#pragma once

#include <time.h>
#include <stddef.h>
#include <assert.h>

enum timer_status {
  TIMER_STOPPED,
  TIMER_RUNNING,
};

struct stopwatch_time {
  int integer_value;
  int integer_digits;
  int fraction_value;
  int fraction_digits;
};

struct running_counter {
  struct timespec start;  // (absolute)
  struct timespec offset; // (relative)
};

struct timer_state {
  struct running_counter counter;
  struct stopwatch_time time;
  enum timer_status status;
  int _pad;
};

static_assert((sizeof (struct running_counter)) == (8 * 2) * 2);
static_assert((sizeof (struct stopwatch_time)) == 4 * 4);
static_assert((sizeof (enum timer_status)) == 4);
static_assert((sizeof (struct timer_state)) == ((8 * 2) * 2) + (4 * 4) + 4 + 4);
static_assert((offsetof (struct timer_state, counter)) == 0);
static_assert((offsetof (struct timer_state, time   )) == (8 * 2) * 2);
static_assert((offsetof (struct timer_state, status )) == ((8 * 2) * 2) + (4 * 4));