ICTS_2021/Unity3/Assets/GameCore/Managers/MusicManager.cs

using UnityEngine;
using System.Collections;
using System;

public class MusicManager : MonoBehaviour
{
		#region Unity Singleton
	private static MusicManager _instance;

	public static MusicManager Instance
	{
		get
		{
			if (_instance == null)
			{
				_instance = FindObjectOfType(typeof(MusicManager)) as MusicManager;
				if (_instance == null)
				{
					AVDebug.LogError(string.Format("No gameObject with {0} component exists. Make sure to create a gameObject with {0} component", new System.Diagnostics.StackFrame().GetMethod().DeclaringType));
				}
			}

			return _instance;
		}
	}

	void Awake()
	{
		if (_instance != null && _instance != this)
		{
			AVDebug.LogWarning(string.Format("{0} Instance already exists on another gameObject. Destroying this gameObject {1}", this.GetType().Name, gameObject.name));
			Destroy(gameObject);
			return;
		}

		_instance = this;
		DontDestroyOnLoad(gameObject);
	}
	#endregion

	public AudioClip gameMusic;
	public AudioClip menuMusic;
	int track;
	AudioSource[] sources;
	int currentSource;
	int nextSource;

	void Start()
	{
		sources = (AudioSource[])GetComponents<AudioSource>();
		AVDebug.Assert(sources.Length >= 2, "Make sure you have at least 2 Audio Sources set up on the game object hosting the MusicManager");
		sources[0].clip = menuMusic;
		sources[0].Play();
		sources[currentSource].volume = SoundManager.Instance.MusicVolume;
		nextSource = 1;

		NotificationCenter.AddListener(OnGameStart, NotificationType.GameStart);
		NotificationCenter.AddListener(OnStartSpawningEnemies, NotificationType.StartSpawningEnemies);
		NotificationCenter.AddListener(OnGameOver, NotificationType.GameOver);
		NotificationCenter.AddListener(OnEndTimerStart, NotificationType.CelebrityDisappeared);
	}

	void OnDestroy()
	{
		NotificationCenter.RemoveListener(OnGameStart, NotificationType.GameStart);
		NotificationCenter.RemoveListener(OnStartSpawningEnemies, NotificationType.StartSpawningEnemies);
		NotificationCenter.RemoveListener(OnGameOver, NotificationType.GameOver);
		NotificationCenter.RemoveListener(OnEndTimerStart, NotificationType.CelebrityDisappeared);
	}

    private void OnEndTimerStart(Notification note)
    {
		//sources[currentSource].Stop();
	}

    void FadeTo(AudioClip clip, float fadeTime)
	{
		AudioSource source = sources[nextSource];
		source.clip = clip;
		bool shouldLoop = (clip == menuMusic);
		source.loop = shouldLoop;
		source.Play();
		source.volume = 0;
		currentSource = nextSource;
		nextSource = (++nextSource) % 2;
		source.time = 0; //sources[nextSource].time;
		iTween.Stop(gameObject);
		iTween.ValueTo(gameObject, iTween.Hash(
			"time", fadeTime,
			"from", 0,
			"to", 1,
			"onupdate", "OnFadeUpdate",
			"onupdatetarget", gameObject));
	}

	void OnFadeUpdate(float newVolume)
	{
		int prevSource = nextSource; //since there are only 2, it must be
		if (sources[prevSource].volume != 0) //if it hasn't already been muted
		{
			sources[prevSource].volume = (1 - newVolume) * SoundManager.Instance.MusicVolume; //inverse
		}
		sources[currentSource].volume = newVolume * SoundManager.Instance.MusicVolume;
		if (newVolume == 1)
		{
			sources[prevSource].Stop();
		}
	}

	void FadeOutCurrentSource(float fadeTime)
	{
		iTween.Stop(gameObject);
		iTween.ValueTo(gameObject, iTween.Hash(
			"time", fadeTime,
			"from", 1,
			"to", 0,
			"onupdate", "OnFadeOutCurrentSourceUpdate",
			"onupdatetarget", gameObject));
	}

	void OnFadeOutCurrentSourceUpdate(float newVolume)
	{
		sources[currentSource].volume = newVolume * SoundManager.Instance.MusicVolume;
	}

	public void SetMusicVolume(float value)
	{
		sources[currentSource].volume = value;
		
		if (MenuManager._instance.gameOverSummaryScreen.gameObject.activeSelf)
        {
			Debug.Log("Play");
			sources[currentSource].Play();
		}
		else if (!MenuManager._instance.ad.isActiveAndEnabled)
		{
			sources[currentSource].Play();
		}


	}

	void OnGameStart(Notification note)
	{
		FadeOutCurrentSource(0.5f);
	}

	void OnStartSpawningEnemies(Notification note)
	{
		FadeTo(gameMusic, 0);
	}
        
	void OnGameOver(Notification note)
	{
		FadeTo(menuMusic, 1);
	}
}