/*
 * 976_stat_run — execute the lib/os stat fixture under the C-side
 * `ww run` driver and assert exit 0.
 *
 * Workflow (mirrors 975_dirs_run's mkdtemp + setenv + rm-rf shape):
 *   1. mkdtemp /tmp/wwstat-XXXXXX — fresh per run, no parallel-test
 *      contention.
 *   2. Populate the scratch tree:
 *        <tmp>/regfile      regular file, 11 bytes "hello world"
 *        <tmp>/symlink   →  ./regfile  (relative symlink)
 *        <tmp>/subdir       directory, mode 0700
 *   3. setenv WW_TEST_STAT_REGFILE / SYMLINK / SUBDIR / NOENT with
 *      the absolute paths; lib/os/stattest.ww reads them via
 *      os.getenv and exercises stat/lstat/fstat/exists.
 *   4. exec `ww run lib/os/stattest.ww`.
 *   5. system("rm -rf <tmp>") regardless of pass/fail.
 *
 * Same wrapper shape as 970-975; cleanup-on-failure is rm-rf'd so a
 * regression never leaves residue under /tmp.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>

static int
runwait(const char *cmd)
{
	int rc = system(cmd);
	if (rc == -1) return -1;
	if (WIFEXITED(rc)) return WEXITSTATUS(rc);
	return 1;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[1024];
	if (bin[0] != '/') {
		char cwd[1024];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}
	char cwd[1024];
	if (getcwd(cwd, sizeof cwd) == NULL) return 1;

	char tmpl[64];
	strcpy(tmpl, "/tmp/wwstat-XXXXXX");
	if (mkdtemp(tmpl) == NULL) {
		perror("mkdtemp");
		return 1;
	}

	char regfile[256], symlink_path[256], subdir[256], noent[256];
	snprintf(regfile, sizeof regfile, "%s/regfile", tmpl);
	snprintf(symlink_path, sizeof symlink_path, "%s/symlink", tmpl);
	snprintf(subdir, sizeof subdir, "%s/subdir", tmpl);
	snprintf(noent, sizeof noent, "%s/does-not-exist", tmpl);

	/* Populate. */
	int fd = open(regfile, O_WRONLY | O_CREAT | O_EXCL, 0644);
	if (fd < 0) { perror("open regfile"); goto cleanup_fail; }
	if (write(fd, "hello world", 11) != 11) {
		perror("write regfile"); close(fd); goto cleanup_fail;
	}
	close(fd);
	if (symlink("./regfile", symlink_path) != 0) {
		perror("symlink"); goto cleanup_fail;
	}
	if (mkdir(subdir, 0700) != 0) {
		perror("mkdir subdir"); goto cleanup_fail;
	}

	setenv("WW_TEST_STAT_REGFILE", regfile, 1);
	setenv("WW_TEST_STAT_SYMLINK", symlink_path, 1);
	setenv("WW_TEST_STAT_SUBDIR", subdir, 1);
	setenv("WW_TEST_STAT_NOENT", noent, 1);

	const char *src = "lib/os/stattest.ww";
	char path[1024], cmd[2048];
	snprintf(path, sizeof path, "%s/%s", cwd, src);
	snprintf(cmd, sizeof cmd, "%s/ww test %s", bin, path);
	int rc = runwait(cmd);

	char rmcmd[256];
	snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpl);
	(void)system(rmcmd);

	if (rc != 0) {
		fprintf(stderr, "stat_run FAIL: %s exited %d\n", src, rc);
		return 1;
	}
	printf("stat_run: %s ok\n", src);
	return 0;

cleanup_fail: {
	char rmcmd[256];
	snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpl);
	(void)system(rmcmd);
	return 1;
} }