/// <summary>
	/// Used when the game is unpaused, to pick up SFX from where they left.
	/// </summary>
	public void Resume()
	{
		_audioSource.Play();
	}

	/// <summary>
	/// Used when the game is paused.
	/// </summary>
	public void Pause()
	{
		_audioSource.Pause();
	}

	/// <summary>
	/// Used when the SFX finished playing. Called by the <c>AudioManager</c>.
	/// </summary>
	public void Stop() // Redundant?
	{
		_audioSource.Stop();
	}

	public void Finish()
	{
		if (_audioSource.loop)
		{
			_audioSource.loop = false;
			float timeRemaining = _audioSource.clip.length - _audioSource.time;
			StartCoroutine(FinishedPlaying(timeRemaining));
		}
	}

	public bool IsInUse()
	{
		return _audioSource.isPlaying;
	}

	public bool IsLooping()
	{
		return _audioSource.loop;
	}

	public bool IsFinishing()
	{
		return !_audioSource.loop;
	}

	IEnumerator FinishedPlaying(float clipLength)
	{
		yield return new WaitForSeconds(clipLength);

		OnSoundFinishedPlaying.Invoke(this); // The AudioManager will pick this up
	}
}