/* Copyright 2022-2025 Luc Maisonobe
    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS licenses this file to You 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.orekit.files.sinex;
  
  import org.orekit.gnss.MeasurementType;
  import org.orekit.gnss.ObservationType;
  import org.orekit.gnss.SatInSystem;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.utils.Constants;
  
  import java.util.function.Predicate;
  
  /** Predicates for bias solution blocks.
   * @author Luc Maisonobe
   * @since 13.0
   */
  enum BiasSolutionPredicate implements Predicate<SinexBiasParseInfo> {
  
      /** Predicate for DSB line. */
      DSB {
          /** {@inheritDoc} */
          @Override
          protected void store(final SinexBiasParseInfo parseInfo,
                               final String svn, final SatInSystem satId, final String siteCode,
                               final ObservationType obs1, final ObservationType obs2,
                               final AbsoluteDate start, final AbsoluteDate end,
                               final double bias) {
              if (siteCode.isEmpty()) {
                  // this is a satellite bias
                  final SatelliteDifferentialSignalBias dsb = parseInfo.getSatelliteDsb(satId);
                  dsb.getDsb().addBias(obs1, obs2, start, end, bias);
              } else {
                  // this is a station bias
                  final StationDifferentialSignalBias dsb = parseInfo.getStationDsb(siteCode);
                  dsb.getDsb(satId.getSystem()).addBias(obs1, obs2, start, end, bias);
              }
          }
      },
  
      /** Predicate for OSB line. */
      OSB {
          /** {@inheritDoc} */
          @Override
          protected void store(final SinexBiasParseInfo parseInfo,
                               final String svn, final SatInSystem satId, final String siteCode,
                               final ObservationType obs1, final ObservationType obs2,
                               final AbsoluteDate start, final AbsoluteDate end,
                               final double bias) {
              if (siteCode.isEmpty()) {
                  // this is a satellite bias
                  final SatelliteObservableSpecificSignalBias osb = parseInfo.getSatelliteOsb(satId);
                  osb.getOsb().addBias(obs1, start, end, bias);
              } else {
                  // this is a station bias
                  final StationObservableSpecificSignalBias osb = parseInfo.getStationOsb(siteCode);
                  osb.getOsb(satId.getSystem()).addBias(obs1, start, end, bias);
              }
          }
      };
  
      /** {@inheritDoc} */
      @Override
      public boolean test(final SinexBiasParseInfo parseInfo) {
          if (name().equals(parseInfo.parseString(1, 3))) {
              // this is the data type we are concerned with
              final String          svn      = parseInfo.parseString(6, 4);
              final SatInSystem     satId    = new SatInSystem(parseInfo.parseString(11, 3));
              final String          siteCode = parseInfo.parseString(15, 9);
              final ObservationType obs1     = parseInfo.parseObservationType(satId.getSystem(), 25, 4);
              final ObservationType obs2     = parseInfo.parseObservationType(satId.getSystem(), 30, 4);
              final AbsoluteDate    start    = parseInfo.stringEpochToAbsoluteDate(parseInfo.parseString(35, 14), true);
              final AbsoluteDate    end      = parseInfo.stringEpochToAbsoluteDate(parseInfo.parseString(50, 14), false);
  
              // code biases are in time units (ns converted to seconds by parseDoubleWithUnit),
              // they must be converted to meters
              // phase biases are in cycles, no conversion is needed for them
              final double          factor   =
                  obs1.getMeasurementType() == MeasurementType.PSEUDO_RANGE ? Constants.SPEED_OF_LIGHT :  1;
              final double          bias     = factor * parseInfo.parseDoubleWithUnit(65, 4, 70, 21);
  
              store(parseInfo, svn, satId, siteCode, obs1, obs2, start, end, bias);
              return true;
          } else {
              // it is a data type for another predicate
              return false;
         }
     }
 
     /** Store parsed fields.
      * @param parseInfo container for parse info
      * @param svn satellite SVN
      * @param satId satellite identifier
      * @param siteCode station site code
      * @param obs1 code of first observable
      * @param obs2 code of second observable
      * @param start validity start date
      * @param end validity end date
      * @param bias estimated bias
      */
     protected abstract void store(SinexBiasParseInfo parseInfo,
                                   String svn, SatInSystem satId, String siteCode,
                                   ObservationType obs1, ObservationType obs2,
                                   AbsoluteDate start, AbsoluteDate end,
                                   double bias);
 
 }