using UnityEngine;
using UnityEngine.Audio;
using AppleHills.Core;
using AppleHills.Core.Interfaces;
using System.Collections.Generic;
using AudioSourceEvents;
using System;
using Core;
using Core.Lifecycle;

public class AudioManager : ManagedBehaviour, 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;

    // ManagedBehaviour configuration
    public override int ManagedAwakePriority => 30; // Audio infrastructure
    public override bool AutoRegisterPausable => true; // Auto-register as IPausable

    internal override void OnManagedAwake()
    {
        // Set instance immediately (early initialization)
        _instance = this;
    }

    internal override void OnManagedStart()
    {
        // Initialize lists if they were not set in inspector
        criticalVOSources = criticalVOSources ?? new List<AppleAudioSource>();
        VOSources = VOSources ?? new List<AppleAudioSource>();
        musicSources = musicSources ?? new List<AppleAudioSource>();
        ambienceSources = ambienceSources ?? new List<AppleAudioSource>();
        SFXSources = SFXSources ?? new List<AppleAudioSource>();

        // Perform singleton-dependent initialization here
        if (QuickAccess.Instance != null)
        {
            _player = QuickAccess.Instance.PlayerGameObject;
            if (QuickAccess.Instance.MainCamera != null)
            {
                _audioListener = QuickAccess.Instance.MainCamera.GetComponent<AudioListener>();
            }
        }
        else
        {
            Logging.Warning("[AudioManager] QuickAccess.Instance is null during OnManagedStart. Some audio references may remain unset.");
        }

        // Diagnostic
        foreach (AppleAudioSource _audioSource in criticalVOSources)
        {
            Logging.Debug("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()
    {
        Logging.Debug("Audio objects: " + FindObjectsByType<LevelAudioObject>(FindObjectsInactive.Include, FindObjectsSortMode.None).Length);
        if (FindObjectsByType<LevelAudioObject>(FindObjectsInactive.Include, FindObjectsSortMode.None).Length > 1)
        {
            Logging.Warning("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)
        {
            Logging.Warning("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)
    {
        // If nothing is playing, let the requested audio source play
        if (currentlyPlayingVO == null)
        {
            SetupNewAudioSource(requestedAudioSource);
            return true;
        }

        // If the requested audio is not critical, and the currently playing audio is, tell the request to get bent
        if (requestedAudioSource.audioSourceType == AppleAudioSource.AudioSourceType.VO && currentlyPlayingVO.audioSourceType == AppleAudioSource.AudioSourceType.CriticalVO)
        {
            return false;
        }
        // If the requested audio source is the same, interrupt and trigger it again
        if (currentlyPlayingVO == requestedAudioSource)
        {
            InterruptAudioSource(requestedAudioSource);
            SetupNewAudioSource(requestedAudioSource);
            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);
            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);
                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);
            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
        {
            return false;
        }
    }

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

    private void SetupNewAudioSource(AppleAudioSource audioSource)
    {
        if (audioSource.audioSource.resource == null)
        {
        }
        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);
        InterruptAllVOSources();
        ResetAudioSource();
        currentlyPlayingVO = newAudioSource;
    }

    private void InterruptAllVOSources()
    {
        foreach (AppleAudioSource source in criticalVOSources)
        {
            if (source == null)
            {
                return;
            }
            else
            {
                source.InterruptAudio("GlobalInterrupt");
            }
                
            
        }
        foreach (AppleAudioSource source in VOSources)
        {
            source.InterruptAudio("GlobalInterrupt");

        }
    }
}