import 'package:swagger_generator_flutter/core/models.dart';
import 'package:swagger_generator_flutter/utils/reference_resolver.dart';
import 'package:test/test.dart';

void main() {
  group('ReferenceResolver', () {
    late ReferenceResolver resolver;

    setUp(() {
      resolver = ReferenceResolver();
    });

    tearDown(() {
      resolver.clearCache();
    });

    test('resolves simple models without references', () {
      final componentsJson = {
        'schemas': {
          'User': {
            'type': 'object',
            'description': 'User model',
            'properties': {
              'id': {'type': 'integer'},
              'name': {'type': 'string'},
            },
            'required': ['id', 'name'],
          },
          'Product': {
            'type': 'object',
            'description': 'Product model',
            'properties': {
              'id': {'type': 'integer'},
              'title': {'type': 'string'},
              'price': {'type': 'number'},
            },
            'required': ['id', 'title'],
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 2);
      expect(models['User'], isNotNull);
      expect(models['User']!.name, 'User');
      expect(models['User']!.properties.length, 2);
      expect(models['User']!.required, ['id', 'name']);

      expect(models['Product'], isNotNull);
      expect(models['Product']!.name, 'Product');
      expect(models['Product']!.properties.length, 3);
      expect(models['Product']!.required, ['id', 'title']);
    });

    test('resolves models with allOf composition', () {
      final componentsJson = {
        'schemas': {
          'BaseEntity': {
            'type': 'object',
            'properties': {
              'id': {'type': 'integer'},
              'createdAt': {'type': 'string', 'format': 'date-time'},
            },
            'required': ['id'],
          },
          'User': {
            'allOf': [
              {'\$ref': '#/components/schemas/BaseEntity'},
              {
                'type': 'object',
                'properties': {
                  'name': {'type': 'string'},
                  'email': {'type': 'string'},
                },
                'required': ['name'],
              },
            ],
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 2);
      expect(models['User'], isNotNull);
      expect(models['User']!.isAllOf, true);
      expect(models['User']!.allOf.length, 2);

      // 检查合并的属性
      expect(
          models['User']!.properties.length, 4); // id, createdAt, name, email
      expect(models['User']!.properties['id'], isNotNull);
      expect(models['User']!.properties['name'], isNotNull);
      expect(models['User']!.properties['email'], isNotNull);
      expect(models['User']!.properties['createdAt'], isNotNull);
    });

    test('detects and handles circular references', () {
      final componentsJson = {
        'schemas': {
          'Node': {
            'type': 'object',
            'properties': {
              'id': {'type': 'integer'},
              'parent': {'\$ref': '#/components/schemas/Node'},
              'children': {
                'type': 'array',
                'items': {'\$ref': '#/components/schemas/Node'},
              },
            },
            'required': ['id'],
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 1);
      expect(models['Node'], isNotNull);
      expect(models['Node']!.name, 'Node');
      expect(models['Node']!.properties.length, 3);

      // 循环引用应该被正确处理，不会导致无限递归
      expect(models['Node']!.properties['parent'], isNotNull);
      expect(models['Node']!.properties['children'], isNotNull);
    });

    test('handles complex nested structures', () {
      final componentsJson = {
        'schemas': {
          'Address': {
            'type': 'object',
            'properties': {
              'street': {'type': 'string'},
              'city': {'type': 'string'},
              'coordinates': {
                'type': 'object',
                'properties': {
                  'lat': {'type': 'number'},
                  'lng': {'type': 'number'},
                },
                'required': ['lat', 'lng'],
              },
            },
            'required': ['street', 'city'],
          },
          'User': {
            'type': 'object',
            'properties': {
              'id': {'type': 'integer'},
              'name': {'type': 'string'},
              'addresses': {
                'type': 'array',
                'items': {'\$ref': '#/components/schemas/Address'},
              },
            },
            'required': ['id', 'name'],
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 2);
      expect(models['User'], isNotNull);
      expect(models['Address'], isNotNull);

      final userModel = models['User']!;
      expect(userModel.properties['addresses'], isNotNull);
      expect(userModel.properties['addresses']!.type, PropertyType.array);

      final addressModel = models['Address']!;
      expect(addressModel.properties['coordinates'], isNotNull);
      expect(addressModel.properties['coordinates']!.type, PropertyType.object);
    });

    test('handles enum models', () {
      final componentsJson = {
        'schemas': {
          'Status': {
            'type': 'string',
            'enum': ['active', 'inactive', 'pending'],
            'description': 'User status',
          },
          'Priority': {
            'type': 'integer',
            'enum': [1, 2, 3, 4, 5],
            'description': 'Priority level',
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 2);

      final statusModel = models['Status']!;
      expect(statusModel.isEnum, true);
      expect(statusModel.enumValues, ['active', 'inactive', 'pending']);
      expect(statusModel.enumType, PropertyType.string);

      final priorityModel = models['Priority']!;
      expect(priorityModel.isEnum, true);
      expect(priorityModel.enumValues, [1, 2, 3, 4, 5]);
      expect(priorityModel.enumType, PropertyType.integer);
    });

    test('handles oneOf with discriminator', () {
      final componentsJson = {
        'schemas': {
          'Pet': {
            'oneOf': [
              {'\$ref': '#/components/schemas/Cat'},
              {'\$ref': '#/components/schemas/Dog'},
            ],
            'discriminator': {
              'propertyName': 'petType',
              'mapping': {
                'cat': '#/components/schemas/Cat',
                'dog': '#/components/schemas/Dog',
              },
            },
          },
          'Cat': {
            'type': 'object',
            'properties': {
              'petType': {'type': 'string'},
              'meowSound': {'type': 'string'},
            },
            'required': ['petType'],
          },
          'Dog': {
            'type': 'object',
            'properties': {
              'petType': {'type': 'string'},
              'barkSound': {'type': 'string'},
            },
            'required': ['petType'],
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 3);

      final petModel = models['Pet']!;
      expect(petModel.isOneOf, true);
      expect(petModel.hasDiscriminator, true);
      expect(petModel.discriminator?.propertyName, 'petType');
      expect(petModel.discriminator?.mapping.length, 2);

      expect(models['Cat'], isNotNull);
      expect(models['Dog'], isNotNull);
    });

    test('respects maximum depth limit', () {
      final resolver = ReferenceResolver(maxDepth: 3);

      final componentsJson = {
        'schemas': {
          'DeepNested': {
            'type': 'object',
            'properties': {
              'level1': {
                'type': 'object',
                'properties': {
                  'level2': {
                    'type': 'object',
                    'properties': {
                      'level3': {
                        'type': 'object',
                        'properties': {
                          'level4': {'type': 'string'},
                        },
                      },
                    },
                  },
                },
              },
            },
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 1);
      expect(models['DeepNested'], isNotNull);

      // 应该能够解析，但深度受限
      final model = models['DeepNested']!;
      expect(model.properties['level1'], isNotNull);
    });

    test('handles parsing errors gracefully', () {
      final componentsJson = {
        'schemas': {
          'ValidModel': {
            'type': 'object',
            'properties': {
              'id': {'type': 'integer'},
            },
          },
          'InvalidModel': {
            // 故意创建一个可能导致解析错误的结构
            'properties': 'invalid_properties_value', // 这会导致类型错误
            'required': 123, // 这也会导致类型错误
          },
        },
      };

      final models = resolver.resolveModels(componentsJson);

      expect(models.length, 2);
      expect(models['ValidModel'], isNotNull);
      expect(models['InvalidModel'], isNotNull);

      // 无效模型应该被创建为后备模型
      final invalidModel = models['InvalidModel']!;
      expect(invalidModel.description, '解析失败的模型');
    });
  });
}