// __tests__/unit/services/jwtService.test.js
const jwtService = require("../../../src/services/jwtService"); // Adjust path
const User = require("../../../src/models/User"); // Adjust path
const jwt = require("jsonwebtoken");

jest.mock("../../../src/models/User"); // Mock the User model

describe("JWT Service", () => {
	const mockUser = { id: 1, email: "test@example.com", role: "user" };
	const originalJwtSecret = process.env.JWT_SECRET;

	beforeAll(() => {
		process.env.JWT_SECRET = "test-secret-for-jwt-service"; // Use a fixed secret for tests
	});
	afterAll(() => {
		process.env.JWT_SECRET = originalJwtSecret; // Restore original
	});
	beforeEach(() => {
		User.saveSession.mockClear();
		User.isTokenBlacklisted.mockClear();
		User.revokeSession.mockClear();
	});

	describe("generateAccessToken", () => {
		it("should generate a valid access token and save session", async () => {
			User.saveSession.mockResolvedValue(true);
			const { token, expiresAt, jti } =
				jwtService.generateAccessToken(mockUser);

			expect(token).toBeDefined();
			expect(jti).toBeDefined();
			const decoded = jwt.verify(token, process.env.JWT_SECRET);
			expect(decoded.sub).toBe(mockUser.id);
			expect(decoded.type).toBe("access");
			expect(decoded.jti).toBe(jti);
			expect(User.saveSession).toHaveBeenCalledWith(
				mockUser.id,
				jti,
				expiresAt,
				undefined,
				undefined
			);
		});
	});

	describe("generateRefreshToken", () => {
		it("should generate a valid refresh token and save session", async () => {
			User.saveSession.mockResolvedValue(true);
			const { token } = jwtService.generateRefreshToken(mockUser);
			const decoded = jwt.verify(token, process.env.JWT_SECRET);
			expect(decoded.sub).toBe(mockUser.id);
			expect(decoded.type).toBe("refresh");
		});
	});

	describe("verifyToken", () => {
		it("should verify a valid token", () => {
			const { token } = jwtService.generateAccessToken(mockUser);
			const decoded = jwtService.verifyToken(token, "access");
			expect(decoded.sub).toBe(mockUser.id);
		});

		it("should throw error for an expired token", () => {
			// Generate token with 0s expiry (sign options need to be passed to jwt.sign)
			const expiredToken = jwt.sign(
				{ sub: mockUser.id, type: "access" },
				process.env.JWT_SECRET,
				{ expiresIn: "0s" }
			);
			// Wait a bit for it to actually expire
			return new Promise((resolve) => {
				setTimeout(() => {
					expect(() => jwtService.verifyToken(expiredToken, "access")).toThrow(
						"Token has expired"
					);
					resolve();
				}, 10);
			});
		});

		it("should throw error for an invalid token type", () => {
			const { token } = jwtService.generateAccessToken(mockUser); // This is an 'access' token
			expect(() => jwtService.verifyToken(token, "refresh")).toThrow(
				"Invalid token type. Expected refresh"
			);
		});
	});

	describe("refreshAccessToken", () => {
		it("should refresh access token with a valid refresh token", async () => {
			const { token: rToken, jti: refreshJti } =
				jwtService.generateRefreshToken(mockUser);
			User.isTokenBlacklisted.mockResolvedValue(false); // Not blacklisted
			User.findById.mockResolvedValue(mockUser); // User exists
			User.saveSession.mockResolvedValue(true); // For the new access token

			const { accessToken } = await jwtService.refreshAccessToken(rToken);
			expect(accessToken).toBeDefined();
			const decodedAccess = jwt.verify(accessToken, process.env.JWT_SECRET);
			expect(decodedAccess.type).toBe("access");
			expect(User.isTokenBlacklisted).toHaveBeenCalledWith(refreshJti);
		});

		it("should throw if refresh token is blacklisted", async () => {
			const { token: rToken, jti: refreshJti } =
				jwtService.generateRefreshToken(mockUser);
			User.isTokenBlacklisted.mockResolvedValue(true); // Blacklisted

			await expect(jwtService.refreshAccessToken(rToken)).rejects.toThrow(
				"Refresh token has been revoked"
			);
			expect(User.isTokenBlacklisted).toHaveBeenCalledWith(refreshJti);
		});
	});

	describe("revokeToken", () => {
		it("should call User.revokeSession with JTI", async () => {
			const { token, jti } = jwtService.generateAccessToken(mockUser);
			User.revokeSession.mockResolvedValue(true);

			await jwtService.revokeToken(token);
			expect(User.revokeSession).toHaveBeenCalledWith(jti);
		});
	});
	// ... more tests ...
});