/*
 * SPDX-License-Identifier: LicenseRef-CSSL-1.0
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "TrackingAreaIdentityList.h"

int decode_tracking_area_identity_list(TrackingAreaIdentityList *trackingareaidentitylist, uint8_t iei, uint8_t *buffer, uint32_t len)
{
  int decoded = 0;
  uint8_t ielen = 0;

  if (iei > 0) {
    CHECK_IEI_DECODER(iei, *buffer);
    decoded++;
  }

  ielen = *(buffer + decoded);
  decoded++;
  CHECK_LENGTH_DECODER(len - decoded, ielen);
  trackingareaidentitylist->typeoflist = (*(buffer + decoded) >> 5) & 0x3;
  trackingareaidentitylist->numberofelements = *(buffer + decoded) & 0x1f;
  decoded++;
  trackingareaidentitylist->mccdigit2 = (*(buffer + decoded) >> 4) & 0xf;
  trackingareaidentitylist->mccdigit1 = *(buffer + decoded) & 0xf;
  decoded++;
  trackingareaidentitylist->mncdigit3 = (*(buffer + decoded) >> 4) & 0xf;
  trackingareaidentitylist->mccdigit3 = *(buffer + decoded) & 0xf;
  decoded++;
  trackingareaidentitylist->mncdigit2 = (*(buffer + decoded) >> 4) & 0xf;
  trackingareaidentitylist->mncdigit1 = *(buffer + decoded) & 0xf;
  decoded++;
  //IES_DECODE_U16(trackingareaidentitylist->tac, *(buffer + decoded));
  IES_DECODE_U16(buffer, decoded, trackingareaidentitylist->tac);
#if defined (NAS_DEBUG)
  dump_tracking_area_identity_list_xml(trackingareaidentitylist, iei);
#endif
  return decoded;
}

int encode_tracking_area_identity_list(TrackingAreaIdentityList *trackingareaidentitylist, uint8_t iei, uint8_t *buffer, uint32_t len)
{
  uint8_t *lenPtr;
  uint32_t encoded = 0;
  /* Checking IEI and pointer */
  CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, TRACKING_AREA_IDENTITY_LIST_MINIMUM_LENGTH, len);
#if defined (NAS_DEBUG)
  dump_tracking_area_identity_list_xml(trackingareaidentitylist, iei);
#endif

  if (iei > 0) {
    *buffer = iei;
    encoded++;
  }

  lenPtr  = (buffer + encoded);
  encoded ++;
  *(buffer + encoded) = 0x00 |
                        ((trackingareaidentitylist->typeoflist & 0x3) << 5) |
                        (trackingareaidentitylist->numberofelements & 0x1f);
  encoded++;
  *(buffer + encoded) = 0x00 | ((trackingareaidentitylist->mccdigit2 & 0xf) << 4) |
                        (trackingareaidentitylist->mccdigit1 & 0xf);
  encoded++;
  *(buffer + encoded) = 0x00 | ((trackingareaidentitylist->mncdigit3 & 0xf) << 4) |
                        (trackingareaidentitylist->mccdigit3 & 0xf);
  encoded++;
  *(buffer + encoded) = 0x00 | ((trackingareaidentitylist->mncdigit2 & 0xf) << 4) |
                        (trackingareaidentitylist->mncdigit1 & 0xf);
  encoded++;
  IES_ENCODE_U16(buffer, encoded, trackingareaidentitylist->tac);
  *lenPtr = encoded - 1 - ((iei > 0) ? 1 : 0);
  return encoded;
}

void dump_tracking_area_identity_list_xml(TrackingAreaIdentityList *trackingareaidentitylist, uint8_t iei)
{
  printf("<Tracking Area Identity List>\n");

  if (iei > 0)
    /* Don't display IEI if = 0 */
    printf("    <IEI>0x%X</IEI>\n", iei);

  printf("    <Type of list>%u</Type of list>\n", trackingareaidentitylist->typeoflist);
  /* LW: number of elements is coded as N-1 (0 -> 1 element, 1 -> 2 elements...),
   *  see 3GPP TS 24.301, section 9.9.3.33.1 */
  printf("    <Number of elements>%d</Number of elements>\n", trackingareaidentitylist->numberofelements + 1);
  printf("    <MCC digit 2>%u</MCC digit 2>\n", trackingareaidentitylist->mccdigit2);
  printf("    <MCC digit 1>%u</MCC digit 1>\n", trackingareaidentitylist->mccdigit1);
  printf("    <MNC digit 3>%u</MNC digit 3>\n", trackingareaidentitylist->mncdigit3);
  printf("    <MCC digit 3>%u</MCC digit 3>\n", trackingareaidentitylist->mccdigit3);
  printf("    <MNC digit 2>%u</MNC digit 2>\n", trackingareaidentitylist->mncdigit2);
  printf("    <MNC digit 1>%u</MNC digit 1>\n", trackingareaidentitylist->mncdigit1);
  printf("    <TAC>0x%.4x</TAC>\n", trackingareaidentitylist->tac);
  printf("</Tracking Area Identity List>\n");
}