/* Copyright 2002-2024 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.io.IOException;
  import java.util.List;
  
  import org.hipparchus.linear.DiagonalMatrix;
  import org.orekit.files.ccsds.definitions.TimeConverter;
  import org.orekit.files.ccsds.section.AbstractWriter;
  import org.orekit.files.ccsds.utils.FileFormat;
  import org.orekit.files.ccsds.utils.generation.Generator;
  import org.orekit.utils.AccurateFormatter;
  import org.orekit.utils.units.Unit;
  
  /** Writer for covariance history data.
   * @author Luc Maisonobe
   * @since 12.0
   */
  class AttitudeCovarianceHistoryWriter extends AbstractWriter {
  
      /** Covariance history block. */
      private final AttitudeCovarianceHistory history;
  
      /** Converter for dates. */
      private final TimeConverter timeConverter;
  
      /** Create a writer.
       * @param covarianceHistory covariance history to write
       * @param timeConverter converter for dates
       */
      AttitudeCovarianceHistoryWriter(final AttitudeCovarianceHistory covarianceHistory,
                                      final TimeConverter timeConverter) {
          super(AcmDataSubStructureKey.cov.name(), AcmDataSubStructureKey.COV.name());
          this.history       = covarianceHistory;
          this.timeConverter = timeConverter;
      }
  
      /** {@inheritDoc} */
      @Override
      protected void writeContent(final Generator generator) throws IOException {
  
          // covariance history block
          final AttitudeCovarianceHistoryMetadata metadata = history.getMetadata();
          generator.writeComments(metadata.getComments());
  
          // identifiers
          generator.writeEntry(AttitudeCovarianceHistoryMetadataKey.COV_ID.name(),       metadata.getCovID(),      null, false);
          generator.writeEntry(AttitudeCovarianceHistoryMetadataKey.COV_PREV_ID.name(),  metadata.getCovPrevID(),  null, false);
          generator.writeEntry(AttitudeCovarianceHistoryMetadataKey.COV_BASIS.name(),    metadata.getCovBasis(),   null, false);
          generator.writeEntry(AttitudeCovarianceHistoryMetadataKey.COV_BASIS_ID.name(), metadata.getCovBasisID(), null, false);
  
          // references
          if (metadata.getCovReferenceFrame() != null) {
              generator.writeEntry(AttitudeCovarianceHistoryMetadataKey.COV_REF_FRAME.name(), metadata.getCovReferenceFrame().getName(), null, false);
          }
  
          // elements
          generator.writeEntry(AttitudeCovarianceHistoryMetadataKey.COV_TYPE.name(), metadata.getCovType(), false);
  
          // data
          final List<Unit> units = metadata.getCovType().getUnits();
          for (final AttitudeCovariance covariance : history.getCovariances()) {
              final DiagonalMatrix matrix = covariance.getMatrix();
              final StringBuilder  line   = new StringBuilder();
              line.append(generator.dateToString(timeConverter, covariance.getDate()));
              for (int k = 0; k < units.size(); ++k) {
                  line.append(' ');
                  line.append(AccurateFormatter.format(units.get(k).fromSI(matrix.getEntry(k, k))));
              }
              if (generator.getFormat() == FileFormat.XML) {
                  generator.writeEntry(Acm.COV_LINE, line.toString(), null, true);
              } else {
                  generator.writeRawData(line);
                  generator.newLine();
              }
  
          }
  
      }
  
  }