import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:cached_video_player_plus/cached_video_player_plus.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart';
import 'package:visibility_detector/visibility_detector.dart';
import 'package:video_player/video_player.dart';
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 CachedVideoPlayerPlus _player;
  bool _isInitialized = false;
  bool _hasError = false;
  bool _usingCache = false;
  double _downloadProgress = 0;
  double _bufferingProgress = 0;
  bool _isBuffering = false;
  File? _cachedFile;
  StreamSubscription? _cacheSubscription;
  bool _showControls = true;
  Timer? _hideTimer;
  bool _isPlaying = true;

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

  Future<void> _initializePlayer() async {
    try {
      _player = CachedVideoPlayerPlus.networkUrl(
        Uri.parse(widget.videoUrl),
        invalidateCacheIfOlderThan: const Duration(days: 60),
      );
      
      await _player.initialize();
      _player.controller.addListener(_videoListener);
      setState(() => _isInitialized = true);
      _player.controller.play();
    } catch (e) {
      _handleError("Player init error: $e");
    }
  }

  void _videoListener() {
    if (!mounted) return;
    
    // Update playing state
    if (_isPlaying != _player.controller.value.isPlaying) {
      setState(() => _isPlaying = _player.controller.value.isPlaying);
    }
    
    // Handle buffering updates
    final isBuffering = _player.controller.value.isBuffering;
    if (isBuffering != _isBuffering) {
      setState(() => _isBuffering = isBuffering);
    }
  }

  void _toggleControls() {
    setState(() => _showControls = !_showControls);
    if (_showControls) {
      _startHideTimer();
    } else {
      _hideTimer?.cancel();
    }
  }

  void _startHideTimer() {
    _hideTimer?.cancel();
    _hideTimer = Timer(const Duration(seconds: 3), () {
      if (mounted) setState(() => _showControls = false);
    });
  }

  void _togglePlayPause() {
    setState(() {
      _isPlaying ? _player.controller.pause() : _player.controller.play();
      _isPlaying = !_isPlaying;
    });
    _startHideTimer();
  }

  Widget _buildControlsOverlay() {
    return AnimatedOpacity(
      opacity: _showControls ? 1.0 : 0.0,
      duration: const Duration(milliseconds: 300),
      child: Stack(
        children: [
          // Play/Pause Center Button
          Positioned.fill(
            child: Center(
              child: IconButton(
                icon: Icon(
                  _isPlaying ? Icons.pause : Icons.play_arrow,
                  size: 48,
                  color: Colors.white.withOpacity(0.8),
                ),
                onPressed: _togglePlayPause,
              ),
            ),
          ),

          // Bottom Controls Bar
          Positioned(
            bottom: 0,
            left: 0,
            right: 0,
            child: Container(
              height: 60,
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  begin: Alignment.bottomCenter,
                  end: Alignment.topCenter,
                  colors: [
                    Colors.black.withOpacity(0.7),
                    Colors.transparent,
                  ],
                ),
              ),
              child: Row(
                children: [
                  Expanded(
                    child: VideoProgressBar(
                      controller: _player.controller,
                      onSeek: (duration) {
                        _player.controller.seekTo(duration);
                        _startHideTimer();
                      },
                    ),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return VisibilityDetector(
      key: Key(widget.videoUrl),
      onVisibilityChanged: (info) => _handleVisibilityChange(info.visibleFraction > 0.5),
      child: GestureDetector(
        onTap: _toggleControls,
        child: Stack(
          alignment: Alignment.center,
          children: [
            // Video Display
            if (_isInitialized)
              Center(
                child: AspectRatio(
                  aspectRatio: _player.controller.value.aspectRatio,
                  child: VideoPlayer(_player.controller),
                ),
              ),

            // Controls Overlay
            if (_isInitialized && !_hasError) _buildControlsOverlay(),

            // 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(),
          ],
        ),
      ),
    );
  }

  // Keep existing helper methods (_handleError, _cacheVideo, _retryPlayback, 
  // _handleVisibilityChange, _buildLoadingState, _buildBufferingOverlay,
  // _buildCacheProgress, _buildErrorState) as provided in original code

   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();
  }

  Future<void> _handleVisibilityChange(bool visible) async {
    if (!visible) {
      await _player.controller.pause();
    }
  }

  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() {
    _hideTimer?.cancel();
    _player.controller.removeListener(_videoListener);
    _player.dispose();
    super.dispose();
  }
}

class VideoProgressBar extends StatelessWidget {
  final VideoPlayerController controller;
  final Function(Duration) onSeek;

  const VideoProgressBar({
    super.key,
    required this.controller,
    required this.onSeek,
  });

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder(
      valueListenable: controller,
      builder: (context, value, child) {
        final position = value.position;
        final duration = value.duration;
        
        return Padding(
          padding: const EdgeInsets.symmetric(horizontal: 16),
          child: Row(
            children: [
              Text(
                _formatDuration(position),
                style: const TextStyle(color: Colors.white),
              ),
              Expanded(
                child: SliderTheme(
                  data: SliderTheme.of(context).copyWith(
                    trackHeight: 2,
                    thumbShape: const RoundSliderThumbShape(enabledThumbRadius: 6),
                  ),
                  child: Slider(
                    min: 0,
                    max: duration.inSeconds.toDouble(),
                    value: position.inSeconds.toDouble().clamp(0, duration.inSeconds.toDouble()),
                    onChanged: (value) => onSeek(Duration(seconds: value.toInt())),
                    onChangeStart: (_) => controller.pause(),
                    onChangeEnd: (_) => controller.play(),
                    activeColor: Colors.red,
                    inactiveColor: Colors.white.withOpacity(0.3),
                  ),
                ),
              ),
              Text(
                _formatDuration(duration),
                style: const TextStyle(color: Colors.white),
              ),
            ],
          ),
        );
      },
    );
  }

  String _formatDuration(Duration duration) {
    String twoDigits(int n) => n.toString().padLeft(2, '0');
    final hours = duration.inHours;
    final minutes = duration.inMinutes.remainder(60);
    final seconds = duration.inSeconds.remainder(60);
    
    return [
      if (hours > 0) twoDigits(hours),
      twoDigits(minutes),
      twoDigits(seconds),
    ].join(':').replaceFirst(RegExp(r'^0:'), '');
  }
}