/*
    * Themis: Java Project Framework
    * Copyright 2012-2026. Tony Washer
    *
    * Licensed 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 io.github.tonywasher.joceanus.themis.lethe.analysis;
  
  import io.github.tonywasher.joceanus.oceanus.base.OceanusException;
  import io.github.tonywasher.joceanus.themis.lethe.analysis.ThemisAnalysisContainer.ThemisAnalysisAdoptable;
  import io.github.tonywasher.joceanus.themis.lethe.analysis.ThemisAnalysisIf.ThemisIteratorChain;
  import io.github.tonywasher.joceanus.themis.lethe.analysis.ThemisAnalysisStatement.ThemisAnalysisStatementHolder;
  
  import java.util.ArrayDeque;
  import java.util.Collections;
  import java.util.Deque;
  import java.util.Iterator;
  
  /**
   * Else construct.
   */
  public class ThemisAnalysisElse
          implements ThemisAnalysisContainer, ThemisAnalysisAdoptable, ThemisAnalysisStatementHolder {
      /**
       * The parent.
       */
      private ThemisAnalysisContainer theParent;
  
      /**
       * The condition.
       */
      private final ThemisAnalysisStatement theCondition;
  
      /**
       * The contents.
       */
      private final Deque<ThemisAnalysisElement> theContents;
  
      /**
       * The else clause(s).
       */
      private final ThemisAnalysisElse theElse;
  
      /**
       * The number of lines.
       */
      private final int theNumLines;
  
      /**
       * The dataMap.
       */
      private final ThemisAnalysisDataMap theDataMap;
  
      /**
       * Constructor.
       *
       * @param pParser the parser
       * @param pOwner  the owning if
       * @param pLine   the initial else line
       * @throws OceanusException on error
       */
      ThemisAnalysisElse(final ThemisAnalysisParser pParser,
                         final ThemisAnalysisContainer pOwner,
                         final ThemisAnalysisLine pLine) throws OceanusException {
          /* Record the parent */
          theParent = pOwner;
          theDataMap = new ThemisAnalysisDataMap(theParent.getDataMap());
  
          /* Strip any if token */
          pLine.stripStartSequence(ThemisAnalysisKeyWord.IF.getKeyWord());
  
          /* Parse the condition */
          final Deque<ThemisAnalysisElement> myHeaders = ThemisAnalysisBuilder.parseHeaders(pParser, pLine);
          theNumLines = myHeaders.size() + 1;
          theCondition = new ThemisAnalysisStatement(myHeaders);
  
          /* Parse the body */
          final Deque<ThemisAnalysisElement> myLines = ThemisAnalysisBuilder.processBody(pParser);
  
          /* Look for else clauses */
          theElse = (ThemisAnalysisElse) pParser.processExtra(pOwner, ThemisAnalysisKeyWord.ELSE);
  
          /* Create a parser */
          theContents = new ArrayDeque<>();
          final ThemisAnalysisParser myParser = new ThemisAnalysisParser(myLines, theContents, this);
          myParser.processLines();
      }
  
      @Override
     public Deque<ThemisAnalysisElement> getContents() {
         return theContents;
     }
 
     @Override
     public Iterator<ThemisAnalysisStatement> statementIterator() {
         final Iterator<ThemisAnalysisStatement> myLocal = theCondition.nullParameters()
                 ? Collections.emptyIterator()
                 : Collections.singleton(theCondition).iterator();
         return theElse == null ? myLocal : new ThemisIteratorChain<>(myLocal, theElse.statementIterator());
     }
 
     @Override
     public Iterator<ThemisAnalysisContainer> containerIterator() {
         return theElse == null
                 ? Collections.emptyIterator()
                 : Collections.singleton((ThemisAnalysisContainer) theElse).iterator();
     }
 
     @Override
     public ThemisAnalysisContainer getParent() {
         return theParent;
     }
 
     @Override
     public void setParent(final ThemisAnalysisContainer pParent) {
         theParent = pParent;
         theDataMap.setParent(pParent.getDataMap());
         if (theElse != null) {
             theElse.setParent(pParent);
         }
     }
 
     @Override
     public ThemisAnalysisDataMap getDataMap() {
         return theDataMap;
     }
 
     @Override
     public void postProcessExtras() throws OceanusException {
         /* Process the else clause if required */
         if (theElse != null) {
             theElse.postProcessLines();
         }
     }
 
     /**
      * Obtain the additional else clause (if any).
      *
      * @return the else clause
      */
     public ThemisAnalysisElse getElse() {
         return theElse;
     }
 
     @Override
     public int getNumLines() {
         return theNumLines;
     }
 
     @Override
     public String toString() {
         return theCondition.toString();
     }
 }