/*
 * 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.
 */

import org.apache.drill.exec.expr.annotations.Workspace;

<@pp.dropOutputFile />



<#list decimalaggrtypes2.aggrtypes as aggrtype>
<@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gaggr/Decimal${aggrtype.className}Functions.java" />

<#include "/@includes/license.ftl" />

<#-- A utility class that is used to generate java code for aggr functions for decimal data type that maintain a single -->
<#-- running counter to hold the result.  This includes: MIN, MAX, COUNT. -->

/*
 * This class is automatically generated from AggrTypeFunctions1.tdd using FreeMarker.
 */

package org.apache.drill.exec.expr.fn.impl.gaggr;

<#include "/@includes/vv_imports.ftl" />

import org.apache.drill.exec.expr.DrillAggFunc;
import org.apache.drill.exec.expr.annotations.FunctionTemplate;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
import org.apache.drill.exec.expr.annotations.Output;
import org.apache.drill.exec.expr.annotations.Param;
import org.apache.drill.exec.expr.annotations.Workspace;
import org.apache.drill.exec.expr.holders.*;
import javax.inject.Inject;
import io.netty.buffer.DrillBuf;
import org.apache.drill.exec.record.RecordBatch;
import io.netty.buffer.ByteBuf;

/*
 * This class is generated using freemarker and the ${.template_name} template.
 */

@SuppressWarnings("unused")

public class Decimal${aggrtype.className}Functions {
<#list aggrtype.types as type>

@FunctionTemplate(name = "${aggrtype.funcName}",
    scope = FunctionTemplate.FunctionScope.POINT_AGGREGATE,
    returnType = FunctionTemplate.ReturnType.DECIMAL_SUM_AGGREGATE)
public static class ${type.inputType}${aggrtype.className} implements DrillAggFunc{

  @Param ${type.inputType}Holder in;
  @Inject DrillBuf buffer;
  @Workspace ObjectHolder value;
  @Workspace ${type.countRunningType}Holder count;
  @Workspace IntHolder outputScale;
  @Output ${type.outputType}Holder out;

  public void setup() {
    buffer.reallocIfNeeded(${type.outputType}Holder.WIDTH);
    value = new ObjectHolder();
    value.obj = java.math.BigDecimal.ZERO;
    count = new ${type.countRunningType}Holder();
    count.value = 0;
    outputScale = new IntHolder();
    outputScale.value = Integer.MIN_VALUE;
  }

  @Override
  public void add() {
	  <#if type.inputType?starts_with("Nullable")>
	    sout: {
	    if (in.isSet == 0) {
		    // processing nullable input and the value is null, so don't do anything...
		    break sout;
	    }
	  </#if>
    count.value++;
   <#if type.inputType.endsWith("Decimal9") || type.inputType.endsWith("Decimal18")>
    java.math.BigDecimal currentValue = org.apache.drill.exec.util.DecimalUtility.getBigDecimalFromPrimitiveTypes(in.value, in.scale, in.precision);
    <#else>
    java.math.BigDecimal currentValue = org.apache.drill.exec.util.DecimalUtility.getBigDecimalFromSparse(in.buffer, in.start, in.nDecimalDigits, in.scale);
    </#if>
    value.obj = ((java.math.BigDecimal)(value.obj)).add(currentValue);
    if (outputScale.value == Integer.MIN_VALUE) {
      outputScale.value = in.scale;
    }
	<#if type.inputType?starts_with("Nullable")>
    } // end of sout block
	</#if>
  }

  @Override
  public void output() {
    out.buffer = buffer;
    out.start  = 0;
    out.scale = outputScale.value;
    out.precision = 38;
    java.math.BigDecimal average = ((java.math.BigDecimal)(value.obj)).divide(java.math.BigDecimal.valueOf(count.value, 0), out.scale, java.math.BigDecimal.ROUND_HALF_UP);
    org.apache.drill.exec.util.DecimalUtility.getSparseFromBigDecimal(average, out.buffer, out.start, out.scale, out.precision, out.nDecimalDigits);
  }

  @Override
  public void reset() {
    value = new ObjectHolder();
    value.obj = java.math.BigDecimal.ZERO;
    count = new ${type.countRunningType}Holder();
    count.value = 0;
    outputScale = new IntHolder();
    outputScale.value = Integer.MIN_VALUE;
  }
}


</#list>
}
</#list>