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 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2017 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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.
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package org.pentaho.di.trans.steps.rules;

import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleStepException;
import org.pentaho.di.trans.Trans;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.BaseStep;
import org.pentaho.di.trans.step.StepDataInterface;
import org.pentaho.di.trans.step.StepInterface;
import org.pentaho.di.trans.step.StepMeta;
import org.pentaho.di.trans.step.StepMetaInterface;
import org.pentaho.di.trans.steps.rules.Rules.Row;

public class RulesAccumulator extends BaseStep implements StepInterface {
  // private static Class<?> PKG = Rules.class; // for i18n purposes

  private RulesAccumulatorMeta meta;

  private RulesAccumulatorData data;

  public RulesAccumulator( StepMeta stepMeta, StepDataInterface stepDataInterface, int copyNr,
    TransMeta transMeta, Trans trans ) {
    super( stepMeta, stepDataInterface, copyNr, transMeta, trans );
  }

  public boolean init( StepMetaInterface smi, StepDataInterface sdi ) {

    meta = (RulesAccumulatorMeta) smi;
    data = (RulesAccumulatorData) sdi;

    if ( super.init( smi, sdi ) ) {
      return true;
    }
    return false;
  }

  public boolean runtimeInit() throws KettleStepException {
    try {
      data.setOutputRowMeta( getInputRowMeta().clone() );
      meta.setKeepInputFields( false );
      meta.getFields( data.getOutputRowMeta(), getStepname(), null, null, this, repository, metaStore );

      data.setRuleFilePath( meta.getRuleFile() );
      data.setRuleString( meta.getRuleDefinition() );

      data.initializeRules();
      data.initializeInput( getInputRowMeta() );

      return true;
    } catch ( Exception e ) {
      throw new KettleStepException( e );
    }
  }

  public void dispose( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (RulesAccumulatorMeta) smi;
    data = (RulesAccumulatorData) sdi;

    super.dispose( smi, sdi );
  }

  public boolean processRow( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {
    try {
      meta = (RulesAccumulatorMeta) smi;
      data = (RulesAccumulatorData) sdi;

      Object[] r = getRow(); // get row, set busy!

      if ( r == null ) { // no more input to be expected...

        data.execute();

        Object[] outputRow;

        String[] expectedResults = meta.getExpectedResultList();

        for ( Row resultRow : data.getResultRows() ) {
          outputRow = new Object[expectedResults.length];
          for ( String columnName : expectedResults ) {
            outputRow[data.getOutputRowMeta().indexOfValue( columnName )] = resultRow.getColumn().get( columnName );
          }
          putRow( data.getOutputRowMeta(), outputRow );
        }

        data.shutdown();
        setOutputDone();
        return false;
      }

      if ( first ) {
        if ( !runtimeInit() ) {
          return false;
        }

        first = false;
      }

      // Store the row for processing
      data.loadRow( r );

      return true;
    } catch ( Exception e ) {
      throw new KettleException( e );
    }
  }
}
