/*
 * This file is part of onkostar-plugin-dnpm
 *
 * Copyright (c) 2025 the original author or authors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package dev.dnpm.oshelper.services.systemtherapie;

import dev.dnpm.oshelper.dto.EcogStatusWithDate;
import dev.dnpm.oshelper.services.SettingsService;
import de.itc.onkostar.api.IOnkostarApi;
import de.itc.onkostar.api.Patient;
import de.itc.onkostar.api.Procedure;

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");
    }
}