using System.Collections.Generic;
using Core;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using UnityEngine.Playables;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

namespace Cinematics
{
    /// <summary>
    /// Handles loading, playing and unloading cinematics
    /// </summary>
    public class CinematicsManager : MonoBehaviour
    {
        public event System.Action OnCinematicStarted;
        public event System.Action OnCinematicStopped;
        private static CinematicsManager _instance;
        private static bool _isQuitting;
        private Image _cinematicSprites;
        private bool _isCinematicPlaying = false;
        public bool IsCinematicPlaying => _isCinematicPlaying;
        public Image cinematicBackground;

        // Dictionary to track addressable handles by PlayableDirector
        private Dictionary<PlayableDirector, AsyncOperationHandle<PlayableAsset>> _addressableHandles 
            = new Dictionary<PlayableDirector, AsyncOperationHandle<PlayableAsset>>();

        public static CinematicsManager Instance
        {
            get
            {
                if (_instance == null && Application.isPlaying && !_isQuitting)
                {
                    _instance = FindAnyObjectByType<CinematicsManager>();
                    if (_instance == null)
                    {
                        var go = new GameObject("CinematicsManager");
                        _instance = go.AddComponent<CinematicsManager>();
                        // DontDestroyOnLoad(go);
                    }
                }
                return _instance;
            }
        }
        public PlayableDirector playableDirector;

        private void OnEnable()
        {
            // Subscribe to application quit event to ensure cleanup
            Application.quitting += OnApplicationQuit;
        }

        private void OnDisable()
        {
            // Unsubscribe from application quit event
            Application.quitting -= OnApplicationQuit;
            
            // Clean up any remaining addressable handles when disabled
            ReleaseAllHandles();
        }

        private void OnApplicationQuit()
        {
            ReleaseAllHandles();
        }
        
        /// <summary>
        /// Plays a cinematic from an object reference and returns the PlayableDirector playing the timeline
        /// </summary>
        public PlayableDirector PlayCinematic(PlayableAsset assetToPlay)
        {
            _cinematicSprites.enabled = true;
            playableDirector.stopped += OnPlayableDirectorStopped;
            playableDirector.Play(assetToPlay);
            Logging.Debug("Playing cinematic " + assetToPlay.name);
            _isCinematicPlaying = true;
            OnCinematicStarted?.Invoke();
            return playableDirector;
        }

        void OnPlayableDirectorStopped(PlayableDirector director)
        {
            _cinematicSprites.enabled = false;
            Logging.Debug("Cinematic stopped!");
            _isCinematicPlaying = false;
            OnCinematicStopped?.Invoke();
            // Release the addressable handle associated with this director
            ReleaseAddressableHandle(director);
        }

        /// <summary>
        /// Loads a playable from an asset path and plays it as a cinematic
        /// </summary>
        public PlayableDirector LoadAndPlayCinematic(string key)
        {
            playableDirector = GetComponent<PlayableDirector>();
            _cinematicSprites = GetComponentInChildren<Image>(true);
            // Load the asset via addressables
            var handle = Addressables.LoadAssetAsync<PlayableAsset>(key);
            var result = handle.WaitForCompletion();
            
            // Store the handle for later release
            _addressableHandles[playableDirector] = handle;
            
            Logging.Debug($"[CinematicsManager] Loaded addressable cinematic: {key}");
            
            return PlayCinematic(result);
        }

        /// <summary>
        /// Skips the currently playing cinematic if one is active
        /// </summary>
        public void SkipCurrentCinematic()
        {
            if (playableDirector != null && playableDirector.state == PlayState.Playing)
            {
                Logging.Debug("Skipping current cinematic");
                playableDirector.Stop();
            }
        }
        
        /// <summary>
        /// Releases the addressable handle associated with a specific PlayableDirector
        /// </summary>
        private void ReleaseAddressableHandle(PlayableDirector director)
        {
            if (_addressableHandles.TryGetValue(director, out var handle))
            {
                Logging.Debug($"[CinematicsManager] Releasing addressable handle for cinematic");
                Addressables.Release(handle);
                _addressableHandles.Remove(director);
            }
        }
        
        /// <summary>
        /// Releases all active addressable handles
        /// </summary>
        private void ReleaseAllHandles()
        {
            foreach (var handle in _addressableHandles.Values)
            {
                if (handle.IsValid())
                {
                    Addressables.Release(handle);
                }
            }
            _addressableHandles.Clear();
        }

        private void Awake()
        {
            PlayStartCinematicOnGameLoad();
        }
        
        /// <summary>
        /// Loads a cinematic asynchronously while showing a loading screen, then plays it
        /// </summary>
        /// <param name="key">The addressable key of the cinematic to load</param>
        /// <returns>The PlayableDirector playing the cinematic</returns>
        public async System.Threading.Tasks.Task<PlayableDirector> PlayCinematicWithLoadingScreen(string key)
        {
            Logging.Debug($"[CinematicsManager] Preparing to load cinematic with loading screen: {key}");
            
            // First, show the loading screen BEFORE creating any async operations
            UI.LoadingScreenController.Instance.ShowLoadingScreen();
            
            // Give the loading screen a frame to render
            await System.Threading.Tasks.Task.Yield();
            
            // Now create the load handle and track its progress
            Logging.Debug($"[CinematicsManager] Starting cinematic asset load: {key}");
            AsyncOperationHandle<PlayableAsset> handle = Addressables.LoadAssetAsync<PlayableAsset>(key);
            
            // Update the loading screen with the progress provider after the handle is created
            UI.LoadingScreenController.Instance.ShowLoadingScreen(() => handle.PercentComplete);
            
            // Wait for the loading to complete
            var result = await handle.Task;
            
            // Store the handle for later release
            _addressableHandles[playableDirector] = handle;
            
            Logging.Debug($"[CinematicsManager] Cinematic loaded: {key}");
            
            // Hide the loading screen
            UI.LoadingScreenController.Instance.HideLoadingScreen();
            
            // Important: Wait for the loading screen to be fully hidden before playing the cinematic
            await UI.LoadingScreenController.Instance.WaitForLoadingScreenToHideAsync();
            
            Logging.Debug($"[CinematicsManager] Loading screen hidden, now playing cinematic: {key}");
            
            // Play the cinematic
            return PlayCinematic(result);
        }

        private async void PlayStartCinematicOnGameLoad()
        {
            if (!SceneManager.GetActiveScene().name.ToLower().Contains("mainmenu"))
            {
                return;
            }
            
            _instance = this;

            playableDirector = GetComponent<PlayableDirector>();
            _cinematicSprites = GetComponentInChildren<Image>(true);
            
            // Use the new method with loading screen instead of direct load
            await PlayCinematicWithLoadingScreen("IntroSequence");
        }

        public void ShowCinematicBackground(bool showCinematic) 
        {
           if(showCinematic == true)
            {
                var _image = cinematicBackground.GetComponent<Image>();
                _image.enabled = true;
            }
            if (showCinematic == false)
            {
                var _image = cinematicBackground.GetComponent<Image>();
                _image.enabled = false;
            }
        }
    }
}