import 'dart:io';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../providers/app_provider.dart';
import '../../utils/user_prefs.dart';
import '../../widgets/book_status_bar.dart';
import '../../widgets/book_list_item.dart';
import '../../widgets/animated_star_rating.dart';
import '../../widgets/shimmer_skeleton.dart';

/// 阅读标签页
class BookTabPage extends StatefulWidget {
  const BookTabPage({super.key});

  @override
  State<BookTabPage> createState() => _BookTabPageState();
}

class _BookTabPageState extends State<BookTabPage> {
  int _layoutStyle = 0;
  bool _firstLoad = true;

  @override
  void initState() {
    super.initState();
    _layoutStyle = UserPrefs().bookLayoutStyle;
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (mounted) setState(() => _firstLoad = false);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        const BookStatusBar(),
        Expanded(
          child: _buildBookList(context),
        ),
      ],
    );
  }

  Widget _buildBookList(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    return Consumer<AppProvider>(
      builder: (context, provider, child) {
        final statusMap = {0: 'read', 1: 'reading', 2: 'want_to_read'};
        final currentStatus = statusMap[provider.bookStatusIndex]!;
        final books = provider.getBooksByStatus(currentStatus);

        if (_firstLoad) {
          return _buildSkeleton();
        }

        if (books.isEmpty) {
          return RefreshIndicator(
            onRefresh: () async => await provider.loadBooks(),
            color: colors.primary,
            backgroundColor: colors.surface,
            child: ListView(
              physics: const AlwaysScrollableScrollPhysics(),
              children: [_buildEmptyState(context, provider.bookStatusIndex)],
            ),
          );
        }

        if (_layoutStyle == 1) {
          return _buildListView(books, provider);
        }
        return _buildGridView(books, provider);
      },
    );
  }

  Widget _buildGridView(List books, AppProvider provider) {
    final colors = Theme.of(context).colorScheme;
    return RefreshIndicator(
      onRefresh: () async => await provider.loadBooks(),
      color: colors.primary,
      backgroundColor: colors.surface,
      child: GridView.builder(
        padding: const EdgeInsets.fromLTRB(16, 16, 16, 100),
        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 3,
          childAspectRatio: 0.55,
          crossAxisSpacing: 12,
          mainAxisSpacing: 16,
        ),
        itemCount: books.length,
        itemBuilder: (context, index) => BookListItem(book: books[index]),
      ),
    );
  }

  Widget _buildListView(List books, AppProvider provider) {
    final colors = Theme.of(context).colorScheme;
    return RefreshIndicator(
      onRefresh: () async => await provider.loadBooks(),
      color: colors.primary,
      backgroundColor: colors.surface,
      child: ListView.builder(
        padding: const EdgeInsets.fromLTRB(12, 8, 12, 100),
        itemCount: books.length,
        itemBuilder: (context, index) => _buildListCard(books[index]),
      ),
    );
  }

  Widget _buildListCard(book) {
    final colors = Theme.of(context).colorScheme;
    return GestureDetector(
      onTap: () => Navigator.pushNamed(context, '/book-detail', arguments: book),
      onLongPress: () => _showDeleteDialog(context, book),
      child: Container(
        margin: const EdgeInsets.only(bottom: 8),
        padding: const EdgeInsets.all(12),
        decoration: BoxDecoration(
          color: colors.surfaceContainerHigh,
          borderRadius: BorderRadius.circular(12),
        ),
        child: Row(
          children: [
            Container(
              width: 48, height: 64,
              decoration: BoxDecoration(
                color: colors.outlineVariant,
                borderRadius: BorderRadius.circular(6),
              ),
              clipBehavior: Clip.antiAlias,
              child: book.coverPath != null && book.coverPath!.isNotEmpty
                  ? Image.file(File(book.coverPath!), fit: BoxFit.cover,
                      errorBuilder: (_, __, ___) => Icon(Icons.menu_book_outlined, size: 22, color: colors.onSurface.withValues(alpha: 0.25)))
                  : Icon(Icons.menu_book_outlined, size: 22, color: colors.onSurface.withValues(alpha: 0.25)),
            ),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(book.title, maxLines: 1, overflow: TextOverflow.ellipsis,
                      style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: colors.onSurface)),
                  if (book.authors.isNotEmpty) ...[
                    const SizedBox(height: 3),
                    Text(book.authors.take(2).join('、'), maxLines: 1, overflow: TextOverflow.ellipsis,
                        style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.35))),
                  ],
                  const SizedBox(height: 6),
                  if (book.rating != null)
                    AnimatedStarRating(rating: book.rating!, starSize: 12, showNumber: true)
                  else
                    const SizedBox(height: 14),
                ],
              ),
            ),
            const SizedBox(width: 8),
            Icon(Icons.chevron_right, color: colors.onSurface.withValues(alpha: 0.2), size: 20),
          ],
        ),
      ),
    );
  }

  void _showDeleteDialog(BuildContext context, book) {
    final colors = Theme.of(context).colorScheme;
    showDialog(
      context: context,
      builder: (ctx) => 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《${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(ctx),
            child: Text('取消', style: TextStyle(color: colors.onSurface.withValues(alpha: 0.6))),
          ),
          ElevatedButton(
            onPressed: () async {
              await context.read<AppProvider>().removeBook(book.id);
              Navigator.pop(ctx);
            },
            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),
      ),
    );
  }

  Widget _buildSkeleton() {
    return _layoutStyle == 1
        ? MovieSkeletonGrid()
        : const BookSkeletonGrid();
  }

  Widget _buildEmptyState(BuildContext context, int statusIndex) {
    final colors = Theme.of(context).colorScheme;
    final statusText = ['已读', '在读', '想读'][statusIndex];
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Container(
            width: 80, height: 80,
            decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(20)),
            child: Icon(Icons.menu_book_outlined, size: 40, color: colors.onSurface.withValues(alpha: 0.25)),
          ),
          const SizedBox(height: 20),
          Text('暂无$statusText的书籍', style: TextStyle(fontSize: 16, color: colors.onSurface.withValues(alpha: 0.4))),
          const SizedBox(height: 24),
          InkWell(
            onTap: () {
              final statusMap = {0: 'read', 1: 'reading', 2: 'want_to_read'};
              Navigator.pushNamed(context, '/book-form', arguments: {'initialStatus': statusMap[statusIndex]!});
            },
            child: Container(
              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
              decoration: BoxDecoration(color: colors.primary, borderRadius: BorderRadius.circular(8)),
              child: Text('添加记录', style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500, color: colors.onPrimary)),
            ),
          ),
        ],
      ),
    );
  }
}