import {Component} from '@angular/core';
// 路由
import {NavigationStart, Router} from '@angular/router';
// 国际化服务
import {TranslateService} from '@ngx-translate/core';
// 路由事件
import {Observable} from 'rxjs';
import {filter} from 'rxjs/operators';
// cookie操作
import {CookieService} from 'ngx-cookie-service';
// 环境变量
import {environment} from './../environments/environment';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {

  // 登陆状态
  isLogin = this.cookieService.check(environment.tokenKey);

  navStart: Observable<NavigationStart>;

  /**
   *
   * @param translate 国际化
   * @param router 路由器
   * @param cookieService cookie管理服务
   */
  constructor(public translate: TranslateService, private router: Router, private cookieService: CookieService) {
    this.navStart = router.events.pipe(
      filter(evt => evt instanceof NavigationStart)
    ) as Observable<NavigationStart>;
  }

  public async ngOnInit() {
    this.navStart.subscribe(evt => {

      if (evt.url === '/' && this.isLogin) {
        this.router.navigateByUrl('/forum');
      } else if (evt.url === '/') {
        this.router.navigateByUrl('/login');
      } else {

      }

    });

    // 语言初始化(若未设置语言, 则取浏览器语言)
    const currentLanguage = await localStorage.getItem('currentLanguage') || this.translate.getBrowserCultureLang();
    // 当在assets/i18n中找不到对应的语言翻译时，使用'zh-CN'作为默认语言
    this.translate.setDefaultLang('zh-CN');
    this.translate.use(currentLanguage);
    // 记录当前设置的语言
    localStorage.setItem('currentLanguage', currentLanguage);
  }

}