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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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 org.elasticsearch.search.aggregations.metrics.scripted;

import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.script.CompiledScript;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class InternalScriptedMetric extends InternalMetricsAggregation implements ScriptedMetric {
    private final Script reduceScript;
    private final Object aggregation;

    public InternalScriptedMetric(String name, Object aggregation, Script reduceScript, List pipelineAggregators,
            Map metaData) {
        super(name, pipelineAggregators, metaData);
        this.aggregation = aggregation;
        this.reduceScript = reduceScript;
    }

    /**
     * Read from a stream.
     */
    public InternalScriptedMetric(StreamInput in) throws IOException {
        super(in);
        reduceScript = in.readOptionalWriteable(Script::new);
        aggregation = in.readGenericValue();
    }

    @Override
    protected void doWriteTo(StreamOutput out) throws IOException {
        out.writeOptionalWriteable(reduceScript);
        out.writeGenericValue(aggregation);
    }

    @Override
    public String getWriteableName() {
        return ScriptedMetricAggregationBuilder.NAME;
    }

    @Override
    public Object aggregation() {
        return aggregation;
    }

    @Override
    public InternalAggregation doReduce(List aggregations, ReduceContext reduceContext) {
        List