using System.Collections;
using UnityEngine;
using UnityEngine.Audio;

namespace OHM.UnityToolkit
{
	public class AudioManager : MonoBehaviour
	{
		public AudioMixer mixer;

		public AudioListener listener;

		public string sfxVolumeParamName;

		public string musicVolumeParamName;

		private AudioSource _currentMusicSource;

		private IEnumerator _crossFadeCoroutine;

		private void Awake()
		{
		}

		public void Setup(bool masterEnabled, bool sfxEnabled, bool musicEnabled)
		{
			SetMasterEnabled(masterEnabled);
			SetGroupEnabled(musicVolumeParamName, musicEnabled);
			SetGroupEnabled(sfxVolumeParamName, sfxEnabled);
		}

		public void SetMasterEnabled(bool enabled)
		{
			if (listener != null)
			{
				listener.enabled = enabled;
			}
		}

		public void SetMusicEnabled(bool enabled)
		{
			SetGroupEnabled(musicVolumeParamName, enabled);
		}

		public void SetSFXEnabled(bool enabled)
		{
			SetGroupEnabled(sfxVolumeParamName, enabled);
		}

		private void SetGroupEnabled(string paramName, bool enabled)
		{
			mixer.SetFloat(paramName, enabled ? 0f : -100f);
		}

		public void StopCurrentMusic()
		{
			if (_currentMusicSource != null)
			{
				_currentMusicSource.Stop();
				_currentMusicSource = null;
			}
		}

		public void PlayMusic(AudioSource source)
		{
			StopCrossFade();
			StopCurrentMusic();
			if (source == null)
			{
				return;
			}
			source.volume = 1f;
			source.Play();
			_currentMusicSource = source;
		}

		private void StopCrossFade()
		{
			if (_crossFadeCoroutine != null)
			{
				StopCoroutine(_crossFadeCoroutine);
				_crossFadeCoroutine = null;
			}
		}

		public void CrossFadeMusic(AudioSource newSource, float duration)
		{
			StopCrossFade();
			_crossFadeCoroutine = CrossFadeCoroutine(_currentMusicSource, newSource, duration);
			_currentMusicSource = newSource;
			StartCoroutine(_crossFadeCoroutine);
		}

		private IEnumerator CrossFadeCoroutine(AudioSource prevSource, AudioSource newSource, float duration)
		{
			if (newSource != null)
			{
				newSource.Play();
			}
			for (float t = 0f; t < duration; t += Time.deltaTime)
			{
				float ratio = t / duration;
				if (prevSource != null)
				{
					prevSource.volume = 1f - ratio;
				}
				if (newSource != null)
				{
					newSource.volume = ratio;
				}
				yield return new WaitForEndOfFrame();
			}
			if (prevSource != null)
			{
				prevSource.Stop();
			}
			_crossFadeCoroutine = null;
		}

	}
}