package au.gov.amsa.ais.message;
   
   import static au.gov.amsa.ais.Util.areEqual;
   
   import au.gov.amsa.ais.AisExtractor;
   import au.gov.amsa.ais.AisExtractorFactory;
   import au.gov.amsa.ais.AisMessage;
   import au.gov.amsa.ais.AisMessageType;
   import au.gov.amsa.ais.HasMmsi;
  import au.gov.amsa.ais.Util;
  
  /**
   * Decoder for AIS Aid to Navigation data (message type 21).
   * 
   * @author pxg
   * 
   */
  public class AisAidToNavigation implements AisMessage, HasMmsi {
  
      private static final Integer LONGITUDE_NOT_AVAILABLE = 181 * 600000; // 108600000;
      private static final Integer LATITUDE_NOT_AVAILABLE = 91 * 600000; // 54600000;
      private final AisExtractor extractor;
      private final String source;
      private final int messageId;
      private final int repeatIndicator;
      private final int mmsi;
      private final String name;
      private final int dimensionA;
      private final int dimensionB;
      private final int dimensionC;
      private final int dimensionD;
      private final int typeOfElectronicPositionFixingDevice;
      private final boolean isHighAccuracyPosition;
      private final boolean isVirtualAtoN;
      private final boolean isAtonOff;
      private final boolean isAtonInAssignedMode;
      private final Double longitude;
      private final Double latitude;
      private final int timeSecondsOnly;
      private final String atonStatus;
      private final int atonType;
      private final boolean isUsingRAIM;
  
      public AisAidToNavigation(String message, String source, int padBits) {
          this(Util.getAisExtractorFactory(), message, source, padBits);
      }
  
      private AisAidToNavigation(AisExtractorFactory factory, String message, String source,
              int padBits) {
          this.source = source;
          extractor = factory.create(message, 172, padBits);
          messageId = extractor.getValue(0, 6);
          Util.checkMessageId(getMessageId(), AisMessageType.ATON_REPORT);
          repeatIndicator = extractor.getValue(6, 8);
          mmsi = extractor.getValue(8, 38);
          atonType = extractor.getValue(38, 43);
          name = extractor.getString(43, 163);
          isHighAccuracyPosition = areEqual(extractor.getValue(163, 164), 1);
          longitude = extractLongitude(extractor);
          latitude = extractLatitude(extractor);
          dimensionA = extractor.getValue(219, 228);
          dimensionB = extractor.getValue(228, 237);
          dimensionC = extractor.getValue(237, 243);
          dimensionD = extractor.getValue(243, 249);
          typeOfElectronicPositionFixingDevice = extractor.getValue(249, 253);
          timeSecondsOnly = extractor.getValue(253, 259);
          isAtonOff = areEqual(extractor.getValue(259, 260), 1);
          atonStatus = extractor.getString(260, 268);
          isUsingRAIM = Util.areEqual(extractor.getValue(268, 269), 1);
          isVirtualAtoN = areEqual(extractor.getValue(269, 270), 1);
          isAtonInAssignedMode = areEqual(extractor.getValue(270, 271), 1);
      }
  
      @Override
      public int getMessageId() {
          return messageId;
      }
  
      public int getRepeatIndicator() {
          return repeatIndicator;
      }
  
      @Override
      public int getMmsi() {
          return mmsi;
      }
  
      public boolean isHighAccuracyPosition() {
          return isHighAccuracyPosition;
      }
  
      public boolean isVirtualAtoN() {
          return isVirtualAtoN;
      }
  
      public boolean isAtonOff() {
          return isAtonOff;
      }
  
     public boolean isAtonInAssignedMode() {
         return isAtonInAssignedMode;
     }
 
     public String getAtonStatus() {
         return atonStatus;
     }
 
     public String getName() {
         return name;
     }
 
     public int getAtoNType() {
         return atonType;
     }
 
     public int getDimensionA() {
         return dimensionA;
     }
 
     public int getDimensionB() {
         return dimensionB;
     }
 
     public int getDimensionC() {
         return dimensionC;
     }
 
     public int getDimensionD() {
         return dimensionD;
     }
 
     public int getLengthMetres() {
         return getDimensionA() + getDimensionB();
     }
 
     public int getWidthMetres() {
         return getDimensionC() + getDimensionD();
     }
 
     public int getTypeOfElectronicPositionFixingDevice() {
         return typeOfElectronicPositionFixingDevice;
     }
 
     @Override
     public String getSource() {
         return source;
     }
 
     static Double extractLongitude(AisExtractor extractor) {
         int val = extractor.getSignedValue(164, 192);
         if (val == LONGITUDE_NOT_AVAILABLE) {
             return null;
         } else {
             Util.checkLong(val / 600000.0);
             return val / 600000.0;
         }
 
     }
 
     static Double extractLatitude(AisExtractor extractor) {
         int val = extractor.getSignedValue(192, 219);
         if (val == LATITUDE_NOT_AVAILABLE) {
             return null;
         } else {
             Util.checkLat(val / 600000.0);
             return val / 600000.0;
         }
     }
 
     public Double getLongitude() {
         return longitude;
     }
 
     public Double getLatitude() {
         return latitude;
     }
 
     public int getTimeSecondsOnly() {
         return timeSecondsOnly;
     }
 
     public boolean isUsingRAIM() {
         return isUsingRAIM;
     }
 
     @Override
     public String toString() {
         StringBuilder builder = new StringBuilder();
         builder.append("AisAidToNavigation [source=");
         builder.append(source);
         builder.append(", messageId=");
         builder.append(messageId);
         builder.append(", repeatIndicator=");
         builder.append(repeatIndicator);
         builder.append(", mmsi=");
         builder.append(mmsi);
         builder.append(", atonType=");
         builder.append(atonType);
         builder.append(", atonStatus=");
         builder.append(atonStatus);
         builder.append(", name=");
         builder.append(name);
         builder.append(", isHighAccuracyPosition=");
         builder.append(isHighAccuracyPosition);
         builder.append(", longitude=");
         builder.append(longitude);
         builder.append(", latitude=");
         builder.append(latitude);
         builder.append(", dimensionA=");
         builder.append(dimensionA);
         builder.append(", dimensionB=");
         builder.append(dimensionB);
         builder.append(", dimensionC=");
         builder.append(dimensionC);
         builder.append(", dimensionD=");
         builder.append(dimensionD);
         builder.append(", typeOfElectronicPositionFixingDevice=");
         builder.append(typeOfElectronicPositionFixingDevice);
         builder.append(", timeSecondsOnly=");
         builder.append(timeSecondsOnly);
         builder.append(", isAtonOff=");
         builder.append(isAtonOff);
         builder.append(", isUsingRAIM=");
         builder.append(isUsingRAIM);
         builder.append(", isVirtualAtoN=");
         builder.append(isVirtualAtoN);
         builder.append(", isAtonInAssignedMode=");
         builder.append(isAtonInAssignedMode);
         builder.append("]");
         return builder.toString();
     }
 
 }