import { Injectable } from "@angular/core";
import { TranslateService } from '@ngx-translate/core';
import { zhCN, enUS, NzLocaleService } from 'ng-zorro-antd';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';
export { zhCN, enUS } from 'ng-zorro-antd';

export const zh: string = "zh";
export const en: string = "en";

@Injectable()
export class CmI18nService {
    public defaultLang: string = zh;
    private langSource = new Subject<string>();
    public missionLang$: Observable<string> = null;
    constructor(private translateService: TranslateService, private nzTranslateService: NzLocaleService) {
        this.missionLang$ = this.langSource.asObservable();
    }
    public use(lang: string) {
        this.translateService.use(lang);
        if (lang == en) {
            this.nzTranslateService.setLocale(enUS);
        } else {
            this.nzTranslateService.setLocale(zhCN);
        }
        this.langSource.next(lang);
    }
    public get currentLang(): string {
        return this.translateService.currentLang;
    }
}