/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.adobe.ac.pmd.rules.parsley;

import java.util.List;

import com.adobe.ac.pmd.nodes.IFunction;
import com.adobe.ac.pmd.nodes.IIdentifierNode;
import com.adobe.ac.pmd.nodes.IMetaData;
import com.adobe.ac.pmd.nodes.IParameter;
import com.adobe.ac.pmd.rules.core.AbstractFlexMetaDataRule;
import com.adobe.ac.pmd.rules.core.ViolationPriority;
import com.adobe.ac.pmd.rules.parsley.utils.ParsleyMetaData;

public final class RedundantMessageHandlerTypeAttributeRule extends AbstractFlexMetaDataRule
{
   /*
    * (non-Javadoc)
    * @seecom.adobe.ac.pmd.rules.core.AbstractFlexMetaDataRule#
    * findViolationsFromFunctionMetaData(com.adobe.ac.pmd.nodes.IFunction)
    */
   @Override
   protected void findViolationsFromFunctionMetaData( final IFunction function )
   {
      final List< IParameter > params = function.getParameters();

      if ( params.size() == 1 )
      {
         final IIdentifierNode parameterType = params.get( 0 ).getType();
         findMessageHandlersContainingType( function,
                                            parameterType );
      }
   }

   /*
    * (non-Javadoc)
    * @see com.adobe.ac.pmd.rules.core.AbstractFlexRule#getDefaultPriority()
    */
   @Override
   protected ViolationPriority getDefaultPriority()
   {
      return ViolationPriority.NORMAL;
   }

   private void findMessageHandlersContainingType( final IFunction function,
                                                   final IIdentifierNode type )
   {
      final List< IMetaData > handlers = ParsleyMetaData.MESSAGE_HANDLER.getMetaDataList( function );

      for ( final IMetaData handler : handlers )
      {
         final String parameterType = type.toString();
         final String metaDataType = getMessageHandlerType( handler );

         if ( metaDataType != null
               && metaDataType.equals( parameterType ) )
         {
            addViolation( handler );
         }
      }
   }

   private String getMessageHandlerType( final IMetaData handler )
   {
      final String[] types = handler.getProperty( "type" );
      String type = "";

      if ( types.length > 0
            && types[ 0 ].contains( "." ) )
      {
         type = types[ 0 ];
         final int index = type.lastIndexOf( '.' ) + 1;

         if ( index < type.length() )
         {
            type = type.substring( index );
         }
      }

      return type;
   }
}