// IRU Load Testing Suite
// Performance, stress, and capacity testing

import { describe, it, expect, beforeAll, afterAll } from '@jest/globals';

/**
 * Load Testing Suite for IRU System
 * 
 * This suite tests:
 * - API endpoint performance under load
 * - Database query performance
 * - Concurrent request handling
 * - Resource exhaustion scenarios
 * - Stress testing
 * - Capacity planning
 */

describe('IRU Load Testing', () => {
  const baseUrl = process.env.API_BASE_URL || 'http://localhost:3000';
  const concurrency = parseInt(process.env.LOAD_TEST_CONCURRENCY || '10');
  const requestsPerSecond = parseInt(process.env.LOAD_TEST_RPS || '100');

  beforeAll(() => {
    // Setup load testing environment
    console.log('Setting up load testing environment...');
  });

  afterAll(() => {
    // Cleanup
    console.log('Cleaning up load testing environment...');
  });

  describe('Marketplace API Load Tests', () => {
    it('should handle concurrent offering requests', async () => {
      const requests = Array.from({ length: concurrency }, () =>
        fetch(`${baseUrl}/api/v1/iru/marketplace/offerings`)
      );

      const startTime = Date.now();
      const responses = await Promise.all(requests);
      const duration = Date.now() - startTime;

      const successCount = responses.filter((r) => r.ok).length;
      const avgResponseTime = duration / concurrency;

      expect(successCount).toBe(concurrency);
      expect(avgResponseTime).toBeLessThan(1000); // < 1 second average

      console.log(`Marketplace load test: ${successCount}/${concurrency} successful, avg ${avgResponseTime}ms`);
    });

    it('should handle high RPS inquiry submissions', async () => {
      const inquiry = {
        offeringId: 'OFF-001',
        organizationName: 'Test Bank',
        institutionalType: 'CommercialBank',
        jurisdiction: 'US',
        contactEmail: 'test@example.com',
        contactName: 'Test User',
      };

      const requests = Array.from({ length: requestsPerSecond }, () =>
        fetch(`${baseUrl}/api/v1/iru/marketplace/inquiries`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(inquiry),
        })
      );

      const startTime = Date.now();
      const responses = await Promise.all(requests);
      const duration = Date.now() - startTime;

      const successCount = responses.filter((r) => r.ok).length;
      const actualRPS = (successCount / duration) * 1000;

      expect(actualRPS).toBeGreaterThan(requestsPerSecond * 0.9); // 90% of target RPS

      console.log(`Inquiry submission load test: ${successCount} requests in ${duration}ms (${actualRPS.toFixed(2)} RPS)`);
    });
  });

  describe('Database Load Tests', () => {
    it('should handle concurrent database queries', async () => {
      // Test concurrent Prisma queries
      const queries = Array.from({ length: concurrency }, async () => {
        // In production, use actual Prisma client
        // const offerings = await prisma.iruOffering.findMany({ take: 10 });
        return { count: 10 };
      });

      const startTime = Date.now();
      const results = await Promise.all(queries);
      const duration = Date.now() - startTime;

      expect(results.length).toBe(concurrency);
      expect(duration).toBeLessThan(5000); // < 5 seconds

      console.log(`Database load test: ${concurrency} concurrent queries in ${duration}ms`);
    });
  });

  describe('Stress Tests', () => {
    it('should handle resource exhaustion gracefully', async () => {
      // Create many concurrent requests to test resource limits
      const requests = Array.from({ length: concurrency * 10 }, () =>
        fetch(`${baseUrl}/api/v1/iru/marketplace/offerings`)
      );

      const responses = await Promise.allSettled(requests);
      const successCount = responses.filter((r) => r.status === 'fulfilled' && r.value.ok).length;
      const failureCount = responses.length - successCount;

      // System should handle most requests even under stress
      expect(successCount).toBeGreaterThan(concurrency * 5); // At least 50% success

      console.log(`Stress test: ${successCount} successful, ${failureCount} failed`);
    });
  });

  describe('Capacity Planning Tests', () => {
    it('should measure peak capacity', async () => {
      // Gradually increase load to find peak capacity
      const loadLevels = [10, 50, 100, 200, 500];
      const results: Array<{ load: number; successRate: number; avgResponseTime: number }> = [];

      for (const load of loadLevels) {
        const requests = Array.from({ length: load }, () =>
          fetch(`${baseUrl}/api/v1/iru/marketplace/offerings`)
        );

        const startTime = Date.now();
        const responses = await Promise.allSettled(requests);
        const duration = Date.now() - startTime;

        const successCount = responses.filter((r) => r.status === 'fulfilled' && r.value.ok).length;
        const successRate = (successCount / load) * 100;
        const avgResponseTime = duration / load;

        results.push({ load, successRate, avgResponseTime });

        console.log(`Capacity test at ${load} requests: ${successRate.toFixed(2)}% success, ${avgResponseTime.toFixed(2)}ms avg`);

        // Stop if success rate drops below 80%
        if (successRate < 80) {
          break;
        }
      }

      // Find peak capacity (last load level with >80% success)
      const peakCapacity = results.filter((r) => r.successRate >= 80).pop()?.load || 0;
      expect(peakCapacity).toBeGreaterThan(0);

      console.log(`Peak capacity: ${peakCapacity} concurrent requests`);
    });
  });
});
