using AppleHills.Core.Settings;
using Bootstrap;
using Core;
using PuzzleS;
using UnityEngine;
using UnityEngine.Audio;
using AppleHills.Core;
using AppleHills.Core.Interfaces;
using System.Collections.Generic;
using AudioSourceEvents;
using System;

public class AudioManager : MonoBehaviour, IPausable
{
    /// <summary>
    /// Play all audio, just music or no audio at all when the game is paused.
    /// </summary>
    public enum PauseBehavior
    { PlayAllAudio, MusicOnly, NoAudio }

    public PauseBehavior currentPauseBehavior;

    public AudioMixer audioMixer;
    private AudioListener _audioListener;
    public AppleAudioSource currentlyPlayingVO;


    private static AudioManager _instance;
    private GameObject _player;

    public List<AppleAudioSource> criticalVOSources;
    public List<AppleAudioSource> VOSources;
    public List<AppleAudioSource> musicSources;
    public List<AppleAudioSource> ambienceSources;
    public List<AppleAudioSource> SFXSources;

    private IAudioEventSource _eventSource;
    private bool wasInterrupted;

    /// <summary>
    /// Singleton instance of the AudioManager.
    /// </summary>
    public static AudioManager Instance => _instance;

    void Awake()
    {
        _instance = this;

        // Register for post-boot initialization
        BootCompletionService.RegisterInitAction(InitializePostBoot);
        GameManager.Instance.RegisterPausableComponent(this);
    }

    private void InitializePostBoot()
    {

    }

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        _player = QuickAccess.Instance.PlayerGameObject;
        _audioListener = QuickAccess.Instance.MainCamera.GetComponent<AudioListener>();
        foreach (AppleAudioSource _audioSource in criticalVOSources)
        {
            Debug.Log("Found source: " + _audioSource.name);
        }
    }

    public void SetAudioPauseBehavior(PauseBehavior newPauseBehavior)
    {
        switch (newPauseBehavior)
        {
            case PauseBehavior.PlayAllAudio:
                audioMixer.updateMode = AudioMixerUpdateMode.UnscaledTime;
                AudioListener.pause = false;
                break;
            case PauseBehavior.MusicOnly:
                audioMixer.updateMode = AudioMixerUpdateMode.UnscaledTime; break;
            //TODO: Pause all audio mixers except music mixer
            case PauseBehavior.NoAudio:
                audioMixer.updateMode = AudioMixerUpdateMode.Normal;
                AudioListener.pause = true;
                break;

        }
    }

    public LevelAudioObject GetCurrentLevelAudioObject()
    {
        Debug.Log("Audio objects: " + FindObjectsByType<LevelAudioObject>(FindObjectsInactive.Include, FindObjectsSortMode.None).Length);
        if (FindObjectsByType<LevelAudioObject>(FindObjectsInactive.Include, FindObjectsSortMode.None).Length > 1)
        {
            Debug.LogWarning("Warning! More than one LevelAudioObject in the level! Using the first one found");
            return FindObjectsByType<LevelAudioObject>(FindObjectsInactive.Include, FindObjectsSortMode.None)[0];
        }
        if (FindObjectsByType<LevelAudioObject>(FindObjectsInactive.Include, FindObjectsSortMode.None).Length == 0)
        {
            Debug.LogWarning("Error! No LevelAudioObject found, AudioManager might not function properly!");
            return null;
        }
        else
            return FindFirstObjectByType<LevelAudioObject>();
    }



    public void Pause()
    {
        SetAudioPauseBehavior(PauseBehavior.NoAudio);
    }

    public void DoResume()
    {
        SetAudioPauseBehavior(PauseBehavior.PlayAllAudio);
    }

    public void RegisterNewAudioSource(AppleAudioSource newAudioSource)
    {
        switch (newAudioSource.audioSourceType)
        {
            case AppleAudioSource.AudioSourceType.CriticalVO:
                criticalVOSources.Add(newAudioSource);
                break;
            case AppleAudioSource.AudioSourceType.VO:
                VOSources.Add(newAudioSource);
                break;
            case AppleAudioSource.AudioSourceType.SFX:
                SFXSources.Add(newAudioSource);
                break;
            case AppleAudioSource.AudioSourceType.Ambience:
                ambienceSources.Add(newAudioSource);
                break;
            case AppleAudioSource.AudioSourceType.Music:
                musicSources.Add(newAudioSource);
                break;
        }

    }
    /// <summary>
    /// Request playing a VO line. Returns true if whatever is playing is not critical, or weight of requested VO line is lower.
    /// </summary>
    public bool RequestPlayVO(AppleAudioSource requestedAudioSource)
    {
        //Debug.Log($"[AUDIOMANAGER] CurrentVO source prio: {currentlyPlayingVO.sourcePriority}, clip prio: {currentlyPlayingVO.clipPriority} requested VO prio: {requestedAudioSource.sourcePriority}, clip prio: {clipPriority}");
        // If nothing is playing, let the requested audio source play
        if (currentlyPlayingVO == null)
        {
            SetupNewAudioSource(requestedAudioSource);
            Debug.Log($"[AUDIOMANAGER] Playing {currentlyPlayingVO.name} as nothing is currently playing.");
            return true;
        }
        // If the requested audio source is the same, interrupt and trigger it again
        if (currentlyPlayingVO == requestedAudioSource)
        {
            InterruptAudioSource(requestedAudioSource);
            SetupNewAudioSource(requestedAudioSource);
            Debug.Log($"[AUDIOMANAGER] {currentlyPlayingVO.name} is the same as {requestedAudioSource.name}. Triggering it again.");
            return true;

        }
        // if the currently playing audio source is not critical, interrupt it and play the requested audio source
        if (currentlyPlayingVO.audioSourceType != AppleAudioSource.AudioSourceType.CriticalVO)
        {
            
            InterruptAudioSource(requestedAudioSource);
            SetupNewAudioSource(requestedAudioSource);
            Debug.Log($"[AUDIOMANAGER] {currentlyPlayingVO.name} is not critical. Playing {requestedAudioSource.name} instead because it is critical.");
            return true;
        }
        // If the requested audio source has the same priority as currently playing source, check the priority of the requested clip
        if (currentlyPlayingVO.audioSourceType == AppleAudioSource.AudioSourceType.CriticalVO && currentlyPlayingVO.sourcePriority == requestedAudioSource.sourcePriority)
        {
            if (currentlyPlayingVO.clipPriority > requestedAudioSource.clipPriority)
            {
                InterruptAudioSource(requestedAudioSource);
                SetupNewAudioSource(requestedAudioSource);
                Debug.Log($"[AUDIOMANAGER] Interrupted {currentlyPlayingVO.name} because it has same priority as {requestedAudioSource.name} but the requested clip has higher priority");

                return true;
            }
            else
            {
                return false;
            }
        }
        // If the requested audio source has higher priority than the currently playing source, interrupt the current source and let the requested one play
        if (currentlyPlayingVO.audioSourceType == AppleAudioSource.AudioSourceType.CriticalVO && currentlyPlayingVO.sourcePriority > requestedAudioSource.sourcePriority)
        {
            currentlyPlayingVO.InterruptAudio(requestedAudioSource.name);
            Debug.Log($"[AUDIOMANAGER] Interrupted {currentlyPlayingVO.name} because {requestedAudioSource.name} has higher priority");
            InterruptAudioSource(requestedAudioSource);
            SetupNewAudioSource(requestedAudioSource);
            return true;
        }
        // If the requested audio source didn't clear any of the above cases, tell it to get rekt.
        else
        {
            Debug.Log($"[AUDIOMANAGER] {currentlyPlayingVO.name} is still playing. {requestedAudioSource.name} has lower priority");
            return false;
        }
    }

    private void OnApplicationQuit()
    {
        // TODO: Release the handles safely ReleaseAllHandles();
    }

    private void SetupNewAudioSource(AppleAudioSource audioSource)
    {
        if (audioSource.audioSource.resource == null)
        {
            Debug.Log($"[AUDIOMANAGER] Faled to setup {audioSource.name}. Invalid resource");
        }
        else
        {
            currentlyPlayingVO = audioSource;
            _eventSource = audioSource.audioSource.RequestEventHandlers();
            _eventSource.AudioStopped += OnAudioStopped;
            _eventSource.AudioStarted += OnAudioStarted;
        }
    }

    private void OnAudioStopped(object sender, EventArgs e)
    {
        if (wasInterrupted)
        {
            ResetAudioSource();
        }
        else 
        {
            currentlyPlayingVO = null;
            ResetAudioSource();
        }
    }

    private void OnAudioStarted(object sender, EventArgs e)
    {
        
    }

    private void ResetAudioSource()
    {
        _eventSource.AudioStopped -= OnAudioStopped;
        _eventSource.AudioStarted -= OnAudioStarted;
        wasInterrupted = false;
    }

    private void InterruptAudioSource(AppleAudioSource newAudioSource)
    {
        wasInterrupted = true;
        currentlyPlayingVO.InterruptAudio(newAudioSource.name);
        ResetAudioSource();
        currentlyPlayingVO = newAudioSource;
    }
}