jQuery(function ($) {
    "use strict";

    /**
     * Reset the message.
     */
    function resetMessage () {
        $("#result")
        .removeClass()
        .text("");
    }
    /**
     * show a successful message.
     * @param {String} text the text to show.
     */
    function showMessage(text) {
        resetMessage();
        $("#result")
        .addClass("alert alert-success")
        .text(text);
    }
    /**
     * show an error message.
     * @param {String} text the text to show.
     */
    function showError(text) {
        resetMessage();
        $("#result")
        .addClass("alert alert-danger")
        .text(text);
    }

    /**
     * Fetch the content, add it to the JSZip object
     * and use a jQuery deferred to hold the result.
     * @param {String} url the url of the content to fetch.
     * @param {String} filename the filename to use in the JSZip object.
     * @param {JSZip} zip the JSZip instance.
     * @return {jQuery.Deferred} the deferred containing the data.
     */
    function deferredAddZip(url, filename, zip) {
        var deferred = $.Deferred();
        JSZipUtils.getBinaryContent(url, function (err, data) {
            if(err) {
                deferred.reject(err);
            } else {
                zip.file(filename, data, {binary:true});
                deferred.resolve(data);
            }
        });
        return deferred;
    }

	$('.btn-primary').on('click', function(){
		  var form = $(this).parents('form:first');
	      $('#'+form[0].id).data('button', this.attributes[2].value);
	});

    var $form = $(".download_form").on("click", function () {
        var zip = new JSZip();
        var deferreds = [];
        var tabTitle = this.attributes["tab-name"];
        var docFormat = this.text;

        if(docFormat == "submit")
        	docFormat = event.originalEvent.explicitOriginalTarget.attributes["doc-format"].value;

        // find every checked item
        $.each(files_array[tabTitle.nodeValue], function (index, nodeName) {
            	var url = urldir + "/" + nodeName;            	
            	if(docFormat != "both"){
                    if(docFormat == "pdf" || (docFormat == "xls") )
            		{ 
                        deferreds.push(deferredAddZip(url + "." + docFormat, nodeName + "." + docFormat, zip));   
                    }
                }
            	else
            	{
                    deferreds.push(deferredAddZip(url + ".pdf", nodeName + ".pdf", zip)); 
            	}      		  
        });
        

        // when everything has been downloaded, we can trigger the dl
        $.when.apply($, deferreds).done(function () {
            var blob = zip.generate({type:"blob"});

            // see FileSaver.js
            var FileSaveName = "PIRLS-2016.zip";
            var FolderSitePath = $(location).attr('href').split("/");
            if(FolderSitePath[FolderSitePath.length - 4]  == "epirls")
            	FileSaveName = "ePIRLS-2016.zip";
            if(blob.size > 30) 
            	saveAs(blob, FileSaveName);
            else
            	showMessage("You must select at least 1 file to download");
        }).fail(function (err) {
            showError(err);
        });
        return false;
        
    });
});

// vim: set shiftwidth=4 softtabstop=4: