/**
 * Copyright (C) 2012-2017 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public
 * License version 2 and the aforementioned licenses.
 *
 * 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.
 */
package org.n52.sos.decode.json.impl;

import static org.n52.sos.coding.json.JSONConstants.BLOCK_SEPARATOR;
import static org.n52.sos.coding.json.JSONConstants.DECIMAL_SEPARATOR;
import static org.n52.sos.coding.json.JSONConstants.IDENTIFIER;
import static org.n52.sos.coding.json.JSONConstants.OBSERVATION_TEMPLATE;
import static org.n52.sos.coding.json.JSONConstants.OFFERING;
import static org.n52.sos.coding.json.JSONConstants.RESULT_ENCODING;
import static org.n52.sos.coding.json.JSONConstants.RESULT_STRUCTURE;
import static org.n52.sos.coding.json.JSONConstants.TOKEN_SEPARATOR;

import org.n52.sos.coding.json.JSONConstants;
import org.n52.sos.coding.json.SchemaConstants;
import org.n52.sos.decode.json.AbstractSosRequestDecoder;
import org.n52.sos.ogc.om.OmObservationConstellation;
import org.n52.sos.ogc.ows.OwsExceptionReport;
import org.n52.sos.ogc.sos.Sos2Constants;
import org.n52.sos.ogc.sos.SosConstants;
import org.n52.sos.ogc.sos.SosResultEncoding;
import org.n52.sos.ogc.sos.SosResultStructure;
import org.n52.sos.ogc.swe.SweDataRecord;
import org.n52.sos.ogc.swe.SweField;
import org.n52.sos.ogc.swe.encoding.SweTextEncoding;
import org.n52.sos.request.InsertResultTemplateRequest;

import com.fasterxml.jackson.databind.JsonNode;

/**
 * @since 4.0.0
 * 
 */
public class InsertResultTemplateRequestDecoder extends AbstractSosRequestDecoder<InsertResultTemplateRequest> {
    private final ObservationDecoder observationDecoder = new ObservationDecoder();

    public InsertResultTemplateRequestDecoder() {
        super(InsertResultTemplateRequest.class, SosConstants.SOS, Sos2Constants.SERVICEVERSION,
                Sos2Constants.Operations.InsertResultTemplate);
    }

    @Override
    public String getSchemaURI() {
        return SchemaConstants.Request.INSERT_RESULT_TEMPLATE;
    }

    @Override
    public InsertResultTemplateRequest decodeRequest(JsonNode node) throws OwsExceptionReport {
        InsertResultTemplateRequest irtr = new InsertResultTemplateRequest();
        if (!node.path(IDENTIFIER).isMissingNode()) {
            irtr.setIdentifier(node.path(IDENTIFIER).textValue());
        }
        irtr.setObservationTemplate(parseObservationTemplate(node));
        irtr.setResultStructure(parseResultStructure(node.path(RESULT_STRUCTURE)));
        irtr.setResultEncoding(parseResultEncoding(node.path(RESULT_ENCODING)));
        return irtr;
    }

    private OmObservationConstellation parseObservationTemplate(JsonNode node) throws OwsExceptionReport {
        final OmObservationConstellation oc =
                observationDecoder.parseObservationConstellation(node.path(OBSERVATION_TEMPLATE));
        oc.addOffering(node.path(OFFERING).textValue());
        return oc;
    }

    private SosResultStructure parseResultStructure(JsonNode node) throws OwsExceptionReport {
        SweDataRecord dataRecord = parseFields(node.path(JSONConstants.FIELDS));
        return new SosResultStructure().setResultStructure(dataRecord);
    }

    private SosResultEncoding parseResultEncoding(JsonNode node) {
        SweTextEncoding textEncoding = new SweTextEncoding();
        textEncoding.setTokenSeparator(node.path(TOKEN_SEPARATOR).textValue());
        textEncoding.setBlockSeparator(node.path(BLOCK_SEPARATOR).textValue());
        if (!node.path(DECIMAL_SEPARATOR).isMissingNode()) {
            textEncoding.setDecimalSeparator(node.path(DECIMAL_SEPARATOR).textValue());
        }
        return new SosResultEncoding().setEncoding(textEncoding);
    }

    protected SweDataRecord parseFields(JsonNode node) throws OwsExceptionReport {
        SweDataRecord dataRecord = new SweDataRecord();
        for (JsonNode field : node) {
            dataRecord.addField(decodeJsonToObject(field, SweField.class));
        }
        return dataRecord;
    }
}