/*
 * 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.BsonType;
import com.eightkdata.mongowp.exceptions.BadValueException;
import com.eightkdata.mongowp.exceptions.InvalidReplicaSetConfigException;
import com.eightkdata.mongowp.exceptions.MongoException;
import com.eightkdata.mongowp.exceptions.TypesMismatchException;
import com.eightkdata.mongowp.fields.BooleanField;
import com.eightkdata.mongowp.server.api.impl.AbstractNotAliasableCommand;
import com.eightkdata.mongowp.server.api.tools.Empty;
import com.eightkdata.mongowp.utils.BsonReaderTool;
import com.torodb.mongodb.commands.pojos.ReplicaSetConfig;
import com.torodb.mongodb.commands.signatures.repl.ReplSetReconfigCommand.ReplSetReconfigArgument;

import javax.annotation.concurrent.Immutable;

/**
 *
 */
public class ReplSetReconfigCommand
    extends AbstractNotAliasableCommand<ReplSetReconfigArgument, Empty> {

  private static final String COMMAND_FIELD_NAME = "replSetReconfig";

  public static final ReplSetReconfigCommand INSTANCE = new ReplSetReconfigCommand();

  private ReplSetReconfigCommand() {
    super(COMMAND_FIELD_NAME);
  }

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

  @Override
  public boolean canChangeReplicationState() {
    return true;
  }

  @Override
  public ReplSetReconfigArgument unmarshallArg(BsonDocument requestDoc)
      throws InvalidReplicaSetConfigException, BadValueException, TypesMismatchException {
    return ReplSetReconfigArgument.unmarshall(requestDoc);
  }

  @Override
  public BsonDocument marshallArg(ReplSetReconfigArgument request) {
    throw new UnsupportedOperationException("Not supported.");
  }

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

  @Override
  public BsonDocument marshallResult(Empty reply) {
    return null;
  }

  @Override
  public Empty unmarshallResult(BsonDocument resultDoc) {
    return Empty.getInstance();
  }

  @Immutable
  public static class ReplSetReconfigArgument {

    private static final BooleanField FORCE_FIELD = new BooleanField("force");

    private final ReplicaSetConfig config;
    private final boolean force;

    public ReplSetReconfigArgument(ReplicaSetConfig config, boolean force) {
      this.config = config;
      this.force = force;
    }

    public ReplicaSetConfig getConfig() {
      return config;
    }

    public boolean isForce() {
      return force;
    }

    private static ReplSetReconfigArgument unmarshall(BsonDocument doc)
        throws BadValueException, InvalidReplicaSetConfigException, TypesMismatchException {
      if (doc.get(COMMAND_FIELD_NAME).getType().equals(BsonType.DOCUMENT)) {
        throw new BadValueException("no configuration specified");
      }
      ReplicaSetConfig config;
      try {
        config = ReplicaSetConfig.fromDocument(
            BsonReaderTool.getDocument(doc, COMMAND_FIELD_NAME)
        );
      } catch (MongoException ex) {
        throw new InvalidReplicaSetConfigException(ex.getLocalizedMessage(), ex);
      }
      boolean force = BsonReaderTool.getBoolean(doc, FORCE_FIELD, false);

      return new ReplSetReconfigArgument(config, force);
    }
  }

}