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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2019 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.databasejoin;

import java.sql.ResultSet;

import org.pentaho.di.core.database.Database;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleStepException;
import org.pentaho.di.core.row.RowDataUtil;
import org.pentaho.di.core.row.RowMeta;
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;

/**
 * Use values from input streams to joins with values in a database. Freehand SQL can be used to do this.
 *
 * @author Matt
 * @since 26-apr-2003
 */
public class DatabaseJoin extends BaseStep implements StepInterface {
  private static Class PKG = DatabaseJoinMeta.class; // for i18n purposes, needed by Translator2!!

  private DatabaseJoinMeta meta;
  private DatabaseJoinData data;

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

  private synchronized void lookupValues( RowMetaInterface rowMeta, Object[] rowData ) throws KettleException {
    if ( first ) {
      first = false;

      data.outputRowMeta = rowMeta.clone();
      meta.getFields(
        data.outputRowMeta, getStepname(), new RowMetaInterface[] { meta.getTableFields(), }, null, this,
        repository, metaStore );

      data.lookupRowMeta = new RowMeta();

      if ( log.isDetailed() ) {
        logDetailed( BaseMessages.getString( PKG, "DatabaseJoin.Log.CheckingRow" ) + rowMeta.getString( rowData ) );
      }

      data.keynrs = new int[meta.getParameterField().length];

      for ( int i = 0; i < meta.getParameterField().length; i++ ) {
        data.keynrs[i] = rowMeta.indexOfValue( meta.getParameterField()[i] );
        if ( data.keynrs[i] < 0 ) {
          throw new KettleStepException( BaseMessages.getString( PKG, "DatabaseJoin.Exception.FieldNotFound", meta
            .getParameterField()[i] ) );
        }

        data.lookupRowMeta.addValueMeta( rowMeta.getValueMeta( data.keynrs[i] ).clone() );
      }
    }

    // Construct the parameters row...
    Object[] lookupRowData = new Object[data.lookupRowMeta.size()];
    for ( int i = 0; i < data.keynrs.length; i++ ) {
      lookupRowData[i] = rowData[data.keynrs[i]];
    }

    // Set the values on the prepared statement (for faster exec.)
    ResultSet rs = data.db.openQuery( data.pstmt, data.lookupRowMeta, lookupRowData );

    // Get a row from the database...
    //
    Object[] add = data.db.getRow( rs );
    RowMetaInterface addMeta = data.db.getReturnRowMeta();

    incrementLinesInput();

    int counter = 0;
    while ( add != null && ( meta.getRowLimit() == 0 || counter < meta.getRowLimit() ) ) {
      counter++;

      Object[] newRow = RowDataUtil.resizeArray( rowData, data.outputRowMeta.size() );
      int newIndex = rowMeta.size();
      for ( int i = 0; i < addMeta.size(); i++ ) {
        newRow[newIndex++] = add[i];
      }
      // we have to clone, otherwise we only get the last new value
      putRow( data.outputRowMeta, data.outputRowMeta.cloneRow( newRow ) );

      if ( log.isRowLevel() ) {
        logRowlevel( BaseMessages.getString( PKG, "DatabaseJoin.Log.PutoutRow" )
          + data.outputRowMeta.getString( newRow ) );
      }

      // Get a new row
      if ( meta.getRowLimit() == 0 || counter < meta.getRowLimit() ) {
        add = data.db.getRow( rs );
        incrementLinesInput();
      }
    }

    // Nothing found? Perhaps we have to put something out after all?
    if ( counter == 0 && meta.isOuterJoin() ) {
      if ( data.notfound == null ) {
        // Just return null values for all values...
        //
        data.notfound = new Object[data.db.getReturnRowMeta().size()];
      }
      Object[] newRow = RowDataUtil.resizeArray( rowData, data.outputRowMeta.size() );
      int newIndex = rowMeta.size();
      for ( int i = 0; i < data.notfound.length; i++ ) {
        newRow[newIndex++] = data.notfound[i];
      }
      putRow( data.outputRowMeta, newRow );
    }

    data.db.closeQuery( rs );
  }

  public boolean processRow( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {
    meta = (DatabaseJoinMeta) smi;
    data = (DatabaseJoinData) sdi;

    boolean sendToErrorRow = false;
    String errorMessage = null;

    Object[] r = getRow(); // Get row from input rowset & set row busy!
    if ( r == null ) { // no more input to be expected...
      setOutputDone();
      return false;
    }

    try {
      lookupValues( getInputRowMeta(), r ); // add new values to the row in rowset[0].

      if ( checkFeedback( getLinesRead() ) ) {
        if ( log.isBasic() ) {
          logBasic( BaseMessages.getString( PKG, "DatabaseJoin.Log.LineNumber" ) + getLinesRead() );
        }
      }
    } catch ( KettleException e ) {

      if ( getStepMeta().isDoingErrorHandling() ) {
        sendToErrorRow = true;
        errorMessage = e.toString();
      } else {

        logError( BaseMessages.getString( PKG, "DatabaseJoin.Log.ErrorInStepRunning" ) + e.getMessage(), e );
        setErrors( 1 );
        stopAll();
        setOutputDone(); // signal end to receiver(s)
        return false;
      }
      if ( sendToErrorRow ) {
        // Simply add this row to the error row
        putError( getInputRowMeta(), r, 1, errorMessage, null, "DBJOIN001" );
      }
    }

    return true;
  }

  /**
   * Stop the running query
   * [PDI-17820] - In the Database Join step data.isCancelled is checked before synchronization and set after synchronization is completed.
   *
   * To cancel a prepared statement we need a valid database connection which we do not have if disposed has already been called
   *
   *
   * */
  public synchronized void stopRunning( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {
    if ( this.isStopped() || sdi.isDisposed() ) {
      return;
    }
    meta = (DatabaseJoinMeta) smi;
    data = (DatabaseJoinData) sdi;

    if ( data.db != null && data.db.getConnection() != null && !data.isCanceled ) {
      data.db.cancelStatement( data.pstmt );
      setStopped( true );
      data.isCanceled = true;
    }
  }

  public boolean init( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (DatabaseJoinMeta) smi;
    data = (DatabaseJoinData) sdi;

    if ( super.init( smi, sdi ) ) {
      if ( meta.getDatabaseMeta() == null ) {
        logError( BaseMessages.getString( PKG, "DatabaseJoin.Init.ConnectionMissing", getStepname() ) );
        return false;
      }
      data.db = new Database( this, meta.getDatabaseMeta() );
      data.db.shareVariablesWith( this );

      try {
        if ( getTransMeta().isUsingUniqueConnections() ) {
          synchronized ( getTrans() ) {
            data.db.connect( getTrans().getTransactionId(), getPartitionID() );
          }
        } else {
          data.db.connect( getPartitionID() );
        }

        if ( log.isDetailed() ) {
          logDetailed( BaseMessages.getString( PKG, "DatabaseJoin.Log.ConnectedToDB" ) );
        }

        String sql = meta.getSql();
        if ( meta.isVariableReplace() ) {
          sql = environmentSubstitute( sql );
        }
        // Prepare the SQL statement
        data.pstmt = data.db.prepareSQL( sql );
        if ( log.isDebug() ) {
          logDebug( BaseMessages.getString( PKG, "DatabaseJoin.Log.SQLStatement", sql ) );
        }
        data.db.setQueryLimit( meta.getRowLimit() );

        return true;
      } catch ( KettleException e ) {
        logError( BaseMessages.getString( PKG, "DatabaseJoin.Log.DatabaseError" ) + e.getMessage(), e );
        if ( data.db != null ) {
          data.db.disconnect();
        }
      }
    }

    return false;
  }

  public void dispose( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (DatabaseJoinMeta) smi;
    data = (DatabaseJoinData) sdi;

    if ( data.db != null ) {
      data.db.disconnect();
    }

    super.dispose( smi, sdi );
  }
}