/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.common;
  
  import java.text.MessageFormat;
  import java.util.Locale;
  
  /**
   * @author shermann
   *
   */
  public class MCRGeoUtilities {
  
      /**
       * Converts coordinates to decimal degree (as used by google maps).
       * 
       */
      public static double toDecimalDegrees(int degree, int minutes, double seconds) {
          return (((seconds / 60) + minutes) / 60) + degree;
      }
  
      /**
       * Converts coordinates in pica format to decimal degree (as used by google maps).
       *
       * @return the decimal degree representation of the coordinates
       */
      public static double toDecimalDegrees(String picaValue) {
          if (picaValue == null || picaValue.length() == 0 || (!isValid(picaValue))) {
              return 0d;
          }
          String[] strings = picaValue.split(" ");
          if (strings.length < 3) {
              return 0d;
          }
  
          int degree = Integer.valueOf(strings[1]);
          int minutes = Integer.valueOf(strings[2]);
          double seconds = 0d;
  
          if (strings.length >= 4) {
              seconds = Double.valueOf(strings[3]);
          }
  
          int factor = "W".equals(strings[0]) || "S".equals(strings[0]) ? -1 : 1;
          return ((((seconds / 60) + minutes) / 60) + degree) * factor;
      }
  
      /**
       * Converts decimal degree to ordinary coordinates.
       * 
       */
      public static String toDegreeMinuteSecond(double inDecimalDegree) {
          int degree = (int) inDecimalDegree;
          int minutes = (int) ((inDecimalDegree - degree) * 60);
          double seconds = ((inDecimalDegree - degree) * 60 - minutes) * 60;
  
          return new MessageFormat("{0}° {1}'' {2}", Locale.ROOT).format(
              new Object[] { degree, minutes, Math.round(seconds * 100d / 100d) });
      }
  
      /**
       * @param picaValue the value as stored in opac/pica
       * @return a human readable form like 38° 22′ S
       * 
       * @see #toDegreeMinuteSecond(double)
       */
      public static String toDegreeMinuteSecond(String picaValue) {
          if (picaValue == null || picaValue.length() == 0 || (!isValid(picaValue))) {
              return null;
          }
          String[] strings = picaValue.split(" ");
          if (strings.length < 3) {
              return null;
          }
          double seconds = 0d;
  
          if (strings.length >= 4) {
              seconds = Double.valueOf(strings[3]);
          }
  
          return new MessageFormat("{0}° {1}'' {2} {3}", Locale.ROOT).format(
              new Object[] { Integer.valueOf(strings[1]), Integer.valueOf(strings[2]), Math.round(seconds * 100d / 100d),
                  strings[0] });
     }
 
     /**
      * @param picaValue
      * @return
      */
     private static boolean isValid(String picaValue) {
         String regex = "[EWSN]{1}\\s[0-9]{3}\\s[0-9]{2}(\\s[0-9]*)*";
         return picaValue.matches(regex);
     }
 }