/*
 * 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.action.fieldstats;

import org.elasticsearch.Version;
import org.elasticsearch.action.ShardOperationFailedException;
import org.elasticsearch.action.support.broadcast.BroadcastResponse;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;

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

public class FieldStatsResponse extends BroadcastResponse {
    private Map<String, Map<String, FieldStats>> indicesMergedFieldStats;
    private Map<String, String> conflicts;

    public FieldStatsResponse() {
    }

    public FieldStatsResponse(int totalShards, int successfulShards, int failedShards,
                              List<ShardOperationFailedException> shardFailures,
                              Map<String, Map<String, FieldStats>> indicesMergedFieldStats,
                              Map<String, String> conflicts) {
        super(totalShards, successfulShards, failedShards, shardFailures);
        this.indicesMergedFieldStats = indicesMergedFieldStats;
        this.conflicts = conflicts;
    }

    @Nullable
    public Map<String, FieldStats> getAllFieldStats() {
        return indicesMergedFieldStats.get("_all");
    }

    public Map<String, String> getConflicts() {
        return conflicts;
    }

    public Map<String, Map<String, FieldStats>> getIndicesMergedFieldStats() {
        return indicesMergedFieldStats;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        super.readFrom(in);
        int size = in.readVInt();
        indicesMergedFieldStats = new HashMap<>(size);
        for (int i = 0; i < size; i++) {
            String key = in.readString();
            int indexSize = in.readVInt();
            Map<String, FieldStats> indexFieldStats = new HashMap<>(indexSize);
            indicesMergedFieldStats.put(key, indexFieldStats);
            for (int j = 0; j < indexSize; j++) {
                key = in.readString();
                FieldStats value = FieldStats.readFrom(in);
                indexFieldStats.put(key, value);
            }
        }
        size = in.readVInt();
        conflicts = new HashMap<>(size);
        for (int i = 0; i < size; i++) {
            String key = in.readString();
            String value = in.readString();
            conflicts.put(key, value);
        }

    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeVInt(indicesMergedFieldStats.size());
        for (Map.Entry<String, Map<String, FieldStats>> entry1 : indicesMergedFieldStats.entrySet()) {
            out.writeString(entry1.getKey());
            int size = entry1.getValue().size();
            if (out.getVersion().before(Version.V_5_2_0_UNRELEASED)) {
                // filter fieldstats without min/max information
                for (FieldStats stats : entry1.getValue().values()) {
                    if (stats.hasMinMax() == false) {
                        size--;
                    }
                }
            }
            out.writeVInt(size);
            for (Map.Entry<String, FieldStats> entry2 : entry1.getValue().entrySet()) {
                if (entry2.getValue().hasMinMax() || out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
                    out.writeString(entry2.getKey());
                    entry2.getValue().writeTo(out);
                }
            }
        }
        out.writeVInt(conflicts.size());
        for (Map.Entry<String, String> entry : conflicts.entrySet()) {
            out.writeString(entry.getKey());
            out.writeString(entry.getValue());
        }
    }
}
