import _ from 'underscore';
import Backbone from 'backbone';

const windowEventList = [
    {
        name: 'click',
        capture: true
    },
    {
        name: 'keydown',
        capture: true
    },
    {
        name: 'keydown',
        capture: false
    },
    {
        name: 'mousedown',
        capture: true
    },
    {
        name: 'mouseup',
        capture: true
    },
    {
        name: 'resize',
        capture: false
    },
    {
        name: 'load',
        capture: false
    }
];

const globalEventService = /** @lends module:core.services.GlobalEventService */ {
    initialize() {
        this.__windowEvents = windowEventList.map(x => {
            const captureSuffix = x.capture ? ':captured' : '';
            const eventName = `window:${x.name}${captureSuffix}`;
            return {
                name: x.name,
                capture: x.capture,
                handler: e => {
                    // what for pass 2 argument, if first is nested in the second ?
                    this.trigger(eventName, e.target, e);
                }
            };
        });
        this.__windowEvents.forEach(x => {
            window.addEventListener(x.name, x.handler, x.capture);
        });
        this.listenTo(this, 'window:load', () => (this.pageLoaded = true));
    },

    onDestroy() {
        this.__windowEvents.forEach(x => {
            window.removeEventListener(x.name, x.handler, x.capture);
        });
    }
};

_.extend(globalEventService, Backbone.Events);

export default globalEventService;