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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2018 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.setvaluefield;

import java.util.List;

import org.pentaho.di.core.CheckResult;
import org.pentaho.di.core.CheckResultInterface;
import org.pentaho.di.core.Const;
import org.pentaho.di.core.injection.Injection;
import org.pentaho.di.core.injection.InjectionSupported;
import org.pentaho.di.core.util.Utils;
import org.pentaho.di.core.database.DatabaseMeta;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleXMLException;
import org.pentaho.di.core.row.RowMetaInterface;
import org.pentaho.di.core.variables.VariableSpace;
import org.pentaho.di.core.xml.XMLHandler;
import org.pentaho.di.i18n.BaseMessages;
import org.pentaho.di.repository.ObjectId;
import org.pentaho.di.repository.Repository;
import org.pentaho.di.shared.SharedObjectInterface;
import org.pentaho.di.trans.Trans;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.BaseStepMeta;
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.metastore.api.IMetaStore;
import org.w3c.dom.Node;

@InjectionSupported( localizationPrefix = "SetValueField.Injection.", groups = { "FIELDS" } )
public class SetValueFieldMeta extends BaseStepMeta implements StepMetaInterface {
  private static Class PKG = SetValueFieldMeta.class; // for i18n purposes, needed by Translator2!!

  @Injection( name = "FIELD_NAME", group = "FIELDS" )
  private String[] fieldName;

  @Injection( name = "REPLACE_BY_FIELD_VALUE", group = "FIELDS" )
  private String[] replaceByFieldValue;

  public SetValueFieldMeta() {
    super(); // allocate BaseStepMeta
  }

  /**
   * @return Returns the fieldName.
   */
  public String[] getFieldName() {
    return fieldName;
  }

  /**
   * @param fieldName
   *          The fieldName to set.
   */
  public void setFieldName( String[] fieldName ) {
    this.fieldName = fieldName;
  }

  /**
   * @return Returns the replaceByFieldValue.
   */
  public String[] getReplaceByFieldValue() {
    return replaceByFieldValue;
  }

  /**
   * @param replaceByFieldValue
   *          The replaceByFieldValue to set.
   */
  public void setReplaceByFieldValue( String[] replaceByFieldValue ) {
    this.replaceByFieldValue = replaceByFieldValue;
  }

  public void loadXML( Node stepnode, List databases, IMetaStore metaStore ) throws KettleXMLException {
    readData( stepnode, databases );
  }

  public void allocate( int count ) {
    fieldName = new String[count];
    replaceByFieldValue = new String[count];
  }

  public Object clone() {
    SetValueFieldMeta retval = (SetValueFieldMeta) super.clone();

    int count = fieldName.length;

    retval.allocate( count );
    System.arraycopy( fieldName, 0, retval.fieldName, 0, count );
    System.arraycopy( replaceByFieldValue, 0, retval.replaceByFieldValue, 0, count );

    return retval;
  }

  private void readData( Node stepnode, List databases ) throws KettleXMLException {
    try {
      Node fields = XMLHandler.getSubNode( stepnode, "fields" );
      int count = XMLHandler.countNodes( fields, "field" );

      allocate( count );

      for ( int i = 0; i < count; i++ ) {
        Node fnode = XMLHandler.getSubNodeByNr( fields, "field", i );

        fieldName[i] = XMLHandler.getTagValue( fnode, "name" );
        replaceByFieldValue[i] = XMLHandler.getTagValue( fnode, "replaceby" );
      }
    } catch ( Exception e ) {
      throw new KettleXMLException( BaseMessages.getString(
        PKG, "SetValueFieldMeta.Exception.UnableToReadStepInfoFromXML" ), e );
    }
  }

  public void setDefault() {
    int count = 0;

    allocate( count );

    for ( int i = 0; i < count; i++ ) {
      fieldName[i] = "field" + i;
      replaceByFieldValue[i] = "";
    }
  }

  public String getXML() {
    StringBuilder retval = new StringBuilder();

    retval.append( "    " + Const.CR );

    for ( int i = 0; i < fieldName.length; i++ ) {
      retval.append( "      " + Const.CR );
      retval.append( "        " + XMLHandler.addTagValue( "name", fieldName[i] ) );
      retval.append( "        " + XMLHandler.addTagValue( "replaceby", replaceByFieldValue[i] ) );
      retval.append( "        " + Const.CR );
    }
    retval.append( "      " + Const.CR );

    return retval.toString();
  }

  public void readRep( Repository rep, IMetaStore metaStore, ObjectId id_step, List databases ) throws KettleException {
    try {
      int nrfields = rep.countNrStepAttributes( id_step, "field_name" );

      allocate( nrfields );

      for ( int i = 0; i < nrfields; i++ ) {
        fieldName[i] = rep.getStepAttributeString( id_step, i, "field_name" );
        replaceByFieldValue[i] = rep.getStepAttributeString( id_step, i, "replace_by" );
      }
    } catch ( Exception e ) {
      throw new KettleException( BaseMessages.getString(
        PKG, "SetValueFieldMeta.Exception.UnexpectedErrorReadingStepInfoFromRepository" ), e );
    }
  }

  public void saveRep( Repository rep, IMetaStore metaStore, ObjectId id_transformation, ObjectId id_step ) throws KettleException {
    try {
      for ( int i = 0; i < fieldName.length; i++ ) {
        rep.saveStepAttribute( id_transformation, id_step, i, "field_name", fieldName[i] );
        rep.saveStepAttribute( id_transformation, id_step, i, "replace_by", replaceByFieldValue[i] );
      }
    } catch ( Exception e ) {
      throw new KettleException( BaseMessages.getString(
        PKG, "SetValueFieldMeta.Exception.UnableToSaveStepInfoToRepository" )
        + id_step, e );
    }

  }

  public void check( List remarks, TransMeta transMeta, StepMeta stepMeta,
    RowMetaInterface prev, String[] input, String[] output, RowMetaInterface info, VariableSpace space,
    Repository repository, IMetaStore metaStore ) {
    CheckResult cr;
    if ( prev == null || prev.size() == 0 ) {
      cr =
        new CheckResult( CheckResult.TYPE_RESULT_WARNING, BaseMessages.getString(
          PKG, "SetValueFieldMeta.CheckResult.NoReceivingFieldsError" ), stepMeta );
    } else {
      cr =
        new CheckResult( CheckResult.TYPE_RESULT_OK, BaseMessages.getString(
          PKG, "SetValueFieldMeta.CheckResult.StepReceivingFieldsOK", prev.size() + "" ), stepMeta );
    }
    remarks.add( cr );

    // See if we have input streams leading to this step!
    if ( input.length > 0 ) {
      cr =
        new CheckResult( CheckResult.TYPE_RESULT_OK, BaseMessages.getString(
          PKG, "SetValueFieldMeta.CheckResult.StepRecevingInfoFromOtherSteps" ), stepMeta );
    } else {
      cr =
        new CheckResult( CheckResult.TYPE_RESULT_ERROR, BaseMessages.getString(
          PKG, "SetValueFieldMeta.CheckResult.NoInputReceivedError" ), stepMeta );
    }
    remarks.add( cr );

    if ( fieldName == null && fieldName.length == 0 ) {
      cr =
        new CheckResult( CheckResult.TYPE_RESULT_ERROR, BaseMessages.getString(
          PKG, "SetValueFieldMeta.CheckResult.FieldsSelectionEmpty" ), stepMeta );
      remarks.add( cr );
    } else {
      for ( int i = 0; i < fieldName.length; i++ ) {
        if ( Utils.isEmpty( replaceByFieldValue[i] ) ) {
          cr =
            new CheckResult( CheckResult.TYPE_RESULT_ERROR, BaseMessages.getString(
              PKG, "SetValueFieldMeta.CheckResult.ReplaceByValueMissing", fieldName[i], "" + i ), stepMeta );
          remarks.add( cr );
        }
      }
    }
  }

  public StepInterface getStep( StepMeta stepMeta, StepDataInterface stepDataInterface, int cnr,
    TransMeta transMeta, Trans trans ) {
    return new SetValueField( stepMeta, stepDataInterface, cnr, transMeta, trans );
  }

  public StepDataInterface getStepData() {
    return new SetValueFieldData();
  }

  public boolean supportsErrorHandling() {
    return true;
  }
}