/**
 * Copyright 2013-2021 Software Radio Systems Limited
 *
 * This file is part of srsLTE.
 *
 * srsLTE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * srsLTE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * A copy of the GNU Affero General Public License can be found in
 * the LICENSE file in the top-level directory of this distribution
 * and at http://www.gnu.org/licenses/.
 *
 */

#ifndef SRSLTE_UCI_NR_H
#define SRSLTE_UCI_NR_H

#include "srslte/phy/fec/crc.h"
#include "srslte/phy/fec/polar/polar_code.h"
#include "srslte/phy/fec/polar/polar_decoder.h"
#include "srslte/phy/fec/polar/polar_encoder.h"
#include "srslte/phy/fec/polar/polar_rm.h"
#include "srslte/phy/phch/pucch_cfg_nr.h"
#include "uci_cfg.h"
#include "uci_cfg_nr.h"
#include <stdbool.h>
#include <stdint.h>

/**
 * @brief NR-UCI Encoder/decoder initialization arguments
 */
typedef struct {
  bool  disable_simd;         ///< Disable Polar code SIMD
  float block_code_threshold; ///< Set normalised block code threshold (receiver only)
} srslte_uci_nr_args_t;

typedef struct {
  srslte_polar_rm_t      rm_tx;
  srslte_polar_rm_t      rm_rx;
  srslte_polar_encoder_t encoder;
  srslte_polar_decoder_t decoder;
  srslte_crc_t           crc6;
  srslte_crc_t           crc11;
  srslte_polar_code_t    code;
  uint8_t*               bit_sequence; ///< UCI bit sequence
  uint8_t*               c;            ///< UCI code-block prior encoding or after decoding
  uint8_t*               allocated;    ///< Polar code intermediate
  uint8_t*               d;            ///< Polar code encoded intermediate
  float                  block_code_threshold;
} srslte_uci_nr_t;

/**
 * @brief Calculates the number of bits carried by PUCCH formats 2, 3 and 4 from the PUCCH resource
 * @remark Defined in TS 38.212 Table 6.3.1.4-1: Total rate matching output sequence length Etot
 * @param resource PUCCH format 2, 3 or 4 Resource provided by upper layers
 * @return The number of bits if the provided resource is valid, SRSLTE_ERROR code otherwise
 */
SRSLTE_API int srslte_uci_nr_pucch_format_2_3_4_E(const srslte_pucch_nr_resource_t* resource);

/**
 * @brief Calculates in advance how many CRC bits will be appended for a given amount of UCI bits (A)
 * @remark Defined in TS 38.212 section 6.3.1.2 Code block segmentation and CRC attachment
 * @param A Number of UCI bits to transmit
 */
SRSLTE_API uint32_t srslte_uci_nr_crc_len(uint32_t A);

/**
 * @brief Initialises NR-UCI encoder/decoder object
 * @param[in,out] q NR-UCI object
 * @param[in] args Configuration arguments
 * @return SRSLTE_SUCCESS if initialization is successful, SRSLTE_ERROR code otherwise
 */
SRSLTE_API int srslte_uci_nr_init(srslte_uci_nr_t* q, const srslte_uci_nr_args_t* args);

/**
 * @brief Deallocates NR-UCI encoder/decoder object
 * @param[in,out] q NR-UCI object
 */
SRSLTE_API void srslte_uci_nr_free(srslte_uci_nr_t* q);

/**
 * @brief Encodes UCI bits
 *
 * @attention Compatible only with PUCCH formats 2, 3 and 4
 *
 * @remark Defined in TS 38.212 section 6.3.1.1
 *
 * @param[in,out] q NR-UCI object
 * @param[in] pucch_cfg Higher layers PUCCH configuration
 * @param[in] uci_cfg UCI configuration
 * @param[in] uci_value UCI values
 * @param[out] o Output encoded bits
 * @return Number of encoded bits if encoding is successful, SRSLTE_ERROR code otherwise
 */
SRSLTE_API int srslte_uci_nr_encode_pucch(srslte_uci_nr_t*                  q,
                                          const srslte_pucch_nr_resource_t* pucch_resource,
                                          const srslte_uci_cfg_nr_t*        uci_cfg,
                                          const srslte_uci_value_nr_t*      value,
                                          uint8_t*                          o);

/**
 * @brief Decoder UCI bits
 *
 * @attention Compatible only with PUCCH formats 2, 3 and 4
 *
 * @param[in,out] q NR-UCI object
 * @param[in] pucch_resource_cfg
 * @param[in] uci_cfg
 * @param[in] llr
 * @param[out] value
 * @return SRSLTE_SUCCESSFUL if it is successful, SRSLTE_ERROR code otherwise
 */
SRSLTE_API int srslte_uci_nr_decode_pucch(srslte_uci_nr_t*                  q,
                                          const srslte_pucch_nr_resource_t* pucch_resource_cfg,
                                          const srslte_uci_cfg_nr_t*        uci_cfg,
                                          int8_t*                           llr,
                                          srslte_uci_value_nr_t*            value);

/**
 * @brief Calculates the total number of UCI bits
 * @param uci_cfg UCI configuration
 * @return The number of total bits carrying HARQ ACK, CSI reports and SR bits
 */
SRSLTE_API uint32_t srslte_uci_nr_total_bits(const srslte_uci_cfg_nr_t* uci_cfg);

/**
 * @brief Converts to string an UCI data structure
 * @param uci_data UCO data structure
 * @param str Destination string
 * @param str_len String length
 * @return Resultant string length
 */
SRSLTE_API uint32_t srslte_uci_nr_info(const srslte_uci_data_nr_t* uci_data, char* str, uint32_t str_len);

#endif // SRSLTE_UCI_NR_H