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package io.trane.ndbc.postgres.netty4;

import java.nio.charset.Charset;

import io.netty.buffer.ByteBuf;

final class BufferReader implements io.trane.ndbc.proto.BufferReader {

  private final Charset charset;
  private final ByteBuf bb;

  public BufferReader(final Charset charset, final ByteBuf bb) {
    super();
    this.charset = charset;
    this.bb = bb;
  }

  @Override
  public final int readInt() {
    return bb.readInt();
  }

  @Override
  public final short readShort() {
    return bb.readShort();
  }

  @Override
  public final String readCString() {
    final int stringSize = bb.bytesBefore((byte) 0);
    final String string = readString(stringSize);
    bb.skipBytes(1); // skip 0
    return string;
  }

  @Override
  public final String readCString(final int length) {
    final String string = readString(length);
    bb.skipBytes(1); // 0
    return string;
  }

  @Override
  public final String readString() {
    return readString(bb.readableBytes());
  }

  @Override
  public final String readString(final int length) {
    final byte[] b = new byte[length];
    bb.readBytes(b);
    final String string = new String(b, charset);
    return string;
  }

  @Override
  public final int readableBytes() {
    return bb.readableBytes();
  }

  @Override
  public final byte readByte() {
    return bb.readByte();
  }

  @Override
  public final byte[] readBytes() {
    return readBytes(bb.readableBytes());
  }

  @Override
  public final byte[] readBytes(final int length) {
    final byte[] bytes = new byte[length];
    bb.readBytes(bytes);
    return bytes;
  }

  @Override
  public final BufferReader readSlice(final int length) {
    return new BufferReader(charset, bb.readSlice(length));
  }

  @Override
  public final int[] readInts() {
    return readInts(bb.readableBytes() / 4);
  }

  @Override
  public final int[] readInts(final int length) {
    final int[] ints = new int[length];
    for (int i = 0; i < length; i++)
      ints[i] = bb.readInt();
    return ints;
  }

  @Override
  public final short[] readShorts() {
    return readShorts(bb.readableBytes() / 2);
  }

  @Override
  public final short[] readShorts(final int length) {
    final short[] shorts = new short[length];
    for (int i = 0; i < length; i++)
      shorts[i] = bb.readShort();
    return shorts;
  }

  @Override
  public final Long readLong() {
    return bb.readLong();
  }

  @Override
  public final Float readFloat() {
    return bb.readFloat();
  }

  @Override
  public final Double readDouble() {
    return bb.readDouble();
  }

  @Override
  public final void retain() {
    bb.retain();
  }

  @Override
  public final void release() {
    bb.release();
  }

  @Override
  public final void markReaderIndex() {
    bb.markReaderIndex();
  }

  @Override
  public final void resetReaderIndex() {
    bb.resetReaderIndex();
  }
}