/**
    * I waive copyright and related rights in the this work worldwide through the CC0 1.0 Universal
    * public domain dedication. https://creativecommons.org/publicdomain/zero/1.0/legalcode
    */
   
   package gov.usgs.volcanoes.winston.server.http.cmd.fdsnws.constraint;
   
   import java.awt.geom.Point2D;
   
  import gov.usgs.proj.Projection;
  import gov.usgs.volcanoes.core.util.StringUtils;
  import gov.usgs.volcanoes.winston.Channel;
  import gov.usgs.volcanoes.winston.Instrument;
  
  /**
   * Constrain results to a geographical circle.
   * 
   * @author Tom Parker
   *
   */
  public class GeographicCircleConstraint extends GeographicConstraint {
  
    private static double DEFAULT_LATITUDE = 0;
    private static double DEFAULT_LONGITUDE = 0;
    private static double DEFAULT_MINRADIUS = 0;
    private static double DEFAULT_MAXRADIUS = 180;
  
    private Point2D.Double point;
    private double minRadius;
    private double maxRadius;
  
    /**
     * Constructor.
     * 
     * @param latitude decimal latitude
     * @param longitude decimal longitude
     * @param minRadius min radius in degrees
     * @param maxRadius max radius in degrees
     */
    public GeographicCircleConstraint(final String latitude, final String longitude,
        final String minRadius, final String maxRadius) {
      final double lat = StringUtils.stringToDouble(latitude, DEFAULT_LATITUDE);
      final double lon = StringUtils.stringToDouble(longitude, DEFAULT_LONGITUDE);
  
      point = new Point2D.Double(lat, lon);
  
      this.minRadius = StringUtils.stringToDouble(minRadius, DEFAULT_MINRADIUS);
      this.maxRadius = StringUtils.stringToDouble(maxRadius, DEFAULT_MAXRADIUS);
    }
  
    public boolean matches(final Channel chan) {
      final Instrument i = chan.getInstrument();
      final double lat = i.getLatitude();
      final double lon = i.getLongitude();
  
      if (Double.isNaN(lat) || Double.isNaN(lon)) {
        return false;
      }
  
      final Point2D.Double p = new Point2D.Double(lat, lon);
      final double radius = Projection.distanceBetweenDegree(point, p);
  
      return (radius >= minRadius && radius <= maxRadius);
    }
  
    @Override
    public String toString() {
      return "FdsnGeographicCircleConstraint: " + point.x + "," + point.y + " " + minRadius + " >< "
          + maxRadius;
    }
  }