part of emulator;

class Packet {

  Uint8List data;

  Uint8List body;

  int header;

  int length;

  String bodyReadable;

  Packet(Uint8List this.data){

    ByteData bytes = data.buffer.asByteData(0);

    try{
      length = bytes.getUint32(0);
      header = bytes.getUint16(4);
      body = _getContent(data, 6, length);
      bodyReadable = _bodyToString(body.toList()).toString();
    }catch(error){
      throw new Error(error);
    }
  }

  StringBuffer _bodyToString(List<int> bodyInCharacters){
    StringBuffer result = new StringBuffer();

    bodyInCharacters.forEach((byte) {
      if(byte < 31){
        result.write('[$byte]');
      }else{
        result.write(new String.fromCharCode(byte));
      }
    });

    return result;
  }

  Uint8List _getContent(Uint8List data, int start, int end){
    List<int> tempList = new List();

    int i = 1;

    data.forEach((byte) {
      if(i >= start && i <= end){
        tempList.add(byte);
      }
      i++;
    });

    return new Uint8List.fromList(tempList);
  }

  toString(){
    return '[HEADER: $header][LENGTH: $length][BODY: $bodyReadable]';
  }
}