/*
Copyright (c) 2021 - present Advanced Micro Devices, Inc. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#ifndef INCLUDE_RDC_LIB_RDCRdcPerfTimer_H_
#define INCLUDE_RDC_LIB_RDCRdcPerfTimer_H_

#include <stdint.h>
#include <iostream>
#include <vector>
#include <string>
/// \file
/// Timer related class.

namespace amd {
namespace rdc {

class RdcPerfTimer {
 private:
  struct Timer {
    std::string name; /* < name name of time object*/
    uint64_t _freq; /* < _freq frequency*/
    uint64_t _clocks; /* < _clocks number of ticks at end*/
    uint64_t _start; /* < _start start point ticks*/
  };

  std::vector<Timer*> _timers; /*< _timers vector to Timer objects */
  double freq_in_100mhz;

 public:
  RdcPerfTimer(void);
  ~RdcPerfTimer(void);

  /// Create a new timer.
  /// \returns A new timer instance index
  int CreateTimer(void);

  /// Start the timer associated with the given index
  /// \param[in] index Index of the timer to start
  /// \returns int 0 for success, non-zero otherwise
  int StartTimer(int index);

  /// Stop the timer associated with the given index
  /// \param[in] Index Index of the timer to stop
  /// \returns int 0 for success, non-zero otherwise
  int StopTimer(int index);

  /// Reset the timer to 0
  /// param[in] Index of the timer to reset
  /// \returns void
  void ResetTimer(int index);

  /// Read the time value of the timer associated with the provided index.
  /// Units are seconds
  /// \param[in] index Index of the timer to read
  /// \returns double Value of the timer
  double ReadTimer(int index);

 private:
  void Error(std::string str);
  uint64_t CoarseTimestampUs();
  uint64_t MeasureTSCFreqHz();
};


}  // namespace rdc
}  // namespace amd

#endif  // INCLUDE_RDC_LIB_RDCRdcPerfTimer_H_