doseText.pipe.ts

import { R4 } from "@ahryman40k/ts-fhir-types";
import { Pipe, PipeTransform } from "@angular/core";
import { UntilDestroy } from "@ngneat/until-destroy";
import { Subscription } from 'rxjs/internal/Subscription';
import { LocalizedValueSetService } from "src/app/resources/foundation/terminology/value-set/state/localized-value-set.service";
import { ListItem } from 'src/app/state/abstract/list-item.model';

@UntilDestroy()
@Pipe({
  name: 'dosageText',
  pure: false
})
export class DosageTextPipe implements PipeTransform {

  listOfResasonCodes: ListItem[];
  subscribeListOfResasonCodes: Subscription;
  setAndSystem = 'http://fhir.synios.eu/ValueSet/Medication-Units';

  constructor(
    private valueSetService: LocalizedValueSetService
  ) {
    this.subscribeListOfResasonCodes = this.valueSetService.get(this.setAndSystem).selectList(this.setAndSystem).subscribe({
      next: (list) => this.listOfResasonCodes = list,
      error: (err) => console.log(err),
    });
  }

  transform(doseUnit: R4.ICodeableConcept) {
    const code = doseUnit.coding[0]?.code;
    if (!code) { return '' }
    const result = (this.listOfResasonCodes ?? []).find(item => item.key === code)?.text ?? '';
    return result;
  }

}