// lib/views/story_viewer/story_viewer_page.dart

import 'package:cached_network_image/cached_network_image.dart';
import 'package:didvan/models/story_model.dart';
import 'package:didvan/services/story_service.dart';
import 'package:didvan/views/widgets/shimmer_placeholder.dart';
import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';

class StoryViewerPage extends StatefulWidget {
  final List<UserStories> stories;
  final int tappedIndex;

  const StoryViewerPage({
    super.key,
    required this.stories,
    required this.tappedIndex,
  });

  @override
  State<StoryViewerPage> createState() => _StoryViewerPageState();
}

class _StoryViewerPageState extends State<StoryViewerPage> {
  late PageController _pageController;

  @override
  void initState() {
    super.initState();
    _pageController = PageController(initialPage: widget.tappedIndex);
  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Directionality(
        textDirection: TextDirection.ltr,
        child: PageView.builder(
          controller: _pageController,
          itemCount: widget.stories.length,
          itemBuilder: (context, index) {
            final userStories = widget.stories[index];
            return UserStoryViewer(
              key: ValueKey(userStories.user.name + index.toString()),
              userStories: userStories,
              onComplete: () {
                if (index < widget.stories.length - 1) {
                  _pageController.nextPage(
                    duration: const Duration(milliseconds: 300),
                    curve: Curves.easeIn,
                  );
                } else {
                  Navigator.of(context).pop();
                }
              },
            );
          },
        ),
      ),
    );
  }
}

class UserStoryViewer extends StatefulWidget {
  final UserStories userStories;
  final VoidCallback onComplete;

  const UserStoryViewer({
    super.key,
    required this.userStories,
    required this.onComplete,
  });

  @override
  State<UserStoryViewer> createState() => _UserStoryViewerState();
}

class _UserStoryViewerState extends State<UserStoryViewer>
    with SingleTickerProviderStateMixin {
  late AnimationController _animationController;
  VideoPlayerController? _videoController;
  int _currentStoryIndex = 0;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(vsync: this);

    // final allStoriesInGroupViewed =
    //     widget.userStories.stories.every((story) => story.isViewed.value);

    // if (allStoriesInGroupViewed) {
    //   for (final story in widget.userStories.stories) {
    //     story.isViewed.value = false;
    //   }
    // }

    _currentStoryIndex =
        widget.userStories.stories.indexWhere((story) => !story.isViewed.value);
    
    if (_currentStoryIndex == -1) {
      _currentStoryIndex = 0;
    }

    _loadStory(story: widget.userStories.stories[_currentStoryIndex]);

    _animationController.addStatusListener((status) {
      if (status == AnimationStatus.completed) {
        _nextStory();
      }
    });
  }

  @override
  void dispose() {
    _animationController.dispose();
    _videoController?.dispose();
    super.dispose();
  }

  void _loadStory({required StoryItem story}) {
    if (!story.isViewed.value) {
      StoryService.markStoryAsViewed(widget.userStories.id, story.id);
      story.isViewed.value = true;
    }

    _animationController.stop();
    _animationController.reset();
    _videoController?.dispose();
    _videoController = null;

    switch (story.media) {
      case MediaType.image:
      case MediaType.gif:
        _animationController.duration = story.duration;
        _animationController.forward();
        break;
      case MediaType.video:
        _videoController =
            VideoPlayerController.networkUrl(Uri.parse(story.url));
        _videoController!.initialize().then((_) {
          if (mounted) {
            setState(() {
              if (_videoController!.value.isInitialized &&
                  _videoController!.value.duration > Duration.zero) {
                _animationController.duration =
                    _videoController!.value.duration;
                _videoController!.play();
                _animationController.forward();
              } else {
                // ignore: avoid_print
                print(
                    "Video failed to initialize or has zero duration. Skipping.");
                _nextStory();
              }
            });
          }
        }).catchError((error) {
          // ignore: avoid_print
          print("Error loading video: $error. Skipping.");
          if (mounted) {
            _nextStory();
          }
        });
        break;
    }
    setState(() {});
  }

  void _nextStory() {
    if (_currentStoryIndex < widget.userStories.stories.length - 1) {
      setState(() {
        _currentStoryIndex++;
      });
      _loadStory(story: widget.userStories.stories[_currentStoryIndex]);
    } else {
      widget.onComplete();
    }
  }

  void _previousStory() {
    if (_currentStoryIndex > 0) {
      setState(() {
        _currentStoryIndex--;
      });
      _loadStory(story: widget.userStories.stories[_currentStoryIndex]);
    }
  }

  void _pauseStory() {
    _animationController.stop();
    _videoController?.pause();
  }

  void _resumeStory() {
    _animationController.forward();
    _videoController?.play();
  }

  @override
  Widget build(BuildContext context) {
    final story = widget.userStories.stories[_currentStoryIndex];
    return Scaffold(
      backgroundColor: Colors.black,
      body: Stack(
        fit: StackFit.expand,
        children: [
          _buildMediaViewer(story),
          Row(
            children: [
              Expanded(
                child: GestureDetector(
                  onTap: _previousStory,
                  onLongPress: _pauseStory,
                  onLongPressUp: _resumeStory,
                  child: Container(color: Colors.transparent),
                ),
              ),
              Expanded(
                child: GestureDetector(
                  onTap: _nextStory,
                  onLongPress: _pauseStory,
                  onLongPressUp: _resumeStory,
                  child: Container(color: Colors.transparent),
                ),
              ),
            ],
          ),
          _buildStoryHeader(),
        ],
      ),
    );
  }

  Widget _buildMediaViewer(StoryItem story) {
    switch (story.media) {
      case MediaType.image:
        return CachedNetworkImage(
            placeholder: (context, url) => const ShimmerPlaceholder(),
            imageUrl: story.url,
            fit: BoxFit.fill,
            width: double.infinity,
            height: double.infinity);
      case MediaType.gif:
        return Image.network(story.url,
            fit: BoxFit.fill, width: double.infinity, height: double.infinity);
      case MediaType.video:
        if (_videoController?.value.isInitialized ?? false) {
          return FittedBox(
              fit: BoxFit.cover,
              child: SizedBox(
                  width: _videoController!.value.size.width,
                  height: _videoController!.value.size.height,
                  child: VideoPlayer(_videoController!)));
        }
        return const Center(child: CircularProgressIndicator());
    }
  }

  Widget _buildStoryHeader() {
    return Positioned(
      top: 35.0,
      left: 10.0,
      right: 10.0,
      child: Column(
        children: [
          Directionality(
            textDirection: TextDirection.ltr,
            child: Row(
              children: widget.userStories.stories
                  .asMap()
                  .map((i, e) {
                    return MapEntry(
                      i,
                      _AnimatedBar(
                        animationController: _animationController,
                        position: i,
                        currentIndex: _currentStoryIndex,
                      ),
                    );
                  })
                  .values
                  .toList(),
            ),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(vertical: 10.0),
            child: _UserInfo(user: widget.userStories.user),
          ),
        ],
      ),
    );
  }
}

class _AnimatedBar extends StatelessWidget {
  final AnimationController animationController;
  final int position;
  final int currentIndex;

  const _AnimatedBar({
    required this.animationController,
    required this.position,
    required this.currentIndex,
  });

  @override
  Widget build(BuildContext context) {
    return Flexible(
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 1.5),
        child: LayoutBuilder(
          builder: (context, constraints) {
            return Stack(
              children: <Widget>[
                Container(
                  height: 6.0,
                  width: double.infinity,
                  decoration: BoxDecoration(
                    color: position < currentIndex
                        ? Colors.white
                        // ignore: deprecated_member_use
                        : Colors.white.withOpacity(0.5),
                    border: Border.all(color: Colors.black26, width: 0.8),
                    borderRadius: BorderRadius.circular(30.0),
                  ),
                ),
                if (position == currentIndex)
                  Align(
                    alignment: Alignment.centerLeft,
                    child: AnimatedBuilder(
                      animation: animationController,
                      builder: (context, child) {
                        return Container(
                          height: 6.0,
                          width:
                              constraints.maxWidth * animationController.value,
                          decoration: BoxDecoration(
                            color: Colors.white,
                            borderRadius: BorderRadius.circular(30.0),
                          ),
                        );
                      },
                    ),
                  ),
              ],
            );
          },
        ),
      ),
    );
  }
}

class _UserInfo extends StatelessWidget {
  final User user;

  const _UserInfo({required this.user});

  @override
  Widget build(BuildContext context) {
    return Row(
      children: <Widget>[
        CircleAvatar(
          radius: 20.0,
          backgroundColor: Colors.grey[300],
          child: ClipOval(
            child: Padding(
              padding: const EdgeInsets.all(0.0),
              child: Image.asset(
                user.profileImageUrl,
                width: 40.0,
                height: 40.0,
                fit: BoxFit.cover,
                errorBuilder: (context, error, stackTrace) {
                  return const Icon(Icons.person,
                      color: Colors.grey, size: 40.0);
                },
              ),
            ),
          ),
        ),
        const SizedBox(width: 10.0),
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                user.name,
                style: const TextStyle(
                  color: Colors.white,
                  fontSize: 18.0,
                  fontWeight: FontWeight.w600,
                ),
              ),
            ],
          ),
        ),
        IconButton(
          icon: const Icon(Icons.close, size: 30.0, color: Colors.white),
          onPressed: () => Navigator.of(context).pop(),
        ),
      ],
    );
  }
}