/// 基础使用示例
/// 演示如何使用 Swagger Generator Flutter 生成基础的 API 代码
library;

import 'dart:convert';
import 'dart:io';
import 'package:swagger_generator_flutter/swagger_generator_flutter.dart';

void main() async {
  print('🚀 基础使用示例');
  print('=' * 50);

  try {
    // 1. 读取 OpenAPI 文档
    print('📖 读取 OpenAPI 文档...');
    final jsonString = await File('swagger.json').readAsString();
    print('✅ 文档大小: ${(jsonString.length / 1024).toStringAsFixed(2)}KB');

    // 2. 解析文档
    print('\n🔍 解析文档...');
    final document = SwaggerDocument.fromJson(jsonDecode(jsonString));
    print('✅ 解析完成');
    print('   - 标题: ${document.title}');
    print('   - 版本: ${document.version}');
    print('   - 路径数: ${document.paths.length}');
    print('   - 模型数: ${document.models.length}');

    // 3. 验证文档
    print('\n✅ 验证文档...');
    final validator = EnhancedValidator(
      includeWarnings: true,
    );

    final isValid = validator.validateDocument(document);
    final errors =
        validator.errorReporter.getErrorsBySeverity(ErrorSeverity.error);
    final warnings =
        validator.errorReporter.getErrorsBySeverity(ErrorSeverity.warning);

    print('   - 验证结果: ${isValid ? "通过" : "失败"}');
    print('   - 错误数: ${errors.length}');
    print('   - 警告数: ${warnings.length}');

    if (errors.isNotEmpty) {
      print('\n❌ 发现错误:');
      for (final error in errors.take(3)) {
        print('   - ${error.title}: ${error.description}');
      }
    }

    // 4. 生成基础 API 代码
    print('\n🔧 生成基础 API 代码...');
    final generator = RetrofitApiGenerator(
      className: 'BasicApiService',
      splitByTags: true, // 使用拆分模式
      useRetrofit: true,
      generateModels: true,
    );

    final generatedCode = generator.generateFromDocument(document);
    print('✅ 代码生成完成');
    print('   - 代码大小: ${(generatedCode.length / 1024).toStringAsFixed(2)}KB');
    print('   - 代码行数: ${generatedCode.split('\n').length}');

    // 5. 保存生成的代码
    print('\n💾 保存生成的代码...');
    final outputDir = Directory('example/generated');
    if (!outputDir.existsSync()) {
      outputDir.createSync(recursive: true);
    }

    final outputFile = File('example/generated/basic_api_service.dart');
    await outputFile.writeAsString(generatedCode);
    print('✅ 代码已保存到: ${outputFile.path}');

    // 6. 显示生成的代码片段
    print('\n📄 生成的代码片段:');
    print('-' * 30);
    final lines = generatedCode.split('\n');
    for (int i = 0; i < 20 && i < lines.length; i++) {
      print('${(i + 1).toString().padLeft(2)}: ${lines[i]}');
    }
    if (lines.length > 20) {
      print('... (还有 ${lines.length - 20} 行)');
    }

    print('\n🎉 基础使用示例完成！');
  } catch (e, stackTrace) {
    print('❌ 发生错误: $e');
    print('堆栈跟踪: $stackTrace');
  }
}

/// 创建示例 OpenAPI 文档
Future<void> createSampleDocument() async {
  final sampleDoc = {
    'openapi': '3.0.3',
    'info': {
      'title': 'Sample API',
      'version': '1.0.0',
      'description': 'A sample API for demonstration',
    },
    'servers': [
      {
        'url': 'https://api.example.com',
        'description': 'Production server',
      },
    ],
    'paths': {
      '/users': {
        'get': {
          'summary': 'Get all users',
          'operationId': 'getUsers',
          'tags': ['users'],
          'parameters': [
            {
              'name': 'page',
              'in': 'query',
              'required': false,
              'schema': {'type': 'integer', 'default': 1},
              'description': 'Page number',
            },
          ],
          'responses': {
            '200': {
              'description': 'Success',
              'content': {
                'application/json': {
                  'schema': {
                    'type': 'array',
                    'items': {
                      '\$ref': '#/components/schemas/User',
                    },
                  },
                },
              },
            },
          },
        },
        'post': {
          'summary': 'Create user',
          'operationId': 'createUser',
          'tags': ['users'],
          'requestBody': {
            'required': true,
            'content': {
              'application/json': {
                'schema': {
                  '\$ref': '#/components/schemas/CreateUserRequest',
                },
              },
            },
          },
          'responses': {
            '201': {
              'description': 'User created',
              'content': {
                'application/json': {
                  'schema': {
                    '\$ref': '#/components/schemas/User',
                  },
                },
              },
            },
          },
        },
      },
      '/users/{id}': {
        'get': {
          'summary': 'Get user by ID',
          'operationId': 'getUserById',
          'tags': ['users'],
          'parameters': [
            {
              'name': 'id',
              'in': 'path',
              'required': true,
              'schema': {'type': 'integer'},
              'description': 'User ID',
            },
          ],
          'responses': {
            '200': {
              'description': 'User found',
              'content': {
                'application/json': {
                  'schema': {
                    '\$ref': '#/components/schemas/User',
                  },
                },
              },
            },
            '404': {
              'description': 'User not found',
            },
          },
        },
      },
    },
    'components': {
      'schemas': {
        'User': {
          'type': 'object',
          'properties': {
            'id': {'type': 'integer', 'format': 'int64'},
            'name': {'type': 'string'},
            'email': {'type': 'string', 'format': 'email'},
            'createdAt': {'type': 'string', 'format': 'date-time'},
          },
          'required': ['id', 'name', 'email'],
        },
        'CreateUserRequest': {
          'type': 'object',
          'properties': {
            'name': {'type': 'string'},
            'email': {'type': 'string', 'format': 'email'},
          },
          'required': ['name', 'email'],
        },
      },
    },
  };

  final jsonString = const JsonEncoder.withIndent('  ').convert(sampleDoc);
  await File('example/sample_swagger.json').writeAsString(jsonString);
  print('✅ 示例文档已创建: example/sample_swagger.json');
}

/// 运行示例
///
/// 使用方法:
/// ```bash
/// dart run example/basic_usage.dart
/// ```
///
/// 或者创建示例文档:
/// ```dart
/// await createSampleDocument();
/// ```