/*
 * ToroDB
 * Copyright © 2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.mongodb.commands.signatures.repl;

import com.eightkdata.mongowp.bson.BsonDocument;
import com.eightkdata.mongowp.bson.utils.DefaultBsonValues;
import com.eightkdata.mongowp.exceptions.TypesMismatchException;
import com.eightkdata.mongowp.fields.HostAndPortField;
import com.eightkdata.mongowp.fields.StringField;
import com.eightkdata.mongowp.server.api.impl.AbstractNotAliasableCommand;
import com.eightkdata.mongowp.utils.BsonDocumentBuilder;
import com.eightkdata.mongowp.utils.BsonReaderTool;
import com.google.common.net.HostAndPort;
import com.torodb.mongodb.commands.signatures.repl.ReplSetSyncFromCommand.ReplSetSyncFromReply;

import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

/**
 *
 */
public class ReplSetSyncFromCommand
    extends AbstractNotAliasableCommand<HostAndPort, ReplSetSyncFromReply> {

  public static final ReplSetSyncFromCommand INSTANCE = new ReplSetSyncFromCommand();

  private ReplSetSyncFromCommand() {
    super("replSetSyncFrom");
  }

  @Override
  public Class<? extends HostAndPort> getArgClass() {
    return HostAndPort.class;
  }

  @Override
  public HostAndPort unmarshallArg(BsonDocument requestDoc) throws TypesMismatchException {
    return BsonReaderTool.getHostAndPort(
        requestDoc,
        getCommandName(),
        null
    );
  }

  @Override
  public BsonDocument marshallArg(HostAndPort request) {
    return DefaultBsonValues.newDocument(getCommandName(), DefaultBsonValues.newString(request
        .toString()));
  }

  @Override
  public Class<? extends ReplSetSyncFromReply> getResultClass() {
    return ReplSetSyncFromReply.class;
  }

  @Override
  public BsonDocument marshallResult(ReplSetSyncFromReply reply) {
    return reply.marshall();
  }

  @Override
  public ReplSetSyncFromReply unmarshallResult(BsonDocument resultDoc) {
    throw new UnsupportedOperationException("Not supported");
  }

  @Immutable
  public static class ReplSetSyncFromReply {

    private static final HostAndPortField PREV_SYNC_TARGET_FIELD = new HostAndPortField(
        "prevSyncTarget");
    private static final HostAndPortField SYNC_FROM_REQUESTED_FIELD = new HostAndPortField(
        "syncFromRequested");
    private static final StringField WARNING_FIELD = new StringField("warning");

    @Nullable
    private final HostAndPort prevSyncTarget;
    @Nullable
    private final HostAndPort syncFromRequested;
    @Nullable
    private final String warning;

    public ReplSetSyncFromReply(
        @Nullable HostAndPort prevSyncTarget,
        @Nullable HostAndPort syncFromRequested,
        @Nullable String warning) {
      this.prevSyncTarget = prevSyncTarget;
      this.syncFromRequested = syncFromRequested;
      this.warning = warning;
    }

    @Nullable
    public HostAndPort getPrevSyncTarget() {
      return prevSyncTarget;
    }

    @Nullable
    public String getWarning() {
      return warning;
    }

    @Nullable
    public HostAndPort getSyncFromRequested() {
      return syncFromRequested;
    }

    private BsonDocument marshall() {
      BsonDocumentBuilder result = new BsonDocumentBuilder();
      if (prevSyncTarget != null) {
        result.append(PREV_SYNC_TARGET_FIELD, prevSyncTarget);
      }

      if (warning != null) {
        result.append(WARNING_FIELD, warning);
      }

      if (syncFromRequested != null) {
        result.append(SYNC_FROM_REQUESTED_FIELD, syncFromRequested);
      }

      return result.build();
    }
  }

}