#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

#define DF_USAGE "Usage: df [-k] [-P] [file...]"
#define FS_NAME_LEN 256
#define HEADER_FMT "Filesystem %u-blocks Used Available Capacity Mounted on\n"

struct fs_results {
	const char *name;
	unsigned int total;
	unsigned int used;
	const char *root;
};

static void display_results(struct fs_results results[], size_t results_nb, bool display_in_kb) {
	unsigned int block_size = display_in_kb ? 1024 : 512;
	printf(HEADER_FMT, block_size);

	for (size_t i = 0; i < results_nb; i++) {
		struct fs_results cur = results[i];
		unsigned int available = cur.total - cur.used;
		unsigned int capacity = (cur.used / (float) cur.total) * 100;
		printf("%s %d %d %d %d%% %s\n", cur.name, cur.total, cur.used, available, capacity, cur.root);
	}

}

int df_main(int argc, char *argv[]) {
	bool display_in_kb = false;
	int ret = 0;

	while ((ret = getopt(argc, argv, "kP")) != -1) {
		switch (ret) {
			case 'k':
				display_in_kb = true;
				break;

			case 'P':
				break;

			default:
				fputs(DF_USAGE, stderr);
				return EXIT_FAILURE;
		}
	}

	struct fs_results results[] = {
		{
			.name = "test",
			.total = 872986112,
			.used = 95206402,
			.root = "/dev/test",
		}
	};

	display_results(results, 1, false);

	return 0;
}