/* Copyright 2002-2026 CS GROUP
    * 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.ccsds.ndm.odm.ocm;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Optional;
  
  import org.orekit.annotation.Nullable;
  import org.orekit.files.ccsds.definitions.OdMethodFacade;
  import org.orekit.files.ccsds.section.CommentsContainer;
  import org.orekit.time.AbsoluteDate;
  
  /** Orbit determination data.
   * <p>
   * Beware that the Orekit getters and setters all rely on SI units. The parsers
   * and writers take care of converting these SI units into CCSDS mandatory units.
   * The {@link org.orekit.utils.units.Unit Unit} class provides useful
   * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
   * {@link org.orekit.utils.units.Unit#toSI(double) toSI} methods in case the callers
   * already use CCSDS units instead of the API SI units. The general-purpose
   * {@link org.orekit.utils.units.Unit Unit} class (without an 's') and the
   * CCSDS-specific {@link org.orekit.files.ccsds.definitions.Units Units} class
   * (with an 's') also provide some predefined units. These predefined units and the
   * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
   * {@link org.orekit.utils.units.Unit#toSI(double) toSI} conversion methods are indeed
   * what the parsers and writers use for the conversions.
   * </p>
   * @author Luc Maisonobe
   * @since 11.0
   */
  public class OrbitDetermination extends CommentsContainer {
  
      /** Identification number. */
      private String id;
  
      /** Identification of previous orbit determination. */
      @Nullable
      private String prevId;
  
      /** Orbit determination method. */
      private OdMethodFacade method;
  
      /** Time tag for orbit determination solved-for state. */
      private AbsoluteDate epoch;
  
      /** Time elapsed between first accepted observation on epoch. */
      @Nullable
      private Double timeSinceFirstObservation;
  
      /** Time elapsed between last accepted observation on epoch. */
      @Nullable
      private Double timeSinceLastObservation;
  
      /** Time span of observation recommended for the OD of the object. */
      @Nullable
      private Double recommendedOdSpan;
  
      /** Actual time span used for the OD of the object. */
      @Nullable
      private Double actualOdSpan;
  
      /** Number of observations available within the actual OD span. */
      @Nullable
      private Integer obsAvailable;
  
      /** Number of observations accepted within the actual OD span. */
      @Nullable
      private Integer obsUsed;
  
      /** Number of sensors tracks available for the OD within the actual OD span. */
      @Nullable
      private Integer tracksAvailable;
  
      /** Number of sensors tracks accepted for the OD within the actual OD span. */
      @Nullable
      private Integer tracksUsed;
  
      /** Maximum time between observations in the OD of the object. */
      @Nullable
      private Double maximumObsGap;
  
      /** Positional error ellipsoid 1σ major eigenvalue at the epoch of OD. */
      @Nullable
     private Double epochEigenMaj;
 
     /** Positional error ellipsoid 1σ intermediate eigenvalue at the epoch of OD. */
     @Nullable
     private Double epochEigenInt;
 
     /** Positional error ellipsoid 1σ minor eigenvalue at the epoch of OD. */
     @Nullable
     private Double epochEigenMin;
 
     /** Maximum predicted major eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM. */
     @Nullable
     private Double maxPredictedEigenMaj;
 
     /** Minimum predicted minor eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM. */
     @Nullable
     private Double minPredictedEigenMin;
 
     /** Confidence metric. */
     @Nullable
     private Double confidence;
 
     /** Generalize Dilution Of Precision. */
     @Nullable
     private Double gdop;
 
     /** Number of solved-for states. */
     @Nullable
     private Integer solveN;
 
     /** Description of state elements solved-for. */
     private List<String> solveStates;
 
     /** Number of consider parameters. */
     @Nullable
     private Integer considerN;
 
     /** Description of consider parameters. */
     private List<String> considerParameters;
 
     /** Specific Energy Dissipation Rate.
      * @since 12.0
      */
     @Nullable
     private Double sedr;
 
     /** Number of sensors used. */
     @Nullable
     private Integer sensorsN;
 
     /** Description of sensors used. */
     private List<String> sensors;
 
     /** Weighted RMS residual ratio. */
     @Nullable
     private Double weightedRms;
 
     /** Observation data types used. */
     private List<String> dataTypes;
 
     /** Simple constructor.
      */
     public OrbitDetermination() {
         solveStates        = Collections.emptyList();
         considerParameters = Collections.emptyList();
         sensors            = Collections.emptyList();
         dataTypes          = Collections.emptyList();
     }
 
     /** {@inheritDoc} */
     @Override
     public void validate(final double version) {
         super.validate(version);
         checkNotNull(id,     OrbitDeterminationKey.OD_ID.name());
         checkNotNull(method, OrbitDeterminationKey.OD_METHOD.name());
         checkNotNull(epoch,  OrbitDeterminationKey.OD_EPOCH.name());
     }
 
     /** Get identification number.
      * @return identification number
      */
     public String getId() {
         return id;
     }
 
     /** Set identification number.
      * @param id identification number
      */
     public void setId(final String id) {
         this.id = id;
     }
 
     /** Get identification of previous orbit determination.
      * @return identification of previous orbit determination
      */
     public Optional<String> getPrevId() {
         return Optional.ofNullable(prevId);
     }
 
     /** Set identification of previous orbit determination.
      * @param prevId identification of previous orbit determination
      */
     public void setPrevId(final String prevId) {
         this.prevId = prevId;
     }
 
     /** Get orbit determination method.
      * @return orbit determination method
      */
     public OdMethodFacade getMethod() {
         return method;
     }
 
     /** Set orbit determination method.
      * @param method orbit determination method
      */
     public void setMethod(final OdMethodFacade method) {
         this.method = method;
     }
 
     /** Get time tag for orbit determination solved-for state.
      * @return time tag for orbit determination solved-for state
      */
     public AbsoluteDate getEpoch() {
         return epoch;
     }
 
     /** Set time tag for orbit determination solved-for state.
      * @param epoch time tag for orbit determination solved-for state
      */
     public void setEpoch(final AbsoluteDate epoch) {
         this.epoch = epoch;
     }
 
     /** Get time elapsed between first accepted observation on epoch.
      * @return time elapsed between first accepted observation on epoch
      */
     public Optional<Double> getTimeSinceFirstObservation() {
         return Optional.ofNullable(timeSinceFirstObservation);
     }
 
     /** Set time elapsed between first accepted observation on epoch.
      * @param timeSinceFirstObservation time elapsed between first accepted observation on epoch
      */
     public void setTimeSinceFirstObservation(final double timeSinceFirstObservation) {
         this.timeSinceFirstObservation = timeSinceFirstObservation;
     }
 
     /** Get time elapsed between last accepted observation on epoch.
      * @return time elapsed between last accepted observation on epoch
      */
     public Optional<Double> getTimeSinceLastObservation() {
         return Optional.ofNullable(timeSinceLastObservation);
     }
 
     /** Set time elapsed between last accepted observation on epoch.
      * @param timeSinceLastObservation time elapsed between last accepted observation on epoch
      */
     public void setTimeSinceLastObservation(final double timeSinceLastObservation) {
         this.timeSinceLastObservation = timeSinceLastObservation;
     }
 
     /** Get time span of observation recommended for the OD of the object.
      * @return time span of observation recommended for the OD of the object
      */
     public Optional<Double> getRecommendedOdSpan() {
         return Optional.ofNullable(recommendedOdSpan);
     }
 
     /** Set time span of observation recommended for the OD of the object.
      * @param recommendedOdSpan time span of observation recommended for the OD of the object
      */
     public void setRecommendedOdSpan(final double recommendedOdSpan) {
         this.recommendedOdSpan = recommendedOdSpan;
     }
 
     /** Get actual time span used for the OD of the object.
      * @return actual time span used for the OD of the object
      */
     public Optional<Double> getActualOdSpan() {
         return Optional.ofNullable(actualOdSpan);
     }
 
     /** Set actual time span used for the OD of the object.
      * @param actualOdSpan actual time span used for the OD of the object
      */
     public void setActualOdSpan(final double actualOdSpan) {
         this.actualOdSpan = actualOdSpan;
     }
 
     /** Get number of observations available within the actual OD span.
      * @return number of observations available within the actual OD span
      */
     public Optional<Integer> getObsAvailable() {
         return Optional.ofNullable(obsAvailable);
     }
 
     /** Set number of observations available within the actual OD span.
      * @param obsAvailable number of observations available within the actual OD span
      */
     public void setObsAvailable(final Integer obsAvailable) {
         this.obsAvailable = obsAvailable;
     }
 
     /** Get number of observations accepted within the actual OD span.
      * @return number of observations accepted within the actual OD span
      */
     public Optional<Integer> getObsUsed() {
         return Optional.ofNullable(obsUsed);
     }
 
     /** Set number of observations accepted within the actual OD span.
      * @param obsUsed number of observations accepted within the actual OD span
      */
     public void setObsUsed(final Integer obsUsed) {
         this.obsUsed = obsUsed;
     }
 
     /** Get number of sensors tracks available for the OD within the actual OD span.
      * @return number of sensors tracks available for the OD within the actual OD span
      */
     public Optional<Integer> getTracksAvailable() {
         return Optional.ofNullable(tracksAvailable);
     }
 
     /** Set number of sensors tracks available for the OD within the actual OD span.
      * @param tracksAvailable number of sensors tracks available for the OD within the actual OD span
      */
     public void setTracksAvailable(final Integer tracksAvailable) {
         this.tracksAvailable = tracksAvailable;
     }
 
     /** Get number of sensors tracks accepted for the OD within the actual OD span.
      * @return number of sensors tracks accepted for the OD within the actual OD span
      */
     public Optional<Integer> getTracksUsed() {
         return Optional.ofNullable(tracksUsed);
     }
 
     /** Set number of sensors tracks accepted for the OD within the actual OD span.
      * @param tracksUsed number of sensors tracks accepted for the OD within the actual OD span
      */
     public void setTracksUsed(final Integer tracksUsed) {
         this.tracksUsed = tracksUsed;
     }
 
     /** Get maximum time between observations in the OD of the object.
      * @return maximum time between observations in the OD of the object
      */
     public Optional<Double> getMaximumObsGap() {
         return Optional.ofNullable(maximumObsGap);
     }
 
     /** Set maximum time between observations in the OD of the object.
      * @param maximumObsGap maximum time between observations in the OD of the object
      */
     public void setMaximumObsGap(final double maximumObsGap) {
         this.maximumObsGap = maximumObsGap;
     }
 
     /** Get positional error ellipsoid 1σ major eigenvalue at the epoch of OD.
      * @return positional error ellipsoid 1σ major eigenvalue at the epoch of OD
      */
     public Optional<Double> getEpochEigenMaj() {
         return Optional.ofNullable(epochEigenMaj);
     }
 
     /** Set positional error ellipsoid 1σ major eigenvalue at the epoch of OD.
      * @param epochEigenMaj positional error ellipsoid 1σ major eigenvalue at the epoch of OD
      */
     public void setEpochEigenMaj(final double epochEigenMaj) {
         this.epochEigenMaj = epochEigenMaj;
     }
 
     /** Get positional error ellipsoid 1σ intermediate eigenvalue at the epoch of OD.
      * @return positional error ellipsoid 1σ intermediate eigenvalue at the epoch of OD
      */
     public Optional<Double> getEpochEigenInt() {
         return Optional.ofNullable(epochEigenInt);
     }
 
     /** Set positional error ellipsoid 1σ intermediate eigenvalue at the epoch of OD.
      * @param epochEigenInt positional error ellipsoid 1σ intermediate eigenvalue at the epoch of OD
      */
     public void setEpochEigenInt(final double epochEigenInt) {
         this.epochEigenInt = epochEigenInt;
     }
 
     /** Get positional error ellipsoid 1σ minor eigenvalue at the epoch of OD.
      * @return positional error ellipsoid 1σ minor eigenvalue at the epoch of OD
      */
     public Optional<Double> getEpochEigenMin() {
         return Optional.ofNullable(epochEigenMin);
     }
 
     /** Set positional error ellipsoid 1σ minor eigenvalue at the epoch of OD.
      * @param epochEigenMin positional error ellipsoid 1σ minor eigenvalue at the epoch of OD
      */
     public void setEpochEigenMin(final double epochEigenMin) {
         this.epochEigenMin = epochEigenMin;
     }
 
     /** Get maximum predicted major eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM.
      * @return maximum predicted major eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM
      */
     public Optional<Double> getMaxPredictedEigenMaj() {
         return Optional.ofNullable(maxPredictedEigenMaj);
     }
 
     /** Set maximum predicted major eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM.
      * @param maxPredictedEigenMaj maximum predicted major eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM
      */
     public void setMaxPredictedEigenMaj(final double maxPredictedEigenMaj) {
         this.maxPredictedEigenMaj = maxPredictedEigenMaj;
     }
 
     /** Get minimum predicted minor eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM.
      * @return minimum predicted v eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM
      */
     public Optional<Double> getMinPredictedEigenMin() {
         return Optional.ofNullable(minPredictedEigenMin);
     }
 
     /** Set minimum predicted minor eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM.
      * @param minPredictedEigenMin minimum predicted minor eigenvalue of 1σ positional error ellipsoid over entire time span of the OCM
      */
     public void setMinPredictedEigenMin(final double minPredictedEigenMin) {
         this.minPredictedEigenMin = minPredictedEigenMin;
     }
 
     /** Get confidence metric.
      * @return confidence metric
      */
     public Optional<Double> getConfidence() {
         return Optional.ofNullable(confidence);
     }
 
     /** Set confidence metric.
      * @param confidence confidence metric
      */
     public void setConfidence(final double confidence) {
         this.confidence = confidence;
     }
 
     /** Get generalize Dilution Of Precision.
      * @return generalize Dilution Of Precision
      */
     public Optional<Double> getGdop() {
         return Optional.ofNullable(gdop);
     }
 
     /** Set generalize Dilution Of Precision.
      * @param gdop generalize Dilution Of Precision
      */
     public void setGdop(final double gdop) {
         this.gdop = gdop;
     }
 
     /** Get number of solved-for states.
      * @return number of solved-for states
      */
     public Optional<Integer> getSolveN() {
         return Optional.ofNullable(solveN);
     }
 
     /** Set number of solved-for states.
      * @param solveN number of solved-for states
      */
     public void setSolveN(final Integer solveN) {
         this.solveN = solveN;
     }
 
     /** Get description of state elements solved-for.
      * @return description of state elements solved-for
      */
     public List<String> getSolveStates() {
         return solveStates;
     }
 
     /** Set description of state elements solved-for.
      * @param solveStates description of state elements solved-for
      */
     public void setSolveStates(final List<String> solveStates) {
         this.solveStates = solveStates;
     }
 
     /** Get number of consider parameters.
      * @return number of consider parameters
      */
     public Optional<Integer> getConsiderN() {
         return Optional.ofNullable(considerN);
     }
 
     /** Set number of consider parameters.
      * @param considerN number of consider parameters
      */
     public void setConsiderN(final Integer considerN) {
         this.considerN = considerN;
     }
 
     /** Get description of consider parameters.
      * @return description of consider parameters
      */
     public List<String> getConsiderParameters() {
         return considerParameters;
     }
 
     /** Set description of consider parameters.
      * @param considerParameters description of consider parameters
      */
     public void setConsiderParameters(final List<String> considerParameters) {
         this.considerParameters = considerParameters;
     }
 
     /** Get Specific Energy Dissipation Rate.
      * @return Specific Energy Dissipation Rate
      * @since 12.0
      */
     public Optional<Double> getSedr() {
         return Optional.ofNullable(sedr);
     }
 
     /** Set Specific Energy Dissipation Rate.
      * @param sedr Specific Energy Dissipation Rate (W/kg)
      * @since 12.0
      */
     public void setSedr(final double sedr) {
         this.sedr = sedr;
     }
 
     /** Get number of sensors used.
      * @return number of sensors used
      */
     public Optional<Integer> getSensorsN() {
         return Optional.ofNullable(sensorsN);
     }
 
     /** Set number of sensors used.
      * @param sensorsN number of sensors used
      */
     public void setSensorsN(final Integer sensorsN) {
         this.sensorsN = sensorsN;
     }
 
     /** Get description of sensors used.
      * @return description of sensors used
      */
     public List<String> getSensors() {
         return sensors;
     }
 
     /** Set description of sensors used.
      * @param sensors description of sensors used
      */
     public void setSensors(final List<String> sensors) {
         this.sensors = sensors;
     }
 
     /** Get weighted RMS residual ratio.
      * @return weighted RMS residual ratio
      */
     public Optional<Double> getWeightedRms() {
         return Optional.ofNullable(weightedRms);
     }
 
     /** Set weighted RMS residual ratio.
      * @param weightedRms weighted RMS residual ratio
      */
     public void setWeightedRms(final double weightedRms) {
         this.weightedRms = weightedRms;
     }
 
     /** Get observation data types used.
      * @return observation data types used
      */
     public List<String> getDataTypes() {
         return dataTypes;
     }
 
     /** Set observation data types used.
      * @param dataTypes observation data types used
      */
     public void setDataTypes(final List<String> dataTypes) {
         this.dataTypes = dataTypes;
     }
 
 }