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package fr.ird.observe.spi.context;

/*-
 * #%L
 * ObServe Toolkit :: Service
 * %%
 * Copyright (C) 2017 - 2021 Ultreia.io
 * %%
 * 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, 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 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
 * .
 * #L%
 */

import fr.ird.observe.dto.reference.DataDtoReference;
import fr.ird.observe.dto.reference.DataDtoReferenceSet;
import fr.ird.observe.dto.reference.LazyDataDtoReferenceSet;
import fr.ird.observe.dto.reference.UpdatedDataDtoReferenceSet;
import fr.ird.observe.services.service.data.OpenableService;
import fr.ird.observe.spi.ServicesProvider;
import fr.ird.observe.spi.decoration.DecoratorService;

import java.util.Comparator;
import java.util.Objects;

/**
 * Created on 14/01/2021.
 *
 * @author Tony Chemit - [email protected]
 * @since 8.0.3
 */
public class EmptyChildrenDataReferenceSet extends LazyDataDtoReferenceSet {

    private final String parentId;
    private final OpenableDtoServiceContext spi;
    private final ServicesProvider servicesProvider;
    private final DecoratorService decoratorService;

    EmptyChildrenDataReferenceSet(String parentId, int initialCount, OpenableDtoServiceContext spi, ServicesProvider servicesProvider, DecoratorService decoratorService) {
        super(spi.getReferenceType(), initialCount);
        this.parentId = Objects.requireNonNull(parentId);
        this.spi = Objects.requireNonNull(spi);
        this.servicesProvider = Objects.requireNonNull(servicesProvider);
        this.decoratorService = Objects.requireNonNull(decoratorService);
    }

    @Override
    public Comparator getReferenceComparator() {
        return spi.getReferenceComparator();
    }

    @Override
    protected DataDtoReferenceSet createDelegate() {
        DataDtoReferenceSet previousResult = getDelegate();
        DataDtoReferenceSet result;
        OpenableService service = servicesProvider.getService(OpenableService.class);
        if (previousResult == null) {
            // first time load all data
            result = service.getChildren(spi.getDtoType(), parentId);
        } else {
            // ask an update of data
            UpdatedDataDtoReferenceSet updateResult = service.getChildrenUpdate(spi.getDtoType(), parentId, previousResult.getLastUpdate());
            // merge it with previous data
            result = updateResult.mergeTo(previousResult);
        }
        result.sort(spi.getReferenceComparator());
        decoratorService.installDecorator(result);
        return result;
    }
}