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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.facet.filter;

import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.bytes.HashedBytesArray;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentBuilderString;
import org.elasticsearch.search.facet.Facet;
import org.elasticsearch.search.facet.InternalFacet;

import java.io.IOException;
import java.util.List;

/**
 *
 */
public class InternalFilterFacet extends InternalFacet implements FilterFacet {

    private static final BytesReference STREAM_TYPE = new HashedBytesArray(Strings.toUTF8Bytes("filter"));

    public static void registerStreams() {
        Streams.registerStream(STREAM, STREAM_TYPE);
    }

    static Stream STREAM = new Stream() {
        @Override
        public Facet readFacet(StreamInput in) throws IOException {
            return readFilterFacet(in);
        }
    };

    @Override
    public BytesReference streamType() {
        return STREAM_TYPE;
    }

    private long count;

    InternalFilterFacet() {
    }

    public InternalFilterFacet(String name, long count) {
        super(name);
        this.count = count;
    }

    @Override
    public String getType() {
        return TYPE;
    }

    /**
     * The count of the facet.
     */
    public long getCount() {
        return count;
    }

    @Override
    public Facet reduce(ReduceContext context) {
        List facets = context.facets();
        if (facets.size() == 1) {
            return facets.get(0);
        }
        long count = 0;
        for (Facet facet : facets) {
            count += ((FilterFacet) facet).getCount();
        }
        return new InternalFilterFacet(getName(), count);
    }

    static final class Fields {
        static final XContentBuilderString _TYPE = new XContentBuilderString("_type");
        static final XContentBuilderString COUNT = new XContentBuilderString("count");
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject(getName());
        builder.field(Fields._TYPE, FilterFacet.TYPE);
        builder.field(Fields.COUNT, count);
        builder.endObject();
        return builder;
    }

    public static FilterFacet readFilterFacet(StreamInput in) throws IOException {
        InternalFilterFacet result = new InternalFilterFacet();
        result.readFrom(in);
        return result;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        super.readFrom(in);
        count = in.readVLong();
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeVLong(count);
    }
}