/*
 * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.execution.engine.aggregation.impl;

import com.google.common.collect.ImmutableList;
import io.crate.breaker.RamAccounting;
import io.crate.breaker.SizeEstimator;
import io.crate.breaker.SizeEstimatorFactory;
import io.crate.data.Input;
import io.crate.memory.MemoryManager;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionInfo;
import io.crate.execution.engine.aggregation.AggregationFunction;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import org.elasticsearch.Version;

import javax.annotation.Nullable;

public class ArbitraryAggregation extends AggregationFunction<Object, Object> {

    public static final String NAME = "arbitrary";

    private final FunctionInfo info;
    private final SizeEstimator<Object> partialEstimator;

    public static void register(AggregationImplModule mod) {
        for (final DataType t : DataTypes.PRIMITIVE_TYPES) {
            mod.register(new ArbitraryAggregation(
                new FunctionInfo(new FunctionIdent(NAME, ImmutableList.of(t)), t,
                    FunctionInfo.Type.AGGREGATE)));
        }
    }

    ArbitraryAggregation(FunctionInfo info) {
        this.info = info;
        partialEstimator = SizeEstimatorFactory.create(partialType());
    }

    @Override
    public FunctionInfo info() {
        return info;
    }

    @Override
    public DataType partialType() {
        return info.returnType();
    }

    @Nullable
    @Override
    public Object newState(RamAccounting ramAccounting,
                           Version indexVersionCreated,
                           Version minNodeInCluster,
                           MemoryManager memoryManager) {
        return null;
    }

    @Override
    public Object iterate(RamAccounting ramAccounting,
                          MemoryManager memoryManager,
                          Object state,
                          Input... args) {
        return reduce(ramAccounting, state, args[0].value());
    }

    @Override
    public Object reduce(RamAccounting ramAccounting, Object state1, Object state2) {
        if (state1 == null) {
            if (state2 != null) {
                // this case happens only once per aggregation so ram usage is only estimated once
                ramAccounting.addBytes(partialEstimator.estimateSize(state2));
            }
            return state2;
        }
        return state1;
    }

    @Override
    public Object terminatePartial(RamAccounting ramAccounting, Object state) {
        return state;
    }
}

@@ -1071,56 +1071,8 @@
 l;%0A%0A
-import com.google.common.collect.ImmutableList;%0A
 impo
@@ -1106,16 +1106,16 @@
 unting;%0A
+
 import i
@@ -1402,16 +1402,62 @@
 nction;%0A
+import io.crate.metadata.functions.Signature;%0A
 import i
@@ -1890,25 +1890,26 @@
 or (
-final Data
+var supported
 Type 
-t 
 : Da
@@ -1960,16 +1960,213 @@
 egister(
+%0A                Signature.aggregate(%0A                    NAME,%0A                    supportedType.getTypeSignature(),%0A                    supportedType.getTypeSignature()),%0A                args -%3E 
 new Arbi
@@ -2199,16 +2199,20 @@
         
+  
+  
 new Func
@@ -2224,57 +2224,105 @@
 nfo(
-new FunctionIdent(NAME, ImmutableList.of(t)), t,%0A
+%0A                        new FunctionIdent(NAME, args),%0A                        args.get(0),%0A    
     
@@ -2366,16 +2366,29 @@
 REGATE))
+%0A            
 );%0A     
@@ -2630,32 +2630,32 @@
 %0A%0A    @Override%0A
-
     public DataT
@@ -2657,16 +2657,19 @@
 DataType
+%3C?%3E
  partial

Refactor arbitraty agg function to use new function registry.