EDIT

// $Id$

/**

* Copyright (C) 2009 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.ext.geo;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.StringWriter;

import java.net.URL;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.TreeSet;

import javax.xml.stream.XMLOutputFactory;

import javax.xml.stream.XMLStreamException;

import javax.xml.stream.XMLStreamWriter;

import org.apache.log4j.Logger;

import org.jdom.Element;

import org.jdom.JDOMException;

import org.jdom.Namespace;

import eu.etaxonomy.cdm.common.CdmUtils;

import eu.etaxonomy.cdm.common.XmlHelp;

/**

 * Holds all values to map an NamedArea to a geo service area.

 *

 * TODO it must be possible to distinguish mappings for multiple layers in the same map service,

 *      that is the combination of GeoServiceType, URL and layer would be a unique key.

 *      This is however conflicting with the concept of the  subAreas which allows to combine multiple

 *      polygons from different layers.

 *      see also http://dev.e-taxonomy.eu/trac/ticket/4263

 *

 * @author a.mueller

 * @date 11.08.2011

 *

 */

public class GeoServiceArea {

    @SuppressWarnings("unused")

    private static final Logger logger = Logger.getLogger(GeoServiceArea.class);

    private static final String VALUE = "value";

    private static final String FIELD = "field";

    private static final String LAYER = "layer";

    private static final String AREA = "area";

    private static final String MAP_SERVICE_NAMESPACE = "http://www.etaxonomy.eu/cdm";

    private static final String MAP_SERVICE = "mapService";

    public enum GeoServiceType{

        EDIT("Edit Geo Service"),

        WMS("WMS Service");

        private final String label;

        private GeoServiceType(String label){

            this.label = label;

        }

        public String getLabel(){

            return label;

        }

    }

    private final TreeSet<SubArea> subAreas = new TreeSet<SubArea>();

    private URL serviceUri;

    private GeoServiceType type;

    public class SubArea implements Comparable<SubArea>{

        private String layer;

        private String field;

        private String value;

        @Override

        public int hashCode() {

            int hash;

            hash = 236435;

            hash += layer != null ? layer.hashCode() * 29 : 32;

            hash += field != null ? field.hashCode() * 31 : 32;

            hash += value != null ? value.hashCode() * 37 : 32;

            return hash;

        }

        @Override

        public boolean equals(Object otherArea) {

            if (! (otherArea instanceof SubArea)){

                return false;

            }

            SubArea subArea = (SubArea)otherArea;

            if (CdmUtils.nullSafeEqual(layer, subArea.layer)

                    && CdmUtils.nullSafeEqual(field, subArea.field)

                    && CdmUtils.nullSafeEqual(value, subArea.value)

            ){

                return true;

            }else{

                return false;

            }

        }

        @Override

        public int compareTo(SubArea otherArea) {

            int compareLayer = CdmUtils.Nz(this.layer).compareToIgnoreCase(CdmUtils.Nz(otherArea.layer));

            int compareField = CdmUtils.Nz(this.field).compareToIgnoreCase(CdmUtils.Nz(otherArea.field));

            int compareValue = CdmUtils.Nz(this.value).compareToIgnoreCase(CdmUtils.Nz(otherArea.value));

            if (compareLayer != 0){

                return compareLayer;

            }else if (compareField != 0 ){

                return compareField;

            }else {

                return compareValue;

            }

        }

    }

    public void add(String layer, String field, String value){

        SubArea newArea = new SubArea();

        newArea.layer = layer;

        newArea.field = field;

        newArea.value = value;

        subAreas.add(newArea);

    }

    /**

     * Returns the areas as a layer, field, area nested map.

     * @return

     */

    public Map<String, Map<String, List<String>>> getAreasMap(){

        Map<String, Map<String, List<String>>> result = new HashMap<String, Map<String,List<String>>>();

        for (SubArea area : subAreas){

            //layer

            Map<String, List<String>> layer = result.get(area.layer);

            if (layer == null ){

                layer = new HashMap<String, List<String>>();

                result.put(area.layer, layer);

            }

            //field

            List<String> field = layer.get(area.field);

            if (field == null ){

                field = new ArrayList<String>();

                layer.put(area.field, field);

            }

            //value

            if (! field.contains(area.value)){

                field.add(area.value);

            }

        }

        return result;

    }

    public List<SubArea> getAreasList(){

        List<SubArea> result = new ArrayList<SubArea>();

        for (SubArea area : subAreas){

            result.add(area);

        }

        return result;

    }

    public static boolean isAreaMapping(String xml){

        //TODO check by parsing or only testing root + namespace

        GeoServiceArea mapping = valueOf(xml);

        if (mapping != null){

            return true;

        }else{

            return false;

        }

    }

    public static GeoServiceArea valueOf (String xml){

        if (xml == null){

            return null;

        }

//		StringReader reader = new StringReader (xml);

//		(new InputSource(reader));

//		InputStream is = new java.io.StringBufferInputStream(xml);

        InputStream is = new ByteArrayInputStream(xml.getBytes());

        GeoServiceArea result = new GeoServiceArea();

        try {

            Element root = XmlHelp.getRoot(is);

            if (! root.getName().equals(MAP_SERVICE) || ! root.getNamespace().getURI().equals(MAP_SERVICE_NAMESPACE)   ){

                return null;

            }else{

                //TODO schema validation

                Namespace ns = root.getNamespace();

                List<Element> elAreas = root.getChildren(AREA, ns);

                for (Element elArea : elAreas){

                    Element layer = elArea.getChild(LAYER, ns);

                    Element field = elArea.getChild(FIELD, ns);

                    //TODO multiple values

                    List<Element> values = elArea.getChildren(VALUE, ns);

                    for (Element value : values){

                        result.add(layer.getTextTrim(), field.getTextTrim(), value.getTextTrim());

                    }

                }

                return result;

            }

        } catch (JDOMException e) {

            throw new RuntimeException(e);

        } catch (IOException e) {

            throw new RuntimeException(e);

        }

    }

    /**

     * @return

     * @throws XMLStreamException

     */

    //TODO use JAXB or other marshalling techniques

    public String toXml() throws XMLStreamException{

        XMLStreamWriter writer = null;

            XMLOutputFactory factory = XMLOutputFactory.newInstance();

            StringWriter stringWriter = new StringWriter();

            writer = factory.createXMLStreamWriter(stringWriter);

            String rootNamespace = MAP_SERVICE_NAMESPACE;

            String rootName = MAP_SERVICE;

            // create header

            writer.writeStartDocument();

            writer.setDefaultNamespace(rootNamespace);

                // create root element

                writer.writeStartElement(rootName);

                writer.writeNamespace(null, rootNamespace);

                writer.writeAttribute("type", "editMapService");

                writeAreas(writer);

                writer.writeEndElement();

            writer.writeEndDocument();

            return stringWriter.getBuffer().toString();

    }

    private void writeAreas(XMLStreamWriter writer) throws XMLStreamException {

        Map<String, Map<String, List<String>>> areaMap = getAreasMap();

        //TODO multiple

        for (String layerKey : areaMap.keySet()){

            Map<String, List<String>> layer = areaMap.get(layerKey);

            for (String fieldKey: layer.keySet()){

                List<String> field = layer.get(fieldKey);

                //area

                writer.writeStartElement(AREA);

                //layer

                writer.writeStartElement(LAYER);

                writer.writeCharacters(layerKey);

                writer.writeEndElement();

                //field

                writer.writeStartElement(FIELD);

                writer.writeCharacters(fieldKey);

                writer.writeEndElement();

                //value

                for (String value : field){

                    writer.writeStartElement(VALUE);

                    writer.writeCharacters(value);

                    writer.writeEndElement();

                }

                writer.writeEndElement();

            }

        }

    }

    public int size() {

        return this.subAreas.size();

    }

}