import { Test, TestingModule } from "@nestjs/testing";
import { INestApplication, ValidationPipe } from "@nestjs/common";
import { AppModule } from "@/src/app.module";

const request = require("supertest");

/**
 * E2E Tests for MFA (Multi-Factor Authentication) Flow
 *
 * Prerequisites:
 * 1. Start test services: docker-compose -f test/docker-compose.yml up -d
 * 2. Run: pnpm test:e2e
 *
 * Tests cover:
 * - MFA status retrieval
 * - TOTP setup flow (secret + QR code generation)
 * - Email MFA setup
 * - MFA challenge during login
 * - Recovery code usage
 * - MFA disable flow (password-verified)
 * - Rate limiting on MFA endpoints
 */
describe("MFA Controller (e2e)", () => {
  let app: INestApplication;
  let sessionToken: string;

  const testUser = {
    email: `mfa-e2e-${Date.now()}@example.com`,
    username: `mfauser${Date.now()}`,
    password: "SecureMfaPass123!",
  };

  beforeAll(async () => {
    const moduleFixture: TestingModule = await Test.createTestingModule({
      imports: [AppModule],
    }).compile();

    app = moduleFixture.createNestApplication();
    app.useGlobalPipes(
      new ValidationPipe({
        whitelist: true,
        transform: true,
        forbidNonWhitelisted: true,
      }),
    );
    await app.init();

    // Register and login to get session token
    const registerRes = await request(app.getHttpServer())
      .post("/auth/register")
      .send(testUser);

    sessionToken = registerRes.body.sessionId;
  });

  afterAll(async () => {
    await app.close();
  });

  describe("GET /auth/mfa/status", () => {
    it("should return MFA status for authenticated user", () => {
      return request(app.getHttpServer())
        .get("/auth/mfa/status")
        .set("Authorization", `Bearer ${sessionToken}`)
        .expect(200)
        .expect((res) => {
          expect(res.body.enabled).toBe(false);
          expect(res.body.methods).toEqual([]);
          expect(res.body.totpEnabled).toBe(false);
          expect(res.body.emailEnabled).toBe(false);
          expect(res.body.recoveryCodesRemaining).toBeDefined();
        });
    });

    it("should reject unauthenticated requests", () => {
      return request(app.getHttpServer())
        .get("/auth/mfa/status")
        .expect(401);
    });
  });

  describe("POST /auth/mfa/setup/totp", () => {
    it("should return TOTP setup data with QR code", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/setup/totp")
        .set("Authorization", `Bearer ${sessionToken}`)
        .expect(200)
        .expect((res) => {
          expect(res.body.secret).toBeDefined();
          expect(res.body.secret.length).toBeGreaterThan(10);
          expect(res.body.otpauthUrl).toBeDefined();
          expect(res.body.otpauthUrl).toContain("otpauth://totp/");
          expect(res.body.qrCodeDataUrl).toBeDefined();
          expect(res.body.qrCodeDataUrl).toContain("data:image/png;base64,");
        });
    });

    it("should reject unauthenticated TOTP setup", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/setup/totp")
        .expect(401);
    });
  });

  describe("POST /auth/mfa/setup/email", () => {
    it("should enable email MFA for authenticated user", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/setup/email")
        .set("Authorization", `Bearer ${sessionToken}`)
        .expect(200)
        .expect((res) => {
          expect(res.body.success).toBe(true);
        });
    });

    it("should show email MFA enabled in status", async () => {
      const res = await request(app.getHttpServer())
        .get("/auth/mfa/status")
        .set("Authorization", `Bearer ${sessionToken}`)
        .expect(200);

      expect(res.body.emailEnabled).toBe(true);
      expect(res.body.enabled).toBe(true);
      expect(res.body.methods).toContain("email");
    });
  });

  describe("POST /auth/mfa/verify/totp", () => {
    it("should reject invalid TOTP code", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/verify/totp")
        .set("Authorization", `Bearer ${sessionToken}`)
        .send({ secret: "INVALIDSECRET", code: "000000" })
        .expect(400);
    });
  });

  describe("POST /auth/mfa/challenge", () => {
    it("should reject invalid pending session ID", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/challenge")
        .send({
          pendingSessionId: "nonexistent-session-id",
          method: "email",
          code: "123456",
        })
        .expect(401);
    });
  });

  describe("POST /auth/mfa/send-code", () => {
    it("should reject invalid pending session", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/send-code")
        .send({ pendingSessionId: "nonexistent-session-id" })
        .expect(401);
    });
  });

  describe("POST /auth/mfa/recovery", () => {
    it("should reject invalid pending session for recovery", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/recovery")
        .send({
          pendingSessionId: "nonexistent-session-id",
          recoveryCode: "ABCD1234",
        })
        .expect(401);
    });
  });

  describe("POST /auth/mfa/disable", () => {
    it("should reject disable without valid password", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/disable")
        .set("Authorization", `Bearer ${sessionToken}`)
        .send({ password: "WrongPassword123!", method: "email" })
        .expect(401);
    });

    it("should disable MFA method with correct password", () => {
      return request(app.getHttpServer())
        .post("/auth/mfa/disable")
        .set("Authorization", `Bearer ${sessionToken}`)
        .send({ password: testUser.password, method: "email" })
        .expect(200)
        .expect((res) => {
          expect(res.body.success).toBe(true);
        });
    });
  });

  describe("POST /auth/mfa/preferred", () => {
    it("should set preferred MFA method", async () => {
      // Re-enable email MFA first
      await request(app.getHttpServer())
        .post("/auth/mfa/setup/email")
        .set("Authorization", `Bearer ${sessionToken}`)
        .expect(200);

      return request(app.getHttpServer())
        .post("/auth/mfa/preferred")
        .set("Authorization", `Bearer ${sessionToken}`)
        .send({ method: "email" })
        .expect(200)
        .expect((res) => {
          expect(res.body.success).toBe(true);
        });
    });
  });

  describe("Full MFA Login Flow (with email MFA enabled)", () => {
    it("should require MFA challenge on login when MFA is enabled", async () => {
      const loginRes = await request(app.getHttpServer())
        .post("/auth/login")
        .send({
          email: testUser.email,
          password: testUser.password,
        })
        .expect(200);

      // When MFA is enabled, login returns pending session instead of full session
      if (loginRes.body.mfaRequired) {
        expect(loginRes.body.pendingSessionId).toBeDefined();
        expect(loginRes.body.availableMethods).toBeDefined();
        expect(loginRes.body.availableMethods).toContain("email");
        expect(loginRes.body.expiresAt).toBeDefined();
      }
    });
  });
});