/**
 * Contract Validation Tests for Analytics Module
 * 
 * These tests validate that the analytics API DTOs and OpenAPI spec are consistent
 * and that the generated types will be compatible with the website analytics client.
 */

import * as fs from 'fs/promises';
import * as path from 'path';
import { describe, expect, it } from 'vitest';

interface OpenAPISchema {
  type?: string;
  format?: string;
  $ref?: string;
  items?: OpenAPISchema;
  properties?: Record<string, OpenAPISchema>;
  required?: string[];
  enum?: string[];
  nullable?: boolean;
  description?: string;
  default?: unknown;
}

interface OpenAPISpec {
  openapi: string;
  info: {
    title: string;
    description: string;
    version: string;
  };
  paths: Record<string, any>;
  components: {
    schemas: Record<string, OpenAPISchema>;
  };
}

describe('Analytics Module Contract Validation', () => {
  const apiRoot = path.join(__dirname, '../..');
  const openapiPath = path.join(apiRoot, 'apps/api/openapi.json');
  const generatedTypesDir = path.join(apiRoot, 'apps/website/lib/types/generated');
  const websiteTypesDir = path.join(apiRoot, 'apps/website/lib/types');

  describe('OpenAPI Spec Integrity for Analytics Endpoints', () => {
    it('should have analytics endpoints defined in OpenAPI spec', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      // Check for analytics endpoints
      expect(spec.paths['/analytics/page-view']).toBeDefined();
      expect(spec.paths['/analytics/engagement']).toBeDefined();
      expect(spec.paths['/analytics/dashboard']).toBeDefined();
      expect(spec.paths['/analytics/metrics']).toBeDefined();

      // Verify POST methods exist for recording endpoints
      expect(spec.paths['/analytics/page-view'].post).toBeDefined();
      expect(spec.paths['/analytics/engagement'].post).toBeDefined();

      // Verify GET methods exist for query endpoints
      expect(spec.paths['/analytics/dashboard'].get).toBeDefined();
      expect(spec.paths['/analytics/metrics'].get).toBeDefined();
    });

    it('should have RecordPageViewInputDTO schema defined', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordPageViewInputDTO'];
      expect(schema).toBeDefined();
      expect(schema.type).toBe('object');

      // Verify required fields
      expect(schema.required).toContain('entityType');
      expect(schema.required).toContain('entityId');
      expect(schema.required).toContain('visitorType');
      expect(schema.required).toContain('sessionId');

      // Verify field types
      expect(schema.properties?.entityType?.type).toBe('string');
      expect(schema.properties?.entityId?.type).toBe('string');
      expect(schema.properties?.visitorType?.type).toBe('string');
      expect(schema.properties?.sessionId?.type).toBe('string');

      // Verify optional fields
      expect(schema.properties?.visitorId).toBeDefined();
      expect(schema.properties?.referrer).toBeDefined();
      expect(schema.properties?.userAgent).toBeDefined();
      expect(schema.properties?.country).toBeDefined();
    });

    it('should have RecordPageViewOutputDTO schema defined', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordPageViewOutputDTO'];
      expect(schema).toBeDefined();
      expect(schema.type).toBe('object');

      // Verify required fields
      expect(schema.required).toContain('pageViewId');

      // Verify field types
      expect(schema.properties?.pageViewId?.type).toBe('string');
    });

    it('should have RecordEngagementInputDTO schema defined', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordEngagementInputDTO'];
      expect(schema).toBeDefined();
      expect(schema.type).toBe('object');

      // Verify required fields
      expect(schema.required).toContain('action');
      expect(schema.required).toContain('entityType');
      expect(schema.required).toContain('entityId');
      expect(schema.required).toContain('actorType');
      expect(schema.required).toContain('sessionId');

      // Verify field types
      expect(schema.properties?.action?.type).toBe('string');
      expect(schema.properties?.entityType?.type).toBe('string');
      expect(schema.properties?.entityId?.type).toBe('string');
      expect(schema.properties?.actorType?.type).toBe('string');
      expect(schema.properties?.sessionId?.type).toBe('string');

      // Verify optional fields
      expect(schema.properties?.actorId).toBeDefined();
      expect(schema.properties?.metadata).toBeDefined();
    });

    it('should have RecordEngagementOutputDTO schema defined', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordEngagementOutputDTO'];
      expect(schema).toBeDefined();
      expect(schema.type).toBe('object');

      // Verify required fields
      expect(schema.required).toContain('eventId');
      expect(schema.required).toContain('engagementWeight');

      // Verify field types
      expect(schema.properties?.eventId?.type).toBe('string');
      expect(schema.properties?.engagementWeight?.type).toBe('number');
    });

    it('should have GetAnalyticsMetricsOutputDTO schema defined', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['GetAnalyticsMetricsOutputDTO'];
      expect(schema).toBeDefined();
      expect(schema.type).toBe('object');

      // Verify required fields
      expect(schema.required).toContain('pageViews');
      expect(schema.required).toContain('uniqueVisitors');
      expect(schema.required).toContain('averageSessionDuration');
      expect(schema.required).toContain('bounceRate');

      // Verify field types
      expect(schema.properties?.pageViews?.type).toBe('number');
      expect(schema.properties?.uniqueVisitors?.type).toBe('number');
      expect(schema.properties?.averageSessionDuration?.type).toBe('number');
      expect(schema.properties?.bounceRate?.type).toBe('number');
    });

    it('should have GetDashboardDataOutputDTO schema defined', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['GetDashboardDataOutputDTO'];
      expect(schema).toBeDefined();
      expect(schema.type).toBe('object');

      // Verify required fields
      expect(schema.required).toContain('totalUsers');
      expect(schema.required).toContain('activeUsers');
      expect(schema.required).toContain('totalRaces');
      expect(schema.required).toContain('totalLeagues');

      // Verify field types
      expect(schema.properties?.totalUsers?.type).toBe('number');
      expect(schema.properties?.activeUsers?.type).toBe('number');
      expect(schema.properties?.totalRaces?.type).toBe('number');
      expect(schema.properties?.totalLeagues?.type).toBe('number');
    });

    it('should have proper request/response structure for page-view endpoint', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const pageViewPath = spec.paths['/analytics/page-view']?.post;
      expect(pageViewPath).toBeDefined();

      // Verify request body
      const requestBody = pageViewPath.requestBody;
      expect(requestBody).toBeDefined();
      expect(requestBody.content['application/json']).toBeDefined();
      expect(requestBody.content['application/json'].schema.$ref).toBe('#/components/schemas/RecordPageViewInputDTO');

      // Verify response
      const response201 = pageViewPath.responses['201'];
      expect(response201).toBeDefined();
      expect(response201.content['application/json'].schema.$ref).toBe('#/components/schemas/RecordPageViewOutputDTO');
    });

    it('should have proper request/response structure for engagement endpoint', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const engagementPath = spec.paths['/analytics/engagement']?.post;
      expect(engagementPath).toBeDefined();

      // Verify request body
      const requestBody = engagementPath.requestBody;
      expect(requestBody).toBeDefined();
      expect(requestBody.content['application/json']).toBeDefined();
      expect(requestBody.content['application/json'].schema.$ref).toBe('#/components/schemas/RecordEngagementInputDTO');

      // Verify response
      const response201 = engagementPath.responses['201'];
      expect(response201).toBeDefined();
      expect(response201.content['application/json'].schema.$ref).toBe('#/components/schemas/RecordEngagementOutputDTO');
    });

    it('should have proper response structure for metrics endpoint', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const metricsPath = spec.paths['/analytics/metrics']?.get;
      expect(metricsPath).toBeDefined();

      // Verify response
      const response200 = metricsPath.responses['200'];
      expect(response200).toBeDefined();
      expect(response200.content['application/json'].schema.$ref).toBe('#/components/schemas/GetAnalyticsMetricsOutputDTO');
    });

    it('should have proper response structure for dashboard endpoint', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const dashboardPath = spec.paths['/analytics/dashboard']?.get;
      expect(dashboardPath).toBeDefined();

      // Verify response
      const response200 = dashboardPath.responses['200'];
      expect(response200).toBeDefined();
      expect(response200.content['application/json'].schema.$ref).toBe('#/components/schemas/GetDashboardDataOutputDTO');
    });
  });

  describe('DTO Consistency', () => {
    it('should have generated DTO files for analytics schemas', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const generatedFiles = await fs.readdir(generatedTypesDir);
      const generatedDTOs = generatedFiles
        .filter(f => f.endsWith('.ts'))
        .map(f => f.replace('.ts', ''));

      // Check for analytics-related DTOs
      const analyticsDTOs = [
        'RecordPageViewInputDTO',
        'RecordPageViewOutputDTO',
        'RecordEngagementInputDTO',
        'RecordEngagementOutputDTO',
        'GetAnalyticsMetricsOutputDTO',
        'GetDashboardDataOutputDTO',
      ];

      for (const dtoName of analyticsDTOs) {
        expect(spec.components.schemas[dtoName]).toBeDefined();
        expect(generatedDTOs).toContain(dtoName);
      }
    });

    it('should have consistent property types between DTOs and schemas', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);
      const schemas = spec.components.schemas;

      // Test RecordPageViewInputDTO
      const pageViewSchema = schemas['RecordPageViewInputDTO'];
      const pageViewDtoPath = path.join(generatedTypesDir, 'RecordPageViewInputDTO.ts');
      const pageViewDtoExists = await fs.access(pageViewDtoPath).then(() => true).catch(() => false);
      
      if (pageViewDtoExists) {
        const pageViewDtoContent = await fs.readFile(pageViewDtoPath, 'utf-8');
        
        // Check that all properties are present
        if (pageViewSchema.properties) {
          for (const propName of Object.keys(pageViewSchema.properties)) {
            expect(pageViewDtoContent).toContain(propName);
          }
        }
      }

      // Test RecordEngagementInputDTO
      const engagementSchema = schemas['RecordEngagementInputDTO'];
      const engagementDtoPath = path.join(generatedTypesDir, 'RecordEngagementInputDTO.ts');
      const engagementDtoExists = await fs.access(engagementDtoPath).then(() => true).catch(() => false);
      
      if (engagementDtoExists) {
        const engagementDtoContent = await fs.readFile(engagementDtoPath, 'utf-8');
        
        // Check that all properties are present
        if (engagementSchema.properties) {
          for (const propName of Object.keys(engagementSchema.properties)) {
            expect(engagementDtoContent).toContain(propName);
          }
        }
      }

      // Test GetAnalyticsMetricsOutputDTO
      const metricsSchema = schemas['GetAnalyticsMetricsOutputDTO'];
      const metricsDtoPath = path.join(generatedTypesDir, 'GetAnalyticsMetricsOutputDTO.ts');
      const metricsDtoExists = await fs.access(metricsDtoPath).then(() => true).catch(() => false);
      
      if (metricsDtoExists) {
        const metricsDtoContent = await fs.readFile(metricsDtoPath, 'utf-8');
        
        // Check that all required properties are present
        if (metricsSchema.required) {
          for (const requiredProp of metricsSchema.required) {
            expect(metricsDtoContent).toContain(requiredProp);
          }
        }
      }

      // Test GetDashboardDataOutputDTO
      const dashboardSchema = schemas['GetDashboardDataOutputDTO'];
      const dashboardDtoPath = path.join(generatedTypesDir, 'GetDashboardDataOutputDTO.ts');
      const dashboardDtoExists = await fs.access(dashboardDtoPath).then(() => true).catch(() => false);
      
      if (dashboardDtoExists) {
        const dashboardDtoContent = await fs.readFile(dashboardDtoPath, 'utf-8');
        
        // Check that all required properties are present
        if (dashboardSchema.required) {
          for (const requiredProp of dashboardSchema.required) {
            expect(dashboardDtoContent).toContain(requiredProp);
          }
        }
      }
    });

    it('should have analytics types defined in tbd folder', async () => {
      // Check if analytics types exist in tbd folder (similar to admin types)
      const tbdDir = path.join(websiteTypesDir, 'tbd');
      const tbdFiles = await fs.readdir(tbdDir).catch(() => []);
      
      // Analytics types might be in a separate file or combined with existing types
      // For now, we'll check if the generated types are properly available
      const generatedFiles = await fs.readdir(generatedTypesDir);
      const analyticsGenerated = generatedFiles.filter(f => 
        f.includes('Analytics') || 
        f.includes('Record') || 
        f.includes('PageView') || 
        f.includes('Engagement')
      );
      
      expect(analyticsGenerated.length).toBeGreaterThanOrEqual(6);
    });

    it('should have analytics types re-exported from main types file', async () => {
      // Check if there's an analytics.ts file or if types are exported elsewhere
      const analyticsTypesPath = path.join(websiteTypesDir, 'analytics.ts');
      const analyticsTypesExists = await fs.access(analyticsTypesPath).then(() => true).catch(() => false);
      
      if (analyticsTypesExists) {
        const analyticsTypesContent = await fs.readFile(analyticsTypesPath, 'utf-8');
        
        // Verify re-exports
        expect(analyticsTypesContent).toContain('RecordPageViewInputDTO');
        expect(analyticsTypesContent).toContain('RecordEngagementInputDTO');
        expect(analyticsTypesContent).toContain('GetAnalyticsMetricsOutputDTO');
        expect(analyticsTypesContent).toContain('GetDashboardDataOutputDTO');
      }
    });
  });

  describe('Analytics API Client Contract', () => {
    it('should have AnalyticsApiClient defined', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientExists = await fs.access(analyticsApiClientPath).then(() => true).catch(() => false);
      
      expect(analyticsApiClientExists).toBe(true);

      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify class definition
      expect(analyticsApiClientContent).toContain('export class AnalyticsApiClient');
      expect(analyticsApiClientContent).toContain('extends BaseApiClient');

      // Verify methods exist
      expect(analyticsApiClientContent).toContain('recordPageView');
      expect(analyticsApiClientContent).toContain('recordEngagement');
      expect(analyticsApiClientContent).toContain('getDashboardData');
      expect(analyticsApiClientContent).toContain('getAnalyticsMetrics');

      // Verify method signatures
      expect(analyticsApiClientContent).toContain('recordPageView(input: RecordPageViewInputDTO)');
      expect(analyticsApiClientContent).toContain('recordEngagement(input: RecordEngagementInputDTO)');
      expect(analyticsApiClientContent).toContain('getDashboardData()');
      expect(analyticsApiClientContent).toContain('getAnalyticsMetrics()');
    });

    it('should have proper request construction in recordPageView method', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify POST request with input
      expect(analyticsApiClientContent).toContain("return this.post<RecordPageViewOutputDTO>('/analytics/page-view', input)");
    });

    it('should have proper request construction in recordEngagement method', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify POST request with input
      expect(analyticsApiClientContent).toContain("return this.post<RecordEngagementOutputDTO>('/analytics/engagement', input)");
    });

    it('should have proper request construction in getDashboardData method', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify GET request
      expect(analyticsApiClientContent).toContain("return this.get<GetDashboardDataOutputDTO>('/analytics/dashboard')");
    });

    it('should have proper request construction in getAnalyticsMetrics method', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify GET request
      expect(analyticsApiClientContent).toContain("return this.get<GetAnalyticsMetricsOutputDTO>('/analytics/metrics')");
    });
  });

  describe('Request Correctness Tests', () => {
    it('should validate RecordPageViewInputDTO required fields', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordPageViewInputDTO'];

      // Verify all required fields are present
      expect(schema.required).toContain('entityType');
      expect(schema.required).toContain('entityId');
      expect(schema.required).toContain('visitorType');
      expect(schema.required).toContain('sessionId');

      // Verify no extra required fields
      expect(schema.required.length).toBe(4);
    });

    it('should validate RecordPageViewInputDTO optional fields', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordPageViewInputDTO'];

      // Verify optional fields are not required
      expect(schema.required).not.toContain('visitorId');
      expect(schema.required).not.toContain('referrer');
      expect(schema.required).not.toContain('userAgent');
      expect(schema.required).not.toContain('country');

      // Verify optional fields exist
      expect(schema.properties?.visitorId).toBeDefined();
      expect(schema.properties?.referrer).toBeDefined();
      expect(schema.properties?.userAgent).toBeDefined();
      expect(schema.properties?.country).toBeDefined();
    });

    it('should validate RecordEngagementInputDTO required fields', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordEngagementInputDTO'];

      // Verify all required fields are present
      expect(schema.required).toContain('action');
      expect(schema.required).toContain('entityType');
      expect(schema.required).toContain('entityId');
      expect(schema.required).toContain('actorType');
      expect(schema.required).toContain('sessionId');

      // Verify no extra required fields
      expect(schema.required.length).toBe(5);
    });

    it('should validate RecordEngagementInputDTO optional fields', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordEngagementInputDTO'];

      // Verify optional fields are not required
      expect(schema.required).not.toContain('actorId');
      expect(schema.required).not.toContain('metadata');

      // Verify optional fields exist
      expect(schema.properties?.actorId).toBeDefined();
      expect(schema.properties?.metadata).toBeDefined();
    });

    it('should validate GetAnalyticsMetricsOutputDTO structure', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['GetAnalyticsMetricsOutputDTO'];

      // Verify all required fields
      expect(schema.required).toContain('pageViews');
      expect(schema.required).toContain('uniqueVisitors');
      expect(schema.required).toContain('averageSessionDuration');
      expect(schema.required).toContain('bounceRate');

      // Verify field types
      expect(schema.properties?.pageViews?.type).toBe('number');
      expect(schema.properties?.uniqueVisitors?.type).toBe('number');
      expect(schema.properties?.averageSessionDuration?.type).toBe('number');
      expect(schema.properties?.bounceRate?.type).toBe('number');
    });

    it('should validate GetDashboardDataOutputDTO structure', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['GetDashboardDataOutputDTO'];

      // Verify all required fields
      expect(schema.required).toContain('totalUsers');
      expect(schema.required).toContain('activeUsers');
      expect(schema.required).toContain('totalRaces');
      expect(schema.required).toContain('totalLeagues');

      // Verify field types
      expect(schema.properties?.totalUsers?.type).toBe('number');
      expect(schema.properties?.activeUsers?.type).toBe('number');
      expect(schema.properties?.totalRaces?.type).toBe('number');
      expect(schema.properties?.totalLeagues?.type).toBe('number');
    });
  });

  describe('Response Handling Tests', () => {
    it('should handle successful page view recording response', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const pageViewSchema = spec.components.schemas['RecordPageViewOutputDTO'];

      // Verify response structure
      expect(pageViewSchema.properties?.pageViewId).toBeDefined();
      expect(pageViewSchema.properties?.pageViewId?.type).toBe('string');
      expect(pageViewSchema.required).toContain('pageViewId');
    });

    it('should handle successful engagement recording response', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const engagementSchema = spec.components.schemas['RecordEngagementOutputDTO'];

      // Verify response structure
      expect(engagementSchema.properties?.eventId).toBeDefined();
      expect(engagementSchema.properties?.engagementWeight).toBeDefined();
      expect(engagementSchema.properties?.eventId?.type).toBe('string');
      expect(engagementSchema.properties?.engagementWeight?.type).toBe('number');
      expect(engagementSchema.required).toContain('eventId');
      expect(engagementSchema.required).toContain('engagementWeight');
    });

    it('should handle metrics response with all required fields', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const metricsSchema = spec.components.schemas['GetAnalyticsMetricsOutputDTO'];

      // Verify all required fields are present
      for (const field of ['pageViews', 'uniqueVisitors', 'averageSessionDuration', 'bounceRate']) {
        expect(metricsSchema.required).toContain(field);
        expect(metricsSchema.properties?.[field]).toBeDefined();
        expect(metricsSchema.properties?.[field]?.type).toBe('number');
      }
    });

    it('should handle dashboard data response with all required fields', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const dashboardSchema = spec.components.schemas['GetDashboardDataOutputDTO'];

      // Verify all required fields are present
      for (const field of ['totalUsers', 'activeUsers', 'totalRaces', 'totalLeagues']) {
        expect(dashboardSchema.required).toContain(field);
        expect(dashboardSchema.properties?.[field]).toBeDefined();
        expect(dashboardSchema.properties?.[field]?.type).toBe('number');
      }
    });

    it('should handle optional fields in page view input correctly', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordPageViewInputDTO'];

      // Verify optional fields are nullable or optional
      expect(schema.properties?.visitorId?.type).toBe('string');
      expect(schema.properties?.referrer?.type).toBe('string');
      expect(schema.properties?.userAgent?.type).toBe('string');
      expect(schema.properties?.country?.type).toBe('string');
    });

    it('should handle optional fields in engagement input correctly', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const schema = spec.components.schemas['RecordEngagementInputDTO'];

      // Verify optional fields
      expect(schema.properties?.actorId?.type).toBe('string');
      expect(schema.properties?.metadata?.type).toBe('object');
    });
  });

  describe('Error Handling Tests', () => {
    it('should document 400 Bad Request response for invalid page view input', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const pageViewPath = spec.paths['/analytics/page-view']?.post;

      // Check if 400 response is documented
      if (pageViewPath.responses['400']) {
        expect(pageViewPath.responses['400']).toBeDefined();
      }
    });

    it('should document 400 Bad Request response for invalid engagement input', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const engagementPath = spec.paths['/analytics/engagement']?.post;

      // Check if 400 response is documented
      if (engagementPath.responses['400']) {
        expect(engagementPath.responses['400']).toBeDefined();
      }
    });

    it('should document 401 Unauthorized response for protected endpoints', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      // Dashboard and metrics endpoints should require authentication
      const dashboardPath = spec.paths['/analytics/dashboard']?.get;
      const metricsPath = spec.paths['/analytics/metrics']?.get;

      // Check if 401 responses are documented
      if (dashboardPath.responses['401']) {
        expect(dashboardPath.responses['401']).toBeDefined();
      }
      if (metricsPath.responses['401']) {
        expect(metricsPath.responses['401']).toBeDefined();
      }
    });

    it('should document 500 Internal Server Error response', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const pageViewPath = spec.paths['/analytics/page-view']?.post;
      const engagementPath = spec.paths['/analytics/engagement']?.post;

      // Check if 500 response is documented for recording endpoints
      if (pageViewPath.responses['500']) {
        expect(pageViewPath.responses['500']).toBeDefined();
      }
      if (engagementPath.responses['500']) {
        expect(engagementPath.responses['500']).toBeDefined();
      }
    });

    it('should have proper error handling in AnalyticsApiClient', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify BaseApiClient is extended (which provides error handling)
      expect(analyticsApiClientContent).toContain('extends BaseApiClient');

      // Verify methods use BaseApiClient methods (which handle errors)
      expect(analyticsApiClientContent).toContain('this.post<');
      expect(analyticsApiClientContent).toContain('this.get<');
    });
  });

  describe('Semantic Guarantee Tests', () => {
    it('should maintain consistency between request and response schemas', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      // Verify page view request/response consistency
      const pageViewInputSchema = spec.components.schemas['RecordPageViewInputDTO'];
      const pageViewOutputSchema = spec.components.schemas['RecordPageViewOutputDTO'];

      // Output should contain a reference to the input (pageViewId relates to the recorded page view)
      expect(pageViewOutputSchema.properties?.pageViewId).toBeDefined();
      expect(pageViewOutputSchema.properties?.pageViewId?.type).toBe('string');

      // Verify engagement request/response consistency
      const engagementInputSchema = spec.components.schemas['RecordEngagementInputDTO'];
      const engagementOutputSchema = spec.components.schemas['RecordEngagementOutputDTO'];

      // Output should contain event reference and engagement weight
      expect(engagementOutputSchema.properties?.eventId).toBeDefined();
      expect(engagementOutputSchema.properties?.engagementWeight).toBeDefined();
    });

    it('should validate semantic consistency in analytics metrics', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const metricsSchema = spec.components.schemas['GetAnalyticsMetricsOutputDTO'];

      // Verify metrics are non-negative numbers
      expect(metricsSchema.properties?.pageViews?.type).toBe('number');
      expect(metricsSchema.properties?.uniqueVisitors?.type).toBe('number');
      expect(metricsSchema.properties?.averageSessionDuration?.type).toBe('number');
      expect(metricsSchema.properties?.bounceRate?.type).toBe('number');

      // Verify bounce rate is a percentage (0-1 range or 0-100)
      // This is a semantic guarantee that should be documented
      expect(metricsSchema.properties?.bounceRate).toBeDefined();
    });

    it('should validate semantic consistency in dashboard data', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const dashboardSchema = spec.components.schemas['GetDashboardDataOutputDTO'];

      // Verify dashboard metrics are non-negative numbers
      expect(dashboardSchema.properties?.totalUsers?.type).toBe('number');
      expect(dashboardSchema.properties?.activeUsers?.type).toBe('number');
      expect(dashboardSchema.properties?.totalRaces?.type).toBe('number');
      expect(dashboardSchema.properties?.totalLeagues?.type).toBe('number');

      // Semantic guarantee: activeUsers <= totalUsers
      // This should be enforced by the backend
      expect(dashboardSchema.properties?.activeUsers).toBeDefined();
      expect(dashboardSchema.properties?.totalUsers).toBeDefined();
    });

    it('should validate idempotency for analytics recording', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      // Check if recording endpoints support idempotency
      const pageViewPath = spec.paths['/analytics/page-view']?.post;
      const engagementPath = spec.paths['/analytics/engagement']?.post;

      // Verify session-based deduplication is possible
      const pageViewSchema = spec.components.schemas['RecordPageViewInputDTO'];
      const engagementSchema = spec.components.schemas['RecordEngagementInputDTO'];

      // Both should have sessionId for deduplication
      expect(pageViewSchema.properties?.sessionId).toBeDefined();
      expect(engagementSchema.properties?.sessionId).toBeDefined();
    });

    it('should validate uniqueness constraints for analytics entities', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const pageViewSchema = spec.components.schemas['RecordPageViewInputDTO'];
      const engagementSchema = spec.components.schemas['RecordEngagementInputDTO'];

      // Verify entity identification fields are required
      expect(pageViewSchema.required).toContain('entityType');
      expect(pageViewSchema.required).toContain('entityId');
      expect(pageViewSchema.required).toContain('sessionId');

      expect(engagementSchema.required).toContain('entityType');
      expect(engagementSchema.required).toContain('entityId');
      expect(engagementSchema.required).toContain('sessionId');
    });

    it('should validate consistency between request and response types', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      // Verify all DTOs have consistent type definitions
      const dtos = [
        'RecordPageViewInputDTO',
        'RecordPageViewOutputDTO',
        'RecordEngagementInputDTO',
        'RecordEngagementOutputDTO',
        'GetAnalyticsMetricsOutputDTO',
        'GetDashboardDataOutputDTO',
      ];

      for (const dtoName of dtos) {
        const schema = spec.components.schemas[dtoName];
        expect(schema).toBeDefined();
        expect(schema.type).toBe('object');
        
        // All should have properties defined
        expect(schema.properties).toBeDefined();
        
        // All should have required fields (even if empty array)
        expect(schema.required).toBeDefined();
      }
    });
  });

  describe('Analytics Module Integration Tests', () => {
    it('should have consistent types between API DTOs and website types', async () => {
      const content = await fs.readFile(openapiPath, 'utf-8');
      const spec: OpenAPISpec = JSON.parse(content);

      const generatedFiles = await fs.readdir(generatedTypesDir);
      const generatedDTOs = generatedFiles
        .filter(f => f.endsWith('.ts'))
        .map(f => f.replace('.ts', ''));

      // Check all analytics DTOs exist in generated types
      const analyticsDTOs = [
        'RecordPageViewInputDTO',
        'RecordPageViewOutputDTO',
        'RecordEngagementInputDTO',
        'RecordEngagementOutputDTO',
        'GetAnalyticsMetricsOutputDTO',
        'GetDashboardDataOutputDTO',
      ];

      for (const dtoName of analyticsDTOs) {
        expect(spec.components.schemas[dtoName]).toBeDefined();
        expect(generatedDTOs).toContain(dtoName);
      }
    });

    it('should have AnalyticsApiClient methods matching API endpoints', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify recordPageView method exists and uses correct endpoint
      expect(analyticsApiClientContent).toContain('async recordPageView');
      expect(analyticsApiClientContent).toContain("return this.post<RecordPageViewOutputDTO>('/analytics/page-view', input)");

      // Verify recordEngagement method exists and uses correct endpoint
      expect(analyticsApiClientContent).toContain('async recordEngagement');
      expect(analyticsApiClientContent).toContain("return this.post<RecordEngagementOutputDTO>('/analytics/engagement', input)");

      // Verify getDashboardData method exists and uses correct endpoint
      expect(analyticsApiClientContent).toContain('async getDashboardData');
      expect(analyticsApiClientContent).toContain("return this.get<GetDashboardDataOutputDTO>('/analytics/dashboard')");

      // Verify getAnalyticsMetrics method exists and uses correct endpoint
      expect(analyticsApiClientContent).toContain('async getAnalyticsMetrics');
      expect(analyticsApiClientContent).toContain("return this.get<GetAnalyticsMetricsOutputDTO>('/analytics/metrics')");
    });

    it('should have proper error handling in AnalyticsApiClient', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify BaseApiClient is extended (which provides error handling)
      expect(analyticsApiClientContent).toContain('extends BaseApiClient');

      // Verify methods use BaseApiClient methods (which handle errors)
      expect(analyticsApiClientContent).toContain('this.post<');
      expect(analyticsApiClientContent).toContain('this.get<');
    });

    it('should have consistent type imports in AnalyticsApiClient', async () => {
      const analyticsApiClientPath = path.join(apiRoot, 'apps/website/lib/api/analytics/AnalyticsApiClient.ts');
      const analyticsApiClientContent = await fs.readFile(analyticsApiClientPath, 'utf-8');

      // Verify all required types are imported
      expect(analyticsApiClientContent).toContain('RecordPageViewOutputDTO');
      expect(analyticsApiClientContent).toContain('RecordEngagementOutputDTO');
      expect(analyticsApiClientContent).toContain('GetDashboardDataOutputDTO');
      expect(analyticsApiClientContent).toContain('GetAnalyticsMetricsOutputDTO');
      expect(analyticsApiClientContent).toContain('RecordPageViewInputDTO');
      expect(analyticsApiClientContent).toContain('RecordEngagementInputDTO');
    });
  });
});