/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.action.get;

import org.opensearch.action.ActionResponse;
import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.common.io.stream.StreamOutput;

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

/**
 * Transport response for multi get shards.
 *
 * @opensearch.internal
 */
public class MultiGetShardResponse extends ActionResponse {

    final List<Integer> locations;
    final List<GetResponse> responses;
    final List<MultiGetResponse.Failure> failures;

    MultiGetShardResponse() {
        locations = new ArrayList<>();
        responses = new ArrayList<>();
        failures = new ArrayList<>();
    }

    MultiGetShardResponse(StreamInput in) throws IOException {
        super(in);
        int size = in.readVInt();
        locations = new ArrayList<>(size);
        responses = new ArrayList<>(size);
        failures = new ArrayList<>(size);
        for (int i = 0; i < size; i++) {
            locations.add(in.readVInt());
            if (in.readBoolean()) {
                responses.add(new GetResponse(in));
            } else {
                responses.add(null);
            }
            if (in.readBoolean()) {
                failures.add(new MultiGetResponse.Failure(in));
            } else {
                failures.add(null);
            }
        }
    }

    public void add(int location, GetResponse response) {
        locations.add(location);
        responses.add(response);
        failures.add(null);
    }

    public void add(int location, MultiGetResponse.Failure failure) {
        locations.add(location);
        responses.add(null);
        failures.add(failure);
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeVInt(locations.size());
        for (int i = 0; i < locations.size(); i++) {
            out.writeVInt(locations.get(i));
            if (responses.get(i) == null) {
                out.writeBoolean(false);
            } else {
                out.writeBoolean(true);
                responses.get(i).writeTo(out);
            }
            if (failures.get(i) == null) {
                out.writeBoolean(false);
            } else {
                out.writeBoolean(true);
                failures.get(i).writeTo(out);
            }
        }
    }
}