/*
 * 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 mac_defs.h
 * \brief MAC data structures and constants
 * \author R. Knopp, K.H. HSU
 * \date 2018
 * \version 0.1
 * \company Eurecom / NTUST
 * \email: knopp@eurecom.fr, kai-hsiang.hsu@eurecom.fr
 * \note
 * \warning
 */

#ifndef __LAYER2_NR_MAC_DEFS_H__
#define __LAYER2_NR_MAC_DEFS_H__

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "platform_types.h"

/* IF */
#include "NR_IF_Module.h"
#include "fapi_nr_ue_interface.h"

/* MAC */
#include "LAYER2/NR_MAC_COMMON/nr_mac.h"
#include "LAYER2/NR_MAC_COMMON/nr_mac_common.h"
#include "LAYER2/MAC/mac.h"
#include "NR_MAC_COMMON/nr_mac_extern.h"

/* RRC */
#include "NR_DRX-Config.h"
#include "NR_SchedulingRequestConfig.h"
#include "NR_BSR-Config.h"
#include "NR_TAG-Config.h"
#include "NR_PHR-Config.h"
#include "NR_RNTI-Value.h"
#include "NR_MIB.h"
#include "NR_MAC-CellGroupConfig.h"
#include "NR_PhysicalCellGroupConfig.h"
#include "NR_CellGroupConfig.h"
#include "NR_ServingCellConfig.h"
#include "NR_MeasConfig.h"
#include "NR_ServingCellConfigCommonSIB.h"


// ==========
// NR UE defs
// ==========

#define NB_NR_UE_MAC_INST 1
#define MAX_NUM_BWP_UE       4
#define NUM_SLOT_FRAME    10

/*!\brief value for indicating BSR Timer is not running */
#define NR_MAC_UE_BSR_TIMER_NOT_RUNNING   (0xFFFF)

// ================================================
// SSB to RO mapping private defines and structures
// ================================================

#define MAX_NB_PRACH_CONF_PERIOD_IN_ASSOCIATION_PERIOD (16) // Maximum association period is 16
#define MAX_NB_PRACH_CONF_PERIOD_IN_ASSOCIATION_PATTERN_PERIOD (16) // Max association pattern period is 160ms and minimum PRACH configuration period is 10ms
#define MAX_NB_ASSOCIATION_PERIOD_IN_ASSOCIATION_PATTERN_PERIOD (16) // Max nb of association periods in an association pattern period of 160ms
#define MAX_NB_FRAME_IN_PRACH_CONF_PERIOD (16) // Max PRACH configuration period is 160ms and frame is 10ms
#define MAX_NB_SLOT_IN_FRAME (160) // Max number of slots in a frame (@ SCS 240kHz = 160)
#define MAX_NB_FRAME_IN_ASSOCIATION_PATTERN_PERIOD (16) // Maximum number of frames in the maximum association pattern period
#define MAX_NB_SSB (64) // Maximum number of possible SSB indexes
#define MAX_RO_PER_SSB (8) // Maximum number of consecutive ROs that can be mapped to an SSB according to the ssb_per_RACH config

// Maximum number of ROs that can be mapped to an SSB in an association pattern
// This is to reserve enough elements in the SSBs list for each mapped ROs for a single SSB
// An arbitrary maximum number is chosen to be safe: maximum number of slots in an association pattern * maximum number of ROs in a slot
#define MAX_NB_RO_PER_SSB_IN_ASSOCIATION_PATTERN (MAX_TDM*MAX_FDM*MAX_NB_SLOT_IN_FRAME*MAX_NB_FRAME_IN_ASSOCIATION_PATTERN_PERIOD)

// ===============
// DCI fields defs
// ===============

#define NBR_NR_FORMATS                   8     // The number of formats is 8 (0_0, 0_1, 1_0, 1_1, 2_0, 2_1, 2_2, 2_3)
#define NBR_NR_DCI_FIELDS               56    // The number of different dci fields defined in TS 38.212 subclause 7.3.1

#define IDENTIFIER_DCI_FORMATS           0
#define CARRIER_IND                      1
#define SUL_IND_0_1                      2
#define SLOT_FORMAT_IND                  3
#define PRE_EMPTION_IND                  4
#define BLOCK_NUMBER                     5
#define CLOSE_LOOP_IND                   6
#define BANDWIDTH_PART_IND               7
#define SHORT_MESSAGE_IND                8
#define SHORT_MESSAGES                   9
#define FREQ_DOM_RESOURCE_ASSIGNMENT_UL 10
#define FREQ_DOM_RESOURCE_ASSIGNMENT_DL 11
#define TIME_DOM_RESOURCE_ASSIGNMENT    12
#define VRB_TO_PRB_MAPPING              13
#define PRB_BUNDLING_SIZE_IND           14
#define RATE_MATCHING_IND               15
#define ZP_CSI_RS_TRIGGER               16
#define FREQ_HOPPING_FLAG               17
#define TB1_MCS                         18
#define TB1_NDI                         19
#define TB1_RV                          20
#define TB2_MCS                         21
#define TB2_NDI                         22
#define TB2_RV                          23
#define MCS                             24
#define NDI                             25
#define RV                              26
#define HARQ_PROCESS_NUMBER             27
#define DAI_                            28
#define FIRST_DAI                       29
#define SECOND_DAI                      30
#define TB_SCALING                      31
#define TPC_PUSCH                       32
#define TPC_PUCCH                       33
#define PUCCH_RESOURCE_IND              34
#define PDSCH_TO_HARQ_FEEDBACK_TIME_IND 35
#define SRS_RESOURCE_IND                36
#define PRECOD_NBR_LAYERS               37
#define ANTENNA_PORTS                   38
#define TCI                             39
#define SRS_REQUEST                     40
#define TPC_CMD                         41
#define CSI_REQUEST                     42
#define CBGTI                           43
#define CBGFI                           44
#define PTRS_DMRS                       45
#define BETA_OFFSET_IND                 46
#define DMRS_SEQ_INI                    47
#define UL_SCH_IND                      48
#define PADDING_NR_DCI                  49
#define SUL_IND_0_0                     50
#define RA_PREAMBLE_INDEX               51
#define SUL_IND_1_0                     52
#define SS_PBCH_INDEX                   53
#define PRACH_MASK_INDEX                54
#define RESERVED_NR_DCI                 55

/*!\brief UE layer 2 status */
typedef enum {
  UE_NOT_SYNC = 0,
  UE_SYNC,
  UE_PERFORMING_RA,
  UE_WAIT_TX_ACK_MSG4,
  UE_CONNECTED
} NR_UE_L2_STATE_t;

typedef enum {
  RA_2STEP = 0,
  RA_4STEP
} nr_ra_type_e;

// LTE structure, might need to be adapted for NR
typedef struct {
  /// buffer status for each lcgid
  uint8_t  BSR[NR_MAX_NUM_LCGID]; // should be more for mesh topology
  /// keep the number of bytes in rlc buffer for each lcgid
  int32_t  BSR_bytes[NR_MAX_NUM_LCGID];
  /// after multiplexing buffer remain for each lcid
  int32_t  LCID_buffer_remain[NR_MAX_NUM_LCID];
  /// sum of all lcid buffer size
  uint16_t  All_lcid_buffer_size_lastTTI;
  /// buffer status for each lcid
  uint8_t  LCID_status[NR_MAX_NUM_LCID];
  /// SR pending as defined in 38.321
  uint8_t  SR_pending;
  /// SR_COUNTER as defined in 38.321
  uint16_t SR_COUNTER;
  /// logical channel group ide for each LCID
  uint8_t  LCGID[NR_MAX_NUM_LCID];
  /// retxBSR-Timer, default value is sf2560
  uint16_t retxBSR_Timer;
  /// retxBSR_SF, number of subframe before triggering a regular BSR
  uint16_t retxBSR_SF;
  /// periodicBSR-Timer, default to infinity
  uint16_t periodicBSR_Timer;
  /// periodicBSR_SF, number of subframe before triggering a periodic BSR
  uint16_t periodicBSR_SF;
  /// default value is 0: not configured
  uint16_t sr_ProhibitTimer;
  /// sr ProhibitTime running
  uint8_t sr_ProhibitTimer_Running;
  ///  default value to n5
  uint16_t maxHARQ_Tx;
  /// default value is false
  uint16_t ttiBundling;
  /// default value is release
  struct DRX_Config *drx_config;
  /// default value is release
  struct MAC_MainConfig__phr_Config *phr_config;
  ///timer before triggering a periodic PHR
  uint16_t periodicPHR_Timer;
  ///timer before triggering a prohibit PHR
  uint16_t prohibitPHR_Timer;
  ///DL Pathloss change value
  uint16_t PathlossChange;
  ///number of subframe before triggering a periodic PHR
  int16_t periodicPHR_SF;
  ///number of subframe before triggering a prohibit PHR
  int16_t prohibitPHR_SF;
  ///DL Pathloss Change in db
  uint16_t PathlossChange_db;

  /// default value is false
  uint16_t extendedBSR_Sizes_r10;
  /// default value is false
  uint16_t extendedPHR_r10;

  //Bj bucket usage per  lcid
  int16_t Bj[NR_MAX_NUM_LCID];
  // Bucket size per lcid
  int16_t bucket_size[NR_MAX_NUM_LCID];
} NR_UE_SCHEDULING_INFO;

typedef enum {
  RA_UE_IDLE = 0,
  GENERATE_PREAMBLE = 1,
  WAIT_RAR = 2,
  WAIT_CONTENTION_RESOLUTION = 3,
  RA_SUCCEEDED = 4,
  RA_FAILED = 5
} RA_state_t;

typedef struct {
  /// PRACH format retrieved from prach_ConfigIndex
  uint16_t prach_format;
  /// Preamble Tx Counter
  uint8_t RA_PREAMBLE_TRANSMISSION_COUNTER;
  /// Preamble Power Ramping Counter
  uint8_t RA_PREAMBLE_POWER_RAMPING_COUNTER;
  /// 2-step RA power offset
  int POWER_OFFSET_2STEP_RA;
  /// Target received power at gNB. Baseline is range -202..-60 dBm. Depends on delta preamble, power ramping counter and step.
  int ra_PREAMBLE_RECEIVED_TARGET_POWER;
  /// PRACH index for TDD (0 ... 6) depending on TDD configuration and prachConfigIndex
  uint8_t ra_TDD_map_index;
  /// RA Preamble Power Ramping Step in dB
  uint32_t RA_PREAMBLE_POWER_RAMPING_STEP;
  ///
  uint8_t RA_PREAMBLE_BACKOFF;
  ///
  uint8_t RA_SCALING_FACTOR_BI;
  /// Indicating whether it is 2-step or 4-step RA
  nr_ra_type_e RA_TYPE;
  /// UE configured maximum output power
  int RA_PCMAX;
} NR_PRACH_RESOURCES_t;

typedef struct {

  // pointer to RACH config dedicated
  NR_RACH_ConfigDedicated_t *rach_ConfigDedicated;
  /// state of RA procedure
  RA_state_t ra_state;
  /// RA contention type
  uint8_t cfra;
  /// RA rx frame offset: compensate RA rx offset introduced by OAI gNB.
  uint8_t RA_offset;
  /// RA-rnti
  uint16_t ra_rnti;
  /// Temporary CRNTI
  uint16_t t_crnti;
  /// number of attempt for rach
  uint8_t RA_attempt_number;
  /// Random-access procedure flag
  uint8_t RA_active;
  /// Random-access preamble index
  int ra_PreambleIndex;
  // When multiple SSBs per RO is configured, this indicates which one is selected in this RO -> this is used to properly compute the PRACH preamble
  uint8_t ssb_nb_in_ro;

  /// Random-access window counter
  int16_t RA_window_cnt;
  /// Flag to monitor if matching RAPID was received in RAR
  uint8_t RA_RAPID_found;
  /// Flag to monitor if BI was received in RAR
  uint8_t RA_BI_found;
  /// Random-access backoff counter
  int16_t RA_backoff_indicator;
  /// Flag to indicate whether preambles Group A was used
  uint8_t RA_usedGroupA;
  /// RA backoff counter
  int16_t RA_backoff_cnt;
  /// RA max number of preamble transmissions
  int preambleTransMax;
  /// Nb of preambles per SSB
  long cb_preambles_per_ssb;
  int starting_preamble_nb;

  /// Received TPC command (in dB) from RAR
  int8_t Msg3_TPC;
  /// Flag to indicate whether it is the first Msg3 to be transmitted
  uint8_t first_Msg3;
  /// RA Msg3 size in bytes
  uint8_t Msg3_size;

  /// Random-access Contention Resolution Timer active flag
  uint8_t RA_contention_resolution_timer_active;
  int RA_contention_resolution_target_frame;
  int RA_contention_resolution_target_slot;
  /// Transmitted UE Contention Resolution Identifier
  uint8_t cont_res_id[6];

  /// BeamfailurerecoveryConfig
  NR_BeamFailureRecoveryConfig_t RA_BeamFailureRecoveryConfig;

  /// RA SearchSpace
  NR_SearchSpace_t *ss;

  NR_PRACH_RESOURCES_t prach_resources;
} RA_config_t;

typedef struct {
  bool active;
  bool ack_received;
  uint8_t  pucch_resource_indicator;
  uint16_t feedback_to_ul;
  frame_t dl_frame;
  int dl_slot;
  uint8_t ack;
  uint8_t dai;
  int n_CCE;
  int N_CCE;
  int8_t delta_pucch;
} NR_UE_HARQ_STATUS_t;

typedef struct {

  uint8_t freq_hopping;
  uint8_t mcs;
  uint8_t Msg3_t_alloc;
  uint16_t Msg3_f_alloc;

} RAR_grant_t;

typedef struct {
  NR_PUCCH_Resource_t *pucch_resource;
  uint32_t ack_payload;
  uint8_t sr_payload;
  uint32_t csi_part1_payload;
  uint32_t csi_part2_payload;
  int n_sr;
  int n_csi;
  int n_harq;
  int n_CCE;
  int N_CCE;
  int delta_pucch;
  int initial_pucch_id;
} PUCCH_sched_t;

typedef struct {

  uint32_t ssb_index;
  /// SSB RSRP in dBm
  short ssb_rsrp_dBm;
  int consecutive_bch_failures;

} NR_SSB_meas_t;

typedef struct NR_UL_TIME_ALIGNMENT {
  /// TA command and TAGID received from the gNB
  bool ta_apply;
  int ta_command;
  int ta_total;
  uint32_t tag_id;
  int frame;
  int slot;
} NR_UL_TIME_ALIGNMENT_t;

/*!\brief Top level UE MAC structure */
typedef struct {
  NR_UE_L2_STATE_t state;
  NR_ServingCellConfigCommon_t    *scc;
  NR_ServingCellConfigCommonSIB_t *scc_SIB;
  NR_CellGroupConfig_t            *cg;
  int                             servCellIndex;
  NR_CSI_ReportConfig_t           *csirc;
  long                            physCellId;
  ////  MAC config
  int                             first_sync_frame;
  bool                            get_sib1;
  NR_DRX_Config_t                 *drx_Config;
  NR_SchedulingRequestConfig_t    *schedulingRequestConfig;
  NR_BSR_Config_t                 *bsr_Config;
  NR_TAG_Config_t                 *tag_Config;
  NR_PHR_Config_t                 *phr_Config;
  NR_RNTI_Value_t                 *cs_RNTI;
  NR_MIB_t                        *mib;

  NR_UE_DL_BWP_t current_DL_BWP;
  NR_UE_UL_BWP_t current_UL_BWP;
  NR_UL_TIME_ALIGNMENT_t ul_time_alignment;

  NR_BWP_Downlink_t *DLbwp[MAX_NUM_BWP_UE];
  NR_BWP_Uplink_t *ULbwp[MAX_NUM_BWP_UE];
  NR_ControlResourceSet_t *coreset[MAX_NUM_BWP_UE][FAPI_NR_MAX_CORESET_PER_BWP];
  NR_SearchSpace_t *SSpace[MAX_NUM_BWP_UE][FAPI_NR_MAX_SS];

  bool phy_config_request_sent;
  frame_type_t frame_type;

  ///     Type0-PDCCH seach space
  fapi_nr_dl_config_dci_dl_pdu_rel15_t type0_pdcch_dci_config;
  uint32_t type0_pdcch_ss_mux_pattern;
  SFN_C_TYPE type0_pdcch_ss_sfn_c;
  uint32_t type0_pdcch_ss_n_c;
  uint32_t type0_pdcch_consecutive_slots;

  /* PDUs */
  /// Outgoing CCCH pdu for PHY
  CCCH_PDU CCCH_pdu;
  ULSCH_PDU ulsch_pdu;

  /* Random Access */
  /// CRNTI
  uint16_t crnti;
  /// RA configuration
  RA_config_t ra;
  /// SSB index from MIB decoding
  uint8_t mib_ssb;

  nr_csi_report_t csi_report_template[MAX_CSI_REPORTCONFIG];

  /// measurements from CSI-RS
  fapi_nr_csirs_measurements_t csirs_measurements;

  /// Last NDI of UL HARQ processes
  uint8_t UL_ndi[NR_MAX_HARQ_PROCESSES];
  /// first ULTX of UL HARQ processes
  int first_ul_tx[NR_MAX_HARQ_PROCESSES];
  ////	FAPI-like interface message
  fapi_nr_ul_config_request_t *ul_config_request;
  fapi_nr_dl_config_request_t *dl_config_request;

  ///     Interface module instances
  nr_ue_if_module_t       *if_module;
  nr_phy_config_t         phy_config;
  nr_synch_request_t      synch_request;

  /// BSR report flag management
  uint8_t BSR_reporting_active;

  /// LogicalChannelConfig has bearer.
  bool logicalChannelBearer_exist[NR_MAX_NUM_LCID];
  NR_UE_SCHEDULING_INFO   scheduling_info;

  /// PHR
  uint8_t PHR_reporting_active;

  NR_Type0_PDCCH_CSS_config_t type0_PDCCH_CSS_config;
  NR_SearchSpace_t *search_space_zero;
  NR_ControlResourceSet_t *coreset0;
  frequency_range_t frequency_range;
  uint16_t nr_band;
  uint8_t ssb_subcarrier_offset;

  NR_SSB_meas_t ssb_measurements;

  dci_pdu_rel15_t def_dci_pdu_rel15[NR_MAX_SLOTS_PER_FRAME][8];

  // Defined for abstracted mode
  nr_downlink_indication_t dl_info;
  NR_UE_HARQ_STATUS_t dl_harq_info[NR_MAX_HARQ_PROCESSES];

  nr_emulated_l1_t nr_ue_emul_l1;

  pthread_mutex_t mutex_dl_info;

} NR_UE_MAC_INST_t;


// The PRACH Config period is a series of selected slots in one or multiple frames
typedef struct prach_conf_period {
  prach_occasion_slot_t prach_occasion_slot_map[MAX_NB_FRAME_IN_PRACH_CONF_PERIOD][MAX_NB_SLOT_IN_FRAME];
  uint16_t nb_of_prach_occasion; // Total number of PRACH occasions in the PRACH Config period
  uint8_t nb_of_frame; // Size of the PRACH Config period in number of 10ms frames
  uint8_t nb_of_slot; // Nb of slots in each frame
} prach_conf_period_t;

// The association period is a series of PRACH Config periods
typedef struct prach_association_period {
  prach_conf_period_t *prach_conf_period_list[MAX_NB_PRACH_CONF_PERIOD_IN_ASSOCIATION_PERIOD];
  uint8_t nb_of_prach_conf_period; // Nb of PRACH configuration periods within the association period
  uint8_t nb_of_frame; // Total number of frames included in the association period
} prach_association_period_t;

// The association pattern is a series of Association periods
typedef struct prach_association_pattern {
  prach_association_period_t prach_association_period_list[MAX_NB_ASSOCIATION_PERIOD_IN_ASSOCIATION_PATTERN_PERIOD];
  prach_conf_period_t prach_conf_period_list[MAX_NB_PRACH_CONF_PERIOD_IN_ASSOCIATION_PATTERN_PERIOD];
  uint8_t nb_of_assoc_period; // Nb of association periods within the association pattern
  uint8_t nb_of_prach_conf_period_in_max_period; // Nb of PRACH configuration periods within the maximum association pattern period (according to the size of the configured PRACH
  uint8_t nb_of_frame; // Total number of frames included in the association pattern period (after mapping the SSBs and determining the real association pattern length)
} prach_association_pattern_t;

// SSB details
typedef struct ssb_info {
  bool transmitted; // True if the SSB index is transmitted according to the SSB positions map configuration
  prach_occasion_info_t *mapped_ro[MAX_NB_RO_PER_SSB_IN_ASSOCIATION_PATTERN]; // List of mapped RACH Occasions to this SSB index
  uint32_t nb_mapped_ro; // Total number of mapped ROs to this SSB index
} ssb_info_t;

// List of all the possible SSBs and their details
typedef struct ssb_list_info {
  ssb_info_t tx_ssb[MAX_NB_SSB];
  uint8_t   nb_tx_ssb;
} ssb_list_info_t;

void config_dci_pdu(NR_UE_MAC_INST_t *mac, fapi_nr_dl_config_dci_dl_pdu_rel15_t *rel15, fapi_nr_dl_config_request_t *dl_config, int rnti_type, int ss_id);

/*@}*/
#endif /*__LAYER2_MAC_DEFS_H__ */
