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package com.litongjava.redis.serializer;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.nustaq.serialization.FSTObjectInput;
import org.nustaq.serialization.FSTObjectOutput;

import lombok.extern.slf4j.Slf4j;
import redis.clients.jedis.util.SafeEncoder;

/**
 * FstSerializer.
 */
@Slf4j
public class FstSerializer implements ISerializer {

  public static final ISerializer me = new FstSerializer();

  public byte[] keyToBytes(String key) {
    return SafeEncoder.encode(key);
  }

  public String keyFromBytes(byte[] bytes) {
    return SafeEncoder.encode(bytes);
  }

  public byte[] fieldToBytes(Object field) {
    return valueToBytes(field);
  }

  public Object fieldFromBytes(byte[] bytes) {
    return valueFromBytes(bytes);
  }

  public byte[] valueToBytes(Object value) {
    FSTObjectOutput fstOut = null;
    try {
      ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
      fstOut = new FSTObjectOutput(bytesOut);
      fstOut.writeObject(value);
      fstOut.flush();
      return bytesOut.toByteArray();
    } catch (Exception e) {
      throw new RuntimeException(e);
    } finally {
      if (fstOut != null)
        try {
          fstOut.close();
        } catch (IOException e) {
          log.error(e.getMessage(), e);
        }
    }
  }

  public Object valueFromBytes(byte[] bytes) {
    if (bytes == null || bytes.length == 0)
      return null;

    FSTObjectInput fstInput = null;
    try {
      fstInput = new FSTObjectInput(new ByteArrayInputStream(bytes));
      return fstInput.readObject();
    } catch (Exception e) {
      throw new RuntimeException(e);
    } finally {
      if (fstInput != null)
        try {
          fstInput.close();
        } catch (IOException e) {
          log.error(e.getMessage(), e);
        }
    }
  }
}