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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.imp;

import java.util.ArrayList;
import java.util.List;

import org.pentaho.di.core.Const;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.plugins.ImportRulePluginType;
import org.pentaho.di.core.plugins.PluginInterface;
import org.pentaho.di.core.plugins.PluginRegistry;
import org.pentaho.di.core.xml.XMLHandler;
import org.pentaho.di.imp.rule.ImportRuleInterface;
import org.pentaho.di.imp.rule.ImportValidationFeedback;
import org.pentaho.di.imp.rules.BaseImportRule;
import org.w3c.dom.Node;

public class ImportRules implements Cloneable {

  public static final String XML_TAG = "rules";

  protected List rules;

  public ImportRules() {
    rules = new ArrayList();
  }

  /**
   * Perform a deep clone
   *
   * @return a deep copy of the all the import rules.
   */
  @Override
  public ImportRules clone() {

    ImportRules importRules = new ImportRules();

    for ( ImportRuleInterface rule : rules ) {
      importRules.getRules().add( rule.clone() );
    }

    return importRules;
  }

  public List verifyRules( Object subject ) {
    List feedback = new ArrayList();

    for ( ImportRuleInterface rule : rules ) {
      feedback.addAll( rule.verifyRule( subject ) );
    }

    return feedback;

  }

  public void loadXML( Node rulesNode ) throws KettleException {
    List ruleNodes = XMLHandler.getNodes( rulesNode, BaseImportRule.XML_TAG );
    for ( Node ruleNode : ruleNodes ) {
      String id = XMLHandler.getTagValue( ruleNode, "id" );

      PluginRegistry registry = PluginRegistry.getInstance();

      PluginInterface plugin = registry.findPluginWithId( ImportRulePluginType.class, id );
      if ( plugin == null ) {
        throw new KettleException( "The import rule of type '"
          + id + "' could not be found in the plugin registry." );
      }
      ImportRuleInterface rule = (ImportRuleInterface) registry.loadClass( plugin );

      rule.loadXML( ruleNode );

      getRules().add( rule );
    }
  }

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

    xml.append( XMLHandler.openTag( XML_TAG ) ).append( Const.CR ).append( Const.CR );

    for ( ImportRuleInterface rule : getRules() ) {

      PluginInterface plugin = PluginRegistry.getInstance().getPlugin( ImportRulePluginType.class, rule.getId() );
      xml.append( "" ).append( Const.CR );

      xml.append( rule.getXML() );
      xml.append( Const.CR ).append( Const.CR );
    }

    xml.append( XMLHandler.closeTag( XML_TAG ) );

    return xml.toString();
  }

  public List getRules() {
    return rules;
  }

  public void setRules( List rules ) {
    this.rules = rules;
  }

}