/* global __ */

if (typeof KOHA == "undefined" || !KOHA) {
    var KOHA = {};
}

/**
 * A namespace for local cover related functions.
 */
KOHA.LocalCover = {


    /**
     * Search all:
     *    <div title="biblionumber" id="isbn" class="openlibrary-thumbnail"></div>
     * or
     *    <div title="biblionumber" id="isbn" class="openlibrary-thumbnail-preview"></div>
     * and run a search with all collected isbns to Open Library Book Search.
     * The result is asynchronously returned by OpenLibrary and catched by
     * olCallBack().
     */
    GetCoverFromBibnumber: function(uselink) {
        var mydiv = $("#local-thumbnail-preview");
        var biblionumber = mydiv.data("biblionumber");
        var img = document.createElement("img");
        img.src = "/cgi-bin/koha/catalogue/image.pl?thumbnail=1&biblionumber=" + biblionumber;
        img.onload = function() {
            // image dimensions can't be known until image has loaded
            if ( (img.complete != null) && (!img.complete) ) {
                mydiv.remove();
            }
        };
        if (uselink) {
            var a = $("<a />").attr('href', '/cgi-bin/koha/catalogue/imageviewer.pl?biblionumber=' + $(mydiv).attr("class"));
            $(a).append(img);
            mydiv.append(a);
        } else {
            mydiv.append(img);
        }
    },
    LoadResultsCovers: function(){
        $("div [id^=local-thumbnail]").each(function(i) {
            var mydiv = this;
            var message = document.createElement("span");
            $(message).attr("class","no-image thumbnail");
            $(message).html( __("No cover image available") );
            $(mydiv).append(message);
            var img = $("<img />");
            img.attr('src','/cgi-bin/koha/catalogue/image.pl?thumbnail=1&biblionumber=' + $(mydiv).attr("class"))
                .addClass("thumbnail")
                .load(function () {
                    if (!this.complete || typeof this.naturalWidth == "undefined" || this.naturalWidth <= 1) {
                        //IE HACK
                        try {
                            var otherCovers = $(mydiv).closest('td').find('img');
                            var nbCovers = otherCovers.length;
                            if(nbCovers > 0){
                                var badCovers = 0;
                                otherCovers.each(function(){
                                    if(this.naturalWidth <= 1){
                                        $(this).parent().remove();
                                        badCovers++;
                                    }
                                });
                                if(badCovers < nbCovers){
                                    $(mydiv).parent().remove();
                                }
                            }
                        }
                        catch(err){
                        }
                    } else {
                        $(mydiv).append(img);
                        $(mydiv).children('.no-image').remove();
                    }
                });
        });
    }
};