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/*
 * Copyright 2015-2020 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.n52.svalbard.encode;

import java.util.List;

import org.apache.xmlbeans.XmlObject;
import org.n52.shetland.ogc.om.OmConstants;
import org.n52.shetland.ogc.om.OmObservation;
import org.n52.shetland.ogc.ows.extension.Extension;
import org.n52.shetland.ogc.ows.extension.Extensions;
import org.n52.shetland.ogc.sos.Sos2Constants;
import org.n52.shetland.ogc.sos.SosConstants;
import org.n52.shetland.ogc.sos.request.InsertObservationRequest;
import org.n52.shetland.ogc.swes.SwesConstants;
import org.n52.svalbard.encode.exception.EncodingException;
import org.n52.svalbard.encode.exception.UnsupportedEncoderInputException;

import net.opengis.sos.x20.InsertObservationDocument;
import net.opengis.sos.x20.InsertObservationType;
import net.opengis.sos.x20.InsertObservationType.Observation;

/**
 * @author Jürrens, Eike Hinderk
 */
public class InsertObservationRequestEncoder extends AbstractSwesRequestEncoder {

    public InsertObservationRequestEncoder() {
        super(SosConstants.Operations.InsertObservation.name(), InsertObservationRequest.class);
    }

    @Override
    protected XmlObject create(InsertObservationRequest request) throws EncodingException {
        validateInput(request);
        InsertObservationDocument doc = InsertObservationDocument.Factory.newInstance(getXmlOptions());
        InsertObservationType insertObservation = doc.addNewInsertObservation();
        insertObservation.setService(request.getService());
        insertObservation.setVersion(request.getVersion());
        addExtensions(request.getExtensions(), insertObservation);
        addOfferings(request.getOfferings(), insertObservation);
        addObservations(request.getObservations(), insertObservation);
        return doc;
    }

    private void addObservations(List observations, InsertObservationType insertObservation)
            throws EncodingException {
        Observation ob = insertObservation.addNewObservation();
        for (OmObservation o : observations) {
            ob.addNewOMObservation().set(encodeObjectToXmlDocument(OmConstants.NS_OM_2, o));
        }
    }

    private void addExtensions(Extensions extensions, InsertObservationType insertObservation)
            throws EncodingException {
        if (extensions == null || extensions.isEmpty()) {
            return;
        }
        for (Extension o : extensions.getExtensions()) {
            insertObservation.addNewExtension().set(encodeObjectToXml(SwesConstants.NS_SWES_20, o));
        }
    }

    private void addOfferings(List offerings, InsertObservationType insertObservation) {
        offerings.stream().forEach(o -> insertObservation.addNewOffering().setStringValue(o));
    }

    @Override
    protected void validateInput(InsertObservationRequest request) throws UnsupportedEncoderInputException {
        super.validateInput(request);
        if (!request.getVersion().equals(Sos2Constants.SERVICEVERSION)) {
            throw new UnsupportedEncoderInputException(this, "SOS 1.0.0 insert observation request");
        }
        if (!request.isSetOfferings()) {
            throw new UnsupportedEncoderInputException(this, "missing offering(s)");
        }
        if (!request.isSetObservation()) {
            throw new UnsupportedEncoderInputException(this, "missing observation(s)");
        }
    }

}