/*
 *    Geotoolkit - An Open Source Java GIS Toolkit
 *    http://www.geotoolkit.org
 *
 *    (C) 2012, Geomatys
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotoolkit.wps.converters.inputs.references;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Map;
import javax.xml.bind.JAXBException;
import javax.xml.stream.XMLStreamException;
import org.apache.sis.storage.DataStoreException;
import org.geotoolkit.data.FeatureCollection;
import org.geotoolkit.feature.xml.XmlFeatureReader;
import org.apache.sis.util.UnconvertibleObjectException;
import org.geotoolkit.wps.converters.WPSConvertersUtils;
import org.geotoolkit.wps.io.WPSMimeType;
import org.geotoolkit.wps.xml.Reference;
import org.opengis.util.FactoryException;

/**
 * Implementation of ObjectConverter to convert a reference into a FeatureCollection.
 *
 * @author Quentin Boileau (Geomatys).
 * @author Theo Zozime
 */
public final class ReferenceToFeatureCollectionConverter extends AbstractReferenceInputConverter<FeatureCollection> {

    private static ReferenceToFeatureCollectionConverter INSTANCE;

    private ReferenceToFeatureCollectionConverter() {
    }

    public static synchronized ReferenceToFeatureCollectionConverter getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new ReferenceToFeatureCollectionConverter();
        }
        return INSTANCE;
    }

    @Override
    public Class<FeatureCollection> getTargetClass() {
        return FeatureCollection.class;
    }

    /**
     * {@inheritDoc}
     *
     * @return FeatureCollection.
     */
    @Override
    public FeatureCollection convert(final Reference source, final Map<String, Object> params) throws UnconvertibleObjectException {

        final String mime = source.getMimeType() != null ? source.getMimeType() : WPSMimeType.TEXT_XML.val();
        final InputStream stream = getInputStreamFromReference(source);

        //XML
        if (mime.equalsIgnoreCase(WPSMimeType.TEXT_XML.val())
                || mime.equalsIgnoreCase(WPSMimeType.APP_GML.val())
                || mime.equalsIgnoreCase(WPSMimeType.TEXT_GML.val())) {

            XmlFeatureReader fcollReader = null;
            try {
                fcollReader = getFeatureReader(source);
                final FeatureCollection fcoll = (FeatureCollection) fcollReader.read(stream);
                return (FeatureCollection) WPSConvertersUtils.fixFeature(fcoll);

            } catch (FactoryException ex) {
                throw new UnconvertibleObjectException("Invalid reference input : can't spread CRS.", ex);
            } catch (IllegalArgumentException ex) {
                throw new UnconvertibleObjectException("Unable to read the feature with the specified schema.", ex);
            } catch (JAXBException ex) {
                throw new UnconvertibleObjectException("Invalid reference input : can't read reference schema.", ex);
            } catch (MalformedURLException ex) {
                throw new UnconvertibleObjectException("Invalid reference input : Malformed schema or resource.", ex);
            } catch (IOException ex) {
                throw new UnconvertibleObjectException("Invalid reference input : IO.", ex);
            } catch (XMLStreamException ex) {
                throw new UnconvertibleObjectException("Invalid reference input.", ex);
            } finally {
                if (fcollReader != null) {
                    fcollReader.dispose();
                }
            }
        } else if (mime.equalsIgnoreCase(WPSMimeType.APP_GEOJSON.val())) {
            try {
                return WPSConvertersUtils.readFeatureCollectionFromJson(URI.create(source.getHref()));
            } catch (DataStoreException | URISyntaxException | IOException ex) {
                throw new UnconvertibleObjectException(ex);
            }
            // SHP
        } else if (mime.equalsIgnoreCase(WPSMimeType.APP_SHP.val())
                || mime.equalsIgnoreCase(WPSMimeType.APP_OCTET.val())) {
            return null;
//            try {
//                Hints.putSystemDefault(Hints.LENIENT_DATUM_SHIFT, Boolean.TRUE);
//                final Map<String, Serializable> parameters = new HashMap<String, Serializable>();
//                parameters.put("url", new URL(href));
//
//                final FeatureStore store = DataStoreFinder.get(parameters);
//
//                if (store == null) {
//                    throw new UnconvertibleObjectException("Invalid URL");
//                }
//
//                if (store.getNames().size() != 1) {
//                    throw new UnconvertibleObjectException("More than one FeatureCollection in the file");
//                }
//
//                final FeatureCollection collection = store.createSession(true).getFeatureCollection(QueryBuilder.all(store.getNames().iterator().next()));
//                if (collection != null) {
//                    return collection;
//                } else {
//                    throw new UnconvertibleObjectException("Collection not found");
//                }
//
//            } catch (DataStoreException ex) {
//                throw new UnconvertibleObjectException("Invalid reference input : Malformed schema or resource.", ex);
//            } catch (MalformedURLException ex) {
//                throw new UnconvertibleObjectException("Invalid reference input : Malformed schema or resource.", ex);
//            }

        } else {
            throw new UnconvertibleObjectException("Unsupported mime-type for " + this.getClass().getName() +  " : " + source.getMimeType());
        }
    }
}