using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using log4net;
using UnityEditor;
using UnityEngine;

namespace Managers
{
	public class AudioManager : MonoBehaviour
	{
		private static ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

		public static AudioManager G { get; private set; }

		[HideInInspector]
		public AudioLibrary audioLibrary;

		private Dictionary<ManageableAudio, GameObject> audioDictionary =
			new Dictionary<ManageableAudio, GameObject>();

		// Start is called before the first frame update
		void Awake()
		{
			G = this;
			Log.Info("Awake");
			if (gameObject.TryGetComponent(out AudioLibrary al))
			{
				audioLibrary = al;
			}
			else
			{
				Log.Warn("There is no audio library component in the AudioManager. There will be no sound.");
			}
		}
		void Start()
		{
			if (audioLibrary == null)
			{
				return;
			}
			audioDictionary = ReadLibrary(audioLibrary);
		}

		/// <summary>
		/// Instantiates a sound from the library which will be used for global and 
		/// scene independent sound.
		/// </summary>
		/// <param name="prefabName">Name of the sound prefab</param>
		/// <param name="dependsOnScene">Should the audio be destroyed, when the calling scene is destroyed?</param>
		/// <returns>ManageableAudio instance to control the playback with.</returns>
		public ManageableAudio GetGlobalSoundByName(string prefabName, bool dependsOnScene = false)
		{
			return GetGlobalSound(null, -1, false, SearchSound(null, -1, prefabName));
		}

		/// <summary>
		/// Instantiates a sound from the library which will be used for local, spatial and 
		/// scene dependent sound. It reparents the object(AudioSource + ManageableAudio component),
		/// to the provided transform.
		/// </summary>
		/// <param name="prefabName">Name of the sound prefab</param>
		/// <param name="transform">Transform which will parent the sound object.</param>
		/// <returns>ManageableAudio instance to control the playback with.</returns>
		public ManageableAudio GetLocalSoundByName(string prefabName, Transform transform)
		{
			return GetLocalSound(null, -1, transform, SearchSound(null, -1, prefabName));
		}

		/// <summary>
		/// Instantiates a sound from the library which will be used for global sound.
		/// TODO: Only makes sense, if requested prefab has 0 spatial value.
		/// </summary>
		/// <param name="audioTag">Tag of the sound</param>
		/// <param name="id">ID of the sound</param>
		/// <param name="dependsOnScene">Should the audio be destroyed, when the calling scene is destroyed?</param>
		/// <param name="go">Optionally provide the sound GameObject directly.</param>
		/// <returns>ManageableAudio instance to control the playback with.</returns>
		public ManageableAudio GetGlobalSound(string audioTag, int id, bool dependsOnScene = false,
			GameObject go = null)
		{
			GameObject sound;
			if (go == null)
			{
				sound = SearchSound(audioTag, id);
			}
			else
			{
				sound = go;
			}

			if (sound == null)
			{
				Log.Warn($"Requested sound: {audioTag}_{id} was not in the audio library.");
				return null;
			}
			sound = Instantiate(sound);
			if (!dependsOnScene)
				sound.transform.SetParent(gameObject.transform);
			if (sound.TryGetComponent(out ManageableAudio ma))
			{
				return ma;
			}
			else
			{
				Log.Warn($"Prefab for sound: {audioTag}_{id} contained no ManageableAudio component");
				return null;
			}
		}

		/// <summary>
		/// Instantiates a sound from the library which will be used for local, spatial and 
		/// scene dependent sound. It reparents the object(AudioSource + ManageableAudio component),
		/// to the provided transform.
		/// </summary>
		/// <param name="audioTag">Tag of the sound</param>
		/// <param name="id">ID of the sound</param>
		/// <param name="newParent">Transform which will parent the sound object.</param>
		/// <param name="go"> Optionally provide the sound GameObject directly.</param>
		/// <returns>ManageableAudio instance to control the playback with.</returns>
		public ManageableAudio GetLocalSound(string audioTag, int id, Transform newParent,
			GameObject go = null)
		{
			GameObject sound;
			if (go == null)
			{
				sound = SearchSound(audioTag, id);
			}
			else
			{
				sound = go;
			}

			if (sound == null)
			{
				Log.Warn($"Requested sound: {audioTag}_{id} was not in the audio library.");
				return null;
			}
			sound = Instantiate(sound);
			sound.transform.SetParent(newParent, false);

			if (sound.TryGetComponent(out ManageableAudio ma))
			{
				return ma;
			}
			else
			{
				Log.Warn($"Prefab for sound: {audioTag}_{id} contained no ManageableAudio component");
				return null;
			}
		}

		// There are sounds which are scene independent and always global -> will continue playing even if the scene invoking is destroyed
		// -"- scene dependent and global -> will play globally but when the scene is destroyed they will be also destroyed
		// -"- scene dependent and local -> will play spatially from a object and be destroyed when the scene is destroyed

		// 

		Dictionary<ManageableAudio, GameObject> ReadLibrary(AudioLibrary al)
		{
			Dictionary<ManageableAudio, GameObject> audioDictionary =
				new Dictionary<ManageableAudio, GameObject>();
			foreach (GameObject go in al.audios)
			{
				if (go.TryGetComponent(out ManageableAudio ma))
				{
					audioDictionary.Add(ma, go);
				}
			}
			return audioDictionary;
		}

		private GameObject SearchSound(string audioTag = null, int id = -1,
			string prefabName = null)
		{
			if (prefabName == null)
			{
				return audioDictionary.
					Where(manageableAudio => manageableAudio.Key.audioTag == audioTag).
					First(manageableAudio => manageableAudio.Key.id == id).Value;
			}
			else
			{
				return audioDictionary.
					First(manageableAudio => manageableAudio.Value.name == prefabName).Value;
			}

		}

	}

}