import 'dart:io' as io;
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../../../constants/app_constants.dart';
import '../../../utils/http/http_client.dart';
import 'tougao.dart';

/// 时间: 2026-03-30
/// 功能: 诗词投稿页面
/// 介绍: 用户提交诗词收录申请，支持相似度检测和投稿记录
/// 最新变化: 新增投稿记录功能

class ManuscriptPage extends StatefulWidget {
  const ManuscriptPage({super.key});

  @override
  State<ManuscriptPage> createState() => _ManuscriptPageState();
}

class _ManuscriptPageState extends State<ManuscriptPage> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _urlController = TextEditingController();
  final _keywordsController = TextEditingController();
  final _introduceController = TextEditingController();

  List<Map<String, dynamic>> _categories = [];
  String? _selectedCategory;
  bool _isLoadingCategories = true;
  bool _isCheckingName = false;
  bool _isSubmitting = false;

  bool _nameExists = false;
  int _maxSimilarity = 0;
  int _similarCount = 0;
  bool _nameChecked = false;

  @override
  void initState() {
    super.initState();
    _loadCategories();
  }

  @override
  void dispose() {
    _nameController.dispose();
    _urlController.dispose();
    _keywordsController.dispose();
    _introduceController.dispose();
    super.dispose();
  }

  String _getPlatform() {
    try {
      final String osName = io.Platform.operatingSystem;
      if (osName == 'ohos' ||
          osName == 'harmonyos' ||
          osName == 'openharmony') {
        return 'HarmonyOS Flutter';
      } else if (io.Platform.isAndroid) {
        return 'Android Flutter';
      } else if (io.Platform.isIOS) {
        return 'iOS Flutter';
      } else if (io.Platform.isWindows) {
        return 'Windows Flutter';
      } else if (io.Platform.isMacOS) {
        return 'macOS Flutter';
      } else if (io.Platform.isLinux) {
        return 'Linux Flutter';
      } else {
        return 'Flutter';
      }
    } catch (e) {
      return 'Flutter';
    }
  }

  Future<void> _loadCategories() async {
    try {
      final response = await HttpClient.get(
        'app/apply.php',
        queryParameters: {'api': 'categories'},
      );

      if (response.isSuccess) {
        final data = response.jsonData;
        if (data['ok'] == true && data['categories'] != null) {
          setState(() {
            _categories = List<Map<String, dynamic>>.from(data['categories']);
            _isLoadingCategories = false;
          });
        } else {
          setState(() => _isLoadingCategories = false);
          _showSnackBar('加载分类失败', isError: true);
        }
      } else {
        setState(() => _isLoadingCategories = false);
        _showSnackBar('加载分类失败', isError: true);
      }
    } catch (e) {
      setState(() => _isLoadingCategories = false);
      _showSnackBar('网络请求失败: $e', isError: true);
    }
  }

  Future<void> _checkName() async {
    final name = _nameController.text.trim();
    if (name.isEmpty) {
      setState(() {
        _nameChecked = false;
        _nameExists = false;
      });
      return;
    }

    setState(() => _isCheckingName = true);

    try {
      final response = await HttpClient.postForm(
        'app/apply.php?api=check-name',
        data: {'name': name, 'threshold': '80'},
      );

      if (response.isSuccess) {
        final data = response.jsonData;
        if (data['ok'] == true) {
          setState(() {
            _nameChecked = true;
            _nameExists = data['exists'] ?? false;
            _maxSimilarity = (data['max_similarity'] ?? 0).toInt();
            _similarCount = (data['similar_count'] ?? 0).toInt();
          });
        }
      }
    } catch (e) {
      _showSnackBar('检测失败，请重试', isError: true);
    } finally {
      setState(() => _isCheckingName = false);
    }
  }

  Future<void> _saveManuscriptRecord() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      final record = ManuscriptRecord(
        name: _nameController.text.trim(),
        catename: _selectedCategory ?? '',
        url: _urlController.text.trim(),
        keywords: _keywordsController.text.trim(),
        introduce: _introduceController.text.trim(),
        platform: _getPlatform(),
        submitTime: DateTime.now(),
      );

      final recordsJson = prefs.getStringList('manuscript_records') ?? [];
      recordsJson.insert(0, jsonEncode(record.toJson()));

      await prefs.setStringList(
        'manuscript_records',
        recordsJson.take(50).toList(),
      );
    } catch (e) {}
  }

  Future<void> _submitForm() async {
    if (!_formKey.currentState!.validate()) return;

    if (!_nameChecked) {
      await _checkName();
      if (!_nameChecked) return;
    }

    if (_nameExists) {
      _showSnackBar('该诗词已存在，请更换', isError: true);
      return;
    }

    final confirm = await _showConfirmDialog();
    if (!confirm) return;

    setState(() => _isSubmitting = true);

    try {
      final response = await HttpClient.postForm(
        'app/apply.php?api=submit',
        data: {
          'name': _nameController.text.trim(),
          'catename': _selectedCategory,
          'url': _urlController.text.trim(),
          'keywords': _keywordsController.text.trim(),
          'introduce': _introduceController.text.trim(),
          'img': _getPlatform(),
          'threshold': '80',
        },
      );

      if (response.isSuccess) {
        final data = response.jsonData;
        if (data['ok'] == true) {
          await _saveManuscriptRecord();
          _showResultDialog(true, data['message'] ?? '✅ 提交成功！等待审核');
          _resetForm();
        } else {
          _showResultDialog(false, data['error'] ?? '提交失败');
        }
      } else {
        _showResultDialog(false, response.message);
      }
    } catch (e) {
      _showResultDialog(false, '网络请求失败: $e');
    } finally {
      setState(() => _isSubmitting = false);
    }
  }

  void _resetForm() {
    _formKey.currentState?.reset();
    _nameController.clear();
    _urlController.clear();
    _keywordsController.clear();
    _introduceController.clear();
    setState(() {
      _selectedCategory = null;
      _nameChecked = false;
      _nameExists = false;
      _maxSimilarity = 0;
      _similarCount = 0;
    });
  }

  Future<bool> _showConfirmDialog() async {
    return await showDialog<bool>(
          context: context,
          builder: (context) => AlertDialog(
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(16),
            ),
            title: const Row(
              children: [
                Icon(Icons.help_outline, color: AppConstants.primaryColor),
                SizedBox(width: 8),
                Text('确认提交'),
              ],
            ),
            content: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _buildConfirmItem('投稿句子', _nameController.text),
                _buildConfirmItem('分类', _selectedCategory ?? ''),
                _buildConfirmItem('诗人和标题', _urlController.text),
                _buildConfirmItem('关键词', _keywordsController.text),
                _buildConfirmItem('平台', _getPlatform()),
                _buildConfirmItem('介绍', _introduceController.text, maxLines: 2),
              ],
            ),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(context, false),
                child: const Text('取消'),
              ),
              ElevatedButton(
                onPressed: () => Navigator.pop(context, true),
                style: ElevatedButton.styleFrom(
                  backgroundColor: AppConstants.primaryColor,
                  foregroundColor: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8),
                  ),
                ),
                child: const Text('确认提交'),
              ),
            ],
          ),
        ) ??
        false;
  }

  Widget _buildConfirmItem(String label, String value, {int maxLines = 1}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 80,
            child: Text(
              '$label：',
              style: TextStyle(color: Colors.grey[600], fontSize: 14),
            ),
          ),
          Expanded(
            child: Text(
              value,
              style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
              maxLines: maxLines,
              overflow: TextOverflow.ellipsis,
            ),
          ),
        ],
      ),
    );
  }

  void _showResultDialog(bool success, String message) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        title: Row(
          children: [
            Icon(
              success ? Icons.check_circle : Icons.error,
              color: success
                  ? AppConstants.successColor
                  : AppConstants.errorColor,
            ),
            const SizedBox(width: 8),
            Text(success ? '提交成功' : '提交失败'),
          ],
        ),
        content: Text(message),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('确定'),
          ),
        ],
      ),
    );
  }

  void _showSnackBar(String message, {bool isError = false}) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Row(
          children: [
            Icon(
              isError ? Icons.error_outline : Icons.check_circle_outline,
              color: Colors.white,
            ),
            const SizedBox(width: 8),
            Expanded(child: Text(message)),
          ],
        ),
        backgroundColor: isError
            ? AppConstants.errorColor
            : AppConstants.successColor,
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
        margin: const EdgeInsets.all(16),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFF5F5F5),
      appBar: AppBar(
        title: const Text(
          '📝 诗词投稿',
          style: TextStyle(
            color: AppConstants.primaryColor,
            fontWeight: FontWeight.bold,
          ),
        ),
        backgroundColor: Colors.white,
        elevation: 0,
        centerTitle: true,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: AppConstants.primaryColor),
          onPressed: () => Navigator.of(context).pop(),
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.history, color: AppConstants.primaryColor),
            tooltip: '投稿记录',
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(builder: (context) => const TougaoPage()),
              );
            },
          ),
        ],
      ),
      body: Form(
        key: _formKey,
        child: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            _buildHeaderCard(),
            const SizedBox(height: 16),
            _buildFormCard(),
            const SizedBox(height: 24),
            _buildSubmitButton(),
            const SizedBox(height: 16),
            _buildTipsCard(),
          ],
        ),
      ),
    );
  }

  Widget _buildHeaderCard() {
    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        gradient: LinearGradient(
          colors: [
            AppConstants.primaryColor.withAlpha(30),
            AppConstants.primaryColor.withAlpha(10),
          ],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        borderRadius: BorderRadius.circular(16),
      ),
      child: Row(
        children: [
          Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius: BorderRadius.circular(12),
            ),
            child: const Icon(
              Icons.edit_note,
              color: AppConstants.primaryColor,
              size: 32,
            ),
          ),
          const SizedBox(width: 16),
          const Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  '收录经典诗词',
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                ),
                SizedBox(height: 4),
                Text(
                  '支持原创和古诗，传承中华文化',
                  style: TextStyle(fontSize: 14, color: Colors.grey),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildFormCard() {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withAlpha(10),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        children: [
          _buildSectionHeader('📝 投稿信息'),
          const Divider(height: 1),
          Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              children: [
                _buildNameField(),
                const SizedBox(height: 16),
                _buildCategoryField(),
                const SizedBox(height: 16),
                _buildUrlField(),
                const SizedBox(height: 16),
                _buildKeywordsField(),
                const SizedBox(height: 16),
                _buildIntroduceField(),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildSectionHeader(String title) {
    return Padding(
      padding: const EdgeInsets.all(16),
      child: Row(
        children: [
          Text(
            title,
            style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
          ),
        ],
      ),
    );
  }

  Widget _buildNameField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            const Text(
              '参考语句',
              style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
            ),
            const Text(' *', style: TextStyle(color: AppConstants.errorColor)),
            const Spacer(),
            if (_isCheckingName)
              const SizedBox(
                width: 16,
                height: 16,
                child: CircularProgressIndicator(strokeWidth: 2),
              ),
          ],
        ),
        const SizedBox(height: 8),
        TextFormField(
          controller: _nameController,
          decoration: InputDecoration(
            hintText: '如：纤云弄巧，飞星传恨',
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
            contentPadding: const EdgeInsets.symmetric(
              horizontal: 16,
              vertical: 12,
            ),
            suffixIcon: _nameChecked
                ? Icon(
                    _nameExists ? Icons.error : Icons.check_circle,
                    color: _nameExists
                        ? AppConstants.errorColor
                        : AppConstants.successColor,
                  )
                : null,
          ),
          validator: (value) {
            if (value == null || value.trim().isEmpty) {
              return '请输入参考语句';
            }
            return null;
          },
          onChanged: (value) {
            setState(() {
              _nameChecked = false;
              _nameExists = false;
            });
          },
          onFieldSubmitted: (_) => _checkName(),
        ),
        if (_nameChecked) _buildSimilarityInfo(),
        const SizedBox(height: 8),
        Align(
          alignment: Alignment.centerRight,
          child: TextButton.icon(
            onPressed: _isCheckingName ? null : _checkName,
            icon: const Icon(Icons.search, size: 18),
            label: const Text('检测是否存在'),
          ),
        ),
      ],
    );
  }

  Widget _buildSimilarityInfo() {
    return Container(
      margin: const EdgeInsets.only(top: 8),
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: _nameExists
            ? AppConstants.errorColor.withAlpha(20)
            : AppConstants.successColor.withAlpha(20),
        borderRadius: BorderRadius.circular(8),
      ),
      child: Row(
        children: [
          Icon(
            _nameExists ? Icons.warning : Icons.check_circle,
            color: _nameExists
                ? AppConstants.errorColor
                : AppConstants.successColor,
            size: 20,
          ),
          const SizedBox(width: 8),
          Expanded(
            child: Text(
              _nameExists
                  ? '⚠️ 发现相似内容，相似 $_similarCount 条，最高相似度 $_maxSimilarity%'
                  : '✅ 未发现相似内容',
              style: TextStyle(
                color: _nameExists
                    ? AppConstants.errorColor
                    : AppConstants.successColor,
                fontSize: 13,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildCategoryField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Row(
          children: [
            Text(
              '分类',
              style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
            ),
            Text(' *', style: TextStyle(color: AppConstants.errorColor)),
          ],
        ),
        const SizedBox(height: 8),
        DropdownButtonFormField<String>(
          value: _selectedCategory,
          decoration: InputDecoration(
            hintText: '请选择分类',
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
            contentPadding: const EdgeInsets.symmetric(
              horizontal: 16,
              vertical: 12,
            ),
          ),
          items: _categories.map((cat) {
            return DropdownMenuItem(
              value: cat['catename'] as String,
              child: Text(cat['catename'] as String),
            );
          }).toList(),
          onChanged: (value) {
            setState(() => _selectedCategory = value);
          },
          validator: (value) {
            if (value == null || value.isEmpty) {
              return '请选择分类';
            }
            return null;
          },
        ),
      ],
    );
  }

  Widget _buildUrlField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Row(
          children: [
            Text(
              '诗人和标题',
              style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
            ),
            Text(' *', style: TextStyle(color: AppConstants.errorColor)),
          ],
        ),
        const SizedBox(height: 8),
        TextFormField(
          controller: _urlController,
          decoration: InputDecoration(
            hintText: '如：李白 静夜思',
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
            contentPadding: const EdgeInsets.symmetric(
              horizontal: 16,
              vertical: 12,
            ),
          ),
          validator: (value) {
            if (value == null || value.trim().isEmpty) {
              return '请输入诗人和标题';
            }
            return null;
          },
        ),
      ],
    );
  }

  Widget _buildKeywordsField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Row(
          children: [
            Text(
              '关键词',
              style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
            ),
            Text(' *', style: TextStyle(color: AppConstants.errorColor)),
          ],
        ),
        const SizedBox(height: 8),
        TextFormField(
          controller: _keywordsController,
          decoration: InputDecoration(
            hintText: '用逗号分隔，如：思乡,月亮,唐诗',
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
            contentPadding: const EdgeInsets.symmetric(
              horizontal: 16,
              vertical: 12,
            ),
          ),
          validator: (value) {
            if (value == null || value.trim().isEmpty) {
              return '请输入关键词';
            }
            return null;
          },
        ),
      ],
    );
  }

  Widget _buildIntroduceField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Row(
          children: [
            Text(
              '诗词介绍',
              style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
            ),
            Text(' *', style: TextStyle(color: AppConstants.errorColor)),
          ],
        ),
        const SizedBox(height: 8),
        TextFormField(
          controller: _introduceController,
          maxLines: 5,
          decoration: InputDecoration(
            hintText: '会说就多说几句...',
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
            contentPadding: const EdgeInsets.all(16),
          ),
          validator: (value) {
            if (value == null || value.trim().isEmpty) {
              return '请输入诗词介绍';
            }
            return null;
          },
        ),
      ],
    );
  }

  Widget _buildSubmitButton() {
    return Container(
      height: 56,
      decoration: BoxDecoration(
        gradient: LinearGradient(
          colors: [
            AppConstants.primaryColor,
            AppConstants.primaryColor.withAlpha(200),
          ],
        ),
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: AppConstants.primaryColor.withAlpha(50),
            blurRadius: 10,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: ElevatedButton(
        onPressed: _isSubmitting ? null : _submitForm,
        style: ElevatedButton.styleFrom(
          backgroundColor: Colors.transparent,
          shadowColor: Colors.transparent,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
          ),
        ),
        child: _isSubmitting
            ? const SizedBox(
                width: 24,
                height: 24,
                child: CircularProgressIndicator(
                  color: Colors.white,
                  strokeWidth: 2,
                ),
              )
            : const Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Icon(Icons.send, color: Colors.white),
                  SizedBox(width: 8),
                  Text(
                    '提交收录',
                    style: TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.bold,
                      color: Colors.white,
                    ),
                  ),
                ],
              ),
      ),
    );
  }

  Widget _buildTipsCard() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.blue[50],
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(Icons.lightbulb_outline, color: Colors.blue[700], size: 20),
              const SizedBox(width: 8),
              Text(
                '投稿提示',
                style: TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.bold,
                  color: Colors.blue[700],
                ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          Text(
            '• 支持原创诗词和经典古诗\n• 相似度超过80%将无法提交\n• 提交后等待审核通过\n• 平台信息自动识别：${_getPlatform()}',
            style: TextStyle(
              fontSize: 13,
              color: Colors.blue[700],
              height: 1.5,
            ),
          ),
        ],
      ),
    );
  }
}