openstapps/src/app/translation/translate-simple.pipe.ts

/*
 * Copyright (C) 2023 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import {Injectable, OnDestroy, Pipe, PipeTransform} from '@angular/core';
import {TranslateService} from '@ngx-translate/core';
import {get} from '../_helpers/collections/get';
import {Subscription} from 'rxjs';

@Injectable()
@Pipe({
  name: 'translateSimple',
  pure: false,
})
export class TranslateSimplePipe implements PipeTransform, OnDestroy {
  value: unknown;

  query: unknown;

  thing: unknown;

  onLangChange: Subscription;

  constructor(private readonly translate: TranslateService) {}

  // eslint-disable-next-line @typescript-eslint/ban-types
  private updateValue() {
    try {
      this.value =
        get(
          // eslint-disable-next-line @typescript-eslint/no-explicit-any
          (this.thing as any).translations[this.translate.currentLang] ?? this.thing,
          this.query as string,
        ) ?? this.thing;
    } catch (error) {
      console.warn(`${this.query}: ${error}`);
      this.value = this.thing;
    }
  }

  transform<T extends object, P extends string[] | string | keyof T>(
    query: P,
    thing: T,
  ): P extends keyof T ? T[P] : P | unknown {
    // store the params, in case they change
    this.query = query;
    this.thing = thing;

    this.updateValue();

    this.onLangChange ??= this.translate.onLangChange.subscribe(() => {
      this.updateValue();
    });

    return this.value as never;
  }

  ngOnDestroy(): void {
    this.onLangChange?.unsubscribe();
  }
}