import 'dart:io';
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:media_kit/media_kit.dart';
import 'package:media_kit_video/media_kit_video.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart';
import 'package:path/path.dart' as path;
import '../../main.dart';

class VideoPlayerWidget extends StatefulWidget {
  final String videoUrl;
  
  const VideoPlayerWidget({super.key, required this.videoUrl});

  @override
  State<VideoPlayerWidget> createState() => _VideoPlayerWidgetState();
}

class _VideoPlayerWidgetState extends State<VideoPlayerWidget> {
  late final Player _player;
  late final VideoController _controller;
  bool _isInitialized = false;
  bool _hasError = false;
  bool _usingCache = false;
  double _downloadProgress = 0;
  double _bufferingProgress = 0;
  bool _isBuffering = false;
  File? _cachedFile;
  StreamSubscription? _cacheSubscription;

  @override
  void initState() {
    super.initState();
    _initializePlayer();
  }

  Future<void> _initializePlayer() async {
    try {
      _cachedFile = await videoCacheManager.getSingleFile(widget.videoUrl);
      _usingCache = _cachedFile != null;
      
      _player = Player();
      _controller = VideoController(_player);
      
      final source = _cachedFile != null 
          ? Media(_cachedFile!.path, httpHeaders: {}) 
          : Media(widget.videoUrl);
      
      await _player.open(source);
      //await _player.setVolume(0);
      
      if (_cachedFile == null) {
        _cacheVideo();
      }

      _player.stream.error.listen(_handlePlayerError);
      _player.stream.buffering.listen(_handleBufferingUpdate);
      
    } catch (e) {
      _handleError("Player init error: $e");
    }
  }

  void _handleBufferingUpdate(bool isBuffering) {
    setState(() {
      _isBuffering = isBuffering;
      _bufferingProgress = 0;
      
      if (!isBuffering && !_isInitialized && !_hasError) {
        _isInitialized = true;
      }
    });
  }

  void _handlePlayerError(String error) {
    _handleError("Player error: ${error})");
  }

  void _handleError(String message) {
    print(message);
    if (!_hasError) setState(() => _hasError = true);
  }

  Future<void> _cacheVideo() async {
    final fileStream = videoCacheManager.getFileStream(
      widget.videoUrl,
      withProgress: true,
    );

    _cacheSubscription = fileStream.listen((fileResponse) {
      if (fileResponse is DownloadProgress) {
        setState(() => _downloadProgress = fileResponse.progress ?? 0);
      } else if (fileResponse is FileInfo) {
        setState(() {
          _cachedFile = fileResponse.file;
          _usingCache = true;
          _downloadProgress = 0;
        });
      }
    }, onError: (e) => print("Cache error: $e"));
  }

  void _retryPlayback() {
    setState(() {
      _hasError = false;
      _isInitialized = false;
      _downloadProgress = 0;
      _bufferingProgress = 0;
      _cacheSubscription?.cancel();
    });
    _initializePlayer();
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      child: Stack(
        children: [
          // Video display
          if (_isInitialized)
            Video(controller: _controller),
          
          // Loading/buffering states
          if (!_isInitialized || _isBuffering)
            _buildLoadingState(),
          
          // Error state
          if (_hasError)
            _buildErrorState(),
          
          // Cache progress indicator
          if (_downloadProgress > 0 && _downloadProgress < 1)
            _buildCacheProgress(),
            
          // Buffering indicator
          if (_isBuffering && _isInitialized)
            _buildBufferingOverlay(),
        ],
      ),
    );
  }

  Widget _buildLoadingState() {
    return Container(
      color: Colors.black,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            CircularProgressIndicator(
              value: _isBuffering ? _bufferingProgress : null,
              valueColor: const AlwaysStoppedAnimation(Colors.white),
            ),
            const SizedBox(height: 16),
            Text(
              _usingCache ? 'Loading cached video' : 'Streaming video',
              style: const TextStyle(color: Colors.white),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildBufferingOverlay() {
    return Container(
      color: Colors.black54,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            CircularProgressIndicator(
              value: _bufferingProgress,
              valueColor: const AlwaysStoppedAnimation(Colors.white),
            ),
            const SizedBox(height: 8),
            const Text('Buffering...', style: TextStyle(color: Colors.white)),
          ],
        ),
      ),
    );
  }

  Widget _buildCacheProgress() {
    return Positioned(
      bottom: 16,
      right: 16,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        decoration: BoxDecoration(
          color: Colors.black.withOpacity(0.7),
          borderRadius: BorderRadius.circular(20),
        ),
        child: Row(
          children: [
            const Icon(Icons.download, color: Colors.white, size: 20),
            const SizedBox(width: 8),
            Text(
              '${(_downloadProgress * 100).toStringAsFixed(0)}%',
              style: const TextStyle(color: Colors.white),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildErrorState() {
    return Container(
      color: Colors.black,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.videocam_off, size: 64, color: Colors.white54),
            const SizedBox(height: 16),
            const Text('Playback Failed',
              style: TextStyle(color: Colors.white, fontSize: 18)),
            const SizedBox(height: 8),
            Text(
              _usingCache ? 'Cached file may be corrupted' : 'Network issue',
              style: const TextStyle(color: Colors.white70),
            ),
            const SizedBox(height: 16),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                ElevatedButton.icon(
                  icon: const Icon(Icons.refresh),
                  label: const Text('Retry'),
                  onPressed: _retryPlayback,
                ),
                const SizedBox(width: 16),
                if (!_usingCache)
                  ElevatedButton.icon(
                    icon: const Icon(Icons.download),
                    label: const Text('Download'),
                    onPressed: _cacheVideo,
                  ),
              ],
            )
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    _player.dispose();
    _cacheSubscription?.cancel();
    super.dispose();
  }
}