/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#include <grpc++/support/config.h>
#include <grpc++/support/time.h>
#include <grpc/support/time.h>

using std::chrono::duration_cast;
using std::chrono::nanoseconds;
using std::chrono::seconds;
using std::chrono::system_clock;
using std::chrono::high_resolution_clock;

namespace grpc {

void Timepoint2Timespec(const system_clock::time_point& from,
                        gpr_timespec* to) {
  system_clock::duration deadline = from.time_since_epoch();
  seconds secs = duration_cast<seconds>(deadline);
  if (from == system_clock::time_point::max() ||
      secs.count() >= gpr_inf_future(GPR_CLOCK_REALTIME).tv_sec ||
      secs.count() < 0) {
    *to = gpr_inf_future(GPR_CLOCK_REALTIME);
    return;
  }
  nanoseconds nsecs = duration_cast<nanoseconds>(deadline - secs);
  to->tv_sec = (int64_t)secs.count();
  to->tv_nsec = (int32_t)nsecs.count();
  to->clock_type = GPR_CLOCK_REALTIME;
}

void TimepointHR2Timespec(const high_resolution_clock::time_point& from,
                          gpr_timespec* to) {
  high_resolution_clock::duration deadline = from.time_since_epoch();
  seconds secs = duration_cast<seconds>(deadline);
  if (from == high_resolution_clock::time_point::max() ||
      secs.count() >= gpr_inf_future(GPR_CLOCK_REALTIME).tv_sec ||
      secs.count() < 0) {
    *to = gpr_inf_future(GPR_CLOCK_REALTIME);
    return;
  }
  nanoseconds nsecs = duration_cast<nanoseconds>(deadline - secs);
  to->tv_sec = (int64_t)secs.count();
  to->tv_nsec = (int32_t)nsecs.count();
  to->clock_type = GPR_CLOCK_REALTIME;
}

system_clock::time_point Timespec2Timepoint(gpr_timespec t) {
  if (gpr_time_cmp(t, gpr_inf_future(t.clock_type)) == 0) {
    return system_clock::time_point::max();
  }
  t = gpr_convert_clock_type(t, GPR_CLOCK_REALTIME);
  system_clock::time_point tp;
  tp += duration_cast<system_clock::time_point::duration>(seconds(t.tv_sec));
  tp +=
      duration_cast<system_clock::time_point::duration>(nanoseconds(t.tv_nsec));
  return tp;
}

}  // namespace grpc