/*
 * 949_missingpkg — #16 ENFORCE-driver, BOTH branches (rob A inline-aware):
 *   miss    — `import nosuchpkg;` with no inline package → the cstage `ww`
 *             driver exits nonzero + "ww: cannot find package nosuchpkg"
 *             (was a silent `continue` masking a typo'd/missing package).
 *   inline  — a single-file multi-package unit (`package aa; … package
 *             main; import aa; …`) names a package the bundler can't pull
 *             as a file but the checker binds inline; the locate-miss is
 *             inline-satisfied → ww BUILDS + runs green (exit 7). Pins the
 *             skip branch so the fatal can't regress into over-firing on
 *             the legitimate inline-package import-crutch pattern.
 *
 * Cstage driver in a 9xx (rule-14: only WWSTAGE-driver tests are pinned to
 * 950/990-997). The ww_ww twin + cstage/wwstage parity live in 993_ww_ww.
 * Fixtures staged in /tmp so driver intermediates never touch the tree.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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;
}

/* miss branch: `ww build` a missing import → nonzero + "cannot find
 * package nosuchpkg" on stderr. Returns 0 on success. */
static int
run_miss(const char *bin)
{
	int pid = getpid();
	char src[64], errf[64], outb[64], comb[80], cmd[2048], line[4096];
	snprintf(src,  sizeof src,  "/tmp/mp949_miss_%d.ww", pid);
	snprintf(errf, sizeof errf, "/tmp/mp949_miss_%d.err", pid);
	/* -o a writable /tmp stem (not /dev/null): post-T3 the intermediate
	 * .combined.ww/.s/.o follow -o, so /dev/null would yield an
	 * uncreatable /dev/null.combined.ww and mask the missing-pkg fatal. */
	snprintf(outb, sizeof outb, "/tmp/mp949_miss_%d.out", pid);
	snprintf(comb, sizeof comb, "/tmp/mp949_miss_%d.out.combined.ww", pid);
	FILE *f = fopen(src, "w");
	if (!f) { fprintf(stderr, "949 FAIL: stage miss\n"); return 1; }
	fputs("import nosuchpkg;\n"
	    "export fn main() i32 = { return 0; };\n", f);
	fclose(f);

	snprintf(cmd, sizeof cmd, "%s/ww build %s -o %s 2>%s",
	    bin, src, outb, errf);
	int rc = runwait(cmd);
	if (rc == 0) {
		fprintf(stderr, "949 FAIL: ww accepted a missing import\n");
		unlink(src); unlink(errf); unlink(outb); unlink(comb);
		return 1;
	}
	int found = 0;
	f = fopen(errf, "r");
	if (f) {
		while (fgets(line, sizeof line, f))
			if (strstr(line, "cannot find package nosuchpkg")) {
				found = 1; break;
			}
		fclose(f);
	}
	unlink(src); unlink(errf); unlink(outb); unlink(comb);
	if (!found) {
		fprintf(stderr, "949 FAIL: no 'cannot find package nosuchpkg' "
		    "on stderr\n");
		return 1;
	}
	return 0;
}

/* inline branch: a single-file multi-package unit whose `import aa` is
 * satisfied by the inline `package aa` must BUILD (locate-miss → inline
 * scan → skip) and run to exit 7. Returns 0 on success. */
static int
run_inline(const char *bin)
{
	int pid = getpid();
	char src[64], outb[64], cmd[2048];
	snprintf(src,  sizeof src,  "/tmp/mp949_inl_%d.ww", pid);
	snprintf(outb, sizeof outb, "/tmp/mp949_inl_%d", pid);
	FILE *f = fopen(src, "w");
	if (!f) { fprintf(stderr, "949 FAIL: stage inline\n"); return 1; }
	fputs("package aa;\n"
	    "export fn getv() i32 = { return 7; };\n"
	    "package main;\n"
	    "import aa;\n"
	    "export fn main() i32 = { return aa.getv(); };\n", f);
	fclose(f);

	/* `ww build` emits the binary by basename in the cwd, so build from
	 * /tmp to keep both source and output out of the tree. */
	snprintf(cmd, sizeof cmd,
	    "cd /tmp && %s/ww build mp949_inl_%d.ww >/dev/null 2>&1", bin, pid);
	int rc = runwait(cmd);
	if (rc != 0) {
		fprintf(stderr, "949 FAIL: inline-package build failed "
		    "(inline-skip branch regressed)\n");
		unlink(src);
		return 1;
	}
	int got = runwait(outb);
	unlink(src); unlink(outb);
	if (got != 7) {
		fprintf(stderr, "949 FAIL: inline-package exit=%d want=7\n", got);
		return 1;
	}
	return 0;
}

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;
	}

	int fail = 0;
	fail += run_miss(bin);
	fail += run_inline(bin);
	if (fail) return 1;
	printf("missing-package: miss->fatal + inline->skip(build+run) both pinned\n");
	return 0;
}