import { describe, it, expect } from "vitest";

/**
 * CORS Configuration Tests
 *
 * These tests verify that CORS is configured correctly for cookie-based authentication.
 *
 * CRITICAL REQUIREMENTS:
 * - credentials: true (allows cookies to be sent)
 * - origin: must be specific origins, NOT wildcard (security requirement with credentials)
 * - Access-Control-Allow-Credentials: true header
 * - Access-Control-Allow-Origin: specific origin (not *)
 */

describe("CORS Configuration", () => {
  describe("Configuration requirements", () => {
    it("should document required CORS settings for cookie-based auth", () => {
      // This test documents the requirements
      const requiredSettings = {
        origin: ["http://localhost:3000", "https://app.mosaicstack.dev"],
        credentials: true,
        allowedHeaders: ["Content-Type", "Authorization", "Cookie"],
        exposedHeaders: ["Set-Cookie"],
        methods: ["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"],
      };

      expect(requiredSettings.credentials).toBe(true);
      expect(requiredSettings.origin).not.toContain("*");
      expect(requiredSettings.allowedHeaders).toContain("Cookie");
    });

    it("should NOT use wildcard origin with credentials (security violation)", () => {
      // Wildcard origin with credentials is a security violation
      // This test ensures we never use that combination
      const validConfig1 = { origin: "*", credentials: false };
      const validConfig2 = { origin: "http://localhost:3000", credentials: true };
      const invalidConfig = { origin: "*", credentials: true };

      // Valid configs
      expect(validConfig1.origin === "*" && !validConfig1.credentials).toBe(true);
      expect(validConfig2.origin !== "*" && validConfig2.credentials).toBe(true);

      // Invalid config check - this combination should NOT be allowed
      const isInvalidCombination = invalidConfig.origin === "*" && invalidConfig.credentials;
      expect(isInvalidCombination).toBe(true); // This IS an invalid combination
      // We will prevent this in our CORS config
    });
  });

  describe("Origin validation", () => {
    it("should define allowed origins list", () => {
      const allowedOrigins = [
        process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000",
        "http://localhost:3001", // API origin (dev)
        "https://app.mosaicstack.dev", // Production web
        "https://api.mosaicstack.dev", // Production API
      ];

      expect(allowedOrigins).toHaveLength(4);
      expect(allowedOrigins).toContain("http://localhost:3000");
      expect(allowedOrigins).toContain("https://app.mosaicstack.dev");
    });

    it("should match exact origins, not partial matches", () => {
      const origin = "http://localhost:3000";
      const maliciousOrigin = "http://localhost:3000.evil.com";

      expect(origin).toBe("http://localhost:3000");
      expect(maliciousOrigin).not.toBe(origin);
    });

    it("should support dynamic origin from environment variable", () => {
      const defaultOrigin = "http://localhost:3000";
      const envOrigin = process.env.NEXT_PUBLIC_APP_URL ?? defaultOrigin;

      expect(envOrigin).toBeDefined();
      expect(typeof envOrigin).toBe("string");
    });
  });
});