/*
 * Copyright (c) 2022. Deutsche Telekom AG
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */


import { CanDeactivate } from '@angular/router';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { TranslateService } from '@ngx-translate/core';

export interface ComponentCanDeactivate {
  canDeactivate: () => boolean;
}

@Injectable()
export class PendingChangesGuard implements CanDeactivate<ComponentCanDeactivate> {
  constructor(public translateService: TranslateService) {}

  canDeactivate(component: ComponentCanDeactivate): boolean | Observable<boolean> {
    // if there are no pending changes, just allow deactivation; else confirm first
    return component.canDeactivate()
      ? true
      : // NOTE: this warning message will only be shown when navigating elsewhere within your angular app;
        // when navigating away from your angular app, the browser will show a generic warning message
        // see http://stackoverflow.com/a/42207299/7307355
        confirm(this.translateService.instant('serviceModels.warningMessage.warning'));
  }
}