asset_assistant/frontend/asset_assistant/lib/pages/country_add_page.dart

import 'package:asset_assistant/utils/host_utils.dart';
import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:shared_preferences/shared_preferences.dart';

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

  @override
  State<AddCountryPage> createState() => _AddCountryPageState();
}

class _AddCountryPageState extends State<AddCountryPage> {
  // 输入控制器 - 新增国旗控制器
  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _codeController = TextEditingController();
  final TextEditingController _flagController = TextEditingController();

  // 加载状态
  bool _isLoading = false;

  // 表单验证键
  final _formKey = GlobalKey<FormState>();

  // 创建国家 - 调整请求数据
  Future<void> _createCountry() async {
    if (!_formKey.currentState!.validate()) {
      return;
    }

    setState(() {
      _isLoading = true;
    });

    try {
      // 获取用户ID（保持不变）
      final prefs = await SharedPreferences.getInstance();
      final userId = prefs.getString('user_id');
      if (userId == null) {
        if (mounted) {
          _showDialog('错误', '请先登录');
          Navigator.pushReplacementNamed(context, '/login');
        }
        return;
      }

      // 准备请求数据 - 新增flag字段
      final baseUrl = HostUtils().currentHost;
      const path = '/country/create';
      final url = '$baseUrl$path';

      final requestData = {
        'name': _nameController.text.trim(),
        'code': _codeController.text.trim(),
        'flag': _flagController.text.trim(), // 新增国旗参数
      };

      // 发送请求（保持不变）
      final dio = Dio();
      final response = await dio.post(
        url,
        data: requestData,
        options: Options(headers: {'Content-Type': 'application/json'}),
      );

      // 处理响应（保持不变）
      if (response.statusCode == 200) {
        final result = response.data;
        if (result['success'] == true) {
          if (mounted) {
            _showDialog('成功', '国家创建成功', () {
              Navigator.pop(context, true); // 返回并通知上一页刷新
            });
          }
        } else {
          if (mounted) {
            _showDialog('失败', result['message'] ?? '创建失败，请重试');
          }
        }
      } else {
        if (mounted) {
          // 处理400错误时获取服务器返回的具体消息
          String errorMessage = '服务器响应异常: ${response.statusCode}';
          if (response.statusCode == 400 && response.data != null) {
            errorMessage = response.data['message'] ?? errorMessage;
          }
          _showDialog('错误', errorMessage);
        }
      }
    } on DioException catch (e) {
      // 异常处理（优化错误信息提取）
      String errorMessage = '网络请求失败';
      if (e.response != null) {
        // 从响应数据中提取错误信息
        if (e.response?.data != null && e.response?.data['message'] != null) {
          errorMessage = e.response?.data['message'];
        } else {
          errorMessage = '请求失败: ${e.response?.statusCode}';
        }
      } else if (e.type == DioExceptionType.connectionTimeout) {
        errorMessage = '连接超时，请检查网络';
      } else if (e.type == DioExceptionType.connectionError) {
        errorMessage = '网络连接错误';
      }

      if (mounted) {
        _showDialog('错误', errorMessage);
      }
    } catch (e) {
      if (mounted) {
        _showDialog('错误', '发生未知错误: $e');
      }
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  // 显示对话框（保持不变）
  void _showDialog(String title, String content, [VoidCallback? onConfirm]) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text(title),
        content: Text(content),
        actions: [
          TextButton(
            onPressed: () {
              Navigator.pop(context);
              onConfirm?.call();
            },
            child: const Text('确定'),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Scaffold(
      appBar: AppBar(
        title: const Text('新增国家'),
        centerTitle: true,
        elevation: 4,
        shadowColor: Colors.black12,
        backgroundColor: theme.colorScheme.surfaceContainerHighest,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.save),
            onPressed: _isLoading ? null : _createCountry,
          ),
        ],
      ),
      body: SafeArea(
        child: Container(
          color: theme.colorScheme.surface,
          width: double.infinity,
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
          child: Form(
            key: _formKey,
            child: Column(
              children: [
                // 国家名称输入框（保持不变）
                TextFormField(
                  controller: _nameController,
                  style: TextStyle(color: theme.colorScheme.onSurface),
                  decoration: InputDecoration(
                    labelText: '国家名称',
                    hintText: '请输入国家名称',
                    prefixIcon: Icon(
                      Icons.account_balance,
                      color: theme.colorScheme.secondary,
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.trim().isEmpty) {
                      return '请输入国家名称';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 24),

                // 国家代码输入框（保持不变）
                TextFormField(
                  controller: _codeController,
                  style: TextStyle(color: theme.colorScheme.onSurface),
                  decoration: InputDecoration(
                    labelText: '国家代码',
                    hintText: '请输入国家代码',
                    prefixIcon: Icon(
                      Icons.code,
                      color: theme.colorScheme.secondary,
                    ),
                  ),
                  validator: (value) {
                    if (value == null || value.trim().isEmpty) {
                      return '请输入国家代码';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 24),

                // 新增国旗输入框
                TextFormField(
                  controller: _flagController,
                  style: TextStyle(color: theme.colorScheme.onSurface),
                  decoration: InputDecoration(
                    labelText: '国旗emoji',
                    hintText: '请输入国旗图片emoji',
                    prefixIcon: Icon(
                      Icons.flag,
                      color: theme.colorScheme.secondary,
                    ),
                  ),
                  // 国旗为可选字段，不添加验证器
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}