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package cn.leancloud.push.lite.utils;

import android.util.Log;

import com.google.protobuf.InvalidProtocolBufferException;

import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

import cn.leancloud.push.lite.proto.CommandPacket;
import cn.leancloud.push.lite.proto.Messages;
import cn.leancloud.push.lite.proto.PushAckPacket;

public class PacketAssembler {
  private static final String TAG = PacketAssembler.class.getSimpleName();
//  static AtomicInteger acu = new AtomicInteger(-65536);
  private static PacketAssembler instance = new PacketAssembler();
  public static PacketAssembler getInstance() {
    return instance;
  }

//  public static int getNextIMRequestId() {
//    int val = acu.incrementAndGet();
//    if (val > 65535) {
//      while (val > 65535 && !acu.compareAndSet(val, -65536)) {
//        val = acu.get();
//      }
//      return val;
//    } else {
//      return val;
//    }
//  }

  public CommandPacket assemblePushAckPacket(String installationId, List messageIds) {
    PushAckPacket pushAckPacket = new PushAckPacket();
    pushAckPacket.setInstallationId(installationId);
    pushAckPacket.setMessageIds(messageIds);
    return pushAckPacket;
  }

  public Messages.GenericCommand disassemblePacket(ByteBuffer bytes) {
    try {
      return Messages.GenericCommand.parseFrom(bytes);
    } catch (InvalidProtocolBufferException ex) {
      Log.e(TAG, "failed to disassemble packet.", ex);
      return null;
    }
  }
}