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/*

 * gvSIG. Desktop Geographic Information System.

 * 

 * Copyright (C) 2007-2020 gvSIG Association.

 * 

 * 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 <https://www.gnu.org/licenses/>. 

 * 

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.vcsgis.lib.repository.remoteclient.requests;

import java.io.BufferedReader;

import java.io.OutputStream;

import javax.json.JsonObject;

import javax.json.stream.JsonParser;

import org.apache.commons.io.IOUtils;

import org.gvsig.json.Json;

import org.gvsig.json.JsonObjectBuilder;

import org.gvsig.tools.dispose.DisposableIterable;

import org.gvsig.vcsgis.lib.EntityEditableImpl;

import org.gvsig.vcsgis.lib.PipedIterator;

import org.gvsig.vcsgis.lib.SAJParserImpl;

import org.gvsig.vcsgis.lib.SAJParserImpl.SAJParserContext;

import org.gvsig.vcsgis.lib.VCSGisEntity;

import static org.gvsig.vcsgis.lib.VCSGisManager.ERR_CANT_CHECKOUT;

import static org.gvsig.vcsgis.lib.VCSGisManager.ERR_OK;

import org.gvsig.vcsgis.lib.VCSGisRepositoryDataImpl;

import org.gvsig.vcsgis.lib.repository.VCSGisRepositoryData;

import org.gvsig.vcsgis.lib.repository.remoteclient.VCSGisRepositoryClient;

import org.gvsig.vcsgis.lib.repository.requests.VCSGisUpdateRequest;

import org.gvsig.vcsgis.lib.requests.UpdateRequestHelper;

/**

 *

 * @author gvSIG Team

 */

@SuppressWarnings("UseSpecificCatch")

public class UpdateRequestClient  extends AbstractRequestClient implements VCSGisUpdateRequest {

    public UpdateRequestClient(VCSGisRepositoryClient repository, String entityName) {

        super(

                new UpdateRequestHelper(repository, entityName),

                repository.getUrl("update")

        );

    }

    @Override

    public UpdateRequestHelper helper() {

        return (UpdateRequestHelper) super.helper(); 

    }

    @Override

    public String getEntityName() {

        return helper().getEntityName();

    }

    @Override

    public String getLocalRevisionCode() {

        return helper().getLocalRevisionCode();

    }

    @Override

    public void setLocalRevisionCode(String revisionCode) {

        helper().setLocalRevisionCode(revisionCode);

    }

    @Override

    public VCSGisEntity getEntity() {

        return helper().getEntity();

    }

    @Override

    public DisposableIterable<VCSGisRepositoryData> getData() {

        return helper().getData();

    }

    @Override

    public void requestProducer(OutputStream out) {

        try {

            LOGGER.debug("===: ["+this.getRequestName()+"] requestProducer 1");

            JsonObjectBuilder parametersBuilder = Json.createObjectBuilder();

            parametersBuilder.add("EntityName", this.getEntityName());

            parametersBuilder.add("LocalRevisionCode", this.getLocalRevisionCode());

            JsonObjectBuilder builder = Json.createObjectBuilder();

            builder.add("Parameters", parametersBuilder);

            IOUtils.write(builder.toString(), out);

            error(ERR_OK);

        } catch (Exception ex) {

            LOGGER.warn("Can't produce Json data for "+this.getRequestName()+" request.",ex);

            error(ERR_CANT_CHECKOUT, "Can't produce Json data for "+this.getRequestName()+" request. "+ ex.getMessage());

        } finally {

            IOUtils.closeQuietly(out);

        }

    }

    @Override

    public void responseConsumer(BufferedReader request_contents) {

        LOGGER.debug("===: ["+this.getRequestName()+"] responseConsumer 1");

        final PipedIterator<VCSGisRepositoryData> dataIterator = new PipedIterator<>();                

        helper().data = dataIterator;

        LOGGER.debug("===: ["+this.getRequestName()+"] responseConsumer 2");

        SAJParserImpl parser = new SAJParserImpl(

                request_contents, 

                (SAJParserContext context, JsonParser.Event e, Object value) -> {

                    if( e==null ) {

                        return;

                    }

                    switch (e) {

                        case END_OBJECT:

                            switch(context.getPathName()) {

                                case "/Parameters":

                                    JsonObject jsonParams = ((javax.json.JsonObjectBuilder)value).build();

                                    helper().error(

                                            jsonParams.getInt("StatusCode", ERR_OK),

                                            jsonParams.getString("StatusMessage", null)

                                    );

                                    if( jsonParams.isNull("Entity") ) {

                                        helper().entity = null;

                                    } else {

                                        helper().entity = new EntityEditableImpl(

                                                jsonParams.getJsonObject("Entity")

                                        );

                                    }

                                    notifyResponseConsumers();

                                    break;

                                case "/Data/?":

                                    // Hemos terminado de generar un elemento del array

                                    // de datos, construimos un VCSGisRepositoryData y lo adicionamos a la

                                    // cola de cambios.

                                    JsonObject jsonData = ((javax.json.JsonObjectBuilder)value).build();

                                    VCSGisRepositoryData data = new VCSGisRepositoryDataImpl(jsonData);

                                    dataIterator.put(data);

                                    break;

                            }

                            break;

                        case END_ARRAY:

                            if( "/Data".equals(context.getPathName()) ) {

                                dataIterator.close();

                            }

                            break;

                        case START_ARRAY:

                            switch(context.getPathName()) {

                                case "/Data":

                                    // Forzamos que no se cree el array en memoria.

                                    context.setArrayBuilder(null);

                                    break;

                            }

                            break;

                    }

        });

        parser.parse();

    }

}