import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";

// Test express-rate-limit v8 upgrade compatibility
describe("express-rate-limit v8 upgrade", () => {
  it("should export rateLimit as default export", async () => {
    const mod = await import("express-rate-limit");
    expect(typeof mod.default).toBe("function");
  });

  it("should export ipKeyGenerator helper (v8 feature)", async () => {
    const mod = await import("express-rate-limit");
    // v8 exports ipKeyGenerator for IPv6 subnet masking
    expect(typeof (mod as any).ipKeyGenerator).toBe("function");
  });

  it("ipKeyGenerator should return IPv4 addresses unchanged", async () => {
    const { ipKeyGenerator } = await import("express-rate-limit") as any;
    const result = ipKeyGenerator("192.168.1.1");
    expect(result).toBe("192.168.1.1");
  });

  it("ipKeyGenerator should mask IPv6 addresses to /56 by default", async () => {
    const { ipKeyGenerator } = await import("express-rate-limit") as any;
    const ip1 = ipKeyGenerator("2001:db8:85a3:1234:1111:2222:3333:4444");
    const ip2 = ipKeyGenerator("2001:db8:85a3:1256:aaaa:bbbb:cccc:dddd");
    // Same /56 prefix → same result
    expect(ip1).toBe(ip2);
  });

  it("rateLimit should accept standardHeaders: true", async () => {
    const { default: rateLimit } = await import("express-rate-limit");
    // Should not throw
    const limiter = rateLimit({
      windowMs: 60000,
      max: 100,
      standardHeaders: true,
      legacyHeaders: false,
    });
    expect(typeof limiter).toBe("function");
  });
});