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RJSDemoApp = {};


RJSDemoApp.getInputValue = function (inputId) {
    return $("#" + inputId).val();
};

RJSDemoApp.setModuleContainerHeight = function () {
    $("#epub-reader-container").css({ "height" : $(window).height() * 0.85 + "px" });
};

RJSDemoApp.addLibraryList = function ($ulElementContainer, libraryJson) {

    _.each(libraryJson.library_epubs, function (currEpub) {

        var $currLi = $('<li><a id="' + currEpub.url_to_package_doc + '" href="#">' + currEpub.title + '</a></li>');
        $currLi.on("click", function () {
            RJSDemoApp.loadAndRenderEpub(currEpub.url_to_package_doc);
        });
        $ulElementContainer.append($currLi);
    });
};

// This function will retrieve a package document and load an EPUB
RJSDemoApp.loadAndRenderEpub = function (packageDocumentURL) {

    // Set a fixed height for the epub viewer container
    RJSDemoApp.setModuleContainerHeight();

    var that = this;
    var jsLibDir = './lib/';
    var elementToBindReaderTo = $("#epub-reader-container");
    $(elementToBindReaderTo).html("");

    // Clear the viewer, if it has been defined -> to load a new epub
    RJSDemoApp.epubViewer = undefined;

    RJSDemoApp.readium = new Readium(elementToBindReaderTo, packageDocumentURL, jsLibDir, function (epubViewer) {
        RJSDemoApp.epubViewer = epubViewer;
        RJSDemoApp.epubViewer.openBook();
        // Change layout stuff
        RJSDemoApp.epubViewer.updateSettings({ "columnGap" : 20});
    });


    // These are application specific handlers that wire the HTML to the SimpleReadiumJs module API

    // Set handlers for click events
    $("#previous-page-btn").unbind("click");
    $("#previous-page-btn").on("click", function () {
        RJSDemoApp.epubViewer.openPageLeft();
    });

    $("#next-page-btn").unbind("click");
    $("#next-page-btn").on("click", function () {
        RJSDemoApp.epubViewer.openPageRight();
    });

    $("#toggle-synthetic-btn").unbind("click");
    $("#toggle-synthetic-btn").on("click", function () {

        if (RJSDemoApp.currLayoutIsSynthetic) {
            RJSDemoApp.epubViewer.updateSettings({ "isSyntheticSpread" : false });
            RJSDemoApp.currLayoutIsSynthetic = false;
            $("#toggle-synthetic-btn").removeClass('synthetic-page-ico');
            $("#toggle-synthetic-btn").addClass('single-page-ico');
        }
        else {
            RJSDemoApp.epubViewer.updateSettings({ "isSyntheticSpread" : true });
            RJSDemoApp.currLayoutIsSynthetic = true;
            $("#toggle-synthetic-btn").removeClass('single-page-ico');
            $("#toggle-synthetic-btn").addClass('synthetic-page-ico');
        }
    });
};

// When the document is ready, choose an EPUB to show.
$(document).ready(function () {

    RJSDemoApp.currLayoutIsSynthetic = true;

    // "epub_content/moby_dick/OPS/package.opf"

    // Load Moby Dick by default
    RJSDemoApp.loadAndRenderEpub("epub_content/page-blanche/EPUB/package.opf");

    // Generate the library
    $.getJSON('epub_content/epub_library.json', function (data) {

        $(".show-on-load").hide();
        $("#library-list").html("");
        RJSDemoApp.addLibraryList($("#library-list"), data);
        $(".show-on-load").show();

    }).fail(function (result) {
        console.log("The library could not be loaded");
    });
});