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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.decode;

import java.util.Collections;
import java.util.Set;

import org.apache.xmlbeans.XmlObject;
import org.n52.shetland.ogc.SupportedType;
import org.n52.shetland.ogc.sos.Sos2Constants;
import org.n52.shetland.ogc.sos.delobs.DeleteObservationConstants;
import org.n52.shetland.ogc.sos.delobs.DeleteObservationRequest;
import org.n52.shetland.util.CollectionHelper;
import org.n52.svalbard.decode.exception.DecodingException;
import org.n52.svalbard.decode.exception.UnsupportedDecoderInputException;
import org.n52.svalbard.util.CodingHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Joiner;

import net.opengis.sosdo.x10.DeleteObservationDocument;
import net.opengis.sosdo.x10.DeleteObservationType;

/**
 * @author Eike Hinderk
 *         Jürrens
 *
 * @since 1.0.0
 */
public class DeleteObservationDecoder
        extends AbstractXmlDecoder {

    private static final Set DECODER_KEYS = CollectionHelper.union(
            CodingHelper.decoderKeysForElements(DeleteObservationConstants.NS_SOSDO_1_0,
                    DeleteObservationDocument.class),
            CodingHelper.xmlDecoderKeysForOperation(Sos2Constants.SOS, Sos2Constants.SERVICEVERSION,
                    DeleteObservationConstants.Operations.DeleteObservation));

    private static final Logger LOGGER = LoggerFactory.getLogger(DeleteObservationDecoder.class);

    public DeleteObservationDecoder() {
        LOGGER.debug("Decoder for the following keys initialized successfully: {}!",
                Joiner.on(", ").join(DECODER_KEYS));
    }

    @Override
    public Set getKeys() {
        return Collections.unmodifiableSet(DECODER_KEYS);
    }

    @Override
    public DeleteObservationRequest decode(XmlObject xmlObject) throws DecodingException {
        LOGGER.debug("REQUESTTYPE: {}", xmlObject != null ? xmlObject.getClass() : "null recevied");
        // XmlHelper.validateDocument(xmlObject);
        if (xmlObject instanceof DeleteObservationDocument) {
            DeleteObservationDocument delObsDoc = (DeleteObservationDocument) xmlObject;
            DeleteObservationRequest decodedRequest = parseDeleteObservation(delObsDoc);
            LOGGER.debug("Decoded request: {}", decodedRequest);
            return decodedRequest;
        } else {
            throw new UnsupportedDecoderInputException(this, xmlObject);
        }
    }

    private DeleteObservationRequest parseDeleteObservation(DeleteObservationDocument xbDelObsDoc)
            throws DecodingException {
        DeleteObservationRequest delObsRequest = null;

        DeleteObservationType xbDelObsType = xbDelObsDoc.getDeleteObservation();

        if (xbDelObsType != null) {
            delObsRequest = new DeleteObservationRequest(DeleteObservationConstants.NS_SOSDO_1_0);
            delObsRequest.setVersion(xbDelObsType.getVersion());
            delObsRequest.setService(xbDelObsType.getService());
            delObsRequest.addObservationIdentifier(xbDelObsType.getObservation());
        } else {
            throw new DecodingException(
                    "Received XML document is not valid. Set log level to debug to get more details");
        }

        return delObsRequest;
    }

    @Override
    public Set getSupportedTypes() {
        return Collections.emptySet();
    }

}