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// regarding copyright ownership.  The ASF 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
//
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package org.apache.kudu.client;

import static org.apache.kudu.master.Master.GetTableSchemaRequestPB;
import static org.apache.kudu.master.Master.GetTableSchemaResponsePB;
import static org.apache.kudu.master.Master.TableIdentifierPB;

import java.util.Collection;
import java.util.List;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.protobuf.ByteString;
import com.google.protobuf.Message;
import io.netty.util.Timer;
import org.apache.yetus.audience.InterfaceAudience;

import org.apache.kudu.Schema;
import org.apache.kudu.master.Master;
import org.apache.kudu.util.Pair;

/**
 * RPC to fetch a table's schema
 */
@InterfaceAudience.Private
public class GetTableSchemaRequest extends KuduRpc {
  private final String id;
  private final String name;
  private final List requiredFeatures;

  GetTableSchemaRequest(KuduTable masterTable,
                        String id,
                        String name,
                        Timer timer,
                        long timeoutMillis,
                        boolean requiresAuthzTokenSupport) {
    super(masterTable, timer, timeoutMillis);
    Preconditions.checkArgument(id != null ^ name != null,
        "Only one of table ID or the table name should be provided");
    this.id = id;
    this.name = name;
    this.requiredFeatures = requiresAuthzTokenSupport ?
        ImmutableList.of(Master.MasterFeatures.GENERATE_AUTHZ_TOKEN_VALUE) :
        ImmutableList.of();
  }

  @Override
  Message createRequestPB() {
    final GetTableSchemaRequestPB.Builder builder =
        GetTableSchemaRequestPB.newBuilder();
    TableIdentifierPB.Builder identifierBuilder = TableIdentifierPB.newBuilder();
    if (id != null) {
      identifierBuilder.setTableId(ByteString.copyFromUtf8(id));
    } else {
      Preconditions.checkNotNull(name);
      identifierBuilder.setTableName(name);
    }
    builder.setTable(identifierBuilder.build());
    return builder.build();
  }

  @Override
  String serviceName() {
    return MASTER_SERVICE_NAME;
  }

  @Override
  String method() {
    return "GetTableSchema";
  }

  @Override
  Pair deserialize(CallResponse callResponse,
                                                   String tsUUID) throws KuduException {
    final GetTableSchemaResponsePB.Builder respBuilder = GetTableSchemaResponsePB.newBuilder();
    readProtobuf(callResponse.getPBMessage(), respBuilder);
    Schema schema = ProtobufHelper.pbToSchema(respBuilder.getSchema());
    GetTableSchemaResponse response = new GetTableSchemaResponse(
        timeoutTracker.getElapsedMillis(),
        tsUUID,
        schema,
        respBuilder.getTableId().toStringUtf8(),
        respBuilder.getTableName(),
        respBuilder.getNumReplicas(),
        ProtobufHelper.pbToPartitionSchema(respBuilder.getPartitionSchema(), schema),
        respBuilder.hasAuthzToken() ? respBuilder.getAuthzToken() : null,
        respBuilder.getExtraConfigsMap(),
        respBuilder.hasOwner() ? respBuilder.getOwner() : "",
        respBuilder.hasComment() ? respBuilder.getComment() : "");
    return new Pair(
        response, respBuilder.hasError() ? respBuilder.getError() : null);
  }

  @Override
  Collection getRequiredFeatures() {
    return requiredFeatures;
  }
}