/**
 *
 * \section COPYRIGHT
 *
 * Copyright 2013-2021 Software Radio Systems Limited
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the distribution.
 *
 */

#ifndef SRSRAN_SCHED_NR_H
#define SRSRAN_SCHED_NR_H

#include "sched_nr_cfg.h"
#include "sched_nr_interface.h"
#include "sched_nr_ue.h"
#include "srsran/adt/pool/cached_alloc.h"
#include "srsran/common/slot_point.h"
#include <array>
extern "C" {
#include "srsran/config.h"
}

namespace srsenb {

namespace sched_nr_impl {

class cc_worker;

} // namespace sched_nr_impl

class ul_sched_result_buffer;

class sched_nr final : public sched_nr_interface
{
public:
  explicit sched_nr();
  ~sched_nr() override;

  void stop();
  int  config(const sched_args_t& sched_cfg, srsran::const_span<cell_cfg_t> cell_list) override;
  void ue_cfg(uint16_t rnti, const ue_cfg_t& cfg) override;
  void ue_rem(uint16_t rnti) override;
  bool ue_exists(uint16_t rnti) override;

  int dl_rach_info(uint32_t cc, const rar_info_t& rar_info);

  void dl_ack_info(uint16_t rnti, uint32_t cc, uint32_t pid, uint32_t tb_idx, bool ack) override;
  void ul_crc_info(uint16_t rnti, uint32_t cc, uint32_t pid, bool crc) override;
  void ul_sr_info(uint16_t rnti) override;
  void ul_bsr(uint16_t rnti, uint32_t lcg_id, uint32_t bsr) override;
  void dl_buffer_state(uint16_t rnti, uint32_t lcid, uint32_t newtx, uint32_t retx);

  /// Called once per slot in a non-concurrent fashion
  void slot_indication(slot_point slot_tx) override;
  int  get_dl_sched(slot_point pdsch_tti, uint32_t cc, dl_res_t& result) override;
  int  get_ul_sched(slot_point pusch_tti, uint32_t cc, ul_res_t& result) override;

  void get_metrics(mac_metrics_t& metrics);

private:
  class feedback_manager
  {
  public:
    struct ue_event_t {
      uint16_t                      rnti;
      srsran::move_callback<void()> callback;
    };

    void enqueue_event(uint16_t rnti, srsran::move_callback<void()> ev);
    void get_pending_events(srsran::deque<ue_event_t>& current_events);

  private:
    std::mutex                event_mutex;
    srsran::deque<ue_event_t> next_slot_events;
  };

  void ue_cfg_impl(uint16_t rnti, const ue_cfg_t& cfg);

  // args
  sched_nr_impl::sched_params cfg;
  srslog::basic_logger*       logger = nullptr;

  // slot-specific
  slot_point       current_slot_tx;
  std::atomic<int> worker_count{0};

  using slot_cc_worker = sched_nr_impl::cc_worker;
  std::vector<std::unique_ptr<sched_nr_impl::cc_worker> > cc_workers;

  using ue_map_t = sched_nr_impl::ue_map_t;
  ue_map_t ue_db;

  // management of Sched Result buffering
  std::unique_ptr<ul_sched_result_buffer> pending_results;

  // Feedback management
  feedback_manager                            pending_feedback;
  srsran::deque<feedback_manager::ue_event_t> current_slot_events;

  // metrics extraction
  class ue_metrics_manager;
  std::unique_ptr<ue_metrics_manager> metrics_handler;
};

} // namespace srsenb

#endif // SRSRAN_SCHED_NR_H