const crypto = require("crypto");
const jwt = require("jsonwebtoken");
const mockVerifyIdToken = jest.fn();
jest.mock("google-auth-library", () => ({ OAuth2Client: jest.fn(() => ({ verifyIdToken: mockVerifyIdToken })) }));
const { verifyGoogleToken, verifyAppleToken } = require("../../app/services/auth/oauth.service");

describe("OAuth verifier adapters", () => {
  test("uses Google's verified stable subject", async () => {
    process.env.GOOGLE_CLIENT_ID = "google-client";
    mockVerifyIdToken.mockResolvedValue({ getPayload: () => ({ sub: "google-subject", email: "USER@EXAMPLE.COM", email_verified: true, given_name: "Test", family_name: "User" }) });
    await expect(verifyGoogleToken("signed-google-id-token")).resolves.toMatchObject({ subject: "google-subject", email: "user@example.com", emailVerified: true });
  });

  test("verifies Apple signature, issuer, audience and subject using JWKS", async () => {
    process.env.APPLE_CLIENT_ID = "apple-client";
    const { privateKey, publicKey } = crypto.generateKeyPairSync("rsa", { modulusLength: 2048 });
    const jwk = publicKey.export({ format: "jwk" }); Object.assign(jwk, { kid: "test-key", alg: "RS256", use: "sig" });
    global.fetch = jest.fn().mockResolvedValue({ ok: true, json: async () => ({ keys: [jwk] }) });
    const token = jwt.sign({ email: "apple@example.com", email_verified: "true" }, privateKey, { algorithm: "RS256", keyid: "test-key", subject: "apple-subject", issuer: "https://appleid.apple.com", audience: "apple-client", expiresIn: "5m" });
    await expect(verifyAppleToken(token)).resolves.toMatchObject({ subject: "apple-subject", emailVerified: true });
  });
});