/**
 * Copyright (c) Cohesive Integrations, LLC
 * Copyright (c) Codice Foundation
 *
 * This 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 3 of the License, or 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 Lesser General Public License for more
 * details. A copy of the GNU Lesser General Public License is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 * 
 **/
package net.di2e.ecdr.search.transform.geo.formatter;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.vividsolutions.jts.geom.Envelope;
import org.apache.abdera.ext.geo.Box;
import org.apache.abdera.ext.geo.Position;

import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.LinearRing;

public class Polygon extends MultiPoint {

    public static final String TYPE = "Polygon";

    public Polygon( Geometry geometry ) {
        super( geometry );
    }

    /**
     * 
     * @param coordinates
     *            a List of coordinates formatted in the GeoJSON Array equivalent
     * @return
     */
    public static CompositeGeometry toCompositeGeometry( List coordinates ) {
        return new Polygon( buildPolygon( coordinates ) );
    }

    @Override
    public Map toJsonMap() {
        Map map = new HashMap();

        if ( TYPE.equals( getGeometry().getGeometryType() ) ) {

            map.put( TYPE_KEY, TYPE );

            List linearRingsList = buildJsonPolygon( (com.vividsolutions.jts.geom.Polygon) getGeometry() );

            map.put( COORDINATES_KEY, linearRingsList );

        } else {
            throw new UnsupportedOperationException( "Geometry is not a " + TYPE );
        }

        return map;

    }

    protected List buildJsonPolygon( com.vividsolutions.jts.geom.Polygon polygon ) {
        List linearRingsList = new ArrayList();

        // According GeoJSON spec, first LinearRing is the exterior ring
        linearRingsList.add( buildCoordinatesList( polygon.getExteriorRing().getCoordinates() ) );

        for ( int i = 0; i < polygon.getNumInteriorRing(); i++ ) {
            linearRingsList.add( buildCoordinatesList( polygon.getInteriorRingN( i ).getCoordinates() ) );
        }
        return linearRingsList;
    }

    protected static com.vividsolutions.jts.geom.Polygon buildPolygon( List coordinates ) {

        // according to the GeoJson specification, first ring is the exterior
        LinearRing exterior = GEOMETRY_FACTORY.createLinearRing( getCoordinates( (List) coordinates.get( 0 ) ) );

        LinearRing[] interiorHoles = new LinearRing[coordinates.size() - 1];

        for ( int i = 1; i < coordinates.size(); i++ ) {
            interiorHoles[i - 1] = GEOMETRY_FACTORY.createLinearRing( getCoordinates( (List) coordinates.get( i ) ) );
        }

        return GEOMETRY_FACTORY.createPolygon( exterior, interiorHoles );
    }

    @Override
    public List<Position> toGeoRssPositions() {

        if (getGeometry().isRectangle()) {
            Envelope envelope = getGeometry().getEnvelopeInternal();
            org.apache.abdera.ext.geo.Coordinate upperCorner = new org.apache.abdera.ext.geo.Coordinate(envelope.getMinY(), envelope.getMinX());
            org.apache.abdera.ext.geo.Coordinate lowerCorner = new org.apache.abdera.ext.geo.Coordinate(envelope.getMaxY(), envelope.getMaxX());
            return Arrays.asList((Position) (new Box(upperCorner, lowerCorner)));
        } else {
            org.apache.abdera.ext.geo.Coordinates coords = getPolygonCoordinates((com.vividsolutions.jts.geom.Polygon) getGeometry());

            return Arrays.asList((Position) (new org.apache.abdera.ext.geo.Polygon(coords)));
        }

    }

    protected org.apache.abdera.ext.geo.Coordinates getPolygonCoordinates( com.vividsolutions.jts.geom.Polygon polygon ) {

        org.apache.abdera.ext.geo.Coordinates coords = new org.apache.abdera.ext.geo.Coordinates();

        // it does not look like http://georss.org/simple or
        // http://georss.org/gml can handle
        // interior rings
        for ( com.vividsolutions.jts.geom.Coordinate jtsCoordinate : polygon.getExteriorRing().getCoordinates() ) {

            coords.add( convert( jtsCoordinate ) );

        }
        return coords;
    }
}