/*
 * 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
 */

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


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "EpsQualityOfService.h"

static int decode_eps_qos_bit_rates(EpsQoSBitRates* epsqosbitrates, const uint8_t *buffer)
{
  int decoded = 0;
  epsqosbitrates->maxBitRateForUL = *(buffer + decoded);
  decoded++;
  epsqosbitrates->maxBitRateForDL = *(buffer + decoded);
  decoded++;
  epsqosbitrates->guarBitRateForUL = *(buffer + decoded);
  decoded++;
  epsqosbitrates->guarBitRateForDL = *(buffer + decoded);
  decoded++;
  return decoded;
}

int decode_eps_quality_of_service(EpsQualityOfService *epsqualityofservice, 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);
  epsqualityofservice->qci = *(buffer + decoded);
  decoded++;

  if ( ielen > 2 + (iei > 0) ? 1 : 0 ) {
    /* bitRates is present */
    epsqualityofservice->bitRatesPresent = 1;
    decoded += decode_eps_qos_bit_rates(&epsqualityofservice->bitRates,
                                        buffer + decoded);
  } else {
    /* bitRates is not present */
    epsqualityofservice->bitRatesPresent = 0;
  }

  if ( ielen > 6 + (iei > 0) ? 1 : 0 ) {
    /* bitRatesExt is present */
    epsqualityofservice->bitRatesExtPresent = 1;
    decoded += decode_eps_qos_bit_rates(&epsqualityofservice->bitRatesExt,
                                        buffer + decoded);
  } else {
    /* bitRatesExt is not present */
    epsqualityofservice->bitRatesExtPresent = 0;
  }

#if defined (NAS_DEBUG)
  dump_eps_quality_of_service_xml(epsqualityofservice, iei);
#endif
  return decoded;
}

static int encode_eps_qos_bit_rates(const EpsQoSBitRates* epsqosbitrates, uint8_t *buffer)
{
  int encoded = 0;
  *(buffer + encoded) = epsqosbitrates->maxBitRateForUL;
  encoded ++;
  *(buffer + encoded) = epsqosbitrates->maxBitRateForDL;
  encoded ++;
  *(buffer + encoded) = epsqosbitrates->guarBitRateForUL;
  encoded ++;
  *(buffer + encoded) = epsqosbitrates->guarBitRateForDL;
  encoded ++;
  return encoded;
}

int encode_eps_quality_of_service(EpsQualityOfService *epsqualityofservice, 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, EPS_QUALITY_OF_SERVICE_MINIMUM_LENGTH, len);
#if defined (NAS_DEBUG)
  dump_eps_quality_of_service_xml(epsqualityofservice, iei);
#endif

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

  lenPtr  = (buffer + encoded);
  encoded ++;
  *(buffer + encoded) = epsqualityofservice->qci;
  encoded++;

  if (epsqualityofservice->bitRatesPresent) {
    encoded += encode_eps_qos_bit_rates(&epsqualityofservice->bitRates,
                                        buffer + encoded);
  }

  if (epsqualityofservice->bitRatesExtPresent) {
    encoded += encode_eps_qos_bit_rates(&epsqualityofservice->bitRatesExt,
                                        buffer + encoded);
  }

  *lenPtr = encoded - 1 - ((iei > 0) ? 1 : 0);
  return encoded;
}

void dump_eps_quality_of_service_xml(EpsQualityOfService *epsqualityofservice, uint8_t iei)
{
  printf("<Eps Quality Of Service>\n");

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

  printf("    <QCI>%u</QCI>\n", epsqualityofservice->qci);

  if (epsqualityofservice->bitRatesPresent) {
    printf("    <bitRates>\n");
    printf("        <maxBitRateForUL>%u</maxBitRateForUL>\n",
           epsqualityofservice->bitRates.maxBitRateForUL);
    printf("        <maxBitRateForDL>%u</maxBitRateForDL>\n",
           epsqualityofservice->bitRates.maxBitRateForDL);
    printf("        <guarBitRateForUL>%u</guarBitRateForUL>\n",
           epsqualityofservice->bitRates.guarBitRateForUL);
    printf("        <guarBitRateForDL>%u</guarBitRateForDL>\n",
           epsqualityofservice->bitRates.guarBitRateForDL);
    printf("    </bitRates>\n");
  }

  if (epsqualityofservice->bitRatesExtPresent) {
    printf("    <bitRatesExt>\n");
    printf("        <maxBitRateForUL>%u</maxBitRateForUL>\n",
           epsqualityofservice->bitRatesExt.maxBitRateForUL);
    printf("        <maxBitRateForDL>%u</maxBitRateForDL>\n",
           epsqualityofservice->bitRatesExt.maxBitRateForDL);
    printf("        <guarBitRateForUL>%u</guarBitRateForUL>\n",
           epsqualityofservice->bitRatesExt.guarBitRateForUL);
    printf("        <guarBitRateForDL>%u</guarBitRateForDL>\n",
           epsqualityofservice->bitRatesExt.guarBitRateForDL);
    printf("    </bitRatesExt>\n");
  }

  printf("</Eps Quality Of Service>\n");
}

#define EPS_QOS_BIT_RATE_MAX  262144  // 256 Mbps
int eps_qos_bit_rate_value(uint8_t br)
{
  if (br < 0b00000001) {
    return (EPS_QOS_BIT_RATE_MAX);
  } else if ( (br > 0b00000000) && (br < 0b01000000) ) {
    return (br);
  } else if ( (br > 0b00111111) && (br < 0b10000000) ) {
    return (64 + (br - 0b01000000) * 8);
  } else if ( (br > 0b01111111) && (br < 0b11111111) ) {
    return (576 + (br - 0b10000000) * 64);
  } else {
    return (0);
  }
}

int eps_qos_bit_rate_ext_value(uint8_t br)
{
  if ( (br > 0b00000000) && (br < 0b01001011) ) {
    return (8600 + br * 100);
  } else if ( (br > 0b01001010) && (br < 0b10111011) ) {
    return (16384 + (br - 0b01001010) * 1024);
  } else if ( (br > 0b10111010) && (br < 0b11111011) ) {
    return (131072 + (br - 0b10111010) * 2048);
  } else {
    return (-1);
  }
}