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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.
 *
 ******************************************************************************/

package org.pentaho.di.trans.steps.splitfieldtorows;

import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.pentaho.di.core.Const;
import org.pentaho.di.core.util.Utils;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.row.RowDataUtil;
import org.pentaho.di.core.row.RowMetaInterface;
import org.pentaho.di.i18n.BaseMessages;
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;

public class SplitFieldToRows extends BaseStep implements StepInterface {
  private static Class PKG = SplitFieldToRowsMeta.class; // for i18n purposes, needed by Translator2!!

  private SplitFieldToRowsMeta meta;
  private SplitFieldToRowsData data;

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

  private boolean splitField( RowMetaInterface rowMeta, Object[] rowData ) throws KettleException {
    if ( first ) {
      first = false;

      data.outputRowMeta = getInputRowMeta().clone();
      meta.getFields( data.outputRowMeta, getStepname(), null, null, this, repository, metaStore );

      String realSplitFieldName = environmentSubstitute( meta.getSplitField() );
      data.fieldnr = rowMeta.indexOfValue( realSplitFieldName );

      int numErrors = 0;
      if ( Utils.isEmpty( meta.getNewFieldname() ) ) {
        logError( BaseMessages.getString( PKG, "SplitFieldToRows.Log.NewFieldNameIsNull" ) );
        numErrors++;
      }

      if ( data.fieldnr < 0 ) {
        logError( BaseMessages
          .getString( PKG, "SplitFieldToRows.Log.CouldNotFindFieldToSplit", realSplitFieldName ) );
        numErrors++;
      }

      if ( !rowMeta.getValueMeta( data.fieldnr ).isString() ) {
        logError( BaseMessages.getString( PKG, "SplitFieldToRows.Log.SplitFieldNotValid", realSplitFieldName ) );
        numErrors++;
      }

      if ( meta.includeRowNumber() ) {
        String realRowNumberField = environmentSubstitute( meta.getRowNumberField() );
        if ( Utils.isEmpty( realRowNumberField ) ) {
          logError( BaseMessages.getString( PKG, "SplitFieldToRows.Exception.RownrFieldMissing" ) );
          numErrors++;
        }
      }

      if ( numErrors > 0 ) {
        setErrors( numErrors );
        stopAll();
        return false;
      }

      data.splitMeta = rowMeta.getValueMeta( data.fieldnr );
    }

    String originalString = data.splitMeta.getString( rowData[data.fieldnr] );
    if ( originalString == null ) {
      originalString = "";
    }

    if ( meta.includeRowNumber() && meta.resetRowNumber() ) {
      data.rownr = 1L;
    }
    // use -1 for include all strings. see http://jira.pentaho.com/browse/PDI-11477
    String[] splitStrings = data.delimiterPattern.split( originalString, -1 );
    for ( String string : splitStrings ) {
      Object[] outputRow = RowDataUtil.createResizedCopy( rowData, data.outputRowMeta.size() );
      outputRow[rowMeta.size()] = string;
      // Include row number in output?
      if ( meta.includeRowNumber() ) {
        outputRow[rowMeta.size() + 1] = data.rownr;
      }
      putRow( data.outputRowMeta, outputRow );
      data.rownr++;
    }

    return true;
  }

  public synchronized boolean processRow( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {
    meta = (SplitFieldToRowsMeta) smi;
    data = (SplitFieldToRowsData) sdi;

    Object[] r = getRow(); // get row from rowset, wait for our turn, indicate busy!
    if ( r == null ) { // no more input to be expected...

      setOutputDone();
      return false;
    }

    boolean ok = splitField( getInputRowMeta(), r );
    if ( !ok ) {
      setOutputDone();
      return false;
    }

    if ( checkFeedback( getLinesRead() ) ) {
      if ( log.isDetailed() ) {
        if ( log.isDetailed() ) {
          logBasic( BaseMessages.getString( PKG, "SplitFieldToRows.Log.LineNumber" ) + getLinesRead() );
        }
      }
    }

    return true;
  }

  public boolean init( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (SplitFieldToRowsMeta) smi;
    data = (SplitFieldToRowsData) sdi;

    if ( super.init( smi, sdi ) ) {
      data.rownr = 1L;

      try {
        String delimiter = Const.nullToEmpty( meta.getDelimiter() );
        if ( meta.isDelimiterRegex() ) {
          data.delimiterPattern = Pattern.compile( environmentSubstitute( delimiter ) );
        } else {
          data.delimiterPattern = Pattern.compile( Pattern.quote( environmentSubstitute( delimiter ) ) );
        }
      } catch ( PatternSyntaxException pse ) {
        log.logError( pse.getMessage() );
        throw pse;
      }

      return true;
    }
    return false;
  }
}