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)),
        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: 16, vertical: 12),
              decoration: const BoxDecoration(
                border: Border(
                  bottom: BorderSide(color: Color(0xFFE5E5E5), width: 0.5),
                ),
              ),
              child: Row(
                children: [
                  Wrap(
                    spacing: 8,
                    runSpacing: 8,
                    children: note.tags.map((tag) {
                      return Container(
                        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
                        decoration: BoxDecoration(
                          color: const Color(0xFFF5F5F5),
                          border: Border.all(color: const Color(0xFFE5E5E5)),
                        ),
                        child: Text(
                          tag,
                          style: const TextStyle(
                            fontSize: 12,
                            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(
              height: 120,
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
              decoration: const BoxDecoration(
                border: Border(
                  top: BorderSide(color: Color(0xFFE5E5E5), width: 0.5),
                ),
              ),
              child: ListView.builder(
                scrollDirection: Axis.horizontal,
                itemCount: note.images.length,
                itemBuilder: (context, index) {
                  return Container(
                    width: 100,
                    height: 100,
                    margin: const EdgeInsets.only(right: 12),
                    decoration: BoxDecoration(
                      border: Border.all(color: const Color(0xFFE5E5E5)),
                    ),
                    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(0xFFE5E5E5), width: 0.5),
              ),
            ),
            child: SafeArea(
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    // 创建时间和更新时间
                    Row(
                      children: [
                        Expanded(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text(
                                '创建时间：${_formatDateTime(note.createdAt)}',
                                style: const TextStyle(
                                  fontSize: 11,
                                  color: Color(0xFF999999),
                                ),
                              ),
                              const SizedBox(height: 4),
                              Text(
                                '更新时间：${_formatDateTime(note.updatedAt)}',
                                style: const TextStyle(
                                  fontSize: 11,
                                  color: Color(0xFF999999),
                                ),
                              ),
                            ],
                          ),
                        ),
                        Row(
                          children: [
                            IconButton(
                              icon: const Icon(Icons.edit_outlined, size: 20),
                              color: const Color(0xFF666666),
                              onPressed: () => _navigateToEdit(context),
                              padding: EdgeInsets.zero,
                              constraints: const BoxConstraints(),
                            ),
                            const SizedBox(width: 16),
                            IconButton(
                              icon: const Icon(Icons.delete_outline, size: 20),
                              color: Colors.red,
                              onPressed: () => _showDeleteDialog(context),
                              padding: EdgeInsets.zero,
                              constraints: const BoxConstraints(),
                            ),
                          ],
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  /// 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.all(16),
      child: SizedBox(
        width: double.infinity,
        child: Text(
          note.content,
          textAlign: TextAlign.left,
          style: const TextStyle(
            fontSize: 16,
            color: Color(0xFF1A1A1A),
            height: 1.8,
          ),
        ),
      ),
    );
  }

  /// 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（内容前5个字）
  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';
    // 取前5个字
    if (trimmed.length <= 5) return trimmed;
    return '${trimmed.substring(0, 5)}...';
  }

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

  /// 显示删除对话框
  void _showDeleteDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        backgroundColor: Colors.white,
        elevation: 0,
        shape: const RoundedRectangleBorder(borderRadius: BorderRadius.zero),
        title: const Text('确认删除'),
        content: const Text('确定要删除这条笔记吗？'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('取消', style: TextStyle(color: Color(0xFF666666))),
          ),
          TextButton(
            onPressed: () async {
              await context.read<AppProvider>().removeNote(widget.note.id);
              if (!mounted) return;
              Navigator.pop(context);
              Navigator.pop(context);
              ToastUtil.show(context, '已删除');
            },
            child: const Text('删除', style: TextStyle(color: Colors.red)),
          ),
        ],
      ),
    );
  }
}