/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onebusaway.webapp.gwt.where_library;

import org.onebusaway.geospatial.model.CoordinateBounds;

import com.google.gwt.core.client.JavaScriptObject;

public class OBAConfig extends JavaScriptObject {

  private static native OBAConfig getInternalConfig() /*-{ return $wnd.OBA.Config }-*/;

  private static OBAConfig _instance = getInternalConfig();

  public static OBAConfig getConfig() {
    return _instance;
  }

  protected OBAConfig() {

  }

  public final native boolean hasDefaultServiceArea() /*-{ return this.hasDefaultServiceArea; }-*/;

  public final native double getCenterLat() /*-{ return this.centerLat; }-*/;

  public final native double getCenterLon() /*-{ return this.centerLon; }-*/;

  public final native double getSpanLat() /*-{ return this.spanLat; }-*/;

  public final native double getSpanLon() /*-{ return this.spanLon; }-*/;

  public final CoordinateBounds getBounds() {
    double lat = getCenterLat();
    double lon = getCenterLon();
    double latSpan = getSpanLat() / 2;
    double lonSpan = getSpanLon() / 2;
    return new CoordinateBounds(lat - latSpan, lon - lonSpan, lat + latSpan,
        lon + lonSpan);
  }
}