#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

/** @brief stat file to get modified date and print name */
void print_file(const char* path) {
	struct stat *info = malloc(sizeof(struct stat));
	stat(path, info);

	struct tm mtime;
	localtime_r(&(info->st_mtime), &mtime);

	free(info);

	printf("%04d-%02d-%02d %02d:%02d:%02d %s\n",
			mtime.tm_year+1900, mtime.tm_mon+1, mtime.tm_mday,
			mtime.tm_hour, mtime.tm_min, mtime.tm_sec,
			path);
}

/** @brief list directory tree recursively */
void ls_rec(const char *path) {
	DIR *dir = opendir(path); // get directory handle (used until all content is listed)
	if (dir == NULL) return; // return early if path is not a directory

	struct dirent *entry;
	while ((entry = readdir(dir)) != NULL) { // read next file in dir
		char full_path[1024]; // current entry name with full path prefix
		snprintf(full_path, sizeof(full_path), "%s/%s", path, entry->d_name); // prepend current directory to current entry

		if (entry->d_type != DT_DIR) {
			print_file(full_path);
			continue; // don't try to print files recursively
		}
		if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
			continue; // ignore current and parent directory

		print_file(full_path);
		ls_rec(full_path);
	}

	closedir(dir); // free directory handle
}

int main(int argc, const char** argv) {
	if (argc < 2) {
		printf("no input directory!\n");
		return 1;
	}

	ls_rec(argv[1]);

	return 0;
}