/*
 * 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.
 */
<@pp.dropOutputFile />



<#list aggrtypes1.aggrtypes as aggrtype>
<@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gaggr/${aggrtype.className}Functions.java" />

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

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

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

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

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.*;

@SuppressWarnings("unused")

public class ${aggrtype.className}Functions {
	static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(${aggrtype.className}Functions.class);

<#list aggrtype.types as type>
<#if type.major == "Numeric">

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

  @Param ${type.inputType}Holder in;
  @Workspace ${type.runningType}Holder value;
  @Workspace BigIntHolder nonNullCount;
  @Output ${type.outputType}Holder out;

  public void setup() {
	  value = new ${type.runningType}Holder();
	  nonNullCount = new BigIntHolder();
	  nonNullCount.value = 0;
	<#if aggrtype.funcName == "sum" || aggrtype.funcName == "any_value">
	  value.value = 0;
	<#elseif aggrtype.funcName == "min">
    <#if type.runningType?starts_with("Bit")>
      value.value = 1;
	  <#elseif type.runningType?starts_with("Int")>
	    value.value = Integer.MAX_VALUE;
	  <#elseif type.runningType?starts_with("BigInt")>
	    value.value = Long.MAX_VALUE;
	  <#elseif type.runningType?starts_with("Float4")>
		value.value = Float.NaN;
	  <#elseif type.runningType?starts_with("Float8")>
		value.value = Double.NaN;
	  </#if>
	<#elseif aggrtype.funcName == "max">
    <#if type.runningType?starts_with("Bit")>
      value.value = 0;
	  <#elseif type.runningType?starts_with("Int")>
	    value.value = Integer.MIN_VALUE;
	  <#elseif type.runningType?starts_with("BigInt")>
	    value.value = Long.MIN_VALUE;
	  <#elseif type.runningType?starts_with("Float4")>
		value.value = -Float.MAX_VALUE;
	  <#elseif type.runningType?starts_with("Float8")>
		value.value = -Double.MAX_VALUE;
	  </#if>
	</#if>
	  
  }
  
  @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>
    nonNullCount.value = 1;
	// For min/max functions: NaN is the biggest value,
    // Infinity is the second biggest value
    // -Infinity is the smallest  value
	  <#if aggrtype.funcName == "min">
	    <#if type.inputType?contains("Float4")>
		if(!Float.isNaN(in.value)) {
		  value.value = Float.isNaN(value.value) ? in.value : Math.min(value.value, in.value);
		}
	    <#elseif type.inputType?contains("Float8")>
	  if(!Double.isNaN(in.value)) {
	    value.value = Double.isNaN(value.value) ? in.value : Math.min(value.value, in.value);
	  }
      <#else>
		value.value = Math.min(value.value, in.value);
		  </#if>
	  <#elseif aggrtype.funcName == "max">
	    value.value = Math.max(value.value,  in.value);
	  <#elseif aggrtype.funcName == "sum">
	    value.value += in.value;
	  <#elseif aggrtype.funcName == "count">
	    value.value++;
    <#elseif aggrtype.funcName == "any_value">
		  value.value = in.value;
    <#else>
	  // TODO: throw an error ? 
	  </#if>
	<#if type.inputType?starts_with("Nullable")>
    } // end of sout block
	</#if>
  }

  @Override
  public void output() {   
    if (nonNullCount.value > 0) {
      out.value = value.value;
      out.isSet = 1;
    } else {
      out.isSet = 0;
    }
  }

  @Override
  public void reset() {
    nonNullCount.value = 0;
	<#if aggrtype.funcName == "sum" || aggrtype.funcName == "count" || aggrtype.funcName == "any_value">
	  value.value = 0;
	<#elseif aggrtype.funcName == "min">
	  <#if type.runningType?starts_with("Int")>
	    value.value = Integer.MAX_VALUE;
	  <#elseif type.runningType?starts_with("BigInt")>
	    value.value = Long.MAX_VALUE;
	  <#elseif type.runningType?starts_with("Float4")>
		value.value = Float.NaN;
	  <#elseif type.runningType?starts_with("Float8")>
		value.value = Double.NaN;
	  </#if>
	<#elseif aggrtype.funcName == "max">
	  <#if type.runningType?starts_with("Int")>
	    value.value = Integer.MIN_VALUE;
	  <#elseif type.runningType?starts_with("BigInt")>
	    value.value = Long.MIN_VALUE;
	  <#elseif type.runningType?starts_with("Float4")>
		value.value = -Float.MAX_VALUE;
	  <#elseif type.runningType?starts_with("Float8")>
		value.value = -Double.MAX_VALUE;
	  </#if>
	</#if>
	  
  }
 
 }

</#if>
</#list>
}
</#list>

