/*global define */
'use strict';

define([
    'flight/lib/component',
    'app/store'
], function (defineComponent, dataStore) {
    function stats() {
        this.attributes({
            dataStore: dataStore
        });

        this.recount = function () {
            var todos = this.attr.dataStore.all();
            var all = todos.length;
            var remaining = todos.reduce(function (memo, each) {
                return memo += each.completed ? 0 : 1;
            }, 0);

            this.trigger('dataStatsCounted', {
                all: all,
                remaining: remaining,
                completed: all - remaining,
                filter: ''
            });
        };

        this.after('initialize', function () {
            this.on(document, 'dataTodosLoaded', this.recount);
            this.on(document, 'dataTodoAdded', this.recount);
            this.on(document, 'dataTodoRemoved', this.recount);
            this.on(document, 'dataTodoToggled', this.recount);
            this.on(document, 'dataClearedCompleted', this.recount);
            this.on(document, 'dataTodoToggledAll', this.recount);
        });
    }

    return defineComponent(stats);
});