using FMOD.Studio;
using FMODUnity;
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using UnityEditor;
using UnityEngine;
using UnityEngine.SceneManagement;

using STOP_MODE = FMOD.Studio.STOP_MODE;

public class AudioManager : MonoBehaviour
{

    //VCAs (VCA buses) are mainly used for volume control
    //Regular routing buses routing are for the remaining logic, for example, within the FMOD itself to put FMOD events inside the Mixer (Mixer Routing).
    //Regular routing buses are used when we make some attenuation based on parameters and write the logic in code for Unity.

    private VCA masterVCA;
    private VCA musicVCA;
    private VCA sfxVCA;
    private VCA uiVCA;
    private VCA ambienceVCA;

    [SerializeField]
    [Header("Volume")]
    [Range(0, 1)]

    public float MasterVolume = 0.5f;
    [Range(0, 1)]

    public float MusicVolume = 0.5f;
    [Range(0, 1)]

    public float AmbienceVolume = 0.5f;
    [Range(0, 1)]

    public float SFXVolume = 0.5f;
    [Range(0, 1)]

    public float UIVolume = 0.5f;
    [Range(0, 1)]

    private Bus masterBus;
    private Bus ambientBus;
    private Bus musicBus;
    private Bus sfxBus;
    private Bus uiBus;

    const string sid = "00000000-0000-0000-0000-000000000000";
    static readonly Guid nullGuid = new Guid(sid);

    private List<EventInstance> eventInstances = new();
    class TimelineInfo
    {
        public FMOD.StringWrapper LastMarker = new();
    }
    TimelineInfo timelineInfo;
    GCHandle timelineHandle;

    EVENT_CALLBACK beatCallback;

    private static AudioManager _instance { get; set; }
    public static event Action<string> OnNewBGMMarker;
    // public static AudioManager instance;
    private static EventInstance musicEventInstance;


    // public access for the Singleton
    // and lazy instantiation if not exists
    public static AudioManager Instance
    {
        get
        {
            // if exists directly return
            if (_instance) return _instance;

            // otherwise search it in the scene
            _instance = FindObjectOfType<AudioManager>();

            // found it?
            if (_instance) return _instance;

            // otherwise create and initialize it
            CreateInstance();

            return _instance;
        }
    }

    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
    private static void CreateInstance()
    {
        // skip if already exists
        if (_instance) return;
        if (SceneManager.GetActiveScene().name == "BankLoader") return;
        InitializeInstance(new GameObject(nameof(AudioManager)).AddComponent<AudioManager>());
    }

    private static void InitializeInstance(AudioManager instance)
    {
        _instance = instance;
        DontDestroyOnLoad(_instance.gameObject);
        _instance.eventInstances = new List<EventInstance>();


        _instance.masterBus = RuntimeManager.GetBus("bus:/");
        _instance.musicBus = RuntimeManager.GetBus("bus:/Music");
        _instance.ambientBus = RuntimeManager.GetBus("bus:/Ambiences");
        _instance.sfxBus = RuntimeManager.GetBus("bus:/SFX");
        _instance.uiBus = RuntimeManager.GetBus("bus:/UI");


        _instance.masterVCA = RuntimeManager.GetVCA("vca:/Master");
        _instance.musicVCA = RuntimeManager.GetVCA("vca:/Music");
        _instance.ambienceVCA = RuntimeManager.GetVCA("vca:/Ambiences");
        _instance.sfxVCA = RuntimeManager.GetVCA("vca:/SFX");
        _instance.uiVCA = RuntimeManager.GetVCA("vca:/UI");

    }

    public void SetMasterVCA(float value)
    {
        masterVCA.setVolume(value);
    }

    public void SetMusicVCA(float value)
    {
        musicVCA.setVolume(value);
    }

    public void SetAmbientVCA(float value)
    {
        ambienceVCA.setVolume(value);
    }

    public void SetSFXVCA(float value)
    {
        sfxVCA.setVolume(value);
    }

    public void SetUIVCA(float value)
    {
  
        uiVCA.setVolume(value);
    }

    private void Awake()
    {
        if (_instance && _instance != this)
        {
            Destroy(gameObject);
            return;
        }
        InitializeInstance(this);
    }

    public EventInstance CreateInstance(EventReference eventReference)
    {
        EventInstance eventInstance = RuntimeManager.CreateInstance(eventReference);
        eventInstances.Add(eventInstance);
        return eventInstance;
    }

    private void Update()
    {
        //musicBus.setVolume(MusicVolume);
        //ambientBus.setVolume(AmbienceVolume);
        //sfxBus.setVolume(SFXVolume);
        //uiBus.setVolume(UIVolume);
        //masterBus.setVolume(MasterVolume);


        //VCA volumes
        masterVCA.setVolume(MasterVolume);
        ambienceVCA.setVolume(AmbienceVolume);
        musicVCA.setVolume(MusicVolume);
        sfxVCA.setVolume(SFXVolume);
        uiVCA.setVolume(UIVolume);
    }

    public static bool IsEventReferenceValid(EventReference eventReference)
    {
        return eventReference.Guid != nullGuid;
    }
    public static void PlayOneShot(EventReference eventReference)
    {
        if (eventReference.Guid != nullGuid)
            RuntimeManager.PlayOneShot(eventReference);
        else
        {
            Debug.LogWarning("EventReference is null, ignoring...");
        }
    }

    public void PlayOneShot3D(EventReference sound, Vector3 position)
    {
        if (!IsEventReferenceValid(sound))
        {
            Debug.LogWarning("Tried to play invalid FMOD event (3D)");
            return;
        }

        RuntimeManager.PlayOneShot(sound, position);
    }

    public EventInstance PlayAttachedInstance(EventReference sound, GameObject go)
    {
        if (!IsEventReferenceValid(sound))
        {
            Debug.LogWarning("Tried to play invalid FMOD event (attached)");
            return default;
        }

        EventInstance instance = RuntimeManager.CreateInstance(sound);
        RuntimeManager.AttachInstanceToGameObject(instance, go);
        instance.start();
        // instance.release();

        eventInstances.Add(instance);
        return instance;
    }

    public void StopInstance(EventInstance instance, STOP_MODE mode = STOP_MODE.ALLOWFADEOUT)
    {
        if (!instance.isValid()) return;
        instance.stop(mode);
        instance.release();
    }

    public void SetParameter(EventInstance instance, string parameterName, float value)
    {
        if (!instance.isValid()) return;
        instance.setParameterByName(parameterName, value);
    }

    public void SetGlobalParameter(string parameterName, float value)
    {
        RuntimeManager.StudioSystem.setParameterByName(parameterName, value);
    }

    public void InitializeMusic(EventReference musicEventReference)
    {
        if (musicEventReference.Guid == nullGuid)
        {
            Debug.LogWarning("EventReference is null, ignoring.");
            return;
        }
        musicEventInstance = CreateInstance(musicEventReference);
    }

    public void SetMusicParameter(string parameter, float value)
    {
        musicEventInstance.setParameterByName(parameter, value);
    }
    public void StartMusic()
    {
        if (!musicEventInstance.isValid())
        {
            Debug.LogWarning("Music is not initialized yet, ignoring.");
            return;
        }
        musicEventInstance.start();
    }

    public int GetMusicPosition()
    {
        musicEventInstance.getTimelinePosition(out int position);
        return position;
    }

    public void StopSFX()
    {
        sfxBus.stopAllEvents(FMOD.Studio.STOP_MODE.IMMEDIATE);
    }

    public void FadeOutMusic()
    {
        musicEventInstance.stop(FMOD.Studio.STOP_MODE.ALLOWFADEOUT);
        musicEventInstance.release();

    }

    public static bool IsPlaying()
    {
        musicEventInstance.getPlaybackState(out PLAYBACK_STATE state);
        return state != PLAYBACK_STATE.STOPPED;
    }

    public static bool IsPlaying(EventInstance instance)
    {
        instance.getPlaybackState(out PLAYBACK_STATE state);
        return state != PLAYBACK_STATE.STOPPED;
    }
    public static void Unpause()
    {
        musicEventInstance.setPaused(false);
    }

    public static void Unpause(EventInstance instance)
    {
        instance.setPaused(false);
    }

    public static void Pause()
    {
        musicEventInstance.setPaused(true);
    }

    public static void Pause(EventInstance instance)
    {
        instance.setPaused(true);
    }

    private void CleanUp()
    {
        if (eventInstances != null)
        {
            foreach (EventInstance eventInstance in eventInstances)
            {
                eventInstance.stop(FMOD.Studio.STOP_MODE.IMMEDIATE);
                eventInstance.release();
            }
        }

    }
    private void OnDestroy()
    {
        CleanUp();
    }

}