import jwtDecode from "jwt-decode";

/**
 * The active JWT
 */
 let token: string | null;

/**
 * The decoded user object
 */
let user: {
	id: number,
	name: string,
	isAdmin: boolean
} | null;

/**
 * Check if the user is an admin
 */
export function isAdmin() {
	return user && user.isAdmin;
}

/**
 * Check if the client is authenticated
 */
export function isAuthenticated() {
	return Boolean(token);
}

/**
 * Load the token from local storage
 */
export function loadToken() {
	try {
		token = localStorage.getItem("jwt");
		user = jwtDecode(<string>token);
	} catch(e) {
		console.log("Failed to load token");
		token = null;
		user = null;
		return false;
	}
	return true;
}

/**
 * Delete the token from local storage
 */
export function forgetToken() {
	token = null;
	user = null;
	localStorage.removeItem("jwt");
}

/**
 * Store a JWT token in local storage
 */
export function storeToken(jwtToken: string) {
	try {
		user = jwtDecode(jwtToken);
		token = jwtToken;
		localStorage.setItem("jwt", jwtToken);
	} catch(e) {
		user = null;
		token = null;
		return false;
	}
	return true;
}