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

/// 笔记详情页 - 极简主义设计
class NoteDetailPage extends StatefulWidget {
  final Note note;

  const NoteDetailPage({super.key, required this.note});

  @override
  State<NoteDetailPage> createState() => _NoteDetailPageState();
}

class _NoteDetailPageState extends State<NoteDetailPage> {
  @override
  Widget build(BuildContext context) {
    // 从 Provider 获取最新的笔记数据
    final note = context.watch<AppProvider>().notes.firstWhere(
      (n) => n.id == widget.note.id,
      orElse: () => widget.note,
    );
    
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        title: Text(
          _getTitle(note.content),
          overflow: TextOverflow.ellipsis,
          maxLines: 1,
        ),
        actions: [
          // 格式指示器 - 纯文本标记
          if (note.contentType == 'markdown')
            Container(
              margin: const EdgeInsets.only(right: 8),
              padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
              decoration: BoxDecoration(
                color: const Color(0xFFF5F5F5),
                borderRadius: BorderRadius.circular(2),
              ),
              child: const Text(
                'MD',
                style: TextStyle(
                  fontSize: 10,
                  fontWeight: FontWeight.w500,
                  color: Color(0xFF666666),
                ),
              ),
            )
          else
            Container(
              margin: const EdgeInsets.only(right: 8),
              padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
              decoration: BoxDecoration(
                color: const Color(0xFFF5F5F5),
                borderRadius: BorderRadius.circular(2),
              ),
              child: const Text(
                'TXT',
                style: TextStyle(
                  fontSize: 10,
                  fontWeight: FontWeight.w500,
                  color: Color(0xFF666666),
                ),
              ),
            ),
          IconButton(
            icon: const Icon(Icons.edit_outlined),
            onPressed: () => _navigateToEdit(context),
          ),
          const SizedBox(width: 8),
        ],
      ),
      body: Column(
        children: [
          // 标签区域
          if (note.tags.isNotEmpty)
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
              decoration: const BoxDecoration(
                border: Border(
                  bottom: BorderSide(color: Color(0xFFE8E8E8), width: 0.5),
                ),
              ),
              child: Row(
                children: [
                  Wrap(
                    spacing: 10,
                    runSpacing: 10,
                    children: note.tags.map((tag) {
                      return Container(
                        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                        decoration: BoxDecoration(
                          color: const Color(0xFFFAFAFA),
                          borderRadius: BorderRadius.circular(8),
                          border: Border.all(color: const Color(0xFFE8E8E8), width: 0.5),
                        ),
                        child: Text(
                          tag,
                          style: const TextStyle(
                            fontSize: 13,
                            color: Color(0xFF666666),
                          ),
                        ),
                      );
                    }).toList(),
                  ),
                ],
              ),
            ),

          // 内容区域
          Expanded(
            child: note.contentType == 'markdown'
                ? _buildMarkdownContent(note)
                : _buildPlainTextContent(note),
          ),

          // 图片区域（仅在纯文本模式下显示）
          if (note.contentType == 'plain_text' && note.images.isNotEmpty)
            Container(
              padding: const EdgeInsets.fromLTRB(20, 20, 20, 24),
              decoration: const BoxDecoration(
                border: Border(
                  top: BorderSide(color: Color(0xFFE8E8E8), width: 0.5),
                ),
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // 图片标题
                  Row(
                    children: [
                      Container(
                        width: 32,
                        height: 32,
                        decoration: BoxDecoration(
                          color: const Color(0xFFFAFAFA),
                          borderRadius: BorderRadius.circular(8),
                          border: Border.all(color: const Color(0xFFE8E8E8), width: 0.5),
                        ),
                        child: const Icon(
                          Icons.image_outlined,
                          size: 18,
                          color: Color(0xFF666666),
                        ),
                      ),
                      const SizedBox(width: 12),
                      Text(
                        '图片 (${note.images.length})',
                        style: const TextStyle(
                          fontSize: 15,
                          fontWeight: FontWeight.w600,
                          color: Color(0xFF1A1A1A),
                        ),
                      ),
                    ],
                  ),
                  const SizedBox(height: 16),
                  // 图片列表
                  SizedBox(
                    height: 110,
                    child: ListView.builder(
                      scrollDirection: Axis.horizontal,
                      itemCount: note.images.length,
                      itemBuilder: (context, index) {
                        return GestureDetector(
                          onTap: () => _showImagePreview(context, note.images, index),
                          child: Container(
                            width: 110,
                            height: 110,
                            margin: const EdgeInsets.only(right: 12),
                            decoration: BoxDecoration(
                              borderRadius: BorderRadius.circular(10),
                              border: Border.all(color: const Color(0xFFE8E8E8), width: 0.5),
                            ),
                            clipBehavior: Clip.antiAlias,
                            child: Image.file(
                              File(note.images[index]),
                              fit: BoxFit.cover,
                            ),
                          ),
                        );
                      },
                    ),
                  ),
                ],
              ),
            ),

          // 底部操作栏
          Container(
            decoration: const BoxDecoration(
              border: Border(
                top: BorderSide(color: Color(0xFFE8E8E8), width: 0.5),
              ),
            ),
            child: SafeArea(
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
                child: Row(
                  children: [
                    // 时间信息
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          Text(
                            '创建 ${_formatDateTime(note.createdAt)}',
                            style: const TextStyle(
                              fontSize: 12,
                              color: Color(0xFF999999),
                            ),
                          ),
                          const SizedBox(height: 4),
                          Text(
                            '更新 ${_formatDateTime(note.updatedAt)}',
                            style: const TextStyle(
                              fontSize: 12,
                              color: Color(0xFF999999),
                            ),
                          ),
                        ],
                      ),
                    ),
                    // 操作按钮
                    Row(
                      children: [
                        _buildActionButton(
                          icon: Icons.edit_outlined,
                          color: const Color(0xFF666666),
                          onTap: () => _navigateToEdit(context),
                        ),
                        const SizedBox(width: 12),
                        _buildActionButton(
                          icon: Icons.delete_outline,
                          color: Colors.red,
                          onTap: () => _showDeleteDialog(context),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  /// 构建 Markdown 内容
  Widget _buildMarkdownContent(Note note) {
    return Markdown(
      data: note.content,
      styleSheet: MarkdownStyleSheet(
        h1: const TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.w600,
          color: Color(0xFF1A1A1A),
          height: 1.4,
        ),
        h2: const TextStyle(
          fontSize: 20,
          fontWeight: FontWeight.w600,
          color: Color(0xFF1A1A1A),
          height: 1.4,
        ),
        h3: const TextStyle(
          fontSize: 18,
          fontWeight: FontWeight.w600,
          color: Color(0xFF1A1A1A),
          height: 1.4,
        ),
        p: const TextStyle(
          fontSize: 16,
          color: Color(0xFF1A1A1A),
          height: 1.8,
        ),
        code: const TextStyle(
          fontSize: 14,
          color: Color(0xFF1A1A1A),
          backgroundColor: Color(0xFFF5F5F5),
        ),
        codeblockDecoration: BoxDecoration(
          color: const Color(0xFFF5F5F5),
          border: Border.all(color: const Color(0xFFE5E5E5)),
        ),
        blockquote: const TextStyle(
          fontSize: 16,
          color: Color(0xFF666666),
          fontStyle: FontStyle.italic,
        ),
        blockquoteDecoration: BoxDecoration(
          border: Border(
            left: BorderSide(color: const Color(0xFF999999), width: 4),
          ),
        ),
        listBullet: const TextStyle(
          fontSize: 16,
          color: Color(0xFF1A1A1A),
        ),
        a: const TextStyle(
          fontSize: 16,
          color: Color(0xFF1A1A1A),
          decoration: TextDecoration.underline,
        ),
      ),
      padding: const EdgeInsets.all(16),
    );
  }

  /// 构建纯文本内容
  Widget _buildPlainTextContent(Note note) {
    return SingleChildScrollView(
      padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
      child: SizedBox(
        width: double.infinity,
        child: SelectableText(
          note.content,
          textAlign: TextAlign.left,
          style: const TextStyle(
            fontSize: 15,
            color: Color(0xFF1A1A1A),
            height: 1.9,
            letterSpacing: 0.2,
          ),
        ),
      ),
    );
  }

  /// 格式化日期时间
  String _formatDateTime(DateTime dateTime) {
    return '${dateTime.year}-${dateTime.month.toString().padLeft(2, '0')}-${dateTime.day.toString().padLeft(2, '0')} ${dateTime.hour.toString().padLeft(2, '0')}:${dateTime.minute.toString().padLeft(2, '0')}';
  }

  /// 获取标题（内容第一行，去除换行）
  String _getTitle(String content) {
    if (content.isEmpty) return '无标题';
    // 移除换行符和多余空格
    final trimmed = content.replaceAll('\n', ' ').trim();
    if (trimmed.isEmpty) return '无标题';
    return trimmed;
  }

  /// 跳转到编辑页面
  void _navigateToEdit(BuildContext context) {
    // 从 Provider 获取最新的笔记数据，确保图片等字段是最新的
    final currentNote = context.read<AppProvider>().notes.firstWhere(
      (n) => n.id == widget.note.id,
      orElse: () => widget.note,
    );
    Navigator.pushNamed(context, '/note-form', arguments: currentNote).then((_) async {
      // 返回时刷新笔记列表
      await context.read<AppProvider>().loadNotes();
    });
  }

  /// 显示图片预览
  void _showImagePreview(BuildContext context, List<String> images, int initialIndex) {
    showDialog(
      context: context,
      barrierDismissible: true,
      builder: (context) => GestureDetector(
        onTap: () => Navigator.pop(context),
        child: Container(
          color: Colors.black.withOpacity(0.9),
          child: Center(
            child: InteractiveViewer(
              panEnabled: true,
              boundaryMargin: const EdgeInsets.all(20),
              minScale: 0.5,
              maxScale: 4,
              child: Image.file(
                File(images[initialIndex]),
                fit: BoxFit.contain,
              ),
            ),
          ),
        ),
      ),
    );
  }

  /// 构建操作按钮
  Widget _buildActionButton({
    required IconData icon,
    required Color color,
    required VoidCallback onTap,
  }) {
    return Container(
      width: 40,
      height: 40,
      decoration: BoxDecoration(
        color: const Color(0xFFFAFAFA),
        borderRadius: BorderRadius.circular(10),
        border: Border.all(color: const Color(0xFFE8E8E8), width: 0.5),
      ),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(10),
          child: Icon(
            icon,
            color: color,
            size: 20,
          ),
        ),
      ),
    );
  }

  /// 显示删除对话框
  void _showDeleteDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        backgroundColor: Colors.white,
        elevation: 0,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        title: const Text(
          '确认删除',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.w600,
          ),
        ),
        content: const Text(
          '确定要删除这条笔记吗？删除后可在回收站恢复。',
          style: TextStyle(
            fontSize: 14,
            color: Color(0xFF666666),
            height: 1.5,
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            style: TextButton.styleFrom(
              foregroundColor: const Color(0xFF666666),
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            ),
            child: const Text('取消'),
          ),
          ElevatedButton(
            onPressed: () async {
              await context.read<AppProvider>().removeNote(widget.note.id);
              // 刷新笔记列表
              await context.read<AppProvider>().loadNotes();
              if (!mounted) return;
              Navigator.pop(context);
              Navigator.pop(context);
              ToastUtil.show(context, '已删除');
            },
            style: ElevatedButton.styleFrom(
              backgroundColor: Colors.red,
              foregroundColor: Colors.white,
              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),
      ),
    );
  }
}