var jwt = (function (log, storage) {

    var TOKEN = 'auth_token';
    var EXPIRATION = 'auth_expiration';

    var get = function () {

        log.debug({ class: 'jwt', method: 'get' });


        var token = storage.get(TOKEN);
        var expiration = storage.get(EXPIRATION);

        return {
            token: token,
            expiration: expiration
        };
    };

    var set = function (auth) {

        log.debug({ class: 'jwt', method: 'set', token: auth });

        storage.set(TOKEN, auth.token);
        storage.set(EXPIRATION, auth.expiration);

    };

    var clear = function () {

        log.debug({ class: 'jwt', method: 'clear' });

        storage.remove(TOKEN);
        storage.remove(EXPIRATION);

    };

    var intercept = function () {

        $.ajaxSetup({
            beforeSend: function (xhr) {
                var auth = get();
                xhr.setRequestHeader('Authorization', auth.token);
            }
        });
    };

    var isExpired = function () {

        var auth = get();
        var expiration = new Date(auth.expiration);
        var current = new Date();

        return expiration >= current;

    };

    var isAuthenticated = function () {

        var auth = get();

        return (auth !== undefined && auth !== null);

    };

    return {
        get: get,
        set: set,
        clear: clear,
        intercept: intercept,
        isExpired: isExpired,
        isAuthenticated: isAuthenticated
    };

})(log, storage);