/* Copyright 2002-2025 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.cdm;
  
  import org.orekit.errors.OrekitException;
  import org.orekit.errors.OrekitMessages;
  import org.orekit.files.ccsds.definitions.TimeSystem;
  import org.orekit.files.ccsds.section.HeaderKey;
  import org.orekit.files.ccsds.utils.ContextBinding;
  import org.orekit.files.ccsds.utils.lexical.ParseToken;
  import org.orekit.files.ccsds.utils.lexical.TokenType;
  import org.orekit.files.ccsds.utils.parsing.ProcessingState;
  
  /** {@link ProcessingState} for {@link CdmHeader CDM header}.
   * @author Melina Vanel
   * @since 11.2
   */
  public class CdmHeaderProcessingState implements ProcessingState {
  
      /** Context binding for header. */
      private final ContextBinding context;
  
      /** Parser for the complete message. */
      private final CdmParser parser;
  
      /** Simple constructor.
       * @param parser parser for the complete message
       */
      public CdmHeaderProcessingState(final CdmParser parser) {
          this.context = new ContextBinding(
              parser::getConventions, parser::isSimpleEOP,
              parser::getDataContext, parser::getParsedUnitsBehavior, () -> null,
              () -> TimeSystem.UTC, () -> 0.0, () -> 1.0);
          this.parser  = parser;
      }
  
      /** {@inheritDoc} */
      @Override
      public boolean processToken(final ParseToken token) {
  
          parser.inHeader();
  
          if (Double.isNaN(parser.getHeader().getFormatVersion())) {
              // the first thing we expect is the format version
              // (however, in XML files it was already set before entering header)
              if (parser.getFormatVersionKey() != null &&
                  parser.getFormatVersionKey().equals(token.getName()) &&
                  token.getType() == TokenType.ENTRY) {
                  parser.getHeader().setFormatVersion(token.getContentAsDouble());
                  return true;
              } else {
                  throw new OrekitException(OrekitMessages.UNSUPPORTED_FILE_FORMAT, token.getFileName());
              }
          }
  
          try {
              return token.getName() != null &&
                     HeaderKey.valueOf(token.getName()).process(token, context, parser.getHeader());
          } catch (IllegalArgumentException iaeH) {
  
              try {
                  return CdmHeaderKey.valueOf(token.getName()).process(token, context, parser.getHeader());
              } catch (IllegalArgumentException iaeC) {
                  // token has not been recognized
                  return false;
              }
  
          }
  
      }
  
  }