(function($) {
    $.fn.PluginManager = function() {

        var complete;
        var items_completed = 0;
        var current_item = '';
        var $current_node;
        var current_item_hash = '';

        function ajax_callback(response) {

            if (typeof response == 'object' && typeof response.message != 'undefined') {
                if (response.message === 'Success') {
                    $current_node.find('span').first().addClass('green');
                    $current_node.find('.checkmark').first().addClass('green');
                }
                $current_node.find('span').first().text(response.message);
                $current_node.find('.loader').addClass('loading');
                if (typeof response.url != 'undefined') {
                    // we have an ajax url action to perform.

                    if (response.hash == current_item_hash) {
                        $current_node.find('span').text("failed");
                        find_next();
                    } else {
                        current_item_hash = response.hash;
                        jQuery.post(response.url, response, function(response2) {
                            process_current();

                            $current_node.find('span').first().text(response.message + envato_setup_params.verify_text);
                        }).fail(ajax_callback);
                    }

                } else if (typeof response.done != 'undefined') {
                    // finished processing this plugin, move onto next
                    find_next();
                } else {
                    // error processing this plugin
                    find_next();
                }
            } else {
                // error - try again with next plugin
                $current_node.find('span').text("ajax error");
                find_next();
            }
        }

        function process_current() {
            if (current_item) {
                // query our ajax handler to get the ajax to send to TGM
                // if we don't get a reply we can assume everything worked and continue onto the next one.
                jQuery.post(envato_setup_params.ajaxurl, {
                    action: 'bs_handle_plugins',
                    wpnonce: envato_setup_params.wpnonce,
                    slug: current_item
                }, function(e) {
                    ajax_callback(e);

                }).fail(ajax_callback);
            }
        }

        function find_next() {
            var do_next = false;
            if ($current_node) {
                if (!$current_node.data('done_item')) {
                    items_completed++;
                    $current_node.data('done_item', 1);
                }
                $current_node.addClass('done');
            }
            var $li = $('.envato-wizard-plugins li');
            $li.each(function() {
                if (current_item == '' || do_next) {
                    current_item = $(this).data('slug');
                    $current_node = $(this);
                    process_current();
                    do_next = false;
                } else if ($(this).data('slug') == current_item) {
                    do_next = true;
                }
            });
            if (items_completed >= $li.length) {
                // finished all plugins!
                complete();
            }
        }

        return {
            init: function(beforestart,callback) {
                $('#setup-next').addClass('disabled');
                $('#setup-back').addClass('disabled');
                $('.envato-wizard-plugins').addClass('installing');
                complete = function() {
                    $('#setup-next').removeClass('disabled');
                    $('#setup-back').removeClass('disabled');
                    $('.envato-wizard-plugins').removeClass('installing');
                    callback();
                };
                find_next();
            }
        }
    }
})(jQuery);