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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed 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 io.atomix.collections.internal;

import io.atomix.catalyst.buffer.BufferInput;
import io.atomix.catalyst.buffer.BufferOutput;
import io.atomix.catalyst.serializer.CatalystSerializable;
import io.atomix.catalyst.serializer.SerializableTypeResolver;
import io.atomix.catalyst.serializer.Serializer;
import io.atomix.catalyst.serializer.SerializerRegistry;
import io.atomix.copycat.Command;
import io.atomix.copycat.Query;

/**
 * Distributed queue commands.
 * 
 * This class reserves serializable type IDs {@code 90} through {@code 99}
 *
 * @author Jordan Halterman
 */
public class QueueCommands {

  private QueueCommands() {
  }

  /**
   * Abstract queue command.
   */
  private static abstract class QueueCommand implements Command, CatalystSerializable {
    @Override
    public CompactionMode compaction() {
      return CompactionMode.QUORUM;
    }

    @Override
    public void writeObject(BufferOutput buffer, Serializer serializer) {
    }

    @Override
    public void readObject(BufferInput buffer, Serializer serializer) {
    }
  }

  /**
   * Abstract queue query.
   */
  private static abstract class QueueQuery implements Query, CatalystSerializable {
    protected ConsistencyLevel consistency;

    protected QueueQuery() {
    }

    protected QueueQuery(ConsistencyLevel consistency) {
      this.consistency = consistency;
    }

    @Override
    public void writeObject(BufferOutput output, Serializer serializer) {
      if (consistency != null) {
        output.writeByte(consistency.ordinal());
      } else {
        output.writeByte(-1);
      }
    }

    @Override
    public void readObject(BufferInput input, Serializer serializer) {
      int ordinal = input.readByte();
      if (ordinal != -1) {
        consistency = ConsistencyLevel.values()[ordinal];
      }
    }
  }

  /**
   * Abstract value command.
   */
  public static abstract class ValueCommand extends QueueCommand {
    protected Object value;

    protected ValueCommand() {
    }

    protected ValueCommand(Object value) {
      this.value = value;
    }

    /**
     * Returns the value.
     */
    public Object value() {
      return value;
    }

    @Override
    public void writeObject(BufferOutput buffer, Serializer serializer) {
      serializer.writeObject(value, buffer);
    }

    @Override
    public void readObject(BufferInput buffer, Serializer serializer) {
      value = serializer.readObject(buffer);
    }
  }

  /**
   * Abstract value query.
   */
  public static abstract class ValueQuery extends QueueQuery {
    protected Object value;

    protected ValueQuery() {
    }

    protected ValueQuery(Object value) {
      this.value = value;
    }

    protected ValueQuery(Object value, ConsistencyLevel consistency) {
      super(consistency);
      this.value = value;
    }

    /**
     * Returns the value.
     */
    public Object value() {
      return value;
    }

    @Override
    public void writeObject(BufferOutput buffer, Serializer serializer) {
      super.writeObject(buffer, serializer);
      serializer.writeObject(value, buffer);
    }

    @Override
    public void readObject(BufferInput buffer, Serializer serializer) {
      super.readObject(buffer, serializer);
      value = serializer.readObject(buffer);
    }
  }

  /**
   * Contains value command.
   */
  public static class Contains extends ValueQuery {
    public Contains() {
    }

    public Contains(Object value) {
      super(value);
    }

    public Contains(Object value, ConsistencyLevel consistency) {
      super(value, consistency);
    }
  }

  /**
   * Add command.
   */
  public static class Add extends ValueCommand {
    public Add() {
    }

    public Add(Object value) {
      super(value);
    }
  }

  /**
   * Offer
   */
  public static class Offer extends ValueCommand {
    public Offer() {
    }

    public Offer(Object value) {
      super(value);
    }
  }

  /**
   * Peek query.
   */
  public static class Peek extends QueueQuery