import Mmenu from '../../core/oncanvas/mmenu.oncanvas';
import options from './_options';
import { extendShorthandOptions } from './_options';
import * as DOM from '../../_modules/dom';
import { extend } from '../../_modules/helpers';

//	Add the options.
Mmenu.options.backButton = options;

export default function(this: Mmenu) {
    if (!this.opts.offCanvas) {
        return;
    }

    var options = extendShorthandOptions(this.opts.backButton);
    this.opts.backButton = extend(options, Mmenu.options.backButton);

    var _menu = '#' + this.node.menu.id;

    //	Close menu
    if (options.close) {
        var states = [];

        const setStates = () => {
            states = [_menu];
            DOM.children(
                this.node.pnls,
                '.mm-panel_opened, .mm-panel_opened-parent'
            ).forEach(panel => {
                states.push('#' + panel.id);
            });
        };

        this.bind('open:finish', () => {
            history.pushState(null, document.title, _menu);
        });
        this.bind('open:finish', setStates);
        this.bind('openPanel:finish', setStates);
        this.bind('close:finish', () => {
            states = [];
            history.back();
            history.pushState(
                null,
                document.title,
                location.pathname + location.search
            );
        });

        window.addEventListener('popstate', evnt => {
            if (this.vars.opened) {
                if (states.length) {
                    states = states.slice(0, -1);
                    var hash = states[states.length - 1];

                    if (hash == _menu) {
                        this.close();
                    } else {
                        this.openPanel(this.node.menu.querySelector(hash));
                        history.pushState(null, document.title, _menu);
                    }
                }
            }
        });
    }

    if (options.open) {
        window.addEventListener('popstate', evnt => {
            if (!this.vars.opened && location.hash == _menu) {
                this.open();
            }
        });
    }
}