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/*
 * This file is part of onkostar-plugin-dnpm
 *
 * Copyright (C) 2023-2026 the original author or authors.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package dev.dnpm.oshelper.services.systemtherapie;

import de.itc.onkostar.api.IOnkostarApi;
import de.itc.onkostar.api.Patient;
import de.itc.onkostar.api.Procedure;
import dev.dnpm.oshelper.dto.EcogStatusWithDate;
import dev.dnpm.oshelper.services.SettingsService;
import java.util.*;
import java.util.stream.Collectors;

/**
 * Standardimplementierung des Systemtherapieservices
 *
 * @since 0.2.0
 */
public class DefaultSystemtherapieService implements SystemtherapieService {

  private static final String ECOG_FIELD = "ECOGvorTherapie";

  private final IOnkostarApi onkostarApi;

  private final SettingsService settingsService;

  public DefaultSystemtherapieService(
      final IOnkostarApi onkostarApi, final SettingsService settingsService) {
    this.onkostarApi = onkostarApi;
    this.settingsService = settingsService;
  }

  /**
   * Ermittelt eine Zusammenfassung der systemischen Therapien für eine Erkrankung
   *
   * @param diseaseId Die ID der Erkrankung
   * @return Zusammenfassung der systemischen Therapien
   */
  @Override
  public List<Map<String, String>> getSystemischeTherapienFromDiagnose(int diseaseId) {
    List<Map<String, String>> result = new ArrayList<>();
    for (Procedure prozedur : onkostarApi.getProceduresForDiseaseByForm(diseaseId, getFormName())) {
      prozedurToProzedurwerteMapper(prozedur).apply(prozedur).ifPresent(result::add);
    }
    return result;
  }

  /**
   * Übergibt aktuell immer den Mapper für das Formular "OS.Systemische Therapie", da beide bekannte
   * Varianten damit gemappt werden können.
   *
   * @param procedure Die Prozedur für die ein Mapper erstellt werden soll
   * @return Der Mapper für die Prozedur
   */
  @Override
  public ProzedurToProzedurwerteMapper prozedurToProzedurwerteMapper(Procedure procedure) {
    return new OsSystemischeTherapieToProzedurwerteMapper();
  }

  /**
   * Ermittelt den letzten bekannten ECOG-Status aus allen Systemtherapieformularen des Patienten
   *
   * @param patient Der zu verwendende Patient
   * @return Der ECOG-Status als String oder leeres Optional
   */
  @Override
  public Optional<String> latestEcogStatus(Patient patient) {
    return ecogStatus(patient).stream()
        .max(Comparator.comparing(EcogStatusWithDate::getDate))
        .map(EcogStatusWithDate::getStatus);
  }

  /**
   * Ermittelt jeden bekannten ECOG-Status aus allen Systemtherapieformularen des Patienten
   *
   * @param patient Der zu verwendende Patient
   * @return Eine Liste mit Datum und ECOG-Status als String
   */
  @Override
  public List<EcogStatusWithDate> ecogStatus(Patient patient) {
    return patient.getDiseases().stream()
        .flatMap(
            disease ->
                onkostarApi.getProceduresForDiseaseByForm(disease.getId(), getFormName()).stream())
        .filter(procedure -> null != procedure.getStartDate())
        .sorted(Comparator.comparing(Procedure::getStartDate))
        .map(
            procedure -> {
              try {
                return new EcogStatusWithDate(
                    procedure.getStartDate(), procedure.getValue(ECOG_FIELD).getString());
              } catch (IllegalArgumentException e) {
                return null;
              }
            })
        .filter(Objects::nonNull)
        .collect(Collectors.toList());
  }

  private String getFormName() {
    return settingsService.getSetting("systemtherapieform").orElse("OS.Systemische Therapie");
  }
}