/**
 * Copyright 2013-2021 Software Radio Systems Limited
 *
 * This file is part of srsRAN.
 *
 * srsRAN 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.
 *
 * srsRAN 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 SRSENB_ENB_EVENTS_H
#define SRSENB_ENB_EVENTS_H

#include <cstdint>
#include <memory>

namespace srslog {
class log_channel;
}

namespace srsenb {

/// This interface logs different kinds of events to the configured channel. By default, if no log channel is configured
/// logging will be disabled.
class event_logger_interface
{
public:
  virtual ~event_logger_interface() = default;

  /// Logs into the underlying log channel any RRC event.
  virtual void log_rrc_event(uint32_t           enb_cc_idx,
                             const std::string& asn1_oct_str,
                             const std::string& asn1_txt_str,
                             unsigned           type,
                             unsigned           additional_info,
                             uint16_t           rnti) = 0;

  /// Logs into the underlying log channel the S1 context create event.
  virtual void log_s1_ctx_create(uint32_t enb_cc_idx, uint32_t mme_id, uint32_t enb_id, uint16_t rnti) = 0;

  /// Logs into the underlying log channel the S1 context delete event.
  virtual void log_s1_ctx_delete(uint32_t enb_cc_idx, uint32_t mme_id, uint32_t enb_id, uint16_t rnti) = 0;

  /// Logs into the underlying log channel when a sector has been started.
  virtual void log_sector_start(uint32_t cc_idx, uint32_t pci, uint32_t cell_id, const std::string &hnb_name) = 0;

  /// Logs into the underlying log channel when a sector has been stopped.
  virtual void log_sector_stop(uint32_t cc_idx, uint32_t pci, uint32_t cell_id, const std::string &hnb_name) = 0;

  /// Logs into the underlying log channel a measurement report event.
  virtual void log_measurement_report(uint32_t           enb_cc_idx,
                                      const std::string& asn1_oct_str,
                                      const std::string& asn1_txt_str,
                                      uint16_t           rnti) = 0;

  /// Logs into the underlying log channel a RLF report.
  virtual void log_rlf_report(uint32_t           enb_cc_idx,
                              const std::string& asn1_oct_str,
                              const std::string& asn1_txt_str,
                              uint16_t           rnti) = 0;

  /// Logs into the underlying log channel a RLF detection event.
  virtual void log_rlf_detected(uint32_t enb_cc_idx, const std::string& type, uint16_t rnti) = 0;

  /// Logs into the underlying log channel a handover command event.
  virtual void log_handover_command(uint32_t enb_cc_idx,
                                    uint32_t target_pci,
                                    uint32_t target_earfcn,
                                    uint16_t new_ue_rnti,
                                    uint16_t rnti) = 0;

  /// Logs into the underlying log channel a connection resume event.
  virtual void log_connection_resume(uint32_t enb_cc_idx, uint16_t resume_rnti, uint16_t rnti) = 0;
};

/// Singleton class to provide global access to the event_logger_interface interface.
class event_logger
{
  event_logger() = default;

public:
  /// ASN1 output printing format.
  enum class asn1_output_format { text, octets };

  /// Returns the instance of the event logger.
  static event_logger_interface& get();

  /// Uses the specified log channel for event logging.
  /// NOTE: This method is not thread safe.
  static void configure(srslog::log_channel& c, asn1_output_format asn1_format);

private:
  static std::unique_ptr<event_logger_interface> pimpl;
};

} // namespace srsenb

#endif // SRSENB_ENB_EVENTS_H