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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.rio.net;

import java.nio.ByteBuffer;

import javax.xml.bind.DatatypeConverter;

/**
 * @author [email protected] (Marcio Endo)
 */
abstract class Segment {

  public static Segment newByte(int value) {
    return new Byte(value);
  }

  public static Segment newByteArray(byte[] value) {
    return new ByteArray(value);
  }

  public static Segment newInt(int value) {
    return new Int(value);
  }

  public static Segment newShort(int value) {
    return new Short(value);
  }

  public static Segment newZero(int length) {
    return new Zero(length);
  }

  public abstract void accept(ByteBuffer buffer);

  public abstract int size();

  void accept(StringBuilder sb) {
    sb.append("  ");
    sb.append(getClass().getSimpleName());
    sb.append(':');
    sb.append(' ');
    sb.append(valueToString());
  }

  abstract String valueToString();

  private static class Byte extends Segment {

    private final byte value;

    public Byte(int value) {
      this.value = (byte) value;
    }

    @Override
    public void accept(ByteBuffer buffer) {
      buffer.put(value);
    }

    @Override
    public int size() {
      return 1;
    }

    @Override
    String valueToString() {
      return "0x" + Integer.toHexString(value);
    }

  }

  private static class ByteArray extends Segment {

    private final byte[] value;

    public ByteArray(byte[] value) {
      this.value = value;
    }

    @Override
    public void accept(ByteBuffer buffer) {
      buffer.put(value);
    }

    @Override
    public int size() {
      return value.length;
    }

    @Override
    String valueToString() {
      return DatatypeConverter.printHexBinary(value);
    }

  }

  private static class Int extends Segment {

    private final int value;

    public Int(int value) {
      this.value = value;
    }

    @Override
    public void accept(ByteBuffer buffer) {
      buffer.putInt(value);
    }

    @Override
    public int size() {
      return 4;
    }

    @Override
    String valueToString() {
      return "0x" + Integer.toHexString(value);
    }

  }

  private static class Short extends Segment {

    private final short value;

    public Short(int value) {
      this.value = (short) value;
    }

    @Override
    public void accept(ByteBuffer buffer) {
      buffer.putShort(value);
    }

    @Override
    public int size() {
      return 2;
    }

    @Override
    String valueToString() {
      return "0x" + Integer.toHexString(value);
    }

  }

  private static class Zero extends Segment {

    private final int length;
    private byte zero;

    public Zero(int length) {
      this.length = length;
    }

    @Override
    public void accept(ByteBuffer buffer) {
      for (int i = 0; i < length; i++) {
        buffer.put(zero);
      }
    }

    @Override
    public int size() {
      return length;
    }

    @Override
    String valueToString() {
      return "0x" + new String(new byte[length]);
    }

  }

}