(function($) {
    jQuery.fn.barcode_reader = function(options, callback) {

        // -----------
        // Set options
        // -----------
        var defaults = {
            delay:      1200,   // how long to keep messages on screen
            trans:      250,    // fade transition
            trigger:    17,     // Ctrl key
            message_standby:        "Press the 'Ctrl' key to scan or manually enter barcodes.",
            message_ready:          "Ready for barcode...",
            message_match:          "Match found.",
            message_nomatch:        "Unrecognized barcode.",
            message_nomatch_verb:   "This barcode was not found in the company library."
        }

        var o =  $.extend(defaults, options);

        // ----------
        // Initialize
        // ----------
        var dummy =
            "<div style=\"visibility: hidden; height: 0; width: 0; overflow: hidden;\">" +
            "   <form id=\"barcode_scanner_form\">" +
            "   <input type=\"text\" name=\"barcode_scanner_input\" id=\"barcode_scanner_input\" maxlength=\"30\" />" +
            "   </form>" +
            "</div>" +
            "<div id=\"barcode_reader_result\" style=\"heigh:14px;\"></div>";


        var container = $(this);

        container.prepend(dummy);

        var form    = $("#barcode_scanner_form");
        var field   = $("#barcode_scanner_input");
        var status  = $("#barcode_reader_result");



        // ---------------
        // Info box states
        // ---------------
        function info_standby() {
            status.fadeOut(o.trans, function(){
                status.removeClass()
                    .addClass('info_box info_box_fyi')
                    .text(o.message_standby)
                    .fadeIn(o.trans);
            });

        }

        function info_ready(delay) {
            setTimeout( function(){
                status.fadeOut(o.trans, function() {
                    status.removeClass()
                        .addClass('info_box info_box_barcode')
                        .text(o.message_ready)
                        .fadeIn(o.trans);
                });
            }, delay);
        }

        function info_success() {
            status.fadeOut(o.trans, function(){
                status.removeClass()
                    .addClass('info_box info_box_success')
                    .text(o.message_match)
                    .fadeIn(o.trans);
            });
        }

        function info_warning() {
            status.fadeOut(o.trans, function(){
                status.removeClass()
                    .addClass('info_box info_box_warning')
                    .text(o.message_nomatch)
                    .fadeIn(o.trans);
            });
        }

        info_standby();

        field.blur(function(){ info_standby(); });
        field.keyup(function(){
            if (field.val()) {
                status.text('BARCODE: ' + field.val());
            }
        });

        // ---------
        // Trigger
        // ---------
        $(document).keydown(function(e) {
            if (e.which == o.trigger) {
                field.val("").focus();
                info_ready(0);
            }
        });

        // -------------
        // Process input
        // -------------
        form.submit(function() {
            var barcode = field.val();
            field.val("").focus();

            // compare input with array of valid barcodes
            var match   = 0;
            if ( $.inArray(barcode, o.valid) != -1 )    { match = 1; }

            if (match){
                info_success();
                info_ready(o.delay);
            } else {
                info_warning();
                info_ready(o.delay);
                $.jGrowl('<b>' + barcode + '</b> - ' + o.message_nomatch_verb,
                    { life: 5000, theme:    'error' }
                );
            }

            if ( typeof(callback) == "function" )   { callback(barcode, match); }
            return false;
        });
    }
})(jQuery);