/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    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;
 *    version 2.1 of the License.
 *
 *    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.geotools.gml2.bindings;

import java.util.StringTokenizer;

import javax.xml.namespace.QName;

import org.geotools.gml2.GML;
import org.geotools.xml.AbstractComplexBinding;
import org.geotools.xml.ElementInstance;
import org.geotools.xml.Node;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.CoordinateSequenceFactory;


/**
 * Binding object for the type http://www.opengis.net/gml:CoordinatesType.
 *
 * <p>
 *        <pre>
 *         <code>
 *  <complexType name="CoordinatesType">
 *      <annotation>
 *          <documentation>         Coordinates can be included in a single
 *              string, but there is no          facility for validating
 *              string content. The value of the 'cs' attribute
 *              is the separator for coordinate values, and the value of the
 *              'ts'          attribute gives the tuple separator
 *              (a single space by default); the          default values may
 *              be changed to reflect local usage.       </documentation>
 *      </annotation>
 *      <simpleContent>
 *          <extension base="string">
 *              <attribute name="decimal" type="string" use="optional" default="."/>
 *              <attribute name="cs" type="string" use="optional" default=","/>
 *              <attribute name="ts" type="string" use="optional" default=" "/>
 *          </extension>
 *      </simpleContent>
 *  </complexType>
 *
 *          </code>
 *         </pre>
 * </p>
 *
 * @generated
 *
 *
 * @source $URL$
 */
public class GMLCoordinatesTypeBinding extends AbstractComplexBinding {
    CoordinateSequenceFactory csFactory;

    public GMLCoordinatesTypeBinding(CoordinateSequenceFactory csFactory) {
        this.csFactory = csFactory;
    }

    /**
     * @generated
     */
    public QName getTarget() {
        return GML.CoordinatesType;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public Class getType() {
        return CoordinateSequence.class;
    }

    /**
     * <!-- begin-user-doc -->
     * Returns an object of type {@see com.vividsolutions.jts.geom.CoordinateSequence}
     * TODO: this method should do more validation of the string
     * <!-- end-user-doc -->
     *
     * @generated modifiable
     */
    public Object parse(ElementInstance instance, Node node, Object value)
        throws Exception {
        //get the coordinate and tuple seperators
        String decimal = ".";
        String cs = ",";
        String ts = " ";

        if (node.getAttribute("decimal") != null) {
            decimal = (String) node.getAttribute("decimal").getValue();
        }

        if (node.getAttribute("cs") != null) {
            cs = (String) node.getAttribute("cs").getValue();
        }

        if (node.getAttribute("ts") != null) {
            ts = (String) node.getAttribute("ts").getValue();
        }

        //do the parsing
        String text = instance.getText();

        //eliminate newlines, repeated spaces, etc
        final String anyBlankSeq = "\\s+";
        final String singleSpace = " ";
        text = text.replaceAll(anyBlankSeq, singleSpace);

        //first tokenize by tuple seperators
        StringTokenizer tuples = new StringTokenizer(text, ts);
        CoordinateSequence seq = null;
        int i = 0;
        int ncoords = tuples.countTokens(); //number of coordinates

        while (tuples.hasMoreTokens()) {
            String tuple = tuples.nextToken();

            //next tokenize by coordinate seperator
            String[] oords = tuple.split(cs);

            //next tokenize by decimal
            String x = null;

            //next tokenize by decimal
            String y = null;

            //next tokenize by decimal
            String z = null;

            //must be at least 1D			
            x = ".".equals(decimal) ? oords[0] : oords[0].replaceAll(decimal, ".");

            //check for 2 and 3 D
            if (oords.length > 1) {
                y = ".".equals(decimal) ? oords[1] : oords[1].replaceAll(decimal, ".");
            }

            if (oords.length > 2) {
                z = ".".equals(decimal) ? oords[2] : oords[2].replaceAll(decimal, ".");
            }

            if (seq == null) {
                seq = csFactory.create(ncoords, oords.length);
            }

            seq.setOrdinate(i, CoordinateSequence.X, Double.parseDouble(x));

            if (y != null) {
                seq.setOrdinate(i, CoordinateSequence.Y, Double.parseDouble(y));
            }

            if (z != null) {
                seq.setOrdinate(i, CoordinateSequence.Z, Double.parseDouble(z));
            }

            i++;
        }

        return seq;
    }

    public Element encode(Object object, Document document, Element value)
        throws Exception {
        CoordinateSequence coordinates = (CoordinateSequence) object;
        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < coordinates.size(); i++) {
            Coordinate c = coordinates.getCoordinate(i);
            buf.append(c.x);

            boolean y = (coordinates.getDimension() > 1) && !new Double(c.y).isNaN();

            if (y) {
                buf.append("," + c.y);
            }

            boolean z = y && (coordinates.getDimension() > 2) && !new Double(c.z).isNaN();

            if (z) {
                buf.append("," + c.z);
            }

            if (i < (coordinates.size() - 1)) {
                buf.append(" ");
            }
        }

        value.appendChild(document.createTextNode(buf.toString()));

        return value;
    }
}