/*
 * 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.indices.recovery;

import com.google.common.collect.Maps;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.store.StoreFileMetaData;
import org.elasticsearch.transport.TransportRequest;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

/**
 *
 */
public class StartRecoveryRequest extends TransportRequest {

    private static final AtomicLong recoveryIdGenerator = new AtomicLong();

    private long recoveryId;

    private ShardId shardId;

    private DiscoveryNode sourceNode;

    private DiscoveryNode targetNode;

    private boolean markAsRelocated;

    private Map<String, StoreFileMetaData> existingFiles;

    StartRecoveryRequest() {
    }

    /**
     * Start recovery request.
     *
     * @param shardId
     * @param sourceNode      The node to recover from
     * @param targetNode      The node to recover to
     * @param markAsRelocated
     * @param existingFiles
     */
    public StartRecoveryRequest(ShardId shardId, DiscoveryNode sourceNode, DiscoveryNode targetNode, boolean markAsRelocated, Map<String, StoreFileMetaData> existingFiles) {
        this.recoveryId = recoveryIdGenerator.incrementAndGet();
        this.shardId = shardId;
        this.sourceNode = sourceNode;
        this.targetNode = targetNode;
        this.markAsRelocated = markAsRelocated;
        this.existingFiles = existingFiles;
    }

    public long recoveryId() {
        return this.recoveryId;
    }

    public ShardId shardId() {
        return shardId;
    }

    public DiscoveryNode sourceNode() {
        return sourceNode;
    }

    public DiscoveryNode targetNode() {
        return targetNode;
    }

    public boolean markAsRelocated() {
        return markAsRelocated;
    }

    public Map<String, StoreFileMetaData> existingFiles() {
        return existingFiles;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        super.readFrom(in);
        recoveryId = in.readLong();
        shardId = ShardId.readShardId(in);
        sourceNode = DiscoveryNode.readNode(in);
        targetNode = DiscoveryNode.readNode(in);
        markAsRelocated = in.readBoolean();
        int size = in.readVInt();
        existingFiles = Maps.newHashMapWithExpectedSize(size);
        for (int i = 0; i < size; i++) {
            StoreFileMetaData md = StoreFileMetaData.readStoreFileMetaData(in);
            existingFiles.put(md.name(), md);
        }
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeLong(recoveryId);
        shardId.writeTo(out);
        sourceNode.writeTo(out);
        targetNode.writeTo(out);
        out.writeBoolean(markAsRelocated);
        out.writeVInt(existingFiles.size());
        for (StoreFileMetaData md : existingFiles.values()) {
            md.writeTo(out);
        }
    }
}
