/*!
 * @license
 * Copyright 2019 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Injectable } from '@angular/core';
import { Direction } from '@angular/cdk/bidi';
import { BehaviorSubject } from 'rxjs';
import { AppConfigService, AppConfigValues } from '../app-config/app-config.service';
import { UserPreferencesService } from './user-preferences.service';

export interface LanguageItem {
    key: string;
    label: string;
    direction?: Direction;
}

@Injectable({providedIn: 'root'})
export class LanguageService {

    private languages = new BehaviorSubject<LanguageItem[]>([
        {'key': 'de', 'label': 'Deutsch'},
        {'key': 'en', 'label': 'English'},
        {'key': 'es', 'label': 'Español'},
        {'key': 'fr', 'label': 'Français'},
        {'key': 'it', 'label': 'Italiano'},
        {'key': 'ja', 'label': '日本語'},
        {'key': 'nb', 'label': 'Bokmål'},
        {'key': 'nl', 'label': 'Nederlands'},
        {'key': 'pt-BR', 'label': 'Português (Brasil)'},
        {'key': 'ru', 'label': 'Русский'},
        {'key': 'zh-CN', 'label': '中文简体'},
        {'key': 'cs', 'label': 'Čeština'},
        {'key': 'da', 'label': 'Dansk'},
        {'key': 'fi', 'label': 'Suomi'},
        {'key': 'pl', 'label': 'Polski'},
        {'key': 'sv', 'label': 'Svenska'},
        {'key': 'ar', 'label': 'العربية', direction: 'rtl'}
    ]);

    languages$ = this.languages.asObservable();

    constructor(
        appConfigService: AppConfigService,
        private userPreferencesService: UserPreferencesService) {

        const customLanguages = appConfigService.get<Array<LanguageItem>>(AppConfigValues.APP_CONFIG_LANGUAGES_KEY);
        this.setLanguages(customLanguages);
    }

    changeLanguage(language: LanguageItem) {
        this.userPreferencesService.locale = language.key;
        this.userPreferencesService.set('textOrientation', language.direction || 'ltr');
    }

    setLanguages(items: LanguageItem[]) {
        if (items && items.length > 0) {
            this.languages.next(items);
        }
    }
}