import 'dart:io';
import 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:image_picker/image_picker.dart';
import 'package:path/path.dart' as p;
import 'package:provider/provider.dart';
import 'package:http/http.dart' as http;
import '../../widgets/fade_in_local_image.dart';
import '../../providers/app_provider.dart';
import '../../models/data_models.dart';
import '../../utils/toast_util.dart';
import '../../utils/user_prefs.dart';
import '../../utils/image_path_helper.dart';
import '../../utils/responsive.dart';
import '../../widgets/genre_selector_page.dart';
import '../../widgets/work_people_section.dart';
import '../../widgets/character_preview_section.dart';
import '../../widgets/character_info_sheet.dart';
import 'book_reviews_page.dart';
import 'book_excerpts_page.dart';
import 'book_share_page.dart';
import '../character/character_list_page.dart';
import '../../data/epub/reader_dao.dart';
import '../epub_reader/epub_highlights_page.dart';
import '../epub_reader/reader_screen.dart';

/// 书籍详情页 - 极简主义设计
class BookDetailPage extends StatefulWidget {
  final Book book;
  final bool embedded;

  const BookDetailPage({super.key, required this.book, this.embedded = false});

  @override
  State<BookDetailPage> createState() => _BookDetailPageState();
}

class _BookDetailPageState extends State<BookDetailPage> {
  late int _detailStyle;
  final ValueNotifier<double> _coverOffset = ValueNotifier(0.0);
  double _coverDragStartOffset = 0.0;
  final ValueNotifier<bool> _draggingCover = ValueNotifier(false);
  final GlobalKey _coverImageKey = GlobalKey();
  double _coverImageHeight = 0.0;
  final ValueNotifier<bool> _showTitle = ValueNotifier(false);
  ScrollController? _overlayScrollController;

  // ─── 角色预览 ───
  List<dynamic> _characters = [];

  // ─── 编辑模式 ───
  bool _isEditing = false;
  final _editFormKey = GlobalKey<FormState>();
  late TextEditingController _titleCtrl;
  late TextEditingController _summaryCtrl;
  late TextEditingController _ratingCtrl;
  late TextEditingController _publisherCtrl;
  late TextEditingController _isbnCtrl;
  List<String> _editAuthors = [];
  List<String> _editTranslators = [];
  List<String> _editGenres = [];
  List<String> _editAlternateTitles = [];
  String? _editCoverPath;
  String _editStatus = 'want_to_read';
  DateTime? _editPublishDate;
  DateTime? _editStartDate;
  DateTime? _editFinishDate;
  bool _editIsDownloading = false;
  final ImagePicker _picker = ImagePicker();

  @override
  void dispose() {
    _coverOffset.dispose();
    _draggingCover.dispose();
    _showTitle.dispose();
    _overlayScrollController?.dispose();
    _titleCtrl.dispose();
    _summaryCtrl.dispose();
    _ratingCtrl.dispose();
    _publisherCtrl.dispose();
    _isbnCtrl.dispose();
    super.dispose();
  }

  @override
  void initState() {
    super.initState();
    _detailStyle = UserPrefs().detailPageStyle;
    _coverOffset.value = UserPrefs().getCoverOffset(widget.book.id);
    _initEditControllers();
    _loadCharacters();
  }

  Future<void> _loadCharacters() async {
    final list = await context.read<AppProvider>().getBookCharacters(widget.book.id);
    if (!mounted) return;
    setState(() => _characters = list);
  }

  void _initEditControllers() {
    final b = widget.book;
    _titleCtrl = TextEditingController(text: b.title);
    _summaryCtrl = TextEditingController(text: b.summary ?? '');
    _ratingCtrl = TextEditingController(text: b.rating?.toString() ?? '');
    _publisherCtrl = TextEditingController(text: b.publisher ?? '');
    _isbnCtrl = TextEditingController(text: b.isbn ?? '');
    _editAuthors = List.from(b.authors);
    _editTranslators = List.from(b.translators);
    _editGenres = List.from(b.genres);
    _editAlternateTitles = List.from(b.alternateTitles);
    _editCoverPath = b.coverPath;
    _editStatus = b.status;
    _editPublishDate = b.publishDate;
    _editStartDate = b.startDate;
    _editFinishDate = b.finishDate;
  }

  void _enterEditMode() {
    final latest = context.read<AppProvider>().books
        .where((b) => b.id == widget.book.id).firstOrNull ?? widget.book;
    _titleCtrl.text = latest.title;
    _summaryCtrl.text = latest.summary ?? '';
    _ratingCtrl.text = latest.rating?.toString() ?? '';
    _publisherCtrl.text = latest.publisher ?? '';
    _isbnCtrl.text = latest.isbn ?? '';
    _editAuthors = List.from(latest.authors);
    _editTranslators = List.from(latest.translators);
    _editGenres = List.from(latest.genres);
    _editAlternateTitles = List.from(latest.alternateTitles);
    _editCoverPath = latest.coverPath;
    _editStatus = latest.status;
    _editPublishDate = latest.publishDate;
    _editStartDate = latest.startDate;
    _editFinishDate = latest.finishDate;
    setState(() => _isEditing = true);
  }

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    final book = context.watch<AppProvider>().books
        .where((b) => b.id == widget.book.id)
        .firstOrNull ?? widget.book;

    if (Breakpoint.isDesktop(context)) {
      return _buildDesktopStyle(book, colors);
    }
    if (_detailStyle == 1) {
      return _buildOverlayStyle(book, colors);
    }
    return _buildStandardStyle(book, colors);
  }

  /// 桌面端左右分栏布局
  Widget _buildDesktopStyle(Book book, ColorScheme colors) {
    if (_isEditing) return _buildDesktopEditStyle(book, colors);
    final hasCover = book.coverPath != null && book.coverPath!.isNotEmpty;
    return Scaffold(
      backgroundColor: colors.surface,
      body: Column(
        children: [
          // 顶栏
          Container(
            height: 48,
            decoration: BoxDecoration(
              color: colors.surface,
              border: Border(bottom: BorderSide(color: colors.outlineVariant, width: 0.5)),
            ),
            child: Row(children: [
              IconButton(
                icon: Icon(Icons.arrow_back, color: colors.onSurface, size: 18),
                onPressed: widget.embedded
                    ? () => context.read<AppProvider>().selectBook(null)
                    : () => Navigator.pop(context),
              ),
              Expanded(
                child: Text(book.title,
                  style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: colors.onSurface),
                  maxLines: 1, overflow: TextOverflow.ellipsis),
              ),
              const SizedBox(width: 4),
            ]),
          ),
          // 主体：左封面 + 右信息
          Expanded(
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // 左侧封面
                Container(
                  width: 240,
                  padding: const EdgeInsets.all(20),
                  child: Column(
                    children: [
                      Container(
                        width: 200,
                        height: 280,
                        decoration: BoxDecoration(
                          color: colors.surfaceContainerHighest,
                          borderRadius: BorderRadius.circular(12),
                          boxShadow: hasCover
                              ? [BoxShadow(color: Colors.black.withValues(alpha: 0.1), blurRadius: 12, offset: const Offset(0, 4))]
                              : null,
                        ),
                        clipBehavior: Clip.antiAlias,
                        child: hasCover
                            ? FadeInLocalImage(path: book.coverPath, fit: BoxFit.cover)
                            : Center(child: Icon(Icons.menu_book, size: 48, color: colors.onSurface.withValues(alpha: 0.25))),
                      ),
                    ],
                  ),
                ),
                // 右侧信息（可滚动）
                Expanded(
                  child: SingleChildScrollView(
                    padding: const EdgeInsets.fromLTRB(0, 20, 24, 80),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(book.title,
                          style: TextStyle(fontSize: 24, fontWeight: FontWeight.w600, color: colors.onSurface, height: 1.3)),
                        if (book.alternateTitles.isNotEmpty) ...[
                          const SizedBox(height: 8),
                          Text(book.alternateTitles.join(' / '),
                            style: TextStyle(fontSize: 14, color: colors.onSurface.withValues(alpha: 0.4), height: 1.4)),
                        ],
                        _buildEpubProgressBar(book),
                        const SizedBox(height: 16),
                        Wrap(spacing: 6, runSpacing: 4, crossAxisAlignment: WrapCrossAlignment.center, children: [
                          if (book.rating != null) ...[
                            Icon(Icons.star, size: 20, color: colors.onSurface),
                            const SizedBox(width: 4),
                            Text(book.rating!.toStringAsFixed(1),
                              style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: colors.onSurface)),
                          ],
                          _buildStatusTag(book),
                        ]),
                        const SizedBox(height: 8),
                        Text('添加于 ${_formatDate(book.createdAt)}',
                          style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.4))),
                        Divider(height: 32, thickness: 0.5, color: colors.outline),
                        // 详细信息
                        _buildDesktopInfoRow('作者', book.authors.join('，'), colors),
                        if (book.translators.isNotEmpty)
                          _buildDesktopInfoRow('译者', book.translators.join('，'), colors),
                        if (book.genres.isNotEmpty) ...[
                          const SizedBox(height: 8),
                          Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
                            SizedBox(width: 56, child: Text('类型', style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.4)))),
                            Expanded(child: Wrap(spacing: 8, runSpacing: 8,
                              children: book.genres.map((g) => Container(
                                padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                                decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(16)),
                                child: Text(g, style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.6))),
                              )).toList(),
                            )),
                          ]),
                        ],
                        if (book.isbn != null && book.isbn!.isNotEmpty)
                          _buildDesktopInfoRow('ISBN', book.isbn!, colors),
                        if (book.publisher != null && book.publisher!.isNotEmpty)
                          _buildDesktopInfoRow('出版社', book.publisher!, colors),
                        if (book.publishDate != null)
                          _buildDesktopInfoRow('出版时间', '${book.publishDate!.year}年${book.publishDate!.month.toString().padLeft(2, '0')}月', colors),
                        if (book.startDate != null || book.finishDate != null) ...[
                          const SizedBox(height: 8),
                          Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
                            SizedBox(width: 56, child: Text('阅读日期', style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.4)))),
                            Expanded(child: Wrap(spacing: 12, runSpacing: 8, children: [
                              if (book.startDate != null) _buildDateChip('开始', book.startDate!, false),
                              if (book.finishDate != null) _buildDateChip('读完', book.finishDate!, false),
                            ])),
                          ]),
                        ],
                        if (book.readCount > 0) ...[
                          const SizedBox(height: 8),
                          Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
                            SizedBox(width: 56, child: Text('阅读次数', style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.4)))),
                            Expanded(child: Text('${book.readCount} 次', style: TextStyle(fontSize: 13, color: colors.onSurface))),
                          ]),
                        ],
                        CharacterPreviewSection(
                          characters: _characters,
                          onTap: _openCharacterSheet,
                        ),
                        WorkPeopleSection(workId: book.id, workType: 'book'),
                        if (book.summary != null && book.summary!.isNotEmpty) ...[
                          Divider(height: 32, thickness: 0.5, color: colors.outline),
                          Row(children: [
                            Container(width: 4, height: 16, decoration: BoxDecoration(color: colors.onSurface, borderRadius: BorderRadius.circular(2))),
                            const SizedBox(width: 8),
                            Text('简介', style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: colors.onSurface)),
                          ]),
                          const SizedBox(height: 12),
                          Text(book.summary!, style: TextStyle(fontSize: 15, color: colors.onSurface, height: 1.8)),
                        ],
                        Divider(height: 32, thickness: 0.5, color: colors.outline),
                        Row(children: [
                          Container(width: 4, height: 16, decoration: BoxDecoration(color: colors.onSurface, borderRadius: BorderRadius.circular(2))),
                          const SizedBox(width: 8),
                          Text('更多', style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: colors.onSurface)),
                        ]),
                        const SizedBox(height: 16),
                        _buildExtraSectionItem(
                          icon: Icons.rate_review_outlined,
                          title: '书评',
                          subtitleFuture: context.read<AppProvider>().getBookReviewCount(book.id),
                          emptyText: '暂无书评',
                          unit: '条书评',
                          onTap: () => _navigateToReviews(book),
                        ),
                        const SizedBox(height: 12),
                        _buildExtraSectionItem(
                          icon: Icons.format_quote_outlined,
                          title: '摘抄',
                          subtitleFuture: context.read<AppProvider>().getBookExcerptCount(book.id),
                          emptyText: '暂无摘抄',
                          unit: '条摘抄',
                          onTap: () => _navigateToExcerpts(book),
                        ),
                        const SizedBox(height: 12),
                        _buildExtraSectionItem(
                          icon: Icons.highlight_outlined,
                          title: '句读',
                          subtitleFuture: _getEpubHighlightCount(book.id),
                          emptyText: '暂无句读',
                          unit: '条句读',
                          onTap: () => _navigateToEpubHighlights(book),
                        ),
                        const SizedBox(height: 12),
                        _buildExtraSectionItem(
                          icon: Icons.people_outline,
                          title: '角色',
                          subtitleFuture: context.read<AppProvider>().getBookCharacterCount(book.id),
                          emptyText: '暂无角色',
                          unit: '个角色',
                          onTap: () => _navigateToCharacters(book),
                        ),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          ),
          // 底部操作栏
          Container(
            height: 56,
            decoration: BoxDecoration(
              color: colors.surface,
              border: Border(top: BorderSide(color: colors.outlineVariant, width: 0.5)),
            ),
            padding: const EdgeInsets.symmetric(horizontal: 24),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [
                _buildEpubReadButtonBar(book, colors),
                OutlinedButton.icon(
                  onPressed: () => _showDeleteDialog(context),
                  icon: Icon(Icons.delete_outline, size: 16, color: colors.error),
                  label: Text('删除', style: TextStyle(color: colors.error)),
                  style: OutlinedButton.styleFrom(
                    side: BorderSide(color: colors.error.withValues(alpha: 0.3)),
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                  ),
                ),
                const SizedBox(width: 12),
                FilledButton.icon(
                  onPressed: _enterEditMode,
                  icon: const Icon(Icons.edit_outlined, size: 16),
                  label: const Text('编辑'),
                  style: FilledButton.styleFrom(
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  // ─── 桌面端编辑模式 ──────────────────────────────────────────

  Widget _buildDesktopEditStyle(Book book, ColorScheme colors) {
    final hasCover = _editCoverPath != null && _editCoverPath!.isNotEmpty;
    return Scaffold(
      backgroundColor: colors.surface,
      body: Form(
        key: _editFormKey,
        child: Column(
          children: [
            Container(
              height: 48,
              decoration: BoxDecoration(color: colors.surface,
                border: Border(bottom: BorderSide(color: colors.outlineVariant, width: 0.5))),
              child: Row(children: [
                IconButton(icon: Icon(Icons.close, color: colors.onSurface, size: 18),
                  onPressed: () => setState(() => _isEditing = false)),
                Expanded(child: Text('编辑书籍',
                  style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: colors.onSurface))),
                FilledButton.icon(onPressed: _saveEdit,
                  icon: const Icon(Icons.check, size: 16), label: const Text('保存'),
                  style: FilledButton.styleFrom(padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)))),
                const SizedBox(width: 12),
              ]),
            ),
            Expanded(
              child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
                // 左侧：封面 + 状态/评分
                Container(width: 240, padding: const EdgeInsets.all(20), child: Column(children: [
                  GestureDetector(onTap: _showEditCoverOptions, child: Container(
                    width: 200, height: 280,
                    decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(12)),
                    clipBehavior: Clip.antiAlias,
                    child: Stack(alignment: Alignment.center, children: [
                      hasCover ? FadeInLocalImage(path: _editCoverPath, fit: BoxFit.cover)
                        : Column(mainAxisAlignment: MainAxisAlignment.center, children: [
                            Icon(Icons.image_outlined, size: 32, color: colors.onSurface.withValues(alpha: 0.25)),
                            const SizedBox(height: 8),
                            Text('点击添加封面', style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.35))),
                          ]),
                      if (_editIsDownloading) Container(color: Colors.black.withValues(alpha: 0.4),
                        child: const CircularProgressIndicator(strokeWidth: 2, color: Colors.white)),
                    ]),
                  )),
                  if (hasCover) Padding(padding: const EdgeInsets.only(top: 8),
                    child: GestureDetector(onTap: () => setState(() => _editCoverPath = null),
                      child: Text('移除封面', style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.5))))),
                  const SizedBox(height: 20),
                  _buildEditSectionLabel('状态', colors),
                  const SizedBox(height: 6),
                  Container(padding: const EdgeInsets.all(2),
                    decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(6)),
                    child: Wrap(spacing: 0, runSpacing: 4, children: [
                      _buildEditStatusChip('想读', 'want_to_read', colors),
                      _buildEditStatusChip('在读', 'reading', colors),
                      _buildEditStatusChip('已读', 'read', colors),
                      _buildEditStatusChip('弃读', 'abandoned', colors),
                    ])),
                  const SizedBox(height: 16),
                  _buildEditSectionLabel('评分', colors),
                  const SizedBox(height: 6),
                  Row(children: [
                    ...List.generate(5, (i) {
                      final starVal = i + 1;
                      final currentRating = double.tryParse(_ratingCtrl.text) ?? 0;
                      final starRating = currentRating / 2;
                      final isFilled = starVal <= starRating;
                      final isHalf = starVal == starRating.ceil() && starRating % 1 != 0;
                      return GestureDetector(onTap: () => setState(() => _ratingCtrl.text = (starVal * 2).toString()),
                        child: Padding(padding: const EdgeInsets.symmetric(horizontal: 1),
                          child: Icon(isHalf ? Icons.star_half : (isFilled ? Icons.star : Icons.star_border),
                            size: 20, color: (isFilled || isHalf) ? const Color(0xFFFFB800) : colors.outline)));
                    }),
                    const SizedBox(width: 8),
                    Container(width: 48, height: 28,
                      decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(6)),
                      child: TextFormField(controller: _ratingCtrl,
                        keyboardType: const TextInputType.numberWithOptions(decimal: true),
                        textAlign: TextAlign.center, inputFormatters: [_RatingInputFormatter()],
                        style: TextStyle(fontSize: 13, fontWeight: FontWeight.w500, color: colors.onSurface),
                        decoration: InputDecoration(hintText: '0-10', hintStyle: TextStyle(fontSize: 11, color: colors.onSurface.withValues(alpha: 0.25)),
                          border: InputBorder.none, contentPadding: const EdgeInsets.symmetric(vertical: 6), isDense: true),
                        onChanged: (_) => setState(() {}))),
                    if (_ratingCtrl.text.isNotEmpty) ...[
                      const SizedBox(width: 4),
                      GestureDetector(onTap: () => setState(() => _ratingCtrl.clear()),
                        child: Icon(Icons.close, size: 14, color: colors.onSurface.withValues(alpha: 0.3))),
                    ],
                  ]),
                ])),
                // 右侧：可滚动表单
                Expanded(child: SingleChildScrollView(
                  padding: const EdgeInsets.fromLTRB(0, 20, 24, 80),
                  child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
                    _buildEditField('名称', _titleCtrl, hint: '书籍名称', required: true),
                    const SizedBox(height: 16),
                    _buildEditChipField('作者', _editAuthors, onTap: () async {
                      final provider = context.read<AppProvider>();
                      final data = provider.books.map((b) => b.authors).toList();
                      final result = await GenreSelectorPage.show(context: context, title: '选择作者',
                        existingTagsFuture: compute(_collectUnique, data), initialSelected: _editAuthors, hint: '如：余华、莫言');
                      if (result != null) setState(() => _editAuthors = result);
                    }),
                    const SizedBox(height: 16),
                    _buildEditChipField('译者', _editTranslators, onTap: () async {
                      final provider = context.read<AppProvider>();
                      final data = provider.books.map((b) => b.translators).toList();
                      final result = await GenreSelectorPage.show(context: context, title: '选择译者',
                        existingTagsFuture: compute(_collectUnique, data), initialSelected: _editTranslators, hint: '如：林少华');
                      if (result != null) setState(() => _editTranslators = result);
                    }),
                    const SizedBox(height: 16),
                    _buildEditChipField('别名', _editAlternateTitles, onTap: () async {
                      final result = await GenreSelectorPage.show(context: context, title: '添加别名',
                        existingTags: [], initialSelected: _editAlternateTitles, hint: '输入别名');
                      if (result != null) setState(() => _editAlternateTitles = result);
                    }),
                    const SizedBox(height: 16),
                    _buildEditChipField('类型', _editGenres, onTap: () async {
                      final provider = context.read<AppProvider>();
                      final tags = await provider.getTags('book_genre', excludeHidden: true);
                      final names = tags.map((t) => t['name'] as String).toList();
                      if (!mounted) return;
                      final result = await GenreSelectorPage.show(context: context, title: '选择类型',
                        existingTags: names, initialSelected: _editGenres, hint: '如：小说、科幻');
                      if (result != null) setState(() => _editGenres = result);
                    }),
                    const SizedBox(height: 16),
                    _buildEditField('出版社', _publisherCtrl, hint: '出版社名称'),
                    const SizedBox(height: 16),
                    _buildEditField('ISBN', _isbnCtrl, hint: 'ISBN编号'),
                    const SizedBox(height: 16),
                    Row(children: [
                      Expanded(child: _buildEditDateField('出版时间', _editPublishDate, (d) => setState(() => _editPublishDate = d))),
                      const SizedBox(width: 12),
                      Expanded(child: _buildEditDateField('开始阅读', _editStartDate, (d) => setState(() => _editStartDate = d), clearable: true)),
                    ]),
                    const SizedBox(height: 16),
                    _buildEditDateField('读完日期', _editFinishDate, (d) => setState(() => _editFinishDate = d), clearable: true),
                    const SizedBox(height: 16),
                    _buildEditSectionLabel('简介', colors),
                    const SizedBox(height: 6),
                    Container(constraints: const BoxConstraints(minHeight: 120),
                      child: TextFormField(controller: _summaryCtrl, maxLines: null,
                        style: TextStyle(fontSize: 14, color: colors.onSurface, height: 1.6),
                        decoration: InputDecoration(hintText: '写下书籍简介...',
                          hintStyle: TextStyle(color: colors.onSurface.withValues(alpha: 0.25)),
                          filled: true, fillColor: colors.surfaceContainerHighest.withValues(alpha: 0.5),
                          border: OutlineInputBorder(borderRadius: BorderRadius.circular(8), borderSide: BorderSide.none),
                          contentPadding: const EdgeInsets.all(12)))),
                  ]),
                )),
              ]),
            ),
            Container(height: 48,
              decoration: BoxDecoration(color: colors.surface,
                border: Border(top: BorderSide(color: colors.outlineVariant, width: 0.5))),
              padding: const EdgeInsets.symmetric(horizontal: 24),
              child: Row(mainAxisAlignment: MainAxisAlignment.end, children: [
                OutlinedButton.icon(onPressed: () => _showDeleteDialog(context),
                  icon: Icon(Icons.delete_outline, size: 16, color: colors.error),
                  label: Text('删除', style: TextStyle(color: colors.error)),
                  style: OutlinedButton.styleFrom(side: BorderSide(color: colors.error.withValues(alpha: 0.3)),
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)))),
              ])),
          ],
        ),
      ),
    );
  }

  Widget _buildEditSectionLabel(String label, ColorScheme colors) {
    return Text(label, style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.4)));
  }

  Widget _buildEditStatusChip(String label, String value, ColorScheme colors) {
    final selected = _editStatus == value;
    return GestureDetector(onTap: () => setState(() => _editStatus = value),
      child: Container(padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
        decoration: BoxDecoration(color: selected ? colors.surface : Colors.transparent,
          borderRadius: BorderRadius.circular(6),
          boxShadow: selected ? [BoxShadow(color: colors.onSurface.withValues(alpha: 0.03), blurRadius: 4, offset: const Offset(0, 2))] : null),
        child: Text(label, style: TextStyle(fontSize: 12, fontWeight: selected ? FontWeight.w500 : FontWeight.normal,
          color: selected ? colors.onSurface : colors.onSurface.withValues(alpha: 0.4)))));
  }

  Widget _buildEditField(String label, TextEditingController ctrl, {String hint = '', bool required = false}) {
    final colors = Theme.of(context).colorScheme;
    return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
      Text(required ? '$label *' : label, style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.4))),
      const SizedBox(height: 6),
      TextFormField(controller: ctrl, style: TextStyle(fontSize: 14, color: colors.onSurface),
        validator: required ? (v) => (v == null || v.trim().isEmpty) ? '请输入$label' : null : null,
        decoration: InputDecoration(hintText: hint, hintStyle: TextStyle(color: colors.onSurface.withValues(alpha: 0.25)),
          filled: true, fillColor: colors.surfaceContainerHighest.withValues(alpha: 0.5),
          border: OutlineInputBorder(borderRadius: BorderRadius.circular(8), borderSide: BorderSide.none),
          contentPadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10), isDense: true)),
    ]);
  }

  Widget _buildEditChipField(String label, List<String> chips, {required VoidCallback onTap}) {
    final colors = Theme.of(context).colorScheme;
    return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
      Text(label, style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.4))),
      const SizedBox(height: 6),
      GestureDetector(onTap: onTap,
        child: Container(width: double.infinity, padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
          decoration: BoxDecoration(color: colors.surfaceContainerHighest.withValues(alpha: 0.5), borderRadius: BorderRadius.circular(8)),
          child: chips.isEmpty
            ? Text('点击选择$label', style: TextStyle(fontSize: 14, color: colors.onSurface.withValues(alpha: 0.25)))
            : Wrap(spacing: 4, runSpacing: 4, children: chips.map((c) => Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                decoration: BoxDecoration(color: colors.surface, borderRadius: BorderRadius.circular(4)),
                child: Text(c, style: TextStyle(fontSize: 12, color: colors.onSurface)))).toList()))),
    ]);
  }

  Widget _buildEditDateField(String label, DateTime? date, ValueChanged<DateTime?> onChanged, {bool clearable = false}) {
    final colors = Theme.of(context).colorScheme;
    final hasDate = date != null;
    return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
      Text(label, style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.4))),
      const SizedBox(height: 6),
      GestureDetector(onTap: () async {
        final picked = await showDatePicker(context: context, initialDate: date ?? DateTime.now(),
          firstDate: DateTime(1900), lastDate: DateTime.now().add(const Duration(days: 365 * 5)));
        if (picked != null) onChanged(picked);
      },
        child: Container(width: double.infinity, padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
          decoration: BoxDecoration(color: colors.surfaceContainerHighest.withValues(alpha: 0.5), borderRadius: BorderRadius.circular(8)),
          child: Row(children: [
            Icon(Icons.calendar_today_outlined, size: 14, color: colors.onSurface.withValues(alpha: 0.4)),
            const SizedBox(width: 8),
            Expanded(child: Text(hasDate ? '${date!.year}.${date!.month.toString().padLeft(2, '0')}.${date!.day.toString().padLeft(2, '0')}' : '\u9009\u62E9\u65E5\u671F',
              style: TextStyle(fontSize: 14, color: hasDate ? colors.onSurface : colors.onSurface.withValues(alpha: 0.25)), overflow: TextOverflow.ellipsis)),
            if (clearable && hasDate) GestureDetector(onTap: () => onChanged(null),
              child: Icon(Icons.close, size: 14, color: colors.onSurface.withValues(alpha: 0.3))),
          ]))),
    ]);
  }

  void _showEditCoverOptions() {
    final colors = Theme.of(context).colorScheme;
    showModalBottomSheet(context: context, backgroundColor: colors.surface,
      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(16))),
      builder: (ctx) => SafeArea(child: Padding(padding: const EdgeInsets.symmetric(vertical: 16),
        child: Column(mainAxisSize: MainAxisSize.min, children: [
          Container(width: 40, height: 4, decoration: BoxDecoration(color: colors.outline, borderRadius: BorderRadius.circular(2))),
          const SizedBox(height: 20),
          Padding(padding: const EdgeInsets.symmetric(horizontal: 24), child: Align(alignment: Alignment.centerLeft,
            child: Text('添加封面', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: colors.onSurface)))),
          const SizedBox(height: 16),
          ListTile(leading: Icon(Icons.photo_library_outlined, color: colors.onSurface.withValues(alpha: 0.6)),
            title: Text('从相册选择', style: TextStyle(color: colors.onSurface)),
            onTap: () { Navigator.pop(ctx); _pickEditCover(); }),
          ListTile(leading: Icon(Icons.link_outlined, color: colors.onSurface.withValues(alpha: 0.6)),
            title: Text('网络链接', style: TextStyle(color: colors.onSurface)),
            onTap: () { Navigator.pop(ctx); _pickEditCoverFromUrl(); }),
        ]))));
  }

  Future<void> _pickEditCover() async {
    try {
      final XFile? picked = await _picker.pickImage(source: ImageSource.gallery, maxWidth: 800, maxHeight: 1200, imageQuality: 85);
      if (picked == null) return;
      final fileName = 'cover_${DateTime.now().millisecondsSinceEpoch}.jpg';
      final targetPath = await ImagePathHelper.instance.getBookCoverPath(widget.book.id, fileName);
      await ImagePathHelper.instance.ensureDirExists(p.dirname(targetPath));
      await File(picked.path).copy(targetPath);
      if (mounted) setState(() => _editCoverPath = targetPath);
    } catch (e) {
      if (mounted) ToastUtil.show(context, '选择封面失败: $e');
    }
  }

  Future<void> _pickEditCoverFromUrl() async {
    final urlCtrl = TextEditingController();
    final confirmed = await showDialog<bool>(context: context, builder: (ctx) {
      final colors = Theme.of(ctx).colorScheme;
      return AlertDialog(backgroundColor: colors.surface, elevation: 0,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        title: Text('添加网络图片', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: colors.onSurface)),
        content: Column(mainAxisSize: MainAxisSize.min, crossAxisAlignment: CrossAxisAlignment.start, children: [
          Text('请输入图片链接地址', style: TextStyle(fontSize: 14, color: colors.onSurface.withValues(alpha: 0.6))),
          const SizedBox(height: 12),
          TextField(controller: urlCtrl, keyboardType: TextInputType.url, style: TextStyle(fontSize: 14, color: colors.onSurface),
            decoration: InputDecoration(hintText: 'https://example.com/image.jpg',
              hintStyle: TextStyle(color: colors.onSurface.withValues(alpha: 0.25)),
              filled: true, fillColor: colors.surfaceContainerHigh,
              contentPadding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
              border: OutlineInputBorder(borderRadius: BorderRadius.circular(10), borderSide: BorderSide.none),
              enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(10), borderSide: BorderSide.none),
              focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(10), borderSide: BorderSide(color: colors.primary, width: 1)))),
        ]),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: Text('取消', style: TextStyle(color: colors.onSurface.withValues(alpha: 0.6)))),
          ElevatedButton(onPressed: () => Navigator.pop(ctx, true),
            style: ElevatedButton.styleFrom(backgroundColor: colors.primary, foregroundColor: colors.onPrimary, elevation: 0,
              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)), padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8)),
            child: const Text('确定')),
        ]);
    });
    final url = urlCtrl.text.trim(); urlCtrl.dispose();
    if (confirmed != true || url.isEmpty) return;
    await _downloadEditCoverFromUrl(url);
  }

  Future<void> _downloadEditCoverFromUrl(String url) async {
    setState(() => _editIsDownloading = true);
    try {
      final response = await http.get(Uri.parse(url), headers: {
        'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15',
        'Accept': 'image/avif,image/webp,image/apng,*/*;q=0.8',
        'Referer': Uri.parse(url).replace(path: '/').toString(),
      });
      if (response.statusCode != 200) throw Exception('下载失败: HTTP ${response.statusCode}');
      final contentType = response.headers['content-type'];
      if (contentType != null && !contentType.startsWith('image/')) throw Exception('链接返回的不是图片');
      if (response.bodyBytes.length > 10 * 1024 * 1024) throw Exception('图片太大');
      final fileName = 'cover_${DateTime.now().millisecondsSinceEpoch}.jpg';
      final targetPath = await ImagePathHelper.instance.getBookCoverPath(widget.book.id, fileName);
      await ImagePathHelper.instance.ensureDirExists(p.dirname(targetPath));
      await File(targetPath).writeAsBytes(response.bodyBytes);
      if (mounted) setState(() => _editCoverPath = targetPath);
    } catch (e) {
      if (mounted) ToastUtil.show(context, '下载失败: $e');
    } finally {
      if (mounted) setState(() => _editIsDownloading = false);
    }
  }

  Future<void> _saveEdit() async {
    if (!_editFormKey.currentState!.validate()) return;
    try {
      final rating = _ratingCtrl.text.isNotEmpty ? double.tryParse(_ratingCtrl.text) : null;
      final updated = widget.book.copyWith(
        title: _titleCtrl.text.trim(),
        coverPath: _editCoverPath,
        authors: _editAuthors,
        translators: _editTranslators,
        alternateTitles: _editAlternateTitles,
        genres: _editGenres,
        publisher: _publisherCtrl.text.trim().isNotEmpty ? _publisherCtrl.text.trim() : null,
        isbn: _isbnCtrl.text.trim().isNotEmpty ? _isbnCtrl.text.trim() : null,
        summary: _summaryCtrl.text.trim(),
        rating: rating,
        status: _editStatus,
        publishDate: _editPublishDate,
        startDate: _editStartDate,
        finishDate: _editFinishDate,
        updatedAt: DateTime.now(),
      );
      await context.read<AppProvider>().updateBook(updated);
      if (!mounted) return;
      ToastUtil.show(context, '更新成功');
      setState(() => _isEditing = false);
    } catch (e) {
      if (mounted) ToastUtil.show(context, '保存失败: $e');
    }
  }

  static List<String> _collectUnique(List<List<String>> lists) {
    final s = <String>{};
    for (final l in lists) { s.addAll(l); }
    return s.toList()..sort();
  }

  Widget _buildDesktopInfoRow(String label, String value, ColorScheme colors) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(width: 56, child: Text(label, style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.4)))),
          Expanded(child: Text(value, style: TextStyle(fontSize: 15, color: colors.onSurface, height: 1.5))),
        ],
      ),
    );
  }

  /// EPUB 阅读按钮（底部栏样式）
  Widget _buildEpubReadButtonBar(Book book, ColorScheme colors) {
    return FutureBuilder<Map<String, dynamic>?>(
      future: ReaderDao().getReaderBookByBookId(book.id),
      builder: (context, snapshot) {
        if (!snapshot.hasData || snapshot.data == null) {
          return const SizedBox.shrink();
        }
        final readerBook = snapshot.data!;
        return Row(children: [
          FilledButton.tonalIcon(
            onPressed: () {
              if (Platform.isWindows) {
                ToastUtil.show(context, 'Windows 桌面客户端暂不支持 EPUB 阅读功能');
                return;
              }
              Navigator.push(context, MaterialPageRoute(
                builder: (_) => ReaderScreen(
                  bookId: readerBook['id'] as String,
                  filePath: readerBook['file_path'] as String,
                  title: readerBook['title'] as String? ?? '',
                  coverPath: readerBook['cover_path'] as String?,
                  bookData: readerBook,
                ),
              ));
            },
            icon: const Icon(Icons.auto_stories_outlined, size: 16),
            label: const Text('EPUB 阅读'),
            style: FilledButton.styleFrom(
              backgroundColor: const Color(0xFF6750A4).withValues(alpha: 0.15),
              foregroundColor: const Color(0xFF6750A4),
              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
            ),
          ),
          const SizedBox(width: 12),
        ]);
      },
    );
  }

  /// 标准样式
  Widget _buildStandardStyle(Book book, ColorScheme colors) {
    final topSafe = MediaQuery.of(context).padding.top;
    return Scaffold(
      backgroundColor: colors.surface,
      body: Stack(
        children: [
          // 整体可滚动（封面 + 内容一起滑动）
          Padding(
            padding: EdgeInsets.only(top: topSafe + 48),
            child: SingleChildScrollView(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // 封面图
                  SizedBox(
                    height: 320,
                    width: double.infinity,
                    child: _buildCoverSection(book),
                  ),
                  // 详细信息
                  _buildBasicInfo(book),
                  Divider(height: 0.5, thickness: 0.5, color: colors.outline),
                  _buildAuthorsSection(book),
                  if (book.translators.isNotEmpty) _buildTranslatorsSection(book),
                  if (book.genres.isNotEmpty) _buildGenresSection(book),
                  if (book.isbn != null && book.isbn!.isNotEmpty) _buildIsbnSection(book),
                  if (book.publisher != null && book.publisher!.isNotEmpty) _buildPublisherSection(book),
                  if (book.publishDate != null) _buildPublishDateSection(book),
                  if (book.startDate != null || book.finishDate != null || book.readCount > 0) _buildReadingDatesSection(book),
                  CharacterPreviewSection(
                    characters: _characters,
                    onTap: _openCharacterSheet,
                  ),
                  WorkPeopleSection(workId: book.id, workType: 'book'),
                  if (book.summary != null && book.summary!.isNotEmpty) _buildSummarySection(book),
                  Divider(height: 0.5, thickness: 0.5, color: colors.outline),
                  _buildExtraSections(book),
                  const SizedBox(height: 120),
                ],
              ),
            ),
          ),
          _buildStandardTopBar(book.title, colors),
          Positioned(right: 16, bottom: 24, child: _buildFloatingActionButtons(book)),
        ],
      ),
    );
  }

  /// 毛玻璃层叠样式：海报背景 + 毛玻璃 + 内容
  Widget _buildOverlayStyle(Book book, ColorScheme colors) {
    final screenH = MediaQuery.of(context).size.height;
    final hasCover = book.coverPath != null && book.coverPath!.isNotEmpty;

    _overlayScrollController ??= ScrollController()..addListener(() {
      final show = (_overlayScrollController?.offset ?? 0) > 10;
      if (_showTitle.value != show) _showTitle.value = show;
    });

    return Scaffold(
      body: Stack(
        children: [
          // 海报背景（高度不够时重复拼接）
          if (hasCover)
            Positioned.fill(
              child: Image(
                image: FileImage(File(book.coverPath!)),
                fit: BoxFit.cover,
                width: double.infinity,
                height: screenH,
                repeat: ImageRepeat.repeatY,
              ),
            )
          else
            Container(color: colors.surfaceContainerHighest),

          // 毛玻璃层
          ClipRect(
            child: BackdropFilter(
              filter: ui.ImageFilter.blur(sigmaX: 25, sigmaY: 25),
              child: Container(color: Colors.black.withValues(alpha: 0.3)),
            ),
          ),

          // 内容
          SafeArea(
            child: Column(
              children: [
                // 顶部栏：只在滚动后显示标题
                SizedBox(
                  height: 48,
                  child: Row(children: [
                    const SizedBox(width: 4),
                    IconButton(
                      icon: Icon(widget.embedded ? Icons.arrow_back : Icons.arrow_back_ios_new, color: Colors.white, size: 18),
                      onPressed: widget.embedded
                          ? () => context.read<AppProvider>().selectBook(null)
                          : () => Navigator.pop(context),
                    ),
                    ValueListenableBuilder<bool>(
                      valueListenable: _showTitle,
                      builder: (_, show, __) => AnimatedOpacity(
                        opacity: show ? 1.0 : 0.0,
                        duration: const Duration(milliseconds: 200),
                        child: ConstrainedBox(
                          constraints: BoxConstraints(maxWidth: MediaQuery.of(context).size.width * 0.5),
                          child: Text(book.title,
                            style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Colors.white),
                            maxLines: 1, overflow: TextOverflow.ellipsis),
                        ),
                      ),
                    ),
                    const Spacer(),
                    _buildStyleButton(),
                  ]),
                ),
                // 可滚动内容
                Expanded(
                  child: SingleChildScrollView(
                    controller: _overlayScrollController,
                    padding: const EdgeInsets.fromLTRB(16, 8, 16, 100),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        // 封面缩略图 + 标题
                        _buildOverlayHeader(book),
                        const SizedBox(height: 20),
                        // 信息区块：无毛玻璃
                        _buildAuthorsSection(book),
                  if (book.translators.isNotEmpty) _buildTranslatorsSection(book),
                        if (book.isbn != null && book.isbn!.isNotEmpty) _buildIsbnSection(book),
                        if (book.publisher != null && book.publisher!.isNotEmpty) _buildPublisherSection(book),
                        if (book.publishDate != null) _buildPublishDateSection(book),
                        if (book.startDate != null || book.finishDate != null || book.readCount > 0) _buildReadingDatesSection(book),
                        // 类型标签毛玻璃
                        if (book.genres.isNotEmpty) _buildGenresSection(book),
                        CharacterPreviewSection(
                          characters: _characters,
                          onTap: _openCharacterSheet,
                          isOverlay: true,
                        ),
                        // 关联人物
                        WorkPeopleSection(workId: book.id, workType: 'book'),
                        // 简介：内部已有毛玻璃卡片
                        if (book.summary != null && book.summary!.isNotEmpty) ...[
                          const SizedBox(height: 12),
                          _buildSummarySection(book),
                        ],
                        const SizedBox(height: 12),
                        const SizedBox(height: 12),
                        // 书评、书摘毛玻璃
                        _buildExtraSectionsOverlay(book),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          ),

          Positioned(right: 16, bottom: 24, child: _buildFloatingActionButtons(book)),
        ],
      ),
    );
  }

  /// 叠层模式顶部：封面小图 + 标题/评分
  Widget _buildOverlayHeader(Book book) {
    final hasCover = book.coverPath != null && book.coverPath!.isNotEmpty;
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        // 封面缩略图
        Container(
          width: 100, height: 140,
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(8),
            boxShadow: [BoxShadow(color: Colors.black.withValues(alpha: 0.3), blurRadius: 12, offset: const Offset(0, 4))],
          ),
          clipBehavior: Clip.antiAlias,
          child: hasCover
              ? FadeInLocalImage(path: book.coverPath, fit: BoxFit.cover)
              : Container(color: Colors.white24, child: const Icon(Icons.menu_book, color: Colors.white38, size: 32)),
        ),
        const SizedBox(width: 16),
        // 标题 + 信息
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const SizedBox(height: 4),
              Text(book.title, style: const TextStyle(fontSize: 22, fontWeight: FontWeight.bold, color: Colors.white)),
              if (book.authors.isNotEmpty) ...[
                const SizedBox(height: 6),
                Text(book.authors.join(' / '), style: TextStyle(fontSize: 14, color: Colors.white.withValues(alpha: 0.6))),
              ],
              const SizedBox(height: 12),
              Row(children: [
                if (book.rating != null && book.rating! > 0) ...[
                  const Icon(Icons.star, size: 16, color: Color(0xFFFFB800)),
                  const SizedBox(width: 4),
                  Text(book.rating!.toStringAsFixed(1), style: const TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: Color(0xFFFFB800))),
                  const SizedBox(width: 16),
                ],
                _statusChip(book.status),
              ]),
            ],
          ),
        ),
      ],
    );
  }

  Widget _buildFloatingActionButtons(Book book) {
    final colors = Theme.of(context).colorScheme;
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        _buildFloatingButton(
          icon: Icons.edit_outlined,
          onPressed: () => _navigateToEdit(context),
          tooltip: '编辑',
          backgroundColor: colors.primary,
          foregroundColor: colors.onPrimary,
        ),
        const SizedBox(height: 12),
        _buildFloatingButton(
          icon: Icons.people_outline,
          onPressed: () => _navigateToCharacters(book),
          tooltip: '角色',
          backgroundColor: colors.secondaryContainer,
          foregroundColor: colors.onSecondaryContainer,
        ),
        const SizedBox(height: 12),
        _buildFloatingButton(
          icon: Icons.delete_outline,
          onPressed: () => _showDeleteDialog(context),
          tooltip: '删除',
          backgroundColor: colors.error,
          foregroundColor: colors.onError,
        ),
        const SizedBox(height: 12),
        _buildEpubReadButton(book),
        if (!Platform.isWindows) ...[
          const SizedBox(height: 12),
          _buildFloatingButton(
            icon: Icons.share_outlined,
            onPressed: () => _showSharePoster(book),
            tooltip: '分享海报',
            backgroundColor: const Color(0xFF4CAF50),
            foregroundColor: Colors.white,
          ),
        ],
      ],
    );
  }

  /// EPUB 阅读悬浮按钮（仅有关联 EPUB 时显示）
  Widget _buildEpubReadButton(Book book) {
    return FutureBuilder<Map<String, dynamic>?>(
      future: ReaderDao().getReaderBookByBookId(book.id),
      builder: (context, snapshot) {
        if (!snapshot.hasData || snapshot.data == null) {
          return const SizedBox.shrink();
        }
        final readerBook = snapshot.data!;
        return _buildFloatingButton(
          icon: Icons.auto_stories_outlined,
          onPressed: () {
            if (Platform.isWindows) {
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(content: Text('Windows 桌面客户端暂不支持 EPUB 阅读功能')),
              );
              return;
            }
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (_) => ReaderScreen(
                  bookId: readerBook['id'] as String,
                  filePath: readerBook['file_path'] as String,
                  title: readerBook['title'] as String? ?? '',
                  coverPath: readerBook['cover_path'] as String?,
                  bookData: readerBook,
                ),
              ),
            );
          },
          tooltip: 'EPUB 阅读',
          backgroundColor: const Color(0xFF6750A4),
          foregroundColor: Colors.white,
        );
      },
    );
  }

  Widget _buildFloatingButton({
    required IconData icon,
    required VoidCallback onPressed,
    required String tooltip,
    required Color backgroundColor,
    required Color foregroundColor,
  }) {
    return Tooltip(
      message: tooltip,
      child: GestureDetector(
        onTap: onPressed,
        child: Container(
          width: 40,
          height: 40,
          decoration: BoxDecoration(
            color: backgroundColor,
            shape: BoxShape.circle,
            boxShadow: [
              BoxShadow(
                color: backgroundColor.withValues(alpha: 0.3),
                blurRadius: 8,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: Icon(icon, size: 18, color: foregroundColor),
        ),
      ),
    );
  }

  /// 固定在顶部的导航栏（纯色，与主体一致）
  Widget _buildStandardTopBar(String title, ColorScheme colors) {
    final topPadding = MediaQuery.of(context).padding.top;
    return Positioned(
      top: 0, left: 0, right: 0,
      child: Container(
        padding: EdgeInsets.only(top: topPadding),
        color: colors.surface,
        child: SizedBox(
          height: 48,
          child: Row(children: [
            const SizedBox(width: 4),
            IconButton(
              icon: Icon(widget.embedded ? Icons.arrow_back : Icons.arrow_back_ios_new, color: colors.onSurface, size: 18),
              onPressed: widget.embedded
                  ? () => context.read<AppProvider>().selectBook(null)
                  : () => Navigator.pop(context),
            ),
            const SizedBox(width: 4),
            Expanded(
              child: Text(title,
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: colors.onSurface),
                maxLines: 1, overflow: TextOverflow.ellipsis),
            ),
            _buildStyleButton(color: colors.onSurface),
          ]),
        ),
      ),
    );
  }

  Widget _buildCoverSection(Book book) {
    final colors = Theme.of(context).colorScheme;
    final hasCover = book.coverPath != null && book.coverPath!.isNotEmpty;
    return LayoutBuilder(
      builder: (context, constraints) {
        final containerH = constraints.maxHeight;
        return GestureDetector(
          onLongPressStart: hasCover ? (_) {
            HapticFeedback.mediumImpact();
            final ctx = _coverImageKey.currentContext;
            if (ctx != null) {
              final box = ctx.findRenderObject() as RenderBox?;
              if (box != null) _coverImageHeight = box.size.height;
            }
            _draggingCover.value = true;
            _coverDragStartOffset = _coverOffset.value;
          } : null,
          onLongPressMoveUpdate: hasCover ? (d) {
            final raw = _coverDragStartOffset + d.offsetFromOrigin.dy;
            final imgH = _coverImageHeight > 0 ? _coverImageHeight : containerH;
            final minOffset = -(imgH - containerH).clamp(0, double.infinity);
            _coverOffset.value = (raw.clamp(minOffset, 0.0) as double);
          } : null,
          onLongPressEnd: hasCover ? (_) {
            _draggingCover.value = false;
            final offset = _coverOffset.value;
            UserPrefs().setCoverOffset(widget.book.id, offset);
            context.read<AppProvider>().updateBookCoverOffset(widget.book.id, offset);
          } : null,
          child: ValueListenableBuilder<double>(
            valueListenable: _coverOffset,
            builder: (context, offset, _) {
              return Stack(
                fit: StackFit.expand,
                children: [
                  if (hasCover)
                    ClipRect(
                      child: Stack(
                        children: [
                          Positioned(
                            top: offset,
                            left: 0, right: 0,
                            child: FadeInLocalImage(
                              key: _coverImageKey,
                              path: book.coverPath,
                              fit: BoxFit.fitWidth,
                              width: constraints.maxWidth,
                            ),
                          ),
                        ],
                      ),
                    )
                  else
                    _buildCoverPlaceholder(),
                  // 底部渐变 + 拖动遮罩
                  ValueListenableBuilder<bool>(
                    valueListenable: _draggingCover,
                    builder: (context, dragging, _) {
                      return Stack(
                        children: [
                          if (!dragging)
                            Positioned(
                              left: 0, right: 0, bottom: 0,
                              child: IgnorePointer(
                                child: Container(
                                  height: 60,
                                  decoration: BoxDecoration(
                                    gradient: LinearGradient(
                                      begin: Alignment.topCenter,
                                      end: Alignment.bottomCenter,
                                      colors: [
                                        colors.surface.withValues(alpha: 0),
                                        colors.surface,
                                      ],
                                    ),
                                  ),
                                ),
                              ),
                            ),
                          if (dragging) ...[
                            Positioned.fill(
                              child: Container(color: Colors.black.withValues(alpha: 0.3)),
                            ),
                            Positioned(
                              left: 0, right: 0, bottom: 20,
                              child: Center(
                                child: Container(
                                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
                                  decoration: BoxDecoration(
                                    color: Colors.black.withValues(alpha: 0.6),
                                    borderRadius: BorderRadius.circular(20),
                                  ),
                                  child: const Text('上下滑动调整图片位置',
                                      style: TextStyle(fontSize: 13, color: Colors.white70)),
                                ),
                              ),
                            ),
                          ],
                        ],
                      );
                    },
                  ),
                ],
              );
            },
          ),
        );
      },
    );
  }

  Widget _buildCoverPlaceholder() {
    final colors = Theme.of(context).colorScheme;
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(
            Icons.menu_book,
            size: 64,
            color: colors.onSurface.withValues(alpha: 0.25),
          ),
          const SizedBox(height: 16),
          Text(
            '暂无封面',
            style: TextStyle(
              fontSize: 14,
              color: colors.onSurface.withValues(alpha: 0.4),
            ),
          ),
        ],
      ),
    );
  }

  /// 样式选择按钮
  Widget _buildStyleButton({Color color = Colors.white}) {
    return IconButton(
      icon: Icon(Icons.tune, color: color, size: 20),
      tooltip: '切换样式',
      onPressed: _showStylePicker,
    );
  }

  void _showStylePicker() {
    final colors = Theme.of(context).colorScheme;
    const names = ['默认样式', '毛玻璃层叠'];
    const icons = [Icons.article_outlined, Icons.blur_on_outlined];
    const subtitles = ['标准封面顶部布局', '封面背景 + 毛玻璃卡片'];
    showModalBottomSheet(
      context: context,
      backgroundColor: colors.surface,
      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(16))),
      builder: (ctx) => Padding(
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
        child: Column(mainAxisSize: MainAxisSize.min, children: [
          Container(width: 36, height: 4, decoration: BoxDecoration(color: colors.onSurface.withValues(alpha: 0.15), borderRadius: BorderRadius.circular(2))),
          const SizedBox(height: 20),
          Align(alignment: Alignment.centerLeft, child: Text('详情页样式', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: colors.onSurface))),
          const SizedBox(height: 12),
          for (int i = 0; i < names.length; i++) ...[
            if (i > 0) Divider(height: 0.5, color: colors.outlineVariant),
            ListTile(
              contentPadding: EdgeInsets.zero,
              leading: Container(width: 36, height: 36, decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(10)),
                  child: Icon(icons[i], size: 20, color: _detailStyle == i ? colors.primary : colors.onSurface.withValues(alpha: 0.6))),
              title: Text(names[i], style: TextStyle(fontSize: 13, fontWeight: _detailStyle == i ? FontWeight.w600 : FontWeight.w500, color: colors.onSurface)),
              subtitle: Text(subtitles[i], style: TextStyle(fontSize: 11, color: colors.onSurface.withValues(alpha: 0.4))),
              trailing: _detailStyle == i
                  ? Icon(Icons.check_circle, size: 20, color: colors.primary)
                  : Icon(Icons.chevron_right, color: colors.onSurface.withValues(alpha: 0.25)),
              onTap: () { setState(() => _detailStyle = i); UserPrefs().setDetailPageStyle(i); Navigator.pop(ctx); },
            ),
          ],
          const SizedBox(height: 12),
        ]),
      ),
    );
  }

  Widget _statusChip(String status) {
    final colors = Theme.of(context).colorScheme;
    final (label, bg, fg) = switch (status) {
      'read' => ('已读', colors.primary, colors.onPrimary),
      'reading' => ('在读', colors.outlineVariant, colors.onSurface.withValues(alpha: 0.6)),
      'want_to_read' => ('想读', colors.surfaceContainerHighest, colors.onSurface.withValues(alpha: 0.4)),
      'abandoned' => ('弃读', colors.error.withValues(alpha: 0.15), colors.error),
      _ => ('', colors.surfaceContainerHighest, colors.onSurface.withValues(alpha: 0.3)),
    };
    if (label.isEmpty) return const SizedBox.shrink();
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
      decoration: BoxDecoration(color: bg, borderRadius: BorderRadius.circular(12)),
      child: Text(label, style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: fg)),
    );
  }

  /// EPUB 阅读进度条（仅有关联 EPUB 时显示）
  Widget _buildEpubProgressBar(Book book) {
    final colors = Theme.of(context).colorScheme;
    return FutureBuilder<Map<String, dynamic>?>(
      future: ReaderDao().getReaderBookByBookId(book.id),
      builder: (context, snapshot) {
        if (!snapshot.hasData || snapshot.data == null) {
          return const SizedBox.shrink();
        }
        final progress = (snapshot.data!['reading_percentage'] as num?)?.toDouble() ?? 0.0;
        if (progress <= 0) return const SizedBox.shrink();
        return Padding(
          padding: const EdgeInsets.only(top: 12),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(2),
            child: LinearProgressIndicator(
              value: progress,
              minHeight: 3,
              backgroundColor: colors.surfaceContainerHighest,
            ),
          ),
        );
      },
    );
  }

  Widget _buildBasicInfo(Book book) {
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            book.title,
            style: TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.w600,
              color: colors.onSurface,
              height: 1.3,
            ),
          ),
          if (book.alternateTitles.isNotEmpty) ...[
            const SizedBox(height: 8),
            Text(
              book.alternateTitles.join(' / '),
              style: TextStyle(
                fontSize: 14,
                color: colors.onSurface.withValues(alpha: 0.4),
                height: 1.4,
              ),
            ),
          ],
          // EPUB 阅读进度条
          _buildEpubProgressBar(book),
          const SizedBox(height: 16),
          Row(
            children: [
              if (book.rating != null) ...[
                Icon(
                  Icons.star,
                  size: 20,
                  color: colors.onSurface,
                ),
                const SizedBox(width: 4),
                Text(
                  book.rating!.toStringAsFixed(1),
                  style: TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.w600,
                    color: colors.onSurface,
                  ),
                ),
                const SizedBox(width: 16),
              ],
              _buildStatusTag(book),
            ],
          ),
          const SizedBox(height: 8),
          Text(
            '添加于 ${_formatDate(book.createdAt)}',
            style: TextStyle(
              fontSize: 12,
              color: colors.onSurface.withValues(alpha: 0.4),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildStatusTag(Book book) {
    final colors = Theme.of(context).colorScheme;
    String label;
    Color bgColor;
    Color textColor;
    switch (book.status) {
      case 'read':
        label = '已读';
        bgColor = colors.primary;
        textColor = colors.onPrimary;
        break;
      case 'reading':
        label = '在读';
        bgColor = colors.outlineVariant;
        textColor = colors.onSurface.withValues(alpha: 0.6);
        break;
      case 'want_to_read':
        label = '想读';
        bgColor = colors.surfaceContainerHighest;
        textColor = colors.onSurface.withValues(alpha: 0.4);
        break;
      case 'abandoned':
        label = '弃读';
        bgColor = colors.error.withValues(alpha: 0.15);
        textColor = colors.error;
        break;
      default:
        label = '未知';
        bgColor = colors.outlineVariant;
        textColor = colors.onSurface.withValues(alpha: 0.25);
    }

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
      decoration: BoxDecoration(
        color: bgColor,
        borderRadius: BorderRadius.circular(6),
      ),
      child: Text(
        label,
        style: TextStyle(
          fontSize: 12,
          color: textColor,
          fontWeight: FontWeight.w600,
        ),
      ),
    );
  }

  Widget _buildAuthorsSection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 64,
            child: Text(
              '作者',
              style: TextStyle(
                fontSize: 13,
                color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
              ),
            ),
          ),
          Expanded(
            child: Text(
              book.authors.join('，'),
              style: TextStyle(
                fontSize: 15,
                color: isOverlay ? Colors.white : colors.onSurface,
                height: 1.5,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildTranslatorsSection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 64,
            child: Text(
              '译者',
              style: TextStyle(
                fontSize: 13,
                color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
              ),
            ),
          ),
          Expanded(
            child: Text(
              book.translators.join('，'),
              style: TextStyle(
                fontSize: 15,
                color: isOverlay ? Colors.white : colors.onSurface,
                height: 1.5,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildIsbnSection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 64,
            child: Text(
              'ISBN',
              style: TextStyle(
                fontSize: 13,
                color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
              ),
            ),
          ),
          Expanded(
            child: Text(
              book.isbn!,
              style: TextStyle(
                fontSize: 15,
                color: isOverlay ? Colors.white : colors.onSurface,
                height: 1.5,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildPublisherSection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 64,
            child: Text(
              '出版社',
              style: TextStyle(
                fontSize: 13,
                color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
              ),
            ),
          ),
          Expanded(
            child: Text(
              book.publisher!,
              style: TextStyle(
                fontSize: 15,
                color: isOverlay ? Colors.white : colors.onSurface,
                height: 1.5,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildPublishDateSection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 64,
            child: Text(
              '出版时间',
              style: TextStyle(
                fontSize: 13,
                color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
              ),
            ),
          ),
          Expanded(
            child: Text(
              '${book.publishDate!.year}年${book.publishDate!.month.toString().padLeft(2, '0')}月',
              style: TextStyle(
                fontSize: 15,
                color: isOverlay ? Colors.white : colors.onSurface,
                height: 1.5,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildReadingDatesSection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Column(
      children: [
        if (book.startDate != null || book.finishDate != null)
          Padding(
            padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                SizedBox(
                  width: 64,
                  child: Text(
                    '阅读日期',
                    style: TextStyle(
                      fontSize: 13,
                      color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
                    ),
                  ),
                ),
                Expanded(
                  child: Wrap(
                    spacing: 12,
                    runSpacing: 8,
                    children: [
                      if (book.startDate != null)
                        _buildDateChip('开始', book.startDate!, isOverlay),
                      if (book.finishDate != null)
                        _buildDateChip('读完', book.finishDate!, isOverlay),
                    ],
                  ),
                ),
              ],
            ),
          ),
        if (book.readCount > 0)
          Padding(
            padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 4),
            child: Row(
              children: [
                SizedBox(
                  width: 64,
                  child: Text(
                    '阅读次数',
                    style: TextStyle(
                      fontSize: 13,
                      color: isOverlay ? const Color(0x66FFFFFF) : colors.onSurface.withValues(alpha: 0.4),
                    ),
                  ),
                ),
                Expanded(
                  child: Text(
                    '${book.readCount} 次',
                    style: TextStyle(fontSize: 13, color: isOverlay ? Colors.white70 : colors.onSurface),
                  ),
                ),
              ],
            ),
          ),
      ],
    );
  }

  Widget _buildDateChip(String label, DateTime date, bool isOverlay) {
    final colors = Theme.of(context).colorScheme;
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
      decoration: BoxDecoration(
        color: isOverlay ? Colors.white.withValues(alpha: 0.12) : colors.surfaceContainerHighest,
        borderRadius: BorderRadius.circular(6),
      ),
      child: Text(
        '$label ${_formatDate(date)}',
        style: TextStyle(
          fontSize: 13,
          color: isOverlay ? Colors.white.withValues(alpha: 0.85) : colors.onSurface.withValues(alpha: 0.7),
        ),
      ),
    );
  }

  Widget _buildGenresSection(Book book) {
    final isOverlay = _detailStyle == 1;
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 24, vertical: isOverlay ? 5 : 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 48,
            child: Text('类型', style: TextStyle(fontSize: 13,
                color: isOverlay ? const Color(0x66FFFFFF) : Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.4))),
          ),
          Expanded(
            child: Wrap(
              spacing: 8, runSpacing: 8,
              children: book.genres.map((g) => _buildGenreChip(g, isOverlay)).toList(),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildGenreChip(String label, bool isOverlay) {
    if (isOverlay) {
      return ClipRRect(
        borderRadius: BorderRadius.circular(16),
        child: BackdropFilter(
          filter: ui.ImageFilter.blur(sigmaX: 10, sigmaY: 10),
          child: Container(
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
            decoration: BoxDecoration(
              color: Colors.white.withValues(alpha: 0.12),
              borderRadius: BorderRadius.circular(16),
            ),
            child: Text(label, style: TextStyle(fontSize: 13, color: Colors.white.withValues(alpha: 0.85))),
          ),
        ),
      );
    }
    final colors = Theme.of(context).colorScheme;
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
      decoration: BoxDecoration(
        color: colors.surfaceContainerHighest,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Text(label, style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.6))),
    );
  }

  Widget _buildSummarySection(Book book) {
    final isOverlay = _detailStyle == 1;
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                width: 4,
                height: 16,
                decoration: BoxDecoration(
                  color: isOverlay ? Colors.white : colors.onSurface,
                  borderRadius: BorderRadius.circular(2),
                ),
              ),
              const SizedBox(width: 8),
              Text(
                '简介',
                style: TextStyle(
                  fontSize: 15,
                  fontWeight: FontWeight.w600,
                  color: isOverlay ? Colors.white : colors.onSurface,
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          ClipRRect(
            borderRadius: BorderRadius.circular(12),
            child: BackdropFilter(
              filter: ui.ImageFilter.blur(sigmaX: 15, sigmaY: 15),
              child: Container(
                padding: const EdgeInsets.all(20),
                decoration: BoxDecoration(
                  color: Colors.white.withValues(alpha: 0.08),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: Text(
                  book.summary!,
                  style: TextStyle(
                    fontSize: 15,
                    color: isOverlay ? Colors.white : colors.onSurface,
                    height: 1.8,
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildExtraSections(Book book) {
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: const EdgeInsets.all(24),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                width: 4,
                height: 16,
                decoration: BoxDecoration(
                  color: colors.onSurface,
                  borderRadius: BorderRadius.circular(2),
                ),
              ),
              const SizedBox(width: 8),
              Text(
                '更多',
                style: TextStyle(
                  fontSize: 15,
                  fontWeight: FontWeight.w600,
                  color: colors.onSurface,
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          _buildExtraSectionItem(
            icon: Icons.rate_review_outlined,
            title: '书评',
            subtitleFuture: context.read<AppProvider>().getBookReviewCount(book.id),
            emptyText: '暂无书评',
            unit: '条书评',
            onTap: () => _navigateToReviews(book),
          ),
          const SizedBox(height: 12),
          _buildExtraSectionItem(
            icon: Icons.format_quote_outlined,
            title: '摘抄',
            subtitleFuture: context.read<AppProvider>().getBookExcerptCount(book.id),
            emptyText: '暂无摘抄',
            unit: '条摘抄',
            onTap: () => _navigateToExcerpts(book),
          ),
          const SizedBox(height: 12),
          _buildExtraSectionItem(
            icon: Icons.highlight_outlined,
            title: '句读',
            subtitleFuture: _getEpubHighlightCount(book.id),
            emptyText: '暂无句读',
            unit: '条句读',
            onTap: () => _navigateToEpubHighlights(book),
          ),
          const SizedBox(height: 12),
          _buildExtraSectionItem(
            icon: Icons.people_outline,
            title: '角色',
            subtitleFuture: context.read<AppProvider>().getBookCharacterCount(book.id),
            emptyText: '暂无角色',
            unit: '个角色',
            onTap: () => _navigateToCharacters(book),
          ),
        ],
      ),
    );
  }

  /// EPUB 阅读入口（通过关联的 reader_books）
  /// 叠层模式：书评、摘抄各自独立毛玻璃卡片
  Widget _buildExtraSectionsOverlay(Book book) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 24),
      child: Column(
        children: [
          _buildFrostedExtraItem(
            icon: Icons.rate_review_outlined,
            title: '书评',
            subtitleFuture: context.read<AppProvider>().getBookReviewCount(book.id),
            emptyText: '暂无书评',
            unit: '条书评',
            onTap: () => _navigateToReviews(book),
          ),
          const SizedBox(height: 12),
          _buildFrostedExtraItem(
            icon: Icons.format_quote_outlined,
            title: '摘抄',
            subtitleFuture: context.read<AppProvider>().getBookExcerptCount(book.id),
            emptyText: '暂无摘抄',
            unit: '条摘抄',
            onTap: () => _navigateToExcerpts(book),
          ),
          const SizedBox(height: 12),
          _buildFrostedExtraItem(
            icon: Icons.highlight_outlined,
            title: '句读',
            subtitleFuture: _getEpubHighlightCount(book.id),
            emptyText: '暂无句读',
            unit: '条句读',
            onTap: () => _navigateToEpubHighlights(book),
          ),
          const SizedBox(height: 12),
          _buildFrostedExtraItem(
            icon: Icons.people_outline,
            title: '角色',
            subtitleFuture: context.read<AppProvider>().getBookCharacterCount(book.id),
            emptyText: '暂无角色',
            unit: '个角色',
            onTap: () => _navigateToCharacters(book),
          ),
        ],
      ),
    );
  }

  /// 毛玻璃书评/摘抄卡片
  Widget _buildFrostedExtraItem({
    required IconData icon,
    required String title,
    required Future<int> subtitleFuture,
    required String emptyText,
    required String unit,
    required VoidCallback onTap,
  }) {
    return ClipRRect(
      borderRadius: BorderRadius.circular(12),
      child: BackdropFilter(
        filter: ui.ImageFilter.blur(sigmaX: 15, sigmaY: 15),
        child: Container(
          decoration: BoxDecoration(
            color: Colors.white.withValues(alpha: 0.08),
            borderRadius: BorderRadius.circular(12),
          ),
          child: Material(
            color: Colors.transparent,
            child: InkWell(
              onTap: onTap,
              borderRadius: BorderRadius.circular(12),
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
                child: Row(children: [
                  Icon(icon, size: 20, color: Colors.white.withValues(alpha: 0.7)),
                  const SizedBox(width: 12),
                  Expanded(
                    child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
                      Text(title, style: const TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: Colors.white)),
                      FutureBuilder<int>(
                        future: subtitleFuture,
                        builder: (ctx, snap) {
                          final count = snap.data ?? 0;
                          return Text(count > 0 ? '$count $unit' : emptyText,
                            style: TextStyle(fontSize: 12, color: Colors.white.withValues(alpha: 0.5)));
                        },
                      ),
                    ]),
                  ),
                  Icon(Icons.chevron_right, size: 16, color: Colors.white.withValues(alpha: 0.3)),
                ]),
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildExtraSectionItem({
    required IconData icon,
    required String title,
    required Future<int> subtitleFuture,
    required String emptyText,
    required String unit,
    required VoidCallback onTap,
  }) {
    final colors = Theme.of(context).colorScheme;
    return GestureDetector(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.all(16),
        decoration: BoxDecoration(
          color: colors.surfaceContainerHigh,
          borderRadius: BorderRadius.circular(10),
          border: Border.all(color: colors.outlineVariant, width: 0.5),
        ),
        child: Row(
          children: [
            Container(
              width: 40,
              height: 40,
              decoration: BoxDecoration(
                color: colors.surface,
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: colors.outlineVariant, width: 0.5),
              ),
              child: Icon(
                icon,
                size: 20,
                color: colors.onSurface.withValues(alpha: 0.6),
              ),
            ),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    title,
                    style: TextStyle(
                      fontSize: 15,
                      fontWeight: FontWeight.w600,
                      color: colors.onSurface,
                    ),
                  ),
                  const SizedBox(height: 4),
                  FutureBuilder<int>(
                    future: subtitleFuture,
                    builder: (context, snapshot) {
                      final count = snapshot.data ?? 0;
                      return Text(
                        count > 0 ? '$count $unit' : emptyText,
                        style: TextStyle(
                          fontSize: 13,
                          color: colors.onSurface.withValues(alpha: 0.4),
                        ),
                      );
                    },
                  ),
                ],
              ),
            ),
            Icon(
              Icons.chevron_right,
              color: colors.onSurface.withValues(alpha: 0.25),
            ),
          ],
        ),
      ),
    );
  }

  void _navigateToReviews(Book book) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => BookReviewsPage(book: book),
      ),
    );
  }

  void _navigateToExcerpts(Book book) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => BookExcerptsPage(book: book),
      ),
    );
  }

  void _navigateToCharacters(Book book) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => BookCharactersPage(book: book),
      ),
    ).then((_) => _loadCharacters());
  }

  Future<void> _openCharacterSheet(dynamic character) async {
    final needRefresh = await CharacterInfoSheet.show(
      context,
      entityType: 'book',
      entityId: widget.book.id,
      character: character,
    );
    if (needRefresh == true) _loadCharacters();
  }

  /// 获取关联 EPUB 的句读（高亮）数量
  Future<int> _getEpubHighlightCount(String bookId) async {
    final readerBook = await ReaderDao().getReaderBookByBookId(bookId);
    if (readerBook == null) return 0;
    final highlights = await ReaderDao().getHighlightsByBookId(readerBook['id'] as String);
    return highlights.where((h) => h['color'] != 'excerpt').length;
  }

  /// 跳转到 EPUB 句读管理页
  void _navigateToEpubHighlights(Book book) async {
    final readerBook = await ReaderDao().getReaderBookByBookId(book.id);
    if (!mounted) return;
    if (readerBook == null) {
      ToastUtil.show(context, '该书籍尚未关联EPUB数据，请关联后使用');
      return;
    }
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => EpubHighlightsPage(
          bookId: readerBook['id'] as String,
          book: readerBook,
        ),
      ),
    );
  }

  String _formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }

  void _navigateToEdit(BuildContext context) {
    final provider = context.read<AppProvider>();
    Navigator.pushNamed(context, '/book-form', arguments: widget.book).then((_) {
      provider.setEditRefresh(widget.book.id);
      provider.loadBooks();
    });
  }

  void _showDeleteDialog(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        backgroundColor: colors.surface,
        elevation: 0,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        title: Text(
          '确认删除',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.w600,
            color: colors.onSurface,
          ),
        ),
        content: Text(
          '确定要删除"${widget.book.title}"吗？删除后可在回收站恢复。',
          style: TextStyle(
            fontSize: 14,
            color: colors.onSurface.withValues(alpha: 0.6),
            height: 1.5,
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            style: TextButton.styleFrom(
              foregroundColor: colors.onSurface.withValues(alpha: 0.6),
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            ),
            child: const Text('取消'),
          ),
          ElevatedButton(
            onPressed: () async {
              await context.read<AppProvider>().removeBook(widget.book.id);
              if (!mounted || !context.mounted) return;
              Navigator.pop(context);
              if (widget.embedded) {
                context.read<AppProvider>().selectBook(null);
              } else {
                Navigator.pop(context);
              }
              if (mounted && context.mounted) {
                ToastUtil.show(context, '已删除');
              }
            },
            style: ElevatedButton.styleFrom(
              backgroundColor: colors.error,
              foregroundColor: colors.onError,
              elevation: 0,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(8),
              ),
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            ),
            child: const Text('删除'),
          ),
        ],
        actionsPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
    );
  }




  void _showSharePoster(Book book) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => BookSharePage(book: book),
      ),
    );
  }
}

class _RatingInputFormatter extends TextInputFormatter {
  @override
  TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
    final text = newValue.text;
    if (text.isEmpty) return newValue;
    if (!RegExp(r'^\d{0,2}\.?\d{0,1}$').hasMatch(text)) return oldValue;
    final n = double.tryParse(text);
    if (n != null && n > 10) return oldValue;
    return newValue;
  }
}