/*******************************************************************************

 Eurecom OpenAirInterface 2
 Copyright(c) 1999 - 2010 Eurecom

 This program is free software; you can redistribute it and/or modify it
 under the terms and conditions of the GNU General Public License,
 version 2, as published by the Free Software Foundation.

 This program is distributed in the hope it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 more details.

 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

 The full GNU General Public License is included in this distribution in
 the file called "COPYING".

 Contact Information
 Openair Admin: openair_admin@eurecom.fr
 Openair Tech : openair_tech@eurecom.fr
 Forums       : http://forums.eurecom.fsr/openairinterface
 Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

 *******************************************************************************/

/*! \file rrc_common.c
 * \brief rrc common procedures for eNB and UE
 * \author Raymond Knopp and Navid Nikaein
 * \date 2011
 * \version 1.0
 * \company Eurecom
 * \email: raymond.knopp@eurecom.fr and  navid.nikaein@eurecom.fr
 */

#include "defs.h"
#include "extern.h"
#include "LAYER2/MAC/extern.h"
#include "COMMON/openair_defs.h"
#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
#include "LAYER2/RLC/rlc.h"
#include "COMMON/mac_rrc_primitives.h"
#include "UTIL/LOG/log.h"
#include "asn1_msg.h"
#include "pdcp.h"

#define DEBUG_RRC 1
extern eNB_MAC_INST *eNB_mac_inst;
extern UE_MAC_INST *UE_mac_inst;

extern mui_t rrc_eNB_mui;

//configure  BCCH & CCCH Logical Channels and associated rrc_buffers, configure associated SRBs
void openair_rrc_on(u8 Mod_id, u8 eNB_flag) {
  unsigned short i;

  if (eNB_flag == 1) {
    LOG_I(RRC, "[eNB %d] OPENAIR RRC IN....\n", Mod_id);

    rrc_config_buffer (&eNB_rrc_inst[Mod_id].SI, BCCH, 1);
    eNB_rrc_inst[Mod_id].SI.Active = 1;
    rrc_config_buffer (&eNB_rrc_inst[Mod_id].Srb0, CCCH, 1);
    eNB_rrc_inst[Mod_id].Srb0.Active = 1;

  }
  else {
    LOG_I(RRC, "[UE %d] OPENAIR RRC IN....\n", Mod_id);
    for (i = 0; i < NB_eNB_INST; i++) {
      LOG_D(RRC, "[RRC][UE %d] Activating CCCH (eNB %d)\n", Mod_id, i);
      UE_rrc_inst[Mod_id].Srb0[i].Srb_id = CCCH;
      memcpy (&UE_rrc_inst[Mod_id].Srb0[i].Lchan_desc[0], &CCCH_LCHAN_DESC, LCHAN_DESC_SIZE);
      memcpy (&UE_rrc_inst[Mod_id].Srb0[i].Lchan_desc[1], &CCCH_LCHAN_DESC, LCHAN_DESC_SIZE);
      rrc_config_buffer (&UE_rrc_inst[Mod_id].Srb0[i], CCCH, 1);
      UE_rrc_inst[Mod_id].Srb0[i].Active = 1;
    }
  }
}

int rrc_init_global_param(void) {

  //#ifdef USER_MODE
  //  Rrc_xface = (RRC_XFACE*)malloc16(sizeof(RRC_XFACE));
  //#endif //USRE_MODE

  //  Rrc_xface->openair_rrc_top_init = openair_rrc_top_init;
  //  Rrc_xface->openair_rrc_eNB_init = openair_rrc_eNB_init;
  //  Rrc_xface->openair_rrc_UE_init  = openair_rrc_ue_init;
  //  Rrc_xface->mac_rrc_data_ind     = mac_rrc_data_ind;
  //Rrc_xface->mac_rrc_data_req     = mac_rrc_data_req;
  // Rrc_xface->rrc_data_indP        = (void *)rlcrrc_data_ind;
  //  Rrc_xface->rrc_rx_tx            = rrc_rx_tx;
  //  Rrc_xface->mac_rrc_meas_ind     = mac_rrc_meas_ind;
  //  Rrc_xface->get_rrc_status       = get_rrc_status;

  //Rrc_xface->rrc_get_status = ...

  //  Mac_rlc_xface->mac_out_of_sync_ind=mac_out_of_sync_ind;

#ifndef NO_RRM
  //  Rrc_xface->fn_rrc=fn_rrc;
#endif
  //  LOG_D(RRC, "[RRC]INIT_GLOBAL_PARAM: Mac_rlc_xface %p, rrc_rlc_register %p,rlcrrc_data_ind%p\n",Mac_rlc_xface,Mac_rlc_xface->rrc_rlc_register_rrc,rlcrrc_data_ind);
  /*
   if((Mac_rlc_xface==NULL) || (Mac_rlc_xface->rrc_rlc_register_rrc==NULL) ||
   (rlcrrc_data_ind==NULL)) {
   LOG_E(RRC,"Data structured is not initialized \n");
   return -1;
   }
   */
  rrc_rlc_register_rrc (rlcrrc_data_ind, NULL); //register with rlc

  DCCH_LCHAN_DESC.transport_block_size = 4;
  DCCH_LCHAN_DESC.max_transport_blocks = 16;
  DCCH_LCHAN_DESC.Delay_class = 1;
  DTCH_DL_LCHAN_DESC.transport_block_size = 52;
  DTCH_DL_LCHAN_DESC.max_transport_blocks = 20;
  DTCH_DL_LCHAN_DESC.Delay_class = 1;
  DTCH_UL_LCHAN_DESC.transport_block_size = 52;
  DTCH_UL_LCHAN_DESC.max_transport_blocks = 20;
  DTCH_UL_LCHAN_DESC.Delay_class = 1;

  Rlc_info_um.rlc_mode = RLC_UM;
  Rlc_info_um.rlc.rlc_um_info.timer_reordering = 5;
  Rlc_info_um.rlc.rlc_um_info.sn_field_length = 10;
  Rlc_info_um.rlc.rlc_um_info.is_mXch = 0;
  //Rlc_info_um.rlc.rlc_um_info.sdu_discard_mode=16;

  Rlc_info_am_config.rlc_mode = RLC_AM;
  Rlc_info_am_config.rlc.rlc_am_info.max_retx_threshold = 50;
  Rlc_info_am_config.rlc.rlc_am_info.poll_pdu = 8;
  Rlc_info_am_config.rlc.rlc_am_info.poll_byte = 1000;
  Rlc_info_am_config.rlc.rlc_am_info.t_poll_retransmit = 15;
  Rlc_info_am_config.rlc.rlc_am_info.t_reordering = 50;
  Rlc_info_am_config.rlc.rlc_am_info.t_status_prohibit = 10;
#ifndef NO_RRM
  if (L3_xface_init ())
    return (-1);
#endif

  return 0;
}

#ifndef NO_RRM
/*------------------------------------------------------------------------------*/
int L3_xface_init(void) {
  /*------------------------------------------------------------------------------*/

  int ret = 0;

#ifdef USER_MODE

  int sock;
  LOG_D(RRC, "[L3_XFACE] init de l'interface \n");

  if (open_socket (&S_rrc, RRC_RRM_SOCK_PATH, RRM_RRC_SOCK_PATH, 0) == -1)
    return (-1);

  if (S_rrc.s == -1) {
    return (-1);
  }

  socket_setnonblocking (S_rrc.s);
  msg ("Interface Connected... RRM-RRC\n");
  return 0;

#else

  ret=rtf_create(RRC2RRM_FIFO,32768);

  if (ret < 0) {
    msg("[openair][MAC][INIT] Cannot create RRC2RRM fifo %d (ERROR %d)\n",RRC2RRM_FIFO,ret);

    return(-1);
  }
  else {
    msg("[openair][MAC][INIT] Created RRC2RRM fifo %d\n",RRC2RRM_FIFO);
    rtf_reset(RRC2RRM_FIFO);
  }

  ret=rtf_create(RRM2RRC_FIFO,32768);

  if (ret < 0) {
    msg("[openair][MAC][INIT] Cannot create RRM2RRC fifo %d (ERROR %d)\n",RRM2RRC_FIFO,ret);

    return(-1);
  }
  else {
    msg("[openair][MAC][INIT] Created RRC2RRM fifo %d\n",RRM2RRC_FIFO);
    rtf_reset(RRM2RRC_FIFO);
  }

  return(0);

#endif
}
#endif

void rrc_config_buffer(SRB_INFO *Srb_info, u8 Lchan_type, u8 Role) {

  Srb_info->Rx_buffer.payload_size = 0;
  Srb_info->Tx_buffer.payload_size = 0;
}

/*------------------------------------------------------------------------------*/
void openair_rrc_top_init(int eMBMS_active, u8 cba_group_active,u8 HO_active){
  /*-----------------------------------------------------------------------------*/

  int i;
  OAI_UECapability_t *UECap;
  //  uint8_t dummy_buffer[100];

  LOG_D(RRC, "[OPENAIR][INIT] Init function start: NB_UE_INST=%d, NB_eNB_INST=%d\n", NB_UE_INST, NB_eNB_INST);

  if (NB_UE_INST > 0) {
    UE_rrc_inst = (UE_RRC_INST*) malloc16(NB_UE_INST*sizeof(UE_RRC_INST));
    memset (UE_rrc_inst, 0, NB_UE_INST * sizeof(UE_RRC_INST));
    LOG_D(RRC, "ALLOCATE %d Bytes for UE_RRC_INST @ %p\n", (unsigned int)(NB_UE_INST*sizeof(UE_RRC_INST)), UE_rrc_inst);

    // fill UE capability
    UECap = fill_ue_capability ();
    for (i = 0; i < NB_UE_INST; i++) {
      UE_rrc_inst[i].UECapability = UECap->sdu;
      UE_rrc_inst[i].UECapability_size = UECap->sdu_size;
    }
    /*
     do_UECapabilityEnquiry(0,
     dummy_buffer,
     0,
     0);*/
#ifdef Rel10
    LOG_I(RRC,"[UE] eMBMS active state is %d \n", eMBMS_active);
    for (i=0;i<NB_eNB_INST;i++) {
      UE_rrc_inst[i].MBMS_flag = (uint8_t)eMBMS_active;
    }
#endif 
  }
  else
    UE_rrc_inst = NULL;

  if (NB_eNB_INST > 0) {
    eNB_rrc_inst = (eNB_RRC_INST*) malloc16(NB_eNB_INST*sizeof(eNB_RRC_INST));
    memset (eNB_rrc_inst, 0, NB_eNB_INST * sizeof(eNB_RRC_INST));
    LOG_I(RRC,"[eNB] handover active state is %d \n", HO_active);
    for (i=0;i<NB_eNB_INST;i++) {
      eNB_rrc_inst[i].HO_flag   = (uint8_t)HO_active;
    }
#ifdef Rel10
    LOG_I(RRC,"[eNB] eMBMS active state is %d \n", eMBMS_active);
    for (i=0;i<NB_eNB_INST;i++) {
      eNB_rrc_inst[i].MBMS_flag = (uint8_t)eMBMS_active;
    }
#endif 
#ifdef CBA
    for (i=0;i<NB_eNB_INST;i++) {
      eNB_rrc_inst[i].num_active_cba_groups = cba_group_active;
    }
#endif
    LOG_D(RRC,
          "ALLOCATE %d Bytes for eNB_RRC_INST @ %p\n", (unsigned int)(NB_eNB_INST*sizeof(eNB_RRC_INST)), eNB_rrc_inst);
  }
  else
    eNB_rrc_inst = NULL;
#ifndef NO_RRM
#ifndef USER_MODE

  Header_buf=(char*)malloc16(sizeof(msg_head_t));
  Data=(char*)malloc16(2400);
  Header_read_idx=0;
  Data_read_idx=0;
  Header_size=sizeof(msg_head_t);

#endif //NO_RRM
  Data_to_read = 0;
#endif //USER_MODE
}

void rrc_top_cleanup(void) {

  if (NB_UE_INST > 0)
    free (UE_rrc_inst);
  if (NB_eNB_INST > 0)
    free (eNB_rrc_inst);

}


void rrc_t310_expiration(u32 frame, u8 Mod_id, u8 eNB_index) {

  if (UE_rrc_inst[Mod_id].Info[eNB_index].State != RRC_CONNECTED) {
    LOG_D(RRC, "Timer 310 expired, going to RRC_IDLE\n");
    UE_rrc_inst[Mod_id].Info[eNB_index].State = RRC_IDLE;
    UE_rrc_inst[Mod_id].Info[eNB_index].UE_index = 0xffff;

    UE_rrc_inst[Mod_id].Srb0[eNB_index].Rx_buffer.payload_size = 0;
    UE_rrc_inst[Mod_id].Srb0[eNB_index].Tx_buffer.payload_size = 0;

    UE_rrc_inst[Mod_id].Srb1[eNB_index].Srb_info.Rx_buffer.payload_size = 0;
    UE_rrc_inst[Mod_id].Srb1[eNB_index].Srb_info.Tx_buffer.payload_size = 0;

    if (UE_rrc_inst[Mod_id].Srb2[eNB_index].Active == 1) {
      msg ("[RRC Inst %d] eNB_index %d, Remove RB %d\n ", Mod_id, eNB_index,
           UE_rrc_inst[Mod_id].Srb2[eNB_index].Srb_info.Srb_id);
      rrc_pdcp_config_req (Mod_id + NB_eNB_INST, frame, 0, ACTION_REMOVE,
                           UE_rrc_inst[Mod_id].Srb2[eNB_index].Srb_info.Srb_id, 0);
      rrc_rlc_config_req (Mod_id + NB_eNB_INST, frame, 0, ACTION_REMOVE,
                          UE_rrc_inst[Mod_id].Srb2[eNB_index].Srb_info.Srb_id, SIGNALLING_RADIO_BEARER, Rlc_info_um);
      UE_rrc_inst[Mod_id].Srb2[eNB_index].Active = 0;
      UE_rrc_inst[Mod_id].Srb2[eNB_index].Status = IDLE;
      UE_rrc_inst[Mod_id].Srb2[eNB_index].Next_check_frame = 0;
    }
  }
  else { // Restablishment procedure
    LOG_D(RRC, "Timer 310 expired, trying RRCRestablishment ...\n");
  }
}

RRC_status_t rrc_rx_tx(u8 Mod_id,u32 frame, u8 eNB_flag,u8 index){
  
  if(eNB_flag == 0) {
    // check timers

    if (UE_rrc_inst[Mod_id].Info[index].T300_active == 1) {
      if ((UE_rrc_inst[Mod_id].Info[index].T300_cnt % 10) == 0)
        LOG_D(RRC,
              "[UE %d][RAPROC] Frame %d T300 Count %d ms\n", Mod_id, frame, UE_rrc_inst[Mod_id].Info[index].T300_cnt);
      if (UE_rrc_inst[Mod_id].Info[index].T300_cnt
          == T300[UE_rrc_inst[Mod_id].sib2[index]->ue_TimersAndConstants.t300]) {
        UE_rrc_inst[Mod_id].Info[index].T300_active = 0;
        // ALLOW CCCH to be used
        UE_rrc_inst[Mod_id].Srb0[index].Tx_buffer.payload_size = 0;
        rrc_ue_generate_RRCConnectionRequest (Mod_id, frame, index);
        return (RRC_ConnSetup_failed);
      }
      UE_rrc_inst[Mod_id].Info[index].T300_cnt++;
    }
    if (UE_rrc_inst[Mod_id].sib2[index]) {
      if (UE_rrc_inst[Mod_id].Info[index].N310_cnt
          == N310[UE_rrc_inst[Mod_id].sib2[index]->ue_TimersAndConstants.n310]) {
        UE_rrc_inst[Mod_id].Info[index].T310_active = 1;
      }
    }
    else { // in case we have not received SIB2 yet
      if (UE_rrc_inst[Mod_id].Info[index].N310_cnt == 100) {
        UE_rrc_inst[Mod_id].Info[index].N310_cnt = 0;
        return RRC_PHY_RESYNCH;
      }
    }
    if (UE_rrc_inst[Mod_id].Info[index].T310_active == 1) {
      if (UE_rrc_inst[Mod_id].Info[index].N311_cnt
          == N311[UE_rrc_inst[Mod_id].sib2[index]->ue_TimersAndConstants.n311]) {
        UE_rrc_inst[Mod_id].Info[index].T310_active = 0;
        UE_rrc_inst[Mod_id].Info[index].N311_cnt = 0;
      }
      if ((UE_rrc_inst[Mod_id].Info[index].T310_cnt % 10) == 0)
        LOG_D(RRC, "[UE %d] Frame %d T310 Count %d ms\n", Mod_id, frame, UE_rrc_inst[Mod_id].Info[index].T310_cnt);
      if (UE_rrc_inst[Mod_id].Info[index].T310_cnt
          == T310[UE_rrc_inst[Mod_id].sib2[index]->ue_TimersAndConstants.t310]) {
        UE_rrc_inst[Mod_id].Info[index].T310_active = 0;
        rrc_t310_expiration (frame, Mod_id, index);
        return (RRC_PHY_RESYNCH);
      }
      UE_rrc_inst[Mod_id].Info[index].T310_cnt++;
    }
    
    
    if (UE_rrc_inst[Mod_id].Info[index].T304_active==1) {
      if ((UE_rrc_inst[Mod_id].Info[index].T304_cnt % 10) == 0)
	LOG_D(RRC,"[UE %d][RAPROC] Frame %d T304 Count %d ms\n",Mod_id,frame,
	      UE_rrc_inst[Mod_id].Info[index].T304_cnt);
      if (UE_rrc_inst[Mod_id].Info[index].T304_cnt == 0) {
	UE_rrc_inst[Mod_id].Info[index].T304_active = 0;
	UE_rrc_inst[Mod_id].HandoverInfoUe.measFlag = 1;
	LOG_E(RRC,"[UE %d] Handover failure..initiating connection re-establishment procedure... \n");
	//Implement 36.331, section 5.3.5.6 here
	return(RRC_Handover_failed);
      }
      UE_rrc_inst[Mod_id].Info[index].T304_cnt--;
    }
    // Layer 3 filtering of RRC measurements
    if (UE_rrc_inst[Mod_id].QuantityConfig[0] != NULL) {
      ue_meas_filtering(Mod_id,frame,index);
    }
    ue_measurement_report_triggering(Mod_id,frame,index);
    if (UE_rrc_inst[Mod_id].Info[0].handoverTarget > 0)       
      LOG_I(RRC,"[UE %d] Frame %d : RRC handover initiated\n", Mod_id, frame);
    if((UE_rrc_inst[Mod_id].Info[index].State == RRC_HO_EXECUTION)   && 
       (UE_rrc_inst[Mod_id].HandoverInfoUe.targetCellId != 0xFF)) {
      UE_rrc_inst[Mod_id].Info[index].State= RRC_IDLE;
      return(RRC_HO_STARTED);
    }

  }
  else {
    check_handovers(Mod_id,frame);
  }
  
  return (RRC_OK);
}

long binary_search_int(int elements[], long numElem, int value) {
  long first, last, middle, search = -1;
  first = 0;
  last = numElem-1;
  middle = (first+last)/2;
  if(value < elements[0])
    return first;
  if(value > elements[last])
    return last;
  
  while (first <= last) {
    if (elements[middle] < value)
      first = middle+1;
    else if (elements[middle] == value) {
      search = middle+1;
      break;
    }
    else
      last = middle -1;
    
    middle = (first+last)/2;
  }
  if (first > last)
    LOG_E(RRC,"Error in binary search!");
  return search;
}

/* This is a binary search routine which operates on an array of floating
   point numbers and returns the index of the range the value lies in
   Used for RSRP and RSRQ measurement mapping. Can potentially be used for other things
*/
long binary_search_float(float elements[], long numElem, float value) {
  long first, last, middle;
  first = 0;
  last = numElem-1;
  middle = (first+last)/2;
  if(value <= elements[0])
    return first;
  if(value >= elements[last])
    return last;
  
  while (last - first > 1) {
    if (elements[middle] > value)
      last = middle;
    else
      first = middle;
    
    middle = (first+last)/2;
  }
  if (first < 0 || first >= numElem)
    LOG_E(RRC,"\n Error in binary search float!");
  return first;
}

