define(['jquery', 'backbone', 'underscore', 'app', 'models/TreeCollection',
    'views/packageView', 'views/fileView', 'views/selectionView', 'views/filterView', 'select2'],
    function($, Backbone, _, App, TreeCollection, packageView, fileView, selectionView, filterView) {

        // Renders whole dashboard
        return Backbone.View.extend({

            el: '#content',
            active: $('.breadcrumb .active'),

            events: {
            },

            // <ul> holding the packages
            packageUL: null,
            // <ul> displaying the files
            fileUL: null,
            // Package tree
            tree: null,
            // Current open files
            files: null,
            // True when loading animation is running
            isLoading: false,

            initialize: function() {
                var self = this;
                this.tree = new TreeCollection();

                var view = new selectionView();
                view = new filterView();

                // When package is added we reload the data
                App.vent.on('package:added', function() {
                    console.log('Package tree caught, package:added event');
                    self.tree.fetch();
                });

                App.vent.on('file:updated', _.bind(this.fileUpdated, this));

                // TODO: file:added
                // TODO: package:deleted
                // TODO: package:updated
            },

            init: function() {
                var self = this;
                // TODO: put in separated function
                // TODO: order of elements?
                // Init the tree and callback for package added
                this.tree.fetch({success: function() {
                    self.render();
                    self.tree.get('packages').on('add', function(pack) {
                        console.log('Package ' + pack.get('pid') + ' added to tree');
                        self.appendPackage(pack, 0, true);
                        self.openPackage(pack);
                    });
                }});

                this.$('.input').select2({tags: ["a", "b", "sdf"]});
            },

            render: function() {
                console.log('Render package list');
                var packs = this.tree.get('packages');
                this.files = this.tree.get('files');

                this.packageUL = this.$('.package-list');
                packs.each(_.bind(this.appendPackage, this));

                this.fileUL = this.$('.file-list');
                if (this.files.length === 0) {
                    // no files are displayed
                    this.files = null;
                    // Open the first package
                    if (packs.length >= 1)
                        this.openPackage(packs.at(0));
                }
                else
                    this.files.each(_.bind(this.appendFile, this));

                return this;
            },

            // TODO sorting ?!
            // Append a package to the list, index, animate it
            appendPackage: function(pack, i, animation) {
                var el = new packageView({model: pack}).render().el;
                this.packageUL.appendWithAnimation(el, animation);
            },

            appendFile: function(file, i, animation) {
                var el = new fileView({model: file}).render().el;
                this.fileUL.appendWithAnimation(el, animation);
            },

            // Show content of the packages on main view
            openPackage: function(pack) {
                var self = this;

                // load animation only when something is shown and its different from current package
                if (this.files && this.files !== pack.get('files'))
                    self.loading();

                pack.fetch({silent: true, success: function() {
                    console.log('Package ' + pack.get('pid') + ' loaded');
                    self.active.text(pack.get('name'));
                    self.contentReady(pack.get('files'));
                }, failure: function() {
                    self.failure();
                }});

            },

            contentReady: function(files) {
                var old_files = this.files;
                this.files = files;
                App.vent.trigger('dashboard:contentReady');

                // show the files when no loading animation is running and not already open
                if (!this.isLoading && old_files !== files)
                    this.show();
            },

            // Do load animation, remove the old stuff
            loading: function() {
                this.isLoading = true;
                this.files = null;
                var self = this;
                this.fileUL.fadeOut({complete: function() {
                    // All file views should vanish
                    App.vent.trigger('dashboard:destroyContent');

                    // Loading was faster than animation
                    if (self.files)
                        self.show();

                    self.isLoading = false;
                }});
            },

            failure: function() {
                // TODO
            },

            show: function() {
                // fileUL has to be resetted before
                this.files.each(_.bind(this.appendFile, this));
                //TODO: show placeholder when nothing is displayed (filtered content empty)
                this.fileUL.fadeIn();
                App.vent.trigger('dashboard:updated');
            },

            // Refresh the file if it is currently shown
            fileUpdated: function(data) {
                // this works with ids and object
                var file = this.files.get(data);
                if (file)
                    if (_.isObject(data)) // update directly
                        file.set(data);
                    else // fetch from server
                        file.fetch();
            }
        });
    });