/*
 * 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.exceptions.NoSuchKeyException;
import com.eightkdata.mongowp.exceptions.TypesMismatchException;
import com.eightkdata.mongowp.fields.IntField;
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.torodb.mongodb.commands.signatures.repl.ReplSetFreezeCommand.ReplSetFreezeArgument;
import com.torodb.mongodb.commands.signatures.repl.ReplSetFreezeCommand.ReplSetFreezeReply;

import javax.annotation.Nullable;

/**
 * <em>Freeze</em> or <em>unfreeze</em> this node.
 *
 * This node will not attempt to become primary until the time period specified expires. Calling
 * {replSetFreeze:0} will unfreeze the node.
 */
public class ReplSetFreezeCommand
    extends AbstractNotAliasableCommand<ReplSetFreezeArgument, ReplSetFreezeReply> {

  private static final IntField COMMAND_FIELD = new IntField("replSetFreeze");

  public static final ReplSetFreezeCommand INSTANCE = new ReplSetFreezeCommand();

  private ReplSetFreezeCommand() {
    super(COMMAND_FIELD.getFieldName());
  }

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

  @Override
  public ReplSetFreezeArgument unmarshallArg(BsonDocument requestDoc)
      throws TypesMismatchException, NoSuchKeyException {
    return ReplSetFreezeArgument.unmarshall(requestDoc);
  }

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

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

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

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

  public static class ReplSetFreezeArgument {

    private final int freezeSecs;

    public ReplSetFreezeArgument(int freezeSecs) {
      this.freezeSecs = freezeSecs;
    }

    public int getFreezeSecs() {
      return freezeSecs;
    }

    private static ReplSetFreezeArgument unmarshall(BsonDocument doc)
        throws TypesMismatchException, NoSuchKeyException {
      int freezeSecs = BsonReaderTool.getInteger(doc, COMMAND_FIELD);

      return new ReplSetFreezeArgument(freezeSecs);
    }
  }

  public static class ReplSetFreezeReply {

    private static final StringField INFO_FIELD = new StringField("info");
    private static final StringField WARNING_FIELD = new StringField("warning");

    private final String info;
    private final String warning;

    public ReplSetFreezeReply(@Nullable String info, @Nullable String warning) {
      this.info = info;
      this.warning = warning;
    }

    public String getInfo() {
      return info;
    }

    public String getWarning() {
      return warning;
    }

    private BsonDocument marshall() {
      BsonDocumentBuilder builder = new BsonDocumentBuilder();

      if (info != null) {
        builder.append(INFO_FIELD, info);
      }
      if (warning != null) {
        builder.append(WARNING_FIELD, warning);
      }

      return builder.build();
    }
  }

}