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/*
 * Copyright 2008 ZXing authors
 *
 * 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 com.google.zxing.client.result;

import com.google.zxing.Result;

/**
 * Parses a "geo:" URI result, which specifies a location on the surface of
 * the Earth as well as an optional altitude above the surface. See
 * 
 * http://tools.ietf.org/html/draft-mayrhofer-geo-uri-00.
 *
 * @author Sean Owen
 */
final class GeoResultParser extends ResultParser {

  private GeoResultParser() {
  }

  public static GeoParsedResult parse(Result result) {
    String rawText = result.getText();
    if (rawText == null || (!rawText.startsWith("geo:") && !rawText.startsWith("GEO:"))) {
      return null;
    }
    // Drop geo, query portion
    int queryStart = rawText.indexOf('?', 4);
    String query;
    String geoURIWithoutQuery;
    if (queryStart < 0) {
      query = null;
      geoURIWithoutQuery = rawText.substring(4);
    } else {
      query = rawText.substring(queryStart + 1);
      geoURIWithoutQuery = rawText.substring(4, queryStart);
    }
    int latitudeEnd = geoURIWithoutQuery.indexOf(',');
    if (latitudeEnd < 0) {
      return null;
    }
    int longitudeEnd = geoURIWithoutQuery.indexOf(',', latitudeEnd + 1);    
    double latitude;
    double longitude;
    double altitude;
    try {
      latitude = Double.parseDouble(geoURIWithoutQuery.substring(0, latitudeEnd));
      if (latitude > 90.0 || latitude < -90.0) {
        return null;
      }
      if (longitudeEnd < 0) {
        longitude = Double.parseDouble(geoURIWithoutQuery.substring(latitudeEnd + 1));
        altitude = 0.0;
      } else {
        longitude = Double.parseDouble(geoURIWithoutQuery.substring(latitudeEnd + 1, longitudeEnd));
        altitude = Double.parseDouble(geoURIWithoutQuery.substring(longitudeEnd + 1));
      }
      if (longitude > 180.0 || longitude < -180.0 || altitude < 0) {
        return null;
      }
    } catch (NumberFormatException nfe) {
      return null;
    }
    return new GeoParsedResult(latitude, longitude, altitude, query);
  }

}