/*
 * Copyright (C) 2022 Camden Dixie O'Brien
 *
 * This program 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.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this program.  If not, see
 * <https://www.gnu.org/licenses/>.
 */

#include "solve.h"
#include "sud.h"

#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>

#define IFNAME "puzzles"
#define OFNAME "results"
#define NSUD 9000000U
#define FSIZE (NSUD * NCELLS)

int main(void)
{
	int fd;

	fd = open(IFNAME, O_RDONLY);
	if (fd == -1) {
		fputs("Failed to open puzzles file\n", stderr);
		return EXIT_FAILURE;
	}
	char *ibuf = mmap(NULL, FSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
	if (ibuf == MAP_FAILED) {
		fputs("Failed to mmap() puzzles file\n", stderr);
		return EXIT_FAILURE;
	}
	close(fd);

	fd = open(OFNAME, O_RDWR);
	if (fd == -1) {
		fputs("Failed to open results file\n", stderr);
		return EXIT_FAILURE;
	}
	char *obuf = mmap(NULL, FSIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (obuf == MAP_FAILED) {
		fputs("Failed to mmap() results file\n", stderr);
		return EXIT_FAILURE;
	}
	close(fd);

	struct sudoku sud;
	for (unsigned o = 0; o < FSIZE; o += NCELLS) {
		load(&sud, ibuf + o);
		solve(&sud);
		save(&sud, obuf + o);
	}

	munmap(ibuf, FSIZE);
	munmap(obuf, FSIZE);
	return EXIT_SUCCESS;
}