'use strict';

const api = require('../api.js');
const topNavigation = require('../models/top_navigation.js');
const TopNavigationView = require('../views/top_navigation_view.js');

class TopNavigationController {
    constructor() {
        this._topNavigationView = new TopNavigationView();

        topNavigation.addEventListener(
            'activate', e => this._evtActivate(e));

        api.addEventListener('login', e => this._evtAuthChange(e));
        api.addEventListener('logout', e => this._evtAuthChange(e));

        this._render();
    }

    _evtAuthChange(e) {
        this._render();
    }

    _evtActivate(e) {
        this._topNavigationView.activate(e.detail.key);
    }

    _updateNavigationFromPrivileges() {
        topNavigation.get('account').url = '/user/' + api.userName;
        topNavigation.get('account').imageUrl =
            api.user ? api.user.avatarUrl : null;

        topNavigation.showAll();
        if (!api.hasPrivilege('posts:list')) {
            topNavigation.hide('posts');
        }
        if (!api.hasPrivilege('posts:create')) {
            topNavigation.hide('upload');
        }
        if (!api.hasPrivilege('comments:list')) {
            topNavigation.hide('comments');
        }
        if (!api.hasPrivilege('tags:list')) {
            topNavigation.hide('tags');
        }
        if (!api.hasPrivilege('users:list')) {
            topNavigation.hide('users');
        }
        if (api.isLoggedIn()) {
            topNavigation.hide('register');
            topNavigation.hide('login');
        } else {
            if (!api.hasPrivilege('users:create')) {
                topNavigation.hide('register');
            }
            topNavigation.hide('account');
            topNavigation.hide('logout');
        }
    }

    _render() {
        this._updateNavigationFromPrivileges();
        this._topNavigationView.render({
            items: topNavigation.getAll(),
        });
        this._topNavigationView.activate(
            topNavigation.activeItem ? topNavigation.activeItem.key : '');
    }
}

module.exports = new TopNavigationController();