/*
 * Created on Sep 22, 2004 Copyright (C) 2001-4, Anthony Harrison anh23@pitt.edu
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version. This library is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details. You should have received a copy of
 * the GNU Lesser General Public License along with this library; if not, write
 * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 */
package org.jactr.core.production.condition;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jactr.core.chunk.IChunk;
import org.jactr.core.chunktype.IChunkType;
import org.jactr.core.model.IModel;
import org.jactr.core.production.request.ChunkTypeRequest;
import org.jactr.core.slot.ISlot;

/**
 * matches the contents of a buffer to a specific chunktype and slot values
 * 
 * @author harrison
 */
public class ChunkTypeCondition extends AbstractBufferCondition
{

  /**
   * Logger definition
   */
  static private final Log LOGGER = LogFactory.getLog(ChunkTypeCondition.class);

  private IChunkType _chunkType;
  
  
  public ChunkTypeCondition(String bufferName, IChunkType chunkType)
  {
    this(bufferName, chunkType, Collections.EMPTY_LIST);
  }

  public ChunkTypeCondition(String bufferName, IChunkType chunkType, Collection<? extends ISlot> slots)
  {
    super(bufferName);
    _chunkType = chunkType;
    setRequest(new ChunkTypeRequest(chunkType, slots));
  }
  
  public ChunkTypeCondition clone(IModel model, Map<String,Object> bindings) throws CannotMatchException
  {
    /*
     * check the provisional chunk binding
     */
    IChunk testChunk = (IChunk) bindings.get("="+getBufferName());
    
    if(testChunk==null)
      throw new CannotMatchException("No chunk to match in  "+getBufferName());
    
    return new ChunkTypeCondition(getBufferName(), getChunkType(), getRequest().getSlots());
  }

  public IChunkType getChunkType()
  {
    return _chunkType;
  }
  
  @Override
  public ChunkTypeRequest getRequest()
  {
    return (ChunkTypeRequest) super.getRequest();
  }

  @Override
  protected String createToString()
  {
    return String.format("ChunkTypeCondition(%s, %s, %s)", getBufferName(),
        getChunkType(), getSlots());
  }

//  /**
//   * bind and create a new ChunkCondition with the variables fully resolved
//   *
//   * @see org.jactr.core.production.condition.ICondition#bind(org.jactr.core.model.IModel,
//   *      Map)
//   */
//  public ICondition bind(IModel model, Map<String, Object> variableBindings)
//      throws CannotMatchException
//  {
//    IActivationBuffer buffer = getActivationBuffer(model);
//    // we create a chunkpattern
//    ChunkPattern pattern = new ChunkPattern(getChunkType(),
//        getConditionalSlots());
//    IChunk rtn = buffer.matches(pattern, variableBindings);
//
//    ChunkCondition cc = new ChunkCondition(getBufferName(), rtn);
//    cc.duplicateSlots(getSlots());
//    cc.checkAndBindSlots(rtn, variableBindings);
//    variableBindings.put("=" + getBufferName().toLowerCase(), rtn);
//    return cc;
//  }
  
  
  public int bind(IModel model, Map<String, Object> variableBindings, boolean isIterative) throws CannotMatchException
  {
    /*
     * check the provisional chunk binding
     */
    IChunk testChunk = (IChunk) variableBindings.get("="+getBufferName());
    
    if(testChunk==null)
      throw new CannotMatchException("No chunk to match in  "+getBufferName());
    
    return getRequest().bind(testChunk, model, variableBindings, isIterative);
  }
}