import 'dart:ui';

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../providers/providers.dart';
import '../../sources/source.dart';

class ComicCover extends ConsumerStatefulWidget {
  const ComicCover({
    super.key,
    required this.url,
    this.sourceId,
    this.width,
    this.height,
    this.fit = BoxFit.cover,
  });

  final String? url;
  final SourceId? sourceId;
  final double? width;
  final double? height;
  final BoxFit fit;

  @override
  ConsumerState<ComicCover> createState() => _ComicCoverState();
}

class _ComicCoverState extends ConsumerState<ComicCover> {
  bool _revealed = false;

  void _setRevealed(bool value) {
    if (_revealed == value) return;
    setState(() => _revealed = value);
  }

  @override
  Widget build(BuildContext context) {
    final peek = ref.watch(peekModeProvider);
    final cache = ref.watch(imageCacheManagerProvider);
    Map<String, String> headers = const {};
    final sid = widget.sourceId;
    if (sid != null) {
      final registry = ref.watch(sourceRegistryProvider);
      if (registry.isEnabled(sid)) {
        headers = registry.get(sid).imageHeaders;
      }
    }
    if (widget.url == null || widget.url!.isEmpty) {
      return Container(
        width: widget.width,
        height: widget.height,
        color: Theme.of(context).colorScheme.surfaceContainerHighest,
        child: const Icon(Icons.menu_book_outlined),
      );
    }

    final image = CachedNetworkImage(
      imageUrl: widget.url!,
      cacheManager: cache,
      httpHeaders: headers,
      width: widget.width,
      height: widget.height,
      fit: widget.fit,
      placeholder: (context, url) => Container(
        width: widget.width,
        height: widget.height,
        color: Theme.of(context).colorScheme.surfaceContainerHighest,
      ),
      errorWidget: (context, url, error) => Container(
        width: widget.width,
        height: widget.height,
        color: Theme.of(context).colorScheme.surfaceContainerHighest,
        child: const Icon(Icons.broken_image_outlined),
      ),
    );

    if (!peek) return image;

    if (_revealed) {
      return GestureDetector(
        behavior: HitTestBehavior.opaque,
        onLongPressEnd: (_) => _setRevealed(false),
        onLongPressCancel: () => _setRevealed(false),
        child: image,
      );
    }

    // Heavy blur + dark veil so covers are unreadable in public.
    return GestureDetector(
      behavior: HitTestBehavior.opaque,
      onLongPressStart: (_) => _setRevealed(true),
      child: SizedBox(
        width: widget.width,
        height: widget.height,
        child: Stack(
          fit: StackFit.expand,
          children: [
            ClipRect(
              child: ImageFiltered(
                imageFilter: ImageFilter.blur(
                  sigmaX: 36,
                  sigmaY: 36,
                  tileMode: TileMode.clamp,
                ),
                child: image,
              ),
            ),
            ColoredBox(
              color: Colors.black.withValues(alpha: 0.45),
              child: const Center(
                child: Icon(
                  Icons.visibility_off,
                  color: Colors.white54,
                  size: 28,
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class PeekModeToggleButton extends ConsumerWidget {
  const PeekModeToggleButton({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final peek = ref.watch(peekModeProvider);
    return IconButton(
      tooltip: peek ? 'Peek mode on (covers hidden)' : 'Peek mode off',
      onPressed: () => ref.read(peekModeProvider.notifier).toggle(),
      icon: Icon(peek ? Icons.visibility_off : Icons.visibility),
    );
  }
}

class ComicGridTile extends StatelessWidget {
  const ComicGridTile({
    super.key,
    required this.comic,
    required this.onTap,
    this.titleMaxLines = 2,
  });

  final CatalogComic comic;
  final VoidCallback onTap;
  final int titleMaxLines;

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(8),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          Expanded(
            child: ClipRRect(
              borderRadius: BorderRadius.circular(8),
              child: ComicCover(url: comic.coverUrl, sourceId: comic.source),
            ),
          ),
          const SizedBox(height: 6),
          Text(
            comic.title,
            maxLines: titleMaxLines,
            overflow: TextOverflow.ellipsis,
            style: Theme.of(context).textTheme.bodyMedium,
          ),
        ],
      ),
    );
  }
}