import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/app_provider.dart';
import '../models/data_models.dart';
import '../utils/app_theme.dart';

/// 书籍详情页
class BookDetailPage extends StatefulWidget {
  final Book book;

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

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

class _BookDetailPageState extends State<BookDetailPage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.book.title),
        actions: [
          IconButton(
            icon: const Icon(Icons.edit),
            onPressed: () => _navigateToEdit(context),
          ),
          IconButton(
            icon: const Icon(Icons.delete_outline),
            onPressed: () => _showDeleteDialog(context),
          ),
        ],
      ),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 封面区域
            _buildCoverSection(context),

            // 基本信息
            _buildInfoSection(context),

            // 笔记区域
            if (widget.book.note != null && widget.book.note!.isNotEmpty)
              _buildNoteSection(context),
          ],
        ),
      ),
    );
  }

  /// 构建封面区域
  Widget _buildCoverSection(BuildContext context) {
    return Container(
      width: double.infinity,
      height: 250,
      decoration: BoxDecoration(
        gradient: LinearGradient(
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
          colors: [
            Theme.of(context).colorScheme.primaryContainer,
            Theme.of(context).colorScheme.surface,
          ],
        ),
      ),
      child: Stack(
        children: [
          Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(
                  Icons.menu_book,
                  size: 80,
                  color: Theme.of(context).colorScheme.primary.withOpacity(0.6),
                ),
                const SizedBox(height: 16),
                Text(
                  widget.book.title,
                  style: Theme.of(context).textTheme.headlineSmall?.copyWith(
                        fontWeight: FontWeight.bold,
                        color: Theme.of(context).colorScheme.onSurface,
                      ),
                  textAlign: TextAlign.center,
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                ),
              ],
            ),
          ),
          Positioned(
            top: 16,
            right: 16,
            child: _buildStatusTag(context),
          ),
        ],
      ),
    );
  }

  /// 构建状态标签
  Widget _buildStatusTag(BuildContext context) {
    Color statusColor;
    String statusText;

    switch (widget.book.status) {
      case 'read':
        statusColor = AppTheme.readColor;
        statusText = '读完';
        break;
      case 'reading':
        statusColor = AppTheme.readingColor;
        statusText = '在读';
        break;
      case 'want_to_read':
        statusColor = AppTheme.wantToReadColor;
        statusText = '准备读';
        break;
      default:
        statusColor = Colors.grey;
        statusText = '未知';
    }

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
      decoration: BoxDecoration(
        color: statusColor.withOpacity(0.9),
        borderRadius: BorderRadius.circular(20),
      ),
      child: Text(
        statusText,
        style: const TextStyle(
          fontSize: 14,
          color: Colors.white,
          fontWeight: FontWeight.bold,
        ),
      ),
    );
  }

  /// 构建信息区域
  Widget _buildInfoSection(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // 作者
          if (widget.book.author != null && widget.book.author!.isNotEmpty) ...[
            _buildInfoItem(
              context,
              icon: Icons.person,
              label: widget.book.author!,
            ),
            const SizedBox(height: 12),
          ],

          // 评分
          if (widget.book.rating != null) ...[
            _buildInfoItem(
              context,
              icon: Icons.star,
              label: widget.book.rating.toString(),
              iconColor: Colors.amber[700],
              textColor: Colors.amber[700],
            ),
            const SizedBox(height: 12),
          ],

          // 阅读日期
          if (widget.book.readDate != null)
            _buildInfoItem(
              context,
              icon: Icons.event,
              label: '阅读日期：${_formatDate(widget.book.readDate!)}',
            ),
        ],
      ),
    );
  }

  /// 构建信息项
  Widget _buildInfoItem(
    BuildContext context, {
    required IconData icon,
    required String label,
    Color? iconColor,
    Color? textColor,
  }) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        Icon(icon, size: 18, color: iconColor),
        const SizedBox(width: 4),
        Text(
          label,
          style: TextStyle(
            fontSize: 14,
            color: textColor ?? Theme.of(context).colorScheme.onSurfaceVariant,
          ),
        ),
      ],
    );
  }

  /// 构建笔记区域
  Widget _buildNoteSection(BuildContext context) {
    return Container(
      margin: const EdgeInsets.all(16),
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Theme.of(context).colorScheme.surfaceContainerHighest,
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(
                Icons.edit_note,
                size: 20,
                color: Theme.of(context).colorScheme.primary,
              ),
              const SizedBox(width: 8),
              Text(
                '笔记',
                style: Theme.of(context).textTheme.titleMedium?.copyWith(
                      fontWeight: FontWeight.bold,
                    ),
              ),
            ],
          ),
          const SizedBox(height: 12),
          Text(
            widget.book.note!,
            style: Theme.of(context).textTheme.bodyMedium,
          ),
        ],
      ),
    );
  }

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

  /// 跳转到编辑页面
  void _navigateToEdit(BuildContext context) {
    Navigator.pushNamed(context, '/book-form', arguments: widget.book).then((_) {
      context.read<AppProvider>().loadBooks();
    });
  }

  /// 显示删除对话框
  void _showDeleteDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('确认删除'),
        content: Text('确定要删除"${widget.book.title}"吗？此操作不可恢复。'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('取消'),
          ),
          TextButton(
            onPressed: () async {
              await context.read<AppProvider>().removeBook(widget.book.id);
              if (!mounted) return;
              Navigator.pop(context);
              Navigator.pop(context);
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(
                  content: Text('已删除'),
                  behavior: SnackBarBehavior.floating,
                ),
              );
            },
            child: const Text(
              '删除',
              style: TextStyle(color: Colors.red),
            ),
          ),
        ],
      ),
    );
  }
}