/*******************************************************************************
    * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
    *
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Eclipse Public License v1.0
    * which accompanies this distribution, and is available at
    *  http://www.eclipse.org/legal/epl-v10.html
    *
    * Alternatively, the contents of this file may be used under the terms of
   * either the GNU Lesser General Public License Version 2.1 or later (the
   * "LGPL"), in which case the provisions of the LGPL are applicable instead
   * of those above. If you wish to allow use of your version of this file only
   * under the terms of the LGPL, and not to allow others to use your version of
   * this file under the terms of the EPL, indicate your decision by deleting
   * the provisions above and replace them with the notice and other provisions
   * required by the LGPL. If you do not delete the provisions above, a recipient
   * may use your version of this file under the terms of the EPL or the LGPL.
   *
   * Based on the original MiniSat specification from:
   *
   * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
   * Sixth International Conference on Theory and Applications of Satisfiability
   * Testing, LNCS 2919, pp 502-518, 2003.
   *
   * See www.minisat.se for the original solver in C++.
   *
   * Contributors:
   *   CRIL - initial API and implementation
   *******************************************************************************/
  package org.sat4j.tools;
  
  import org.sat4j.specs.ISolverService;
  import org.sat4j.specs.Lbool;
  
  /**
   * @since 2.2
   */
  public class DecisionTracing extends SearchListenerAdapter<ISolverService> {
  
      /**
  	 * 
  	 */
      private static final long serialVersionUID = 1L;
  
      private int counter;
  
      private final IVisualizationTool positiveVisu;
      private final IVisualizationTool negativeVisu;
      private final IVisualizationTool restartVisu;
      private final IVisualizationTool cleanVisu;
  
      private int nVar;
  
      public DecisionTracing(IVisualizationTool positiveVisu,
              IVisualizationTool negativeVisu, IVisualizationTool restartVisu,
              IVisualizationTool cleanVisu) {
          this.positiveVisu = positiveVisu;
          this.negativeVisu = negativeVisu;
          this.restartVisu = restartVisu;
          this.cleanVisu = cleanVisu;
  
          this.counter = 1;
      }
  
      @Override
      public void assuming(int p) {
          if (p > 0) {
              this.positiveVisu.addPoint(this.counter, p);
              this.negativeVisu.addInvisiblePoint(this.counter, 0);
          } else {
              this.negativeVisu.addPoint(this.counter, -p);
              this.positiveVisu.addInvisiblePoint(this.counter, 0);
          }
          this.restartVisu.addInvisiblePoint(this.counter, 0);
          this.cleanVisu.addInvisiblePoint(this.counter, 0);
          this.counter++;
      }
  
      @Override
      public void restarting() {
          this.restartVisu.addPoint(this.counter, this.nVar);
          this.cleanVisu.addPoint(this.counter, 0);
          this.positiveVisu.addInvisiblePoint(this.counter, 0);
          this.negativeVisu.addInvisiblePoint(this.counter, 0);
      }
  
      @Override
      public void end(Lbool result) {
          this.positiveVisu.end();
          this.negativeVisu.end();
          this.restartVisu.end();
          this.cleanVisu.end();
      }
  
      @Override
      public void start() {
          this.counter = 1;
      }
  
     @Override
     public void init(ISolverService solverService) {
         this.nVar = solverService.nVars();
         this.positiveVisu.init();
         this.negativeVisu.init();
         this.restartVisu.init();
         this.cleanVisu.init();
     }
 
     @Override
     public void cleaning() {
         this.restartVisu.addPoint(this.counter, 0);
         this.cleanVisu.addPoint(this.counter, this.nVar);
         this.positiveVisu.addInvisiblePoint(this.counter, 0);
         this.negativeVisu.addInvisiblePoint(this.counter, 0);
     }
 
 }