$(document).ready(function(e) {
    var authorOptions = {
        placeholder: 'Authors',
        tags: true,
        ajax: {
            url: '/authors/search',
            dataType: 'json'
        }
    };

    var locationOptions = {
        placeholder: 'Location',
        tags: true
    };

    $('#add-form .select2-author').select2(authorOptions);

    $('#add-form .select2-location').select2(locationOptions);

    $('#add-form').on('keyup', '.barcode_input', function (e) {
        if (e.keyCode == 13) {
            // Do something
            e.preventDefault();

            var $row = $(this).closest('.form-row');

            $.get('/lookup/' + $(this).val(), function(res) {
                $row.find('input[name*=name]').val(res.title);

                var $authors = $row.find('.select2-author');

                for (var i = 0; i < res.authors.length; i++) {
                    $authors.append($('<option>', {value: res.authors[i], text: res.authors[i], selected: 'selected'}));
                }

                $authors.trigger('change');
            }, 'json');

            var count = emptyRowCount();

            console.log('Empty rows:', count);

            if (count < 1) {
                var $template = $('#add-template'),
                    $clone = $template.clone();

                $clone.find('input[type=text]').val('');

                $clone.removeClass('invisible').addClass('form-row');

                $row.parent().append($clone);

                $clone.find('.barcode_input').focus();
                $clone.find('.select2-author').select2(authorOptions);
            }
        }
    });
});

function emptyRowCount() {
    var $barcodes = $('#add-form .barcode_input');

    var count = 0;

    $barcodes.each(function() {
        if ($(this).val() == '') {
            count++;
        }
    });

    return count;
}