/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.1  (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.openairinterface.org/?page_id=698
 *
 * 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.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

/*! \file
 \brief
 \author  Keliang DU, BUPT
 \date 2020
 \email: contact@openairinterface.org
 */

#include "ULNASTransport.hpp"
#include "3gpp_ts24501.hpp"
#include "logger.hpp"

using namespace nas;

//------------------------------------------------------------------------------
ULNASTransport::ULNASTransport() {
  plain_header = NULL;
  ie_payload_container_type = NULL;
  ie_payload_container = NULL;
  ie_pdu_session_identity_2 = NULL;
  ie_old_pdu_session_identity_2 = NULL;
  ie_request_type = NULL;
  ie_s_nssai = NULL;
  ie_dnn = NULL;
  ie_additional_information = NULL;
  ie_ma_pdu_session_information = NULL;
  ie_release_assistance_indication = NULL;
}

//------------------------------------------------------------------------------
ULNASTransport::~ULNASTransport() {}

//------------------------------------------------------------------------------
void ULNASTransport::setHeader(uint8_t security_header_type) {
  plain_header = new NasMmPlainHeader();
  plain_header->setHeader(EPD_5GS_MM_MSG, security_header_type,
                          UL_NAS_TRANSPORT);
}

//------------------------------------------------------------------------------
void ULNASTransport::setPayload_Container_Type(uint8_t value) {
  ie_payload_container_type = new Payload_Container_Type(0x00, value);
}

//------------------------------------------------------------------------------
uint8_t ULNASTransport::getPayloadContainerType() {
  if (ie_payload_container_type) {
    return ie_payload_container_type->getValue();
  } else {
    return -1;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setPayload_Container(
    std::vector<PayloadContainerEntry> content) {
  ie_payload_container = new Payload_Container(0x00, content);
}

//------------------------------------------------------------------------------
bool ULNASTransport::getPayloadContainer(bstring &content) {
  ie_payload_container->getValue(content);
  return true;
}

//------------------------------------------------------------------------------
bool ULNASTransport::getPayloadContainer(
    std::vector<PayloadContainerEntry> &content) {
  if (ie_payload_container) {
    ie_payload_container->getValue(content);
    return 0;
  } else {
    return -1;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setPDU_Session_Identity_2(uint8_t value) {
  ie_pdu_session_identity_2 = new PDU_Session_Identity_2(0x12, value);
}

//------------------------------------------------------------------------------
uint8_t ULNASTransport::getPduSessionId() {
  if (ie_pdu_session_identity_2) {
    return ie_pdu_session_identity_2->getValue();
  } else {
    return -1;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setOLD_PDU_Session_Identity_2(uint8_t value) {
  ie_old_pdu_session_identity_2 = new PDU_Session_Identity_2(0x59, value);
}

//------------------------------------------------------------------------------
uint8_t ULNASTransport::getOldPduSessionId() {
  if (ie_old_pdu_session_identity_2) {
    return ie_old_pdu_session_identity_2->getValue();
  } else {
    return -1;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setRequest_Type(uint8_t value) {
  ie_request_type = new Request_Type(0x08, value);
}
uint8_t ULNASTransport::getRequestType() {
  if (ie_request_type) {
    return ie_request_type->getValue();
  } else {
    return -1;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setS_NSSAI(SNSSAI_s snssai) {
  ie_s_nssai = new S_NSSAI(0x22, snssai);
}

//------------------------------------------------------------------------------
bool ULNASTransport::getSnssai(SNSSAI_s &snssai) {
  if (ie_s_nssai) {
    ie_s_nssai->getValue(snssai);
    return 0;
  } else {
    return -1;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setDNN(bstring dnn) { ie_dnn = new DNN(0x25, dnn); }

//------------------------------------------------------------------------------
bool ULNASTransport::getDnn(bstring &dnn) {
  if (ie_dnn) {
    ie_dnn->getValue(dnn);
    return true;
  } else {
    return false;
  }
}

//------------------------------------------------------------------------------
void ULNASTransport::setAdditional_Information(uint8_t _length, uint8_t value) {
  ie_additional_information = new Additional_Information(0x24, _length, value);
}

//------------------------------------------------------------------------------
void ULNASTransport::setMA_PDU_Session_Information(uint8_t value) {
  ie_ma_pdu_session_information = new MA_PDU_Session_Information(0x0A, value);
}

//------------------------------------------------------------------------------
void ULNASTransport::setRelease_Assistance_Indication(uint8_t value) {
  ie_release_assistance_indication =
      new Release_Assistance_Indication(0x0F, value);
}

//------------------------------------------------------------------------------
int ULNASTransport::encode2buffer(uint8_t *buf, int len) {
  Logger::nas_mm().debug("encoding ULNASTransport message");
  int encoded_size = 0;
  if (!plain_header) {
    Logger::nas_mm().error("Mandatory IE missing Header");
    return 0;
  }
  if (!(plain_header->encode2buffer(buf, len)))
    return 0;
  encoded_size += 3;
  if (!ie_payload_container_type) {
    Logger::nas_mm().warn("IE ie_payload_container_type is not available");
  } else {
    if (int size = ie_payload_container_type->encode2buffer(
            buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie_payload_container_type  error");
      return 0;
    }
  }
  if (!ie_payload_container) {
    Logger::nas_mm().warn("IE ie_payload_container is not available");
  } else {
    if (int size = ie_payload_container->encode2buffer(buf + encoded_size,
                                                       len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie_payload_container  error");
      return 0;
    }
  }
  if (!ie_pdu_session_identity_2) {
    Logger::nas_mm().warn("IE ie_pdu_session_identity_2 is not available");
  } else {
    if (int size = ie_pdu_session_identity_2->encode2buffer(
            buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie ie_pdu_session_identity_2  error");
      return 0;
    }
  }
  if (!ie_old_pdu_session_identity_2) {
    Logger::nas_mm().warn("IE ie_old_pdu_session_identity_2 is not available");
  } else {
    if (int size = ie_old_pdu_session_identity_2->encode2buffer(
            buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error(
          "encoding ie ie_old_pdu_session_identity_2  error");
      return 0;
    }
  }
  if (!ie_request_type) {
    Logger::nas_mm().warn("IE ie_request_type is not available");
  } else {
    if (int size = ie_request_type->encode2buffer(buf + encoded_size,
                                                  len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie ie_request_type  error");
      return 0;
    }
  }
  if (!ie_s_nssai) {
    Logger::nas_mm().warn("IE ie_s_nssai is not available");
  } else {
    if (int size =
            ie_s_nssai->encode2buffer(buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie ie_s_nssai  error");
      return 0;
    }
  }
  if (!ie_dnn) {
    Logger::nas_mm().warn("IE ie_dnn is not available");
  } else {
    if (int size =
            ie_dnn->encode2buffer(buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie ie_dnn  error");
      return 0;
    }
  }
  if (!ie_additional_information) {
    Logger::nas_mm().warn("IE ie_additional_information is not available");
  } else {
    if (int size = ie_additional_information->encode2buffer(
            buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error("encoding ie ie_additional_information  error");
      return 0;
    }
  }
  if (!ie_ma_pdu_session_information) {
    Logger::nas_mm().warn("IE ie_ma_pdu_session_information is not available");
  } else {
    if (int size = ie_ma_pdu_session_information->encode2buffer(
            buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error(
          "encoding ie ie_ma_pdu_session_information  error");
      return 0;
    }
  }
  if (!ie_release_assistance_indication) {
    Logger::nas_mm().warn(
        "IE ie_release_assistance_indication is not available");
  } else {
    if (int size = ie_release_assistance_indication->encode2buffer(
            buf + encoded_size, len - encoded_size)) {
      encoded_size += size;
    } else {
      Logger::nas_mm().error(
          "encoding ie ie_release_assistance_indication  error");
      return 0;
    }
  }
  Logger::nas_mm().debug("encoded ULNASTransport message len(%d)",
                         encoded_size);
  return 1;
}

//------------------------------------------------------------------------------
int ULNASTransport::decodefrombuffer(NasMmPlainHeader *header, uint8_t *buf,
                                     int len) {
  Logger::nas_mm().debug("Decoding ULNASTransport message");
  int decoded_size = 3;
  plain_header = header;
  ie_payload_container_type = new Payload_Container_Type();
  decoded_size += ie_payload_container_type->decodefrombuffer(
      buf + decoded_size, len - decoded_size, false);
  ie_payload_container = new Payload_Container();
  decoded_size += ie_payload_container->decodefrombuffer(
      buf + decoded_size, len - decoded_size, false,
      ie_payload_container_type->getValue());
  Logger::nas_mm().debug("Decoded_size (%d)", decoded_size);
  uint8_t octet = *(buf + decoded_size);
  Logger::nas_mm().debug("First option IEI (0x%x)", octet);
  bool flag = false;
  while ((octet != 0x0)) {
    switch ((octet & 0xf0) >> 4) {
    case 0x8: {
      Logger::nas_mm().debug("Decoding IEI (0x8)");
      ie_request_type = new Request_Type();
      decoded_size += ie_request_type->decodefrombuffer(
          buf + decoded_size, len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    case 0xA: {
      Logger::nas_mm().debug("Decoding IEI (0xA)");
      ie_ma_pdu_session_information = new MA_PDU_Session_Information();
      decoded_size += ie_ma_pdu_session_information->decodefrombuffer(
          buf + decoded_size, len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    case 0xF: {
      Logger::nas_mm().debug("Decoding IEI (0xF)");
      ie_release_assistance_indication = new Release_Assistance_Indication();
      decoded_size += ie_release_assistance_indication->decodefrombuffer(
          buf + decoded_size, len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    default: {
      flag = true;
    }
    }
    switch (octet) {
    case 0x12: {
      Logger::nas_mm().debug("Decoding IEI (0x12)");
      ie_pdu_session_identity_2 = new PDU_Session_Identity_2();
      decoded_size += ie_pdu_session_identity_2->decodefrombuffer(
          buf + decoded_size, len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    case 0x59: {
      Logger::nas_mm().debug("Decoding IEI (0x59)");
      ie_old_pdu_session_identity_2 = new PDU_Session_Identity_2();
      decoded_size += ie_old_pdu_session_identity_2->decodefrombuffer(
          buf + decoded_size, len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    case 0x22: {
      Logger::nas_mm().debug("Decoding IEI (0x22)");
      ie_s_nssai = new S_NSSAI();
      decoded_size += ie_s_nssai->decodefrombuffer(buf + decoded_size,
                                                   len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    case 0x25: {
      Logger::nas_mm().debug("Decoding IEI (0x25)");
      ie_dnn = new DNN();
      decoded_size += ie_dnn->decodefrombuffer(buf + decoded_size,
                                               len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    case 0x24: {
      Logger::nas_mm().debug("Decoding IEI (0x24)");
      ie_additional_information = new Additional_Information();
      decoded_size += ie_additional_information->decodefrombuffer(
          buf + decoded_size, len - decoded_size, true);
      octet = *(buf + decoded_size);
      Logger::nas_mm().debug("Next IEI (0x%x)", octet);
    } break;
    default: {
      if (flag) {
        Logger::nas_mm().debug("Unknown IEI (0x%x)", octet);
        decoded_size++;
		*(buf + decoded_size) = 0x00;
        octet = *(buf + decoded_size);
        Logger::nas_mm().debug("Next IEI (0x%x)", octet);
      }
    }
    }
    flag = false;
  }
  Logger::nas_mm().debug("decoded ULNASTransport message len(%d)",
                         decoded_size);
}
