/* 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 RRC/NR/nr_rrc_defs.h
* \brief NR RRC struct definitions and function prototypes
* \author Navid Nikaein, Raymond Knopp, WEI-TAI CHEN
* \date 2010 - 2014, 2018
* \version 1.0
* \company Eurecom, NTSUT
* \email: navid.nikaein@eurecom.fr, raymond.knopp@eurecom.fr, kroempa@gmail.com
*/

#ifndef __OPENAIR_RRC_DEFS_NR_H__
#define __OPENAIR_RRC_DEFS_NR_H__


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "collection/tree.h"
#include "collection/linear_alloc.h"
#include "common/utils/ds/seq_arr.h"
#include "nr_rrc_common.h"
#include "ds/byte_array.h"
#include "common/platform_constants.h"
#include "common/platform_types.h"
#include "mac_rrc_dl.h"
#include "cucp_cuup_if.h"
#include "NR_BCCH-BCH-Message.h"
#include "NR_BCCH-DL-SCH-Message.h"
#include "NR_CellGroupConfig.h"
#include "NR_MeasurementReport.h"
#include "NR_MeasurementTimingConfiguration.h"
#include "NR_RRCReconfiguration.h"
#include "NR_UE-CapabilityRAT-ContainerList.h"
#include "NR_UL-CCCH-Message.h"
#include "NR_UE-MRDC-Capability.h"
#include "NR_UE-NR-Capability.h"
#include "intertask_interface.h"
#include "openair2/LAYER2/nr_pdcp/nr_pdcp_configuration.h"
#include "openair2/LAYER2/nr_rlc/nr_rlc_configuration.h"
#include "openair2/SDAP/nr_sdap/nr_sdap_configuration.h"

typedef enum {
  NR_RRC_OK=0,
  NR_RRC_ConnSetup_failed,
  NR_RRC_PHY_RESYNCH,
  NR_RRC_Handover_failed,
  NR_RRC_HO_STARTED
} NR_RRC_status_t;

#define MAX_MEAS_OBJ                                  7
#define MAX_MEAS_CONFIG                               7
#define MAX_MEAS_ID                                   7

#define UNDEF_SECURITY_MODE                           0xff
#define NO_SECURITY_MODE                              0x20

/* TS 36.331: RRC-TransactionIdentifier ::= INTEGER (0..3) */
#define NR_RRC_TRANSACTION_IDENTIFIER_NUMBER 4

typedef struct UE_S_TMSI_NR_s {
  bool                                                presence;
  uint16_t                                            amf_set_id;
  uint8_t                                             amf_pointer;
  uint32_t                                            fiveg_tmsi;
} __attribute__ ((__packed__)) NR_UE_S_TMSI;

typedef struct nr_e_rab_param_s {
  e_rab_t param;
  uint8_t status;
  uint8_t xid; // transaction_id
} __attribute__ ((__packed__)) nr_e_rab_param_t;

typedef enum pdu_session_satus_e {
  PDU_SESSION_STATUS_NEW,
  PDU_SESSION_STATUS_DONE,
  PDU_SESSION_STATUS_ESTABLISHED,
  PDU_SESSION_STATUS_REESTABLISHED, // after HO
  PDU_SESSION_STATUS_TOMODIFY, // ENDC NSA
  PDU_SESSION_STATUS_FAILED,
  PDU_SESSION_STATUS_TORELEASE, // to release DRB between eNB and UE
  PDU_SESSION_STATUS_RELEASED
} pdu_session_status_t;

typedef struct pdusession_s {
  /* Unique pdusession_id for the UE. */
  int pdusession_id;
  byte_array_t nas_pdu;
  /* Quality of service for this pdusession */
  seq_arr_t qos;
  /* The transport layer address for the IP packets */
  pdu_session_type_t pdu_session_type;
  // NG-RAN endpoint of the NG-U (N3) transport bearer
  gtpu_tunnel_t n3_outgoing;
  // UPF endpoint of the NG-U (N3) transport bearer
  gtpu_tunnel_t n3_incoming;
  nssai_t nssai;
  // PDU Session specific SDAP configuration
  nr_sdap_configuration_t sdap_config;
} pdusession_t;

typedef struct pdu_session_param_s {
  pdusession_t param;
  pdu_session_status_t status;
  uint8_t xid; // transaction_id
  ngap_cause_t cause;
} rrc_pdu_session_param_t;

typedef struct drb_s {
  int status;
  int drb_id;
  int pdusession_id;
  // F1-U Downlink Tunnel Config (on DU side)
  gtpu_tunnel_t du_tunnel_config;
  // F1-U Uplink Tunnel Config (on CU-UP side)
  gtpu_tunnel_t cuup_tunnel_config;
  // DRB-specific PDCP configuration
  nr_pdcp_configuration_t pdcp_config;
} drb_t;

typedef enum {
  RRC_ACTION_NONE, /* no transaction ongoing */
  RRC_SETUP,
  RRC_SETUP_FOR_REESTABLISHMENT,
  RRC_REESTABLISH,
  RRC_REESTABLISH_COMPLETE,
  RRC_DEDICATED_RECONF,
  RRC_PDUSESSION_ESTABLISH,
  RRC_PDUSESSION_MODIFY,
  RRC_PDUSESSION_RELEASE,
  RRC_UECAPABILITY_ENQUIRY,
} rrc_action_t;

typedef struct nr_redcap_ue_cap {
  bool support_of_redcap_r17;
  bool support_of_16drb_redcap_r17;
  bool pdcp_drb_long_sn_redcap_r17;
  bool rlc_am_drb_long_sn_redcap_r17;
} nr_redcap_ue_cap_t;

typedef struct {
  int drb_id;
  pdusession_level_qos_parameter_t qos;
} nr_rrc_qos_t;

/* forward declaration */
typedef struct nr_handover_context_s nr_handover_context_t;

typedef struct gNB_RRC_UE_s {
  time_t last_seen; // last time this UE has been accessed

  NR_DRB_ToReleaseList_t            *DRB_ReleaseList;

  NR_SRB_INFO_TABLE_ENTRY Srb[NR_NUM_SRB];
  NR_MeasConfig_t                   *measConfig;
  nr_handover_context_t *ho_context;
  NR_MeasResults_t                  *measResults;

  bool as_security_active;
  bool f1_ue_context_active;

  byte_array_t ue_cap_buffer;
  NR_UE_NR_Capability_t*             UE_Capability_nr;
  int                                UE_Capability_size;
  NR_UE_MRDC_Capability_t*           UE_Capability_MRDC;
  int                                UE_MRDC_Capability_size;

  NR_CellGroupConfig_t               *masterCellGroup;
  NR_RadioBearerConfig_t             *rb_config;

  /* KgNB as derived from KASME received from EPC */
  uint8_t kgnb[32];
  uint8_t nh[32];
  int8_t  nh_ncc;

  /* Used integrity/ciphering algorithms */
  NR_CipheringAlgorithm_t            ciphering_algorithm;
  e_NR_IntegrityProtAlgorithm        integrity_algorithm;

  rnti_t                             rnti;
  uint64_t                           random_ue_identity;

  /* Information from UE RRC Setup Request */
  NR_UE_S_TMSI                       Initialue_identity_5g_s_TMSI;
  uint64_t                           ng_5G_S_TMSI_Part1;
  NR_EstablishmentCause_t            establishment_cause;

  uint64_t nr_cellid;
  uint32_t                           rrc_ue_id;
  uint64_t amf_ue_ngap_id;
  // Globally Unique AMF Identifier
  nr_guami_t ue_guami;
  // Serving PLMN of the UE
  plmn_id_t serving_plmn;

  ngap_security_capabilities_t       security_capabilities;
  //NSA block
  sctp_assoc_t x2_target_assoc;
  int MeNB_ue_x2_id;
  int                                nb_of_e_rabs;
  nr_e_rab_param_t                   e_rab[NB_RB_MAX];//[S1AP_MAX_E_RAB];
  uint32_t                           nsa_gtp_teid[S1AP_MAX_E_RAB];
  transport_layer_addr_t             nsa_gtp_addrs[S1AP_MAX_E_RAB];
  rb_id_t                            nsa_gtp_ebi[S1AP_MAX_E_RAB];
  rb_id_t                            nsa_gtp_psi[S1AP_MAX_E_RAB];

  //SA block
  seq_arr_t pduSessions;
  // Established DRBs
  seq_arr_t drbs;

  rrc_action_t xids[NR_RRC_TRANSACTION_IDENTIFIER_NUMBER];
  uint8_t e_rab_release_command_flag;
  uint32_t ue_rrc_inactivity_timer;
  uint32_t                           ue_reestablishment_counter;
  uint32_t                           ue_reconfiguration_counter;
  bool ongoing_reconfiguration;
  bool an_release; // flag if core requested UE release

  /* NGUEContextSetup might come with PDU sessions, but setup needs to be
   * delayed after security (and capability); PDU sessions are stored here */
  int n_initial_pdu;
  pdusession_t *initial_pdus;

  /* Nas Pdu */
  byte_array_t nas_pdu;

  /* hack, see rrc_gNB_process_NGAP_PDUSESSION_SETUP_REQ() for more info */
  int max_delays_pdu_session;
  bool ongoing_pdusession_setup_request;

  nr_redcap_ue_cap_t *redcap_cap;
} gNB_RRC_UE_t;

typedef struct rrc_gNB_ue_context_s {
  /* Tree related data */
  RB_ENTRY(rrc_gNB_ue_context_s) entries;
  /* UE id for initial connection to NGAP */
  struct gNB_RRC_UE_s   ue_context;
} rrc_gNB_ue_context_t;

typedef struct {
  /* nea0 = 0, nea1 = 1, ... */
  int ciphering_algorithms[4];
  int ciphering_algorithms_count;

  /* nia0 = 0, nia1 = 1, ... */
  int integrity_algorithms[4];
  int integrity_algorithms_count;

  /* flags to enable/disable ciphering and integrity for DRBs */
  int do_drb_ciphering;
  int do_drb_integrity;
} nr_security_configuration_t;

typedef struct {
  long maxReportCells;
  bool includeBeamMeasurements;
} nr_per_event_t;

typedef struct {
  long threshold_RSRP;
  long timeToTrigger;
} nr_a2_event_t;

typedef struct {
  int pci;
  long a3_offset;
  long hysteresis;
  long timeToTrigger;
} nr_a3_event_t;

typedef struct {
  nr_per_event_t *per_event;
  nr_a2_event_t *a2_event;
  seq_arr_t *a3_event_list;
  bool is_default_a3_configuration_exists;
} nr_measurement_configuration_t;

typedef struct {
  uint32_t gNB_ID;
  uint64_t nrcell_id;
  int physicalCellId;
  int absoluteFrequencySSB;
  int subcarrierSpacing;
  int band;
  plmn_id_t plmn;
  uint32_t tac;
  bool isIntraFrequencyNeighbour;
} nr_neighbour_cell_t;

typedef struct neighbour_cell_configuration_s {
  uint64_t nr_cell_id;
  seq_arr_t *neighbour_cells;
} neighbour_cell_configuration_t;

typedef struct nr_mac_rrc_dl_if_s {
  f1_reset_cu_initiated_func_t f1_reset;
  f1_reset_acknowledge_du_initiated_func_t f1_reset_acknowledge;
  f1_setup_response_func_t f1_setup_response;
  f1_setup_failure_func_t f1_setup_failure;
  gnb_du_configuration_update_ack_func_t gnb_du_configuration_update_acknowledge;
  ue_context_setup_request_func_t ue_context_setup_request;
  ue_context_modification_request_func_t ue_context_modification_request;
  ue_context_modification_confirm_func_t ue_context_modification_confirm;
  ue_context_modification_refuse_func_t ue_context_modification_refuse;
  ue_context_release_command_func_t ue_context_release_command;
  dl_rrc_message_transfer_func_t dl_rrc_message_transfer;
} nr_mac_rrc_dl_if_t;

typedef struct cucp_cuup_if_s {
  cucp_cuup_bearer_context_setup_func_t bearer_context_setup;
  cucp_cuup_bearer_context_mod_func_t bearer_context_mod;
  cucp_cuup_bearer_context_release_func_t bearer_context_release;
} cucp_cuup_if_t;

typedef struct nr_rrc_du_container_t {
  /* Tree-related data */
  RB_ENTRY(nr_rrc_du_container_t) entries;

  sctp_assoc_t assoc_id;
  f1ap_setup_req_t *setup_req;
  NR_MIB_t *mib;
  NR_SIB1_t *sib1;
  NR_MeasurementTimingConfiguration_t *mtc;
} nr_rrc_du_container_t;

typedef struct nr_rrc_cuup_container_t {
  /* Tree-related data */
  RB_ENTRY(nr_rrc_cuup_container_t) entries;

  e1ap_setup_req_t *setup_req;
  sctp_assoc_t assoc_id;
} nr_rrc_cuup_container_t;

//---NR---(completely change)---------------------
typedef struct gNB_RRC_INST_s {

  ngran_node_t                                        node_type;
  uint32_t                                            node_id;
  char                                               *node_name;
  int                                                 module_id;
  eth_params_t                                        eth_params_s;
  uid_allocator_t                                     uid_allocator;
  RB_HEAD(rrc_nr_ue_tree_s, rrc_gNB_ue_context_s) rrc_ue_head; // ue_context tree key search by rnti
  /// NR cell id
  uint64_t nr_cellid;

  // RRC configuration
  gNB_RrcConfigurationReq configuration;
  seq_arr_t *SIBs;

  // gNB N3 GTPU instance
  instance_t e1_inst;

  char *uecap_file;

  // security configuration (preferred algorithms)
  nr_security_configuration_t security;

  nr_mac_rrc_dl_if_t mac_rrc;
  cucp_cuup_if_t cucp_cuup;
  seq_arr_t *neighbour_cell_configuration;
  nr_measurement_configuration_t measurementConfiguration;

  RB_HEAD(rrc_du_tree, nr_rrc_du_container_t) dus; // DUs, indexed by assoc_id
  size_t num_dus;

  RB_HEAD(rrc_cuup_tree, nr_rrc_cuup_container_t) cuups; // CU-UPs, indexed by assoc_id
  size_t num_cuups;

  // PDCP configuration parameters loaded during startup
  nr_pdcp_configuration_t pdcp_config;
  nr_rlc_configuration_t rlc_config;
} gNB_RRC_INST;

#define UE_LOG_FMT "(cellID %lx, UE ID %d RNTI %04x)"
#define UE_LOG_ARGS(ue_context) (ue_context)->nr_cellid, (ue_context)->rrc_ue_id, (ue_context)->rnti

#define LOG_UE_DL_EVENT(ue_context, fmt, ...) LOG_A(NR_RRC, "[DL] " UE_LOG_FMT " " fmt, UE_LOG_ARGS(ue_context) __VA_OPT__(,) __VA_ARGS__)
#define LOG_UE_EVENT(ue_context, fmt, ...)    LOG_A(NR_RRC, "[--] " UE_LOG_FMT " " fmt, UE_LOG_ARGS(ue_context) __VA_OPT__(,) __VA_ARGS__)
#define LOG_UE_UL_EVENT(ue_context, fmt, ...) LOG_A(NR_RRC, "[UL] " UE_LOG_FMT " " fmt, UE_LOG_ARGS(ue_context) __VA_OPT__(,) __VA_ARGS__)

#include "nr_rrc_proto.h" //should be put here otherwise compilation error

#endif
