/*
 * Copyright (c) Camden Dixie O'Brien
 * SPDX-License-Identifier: AGPL-3.0-only
 */

#ifndef BENCHMARKING_H
#define BENCHMARKING_H

#include <time.h>

typedef struct {
	int reps;
	double total, median, mean, min, max, stddev;
} benchmark_summary_t;

#define CLOCK_MICROS(c) (1000000 * (double)c / CLOCKS_PER_SEC)

#define BENCHMARKING_BEGIN() benchmark_print_header()
#define BENCHMARKING_END() 0

#define START_CLOCK() \
	do { \
		benchmark_start = clock(); \
	} while (0)

#define STOP_CLOCK() \
	do { \
		benchmark_end = clock(); \
	} while (0)

#define RUN_BENCHMARK(reps, name, fn, ...) \
	do { \
		double res[reps]; \
		for (int i = 0; i < reps; ++i) { \
			fn(__VA_ARGS__); \
			res[i] = CLOCK_MICROS(benchmark_end) \
			    - CLOCK_MICROS(benchmark_start); \
		} \
		benchmark_summary_t summary; \
		benchmark_summarise(res, reps, &summary); \
		benchmark_print(name, &summary); \
	} while (0)

extern clock_t benchmark_start, benchmark_end;

void benchmark_summarise(double *res, int reps, benchmark_summary_t *out);
void benchmark_print_header(void);
void benchmark_print(const char *name, const benchmark_summary_t *summary);

#endif