notification.service.ts

/*!
 * @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 { MatSnackBar, MatSnackBarRef, MatSnackBarConfig } from '@angular/material/snack-bar';
import { TranslationService } from '../../services/translation.service';
import { AppConfigService, AppConfigValues } from '../../app-config/app-config.service';
import { Subject } from 'rxjs';
import { NotificationModel } from '../models/notification.model';
import { info, warning, error } from '../helpers/notification.factory';

const INFO_SNACK_CLASS = 'adf-info-snackbar';
const WARN_SNACK_CLASS = 'adf-warning-snackbar';
const ERROR_SNACK_CLASS = 'adf-error-snackbar';

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

    DEFAULT_DURATION_MESSAGE: number = 5000;

    notifications$: Subject<NotificationModel> = new Subject();

    constructor(private snackBar: MatSnackBar,
                private translationService: TranslationService,
                private appConfigService: AppConfigService) {
        this.DEFAULT_DURATION_MESSAGE = this.appConfigService.get<number>(AppConfigValues.NOTIFY_DURATION) || this.DEFAULT_DURATION_MESSAGE;
    }

    /**
     * Opens a SnackBar notification to show a message.
     * @param message The message (or resource key) to show.
     * @param config Time before notification disappears after being shown or MatSnackBarConfig object
     * @param interpolateArgs The interpolation parameters to add for the translation
     * @returns Information/control object for the SnackBar
     */
    openSnackMessage(message: string, config?: number | MatSnackBarConfig, interpolateArgs?: any): MatSnackBarRef<any> {
        return this.dispatchNotification(message, null, config, interpolateArgs);
    }

    /**
     * Opens a SnackBar notification with a message and a response button.
     * @param message The message (or resource key) to show.
     * @param action Caption for the response button
     * @param config Time before notification disappears after being shown or MatSnackBarConfig object
     * @param interpolateArgs The interpolation parameters to add for the translation
     * @returns Information/control object for the SnackBar
     */
    openSnackMessageAction(message: string, action: string, config?: number | MatSnackBarConfig, interpolateArgs?: any): MatSnackBarRef<any> {
        return this.dispatchNotification(message, action, config, interpolateArgs);
    }

    /**
     * Rase error message
     * @param message Text message or translation key for the message.
     * @param action Action name
     * @param interpolateArgs The interpolation parameters to add for the translation
     */
    showError(message: string, action?: string, interpolateArgs?: any): MatSnackBarRef<any> {
        return this.dispatchNotification(message, action, { panelClass: ERROR_SNACK_CLASS }, interpolateArgs);
    }

    /**
     * Rase info message
     * @param message Text message or translation key for the message.
     * @param action Action name
     * @param interpolateArgs The interpolation parameters to add for the translation
     */
    showInfo(message: string, action?: string, interpolateArgs?: any): MatSnackBarRef<any> {
        return this.dispatchNotification(message, action, { panelClass: INFO_SNACK_CLASS }, interpolateArgs);
    }

    /**
     * Rase warning message
     * @param message Text message or translation key for the message.
     * @param action Action name
     * @param interpolateArgs The interpolation parameters to add for the translation
     */
    showWarning(message: string, action?: string, interpolateArgs?: any): MatSnackBarRef<any> {
        return this.dispatchNotification(message, action, { panelClass: WARN_SNACK_CLASS }, interpolateArgs);
    }

    /**
     *  dismiss the notification snackbar
     */
    dismissSnackMessageAction() {
        return this.snackBar.dismiss();
    }

    private dispatchNotification(message: string, action?: string, config?: number | MatSnackBarConfig, interpolateArgs?: any):  MatSnackBarRef<any> {
            const translatedMessage: string = this.translationService.instant(message, interpolateArgs);
            const translatedAction: string = this.translationService.instant(action, interpolateArgs);
            const createNotification = this.getNotificationCreator(config);
            this.notifications$.next(createNotification(translatedMessage));

            return this.snackBar.open(translatedMessage, translatedAction, {
                duration: (typeof config === 'number') ? config : this.DEFAULT_DURATION_MESSAGE,
                panelClass: INFO_SNACK_CLASS,
                ...( (typeof config === 'object') ? config : {} )
            });
    }

    private getNotificationCreator(config?: number | MatSnackBarConfig) {
        let panelClass: string = null;
        if (typeof config === 'object') {
            panelClass = Array.isArray(config.panelClass) ? config.panelClass[0] : config.panelClass;
        }

        switch (panelClass) {
            case ERROR_SNACK_CLASS:
                return error;
            case WARN_SNACK_CLASS:
                return warning;
            default:
                return info;
        }
    }
}