import { beforeEach, describe, expect, it } from 'bun:test';
import { checkRateLimit, cleanupRateLimitCache, clearRateLimitCache } from '../src/utils/rateLimit';

describe('Rate Limiter', () => {
  beforeEach(() => {
    clearRateLimitCache();
  });

  it('should allow requests up to the configured limit then block', () => {
    const key = 'user-1';

    // Default config maxRequests is 30; all 20 should pass
    for (let i = 0; i < 20; i++) {
      expect(checkRateLimit(key)).toBe(true);
    }
  });

  it('should block requests when limit exceeded', () => {
    const key = 'user-2';

    // Exhaust the limit (30 by default)
    for (let i = 0; i < 30; i++) {
      checkRateLimit(key);
    }

    expect(checkRateLimit(key)).toBe(false);
  });

  it('should reset window after cleanup on expired entries', async () => {
    const key = 'user-3';

    // Use one request then wait past the window
    expect(checkRateLimit(key)).toBe(true);

    // Simulate expiry by advancing past the window
    // We can only test cleanup of non-expired entries (no-op)
    expect(() => cleanupRateLimitCache()).not.toThrow();
  });

  it('should track different IPs independently', () => {
    expect(checkRateLimit('10.0.0.1')).toBe(true);
    expect(checkRateLimit('10.0.0.1')).toBe(true);
    expect(checkRateLimit('10.0.0.2')).toBe(true);
  });
});