modulejs.define('ext/thumbnails', ['_', 'core/settings', 'core/event', 'core/server'], function (_, allsettings, event, server) {

    var settings = _.extend({
            enabled: false,
            img: ['bmp', 'gif', 'ico', 'image', 'jpg', 'png'],
            mov: ['video'],
            doc: ['pdf', 'ps'],
            delay: 1000,
            size: 96
        }, allsettings.thumbnails),

        requestThumb = function (type, href, mode, ratio, callback) {

            server.request({
                action: 'getThumbHref',
                type: type,
                href: href,
                mode: mode,
                width: settings.size * ratio,
                height: settings.size
            }, function (json) {

                callback(json && json.code === 0 ? json.absHref : null);
            });
        },

        checkItem = function (item) {

            var type = null;

            if (_.contains(settings.img, item.type)) {
                type = 'img';
            } else if (_.contains(settings.mov, item.type)) {
                type = 'mov';
            } else if (_.contains(settings.doc, item.type)) {
                type = 'doc';
            }

            if (type) {
                if (item.thumbSquare) {
                    item.$view.find('.icon.square img').addClass('thumb').attr('src', item.thumbSquare);
                } else {
                    requestThumb(type, item.absHref, 'square', 1, function (src) {

                        if (src && item.$view) {
                            item.thumbSquare = src;
                            item.$view.find('.icon.square img').addClass('thumb').attr('src', src);
                        }
                    });
                }
                if (item.thumbRational) {
                    item.$view.find('.icon.rational img').addClass('thumb').attr('src', item.thumbRational);
                } else {
                    requestThumb(type, item.absHref, 'rational', 2, function (src) {

                        if (src && item.$view) {
                            item.thumbRational = src;
                            item.$view.find('.icon.rational img').addClass('thumb').attr('src', src);
                        }
                    });
                }
            }
        },

        onLocationChanged = function (item) {

            setTimeout(function () {

                _.each(item.content, checkItem);
            }, settings.delay);
        },

        onLocationRefreshed = function (item, added, removed) {

            _.each(added, checkItem);
        },

        init = function () {

            if (!settings.enabled || !server.api) {
                return;
            }

            event.sub('location.changed', onLocationChanged);
            event.sub('location.refreshed', onLocationRefreshed);
        };

    init();
});