/* Copyright 2022-2026 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.ccsds.ndm.adm.acm;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.orekit.attitudes.BoundedAttitudeProvider;
  import org.orekit.attitudes.TabulatedProvider;
  import org.orekit.files.ccsds.utils.Initializer;
  import org.orekit.files.general.AttitudeEphemerisFile;
  import org.orekit.frames.Frame;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.utils.AngularDerivativesFilter;
  import org.orekit.utils.TimeStampedAngularCoordinates;
  
  /** Attitude state history.
   * @author Luc Maisonobe
   * @since 12.0
   */
  public class AttitudeStateHistory implements AttitudeEphemerisFile.AttitudeEphemerisSegment<TimeStampedAngularCoordinates> {
  
      /** Metadata. */
      private final AttitudeStateHistoryMetadata metadata;
  
      /** Trajectory states. */
      private final List<AttitudeState> states;
  
      /** Simple constructor.
       * @param metadata metadata
       * @param states attitude states
       */
      public AttitudeStateHistory(final AttitudeStateHistoryMetadata metadata,
                                  final List<AttitudeState> states) {
          this.metadata = metadata;
          this.states   = Initializer.emptyListIfNull(states);
      }
  
      /** Get metadata.
       * @return metadata
       */
      public AttitudeStateHistoryMetadata getMetadata() {
          return metadata;
      }
  
      /** Get the attitude states.
       * @return attitude states
       */
      public List<AttitudeState> getAttitudeStates() {
          return Collections.unmodifiableList(states);
      }
  
      /** {@inheritDoc} */
      @Override
      public Frame getReferenceFrame() {
          return metadata.getEndpoints().getFrameMapper()
                  .buildCcsdsFrame(metadata.getEndpoints().getFrameA(), null);
      }
  
      /** {@inheritDoc} */
      @Override
      public int getInterpolationSamples() {
          return 1;
      }
  
      /** {@inheritDoc} */
      @Override
      public String getInterpolationMethod() {
          return "linear";
      }
  
      /** {@inheritDoc} */
      @Override
      public AngularDerivativesFilter getAvailableDerivatives() {
          return states.getFirst().getAvailableDerivatives();
      }
  
      /** {@inheritDoc} */
      @Override
      public BoundedAttitudeProvider getAttitudeProvider() {
          return new TabulatedProvider(getAngularCoordinates(), getInterpolationSamples(),
                                       getAvailableDerivatives(), getStart(), getStop(),
                                       getMetadata().getEndpoints());
     }
 
     /** {@inheritDoc} */
     @Override
     public AbsoluteDate getStart() {
         return states.getFirst().getDate();
     }
 
     /** {@inheritDoc} */
     @Override
     public AbsoluteDate getStop() {
         return states.getLast().getDate();
     }
 
     /** {@inheritDoc} */
     @Override
     public List<TimeStampedAngularCoordinates> getAngularCoordinates() {
         return states.stream().map(os -> os.toAngular(metadata.getEulerRotSeq().orElse(null))).collect(Collectors.toList());
     }
 
 }