function Impress(page) {
    this.page = page;
}

Impress.prototype = {

    getName: function () {
        return "Impress JS";
    },

    isActive: function () {
        return this.page.evaluate(function () {
            if (typeof impress === "function")
                return true;

            if (document.getElementById("impress"))
                console.log("Impress JS plugin isn't compatible with impress.js version < 0.3.0");

            return false;
        });
    },

    slideCount: function () {
        return this.page.evaluate(function () {
            return document.querySelectorAll("#impress .step, #impress .substep").length;
        });
    },

    nextSlide: function () {
        this.page.evaluate(function () {
            impress().next();
        });
    },

    currentSlideIndex: function () {
        return this.page.evaluate(function () {
            return window.location.hash.replace(/^#\/?/, "");
        });
    }
};

exports.create = function (page) {
    return new Impress(page);
};