/*
 * 944_alias_accept_run — SLIM CARRIER (#5-C3 alias fold-2). The 62 K_RUN value
 * rows migrated to test/lang/alias_accept_test.ww (@test, cs==ww byte-id via
 * test-lang-byteid); the cs!=ww NOID row (v2_struct2, #81) to
 * test/lang/alias_accept_runonly_test.ww; the symmetric K_BUILDERR rejects
 * (assert_stays_loud, v2_ambig, v2_ambig2, union_as_bound_54) + the two
 * now-symmetric ex-K_BUILDERR_CS rows (binop_alias_vs_alias, untyped_nestvar,
 * superseded at HEAD) to test/wcc/data/alias_<name>/case.ww runww //ww:error.
 *
 * What survives here is the IRREDUCIBLE per-stage-asymmetric pin no in-language
 * surface can host: cstage builds+RUNS exit 0 while wwstage LOUD-REJECTS
 * (@test needs ww to build; runww //ww:error needs BOTH to fail). Held
 * divergence task #96: ww `&s.len` / `&s.cap` over an alias-typed slice PARAM
 * is "unsupported address-of shape"; cstage classifies the address shape
 * through the alias chase and runs correct. Drew-ruled slim-carrier home
 * (#5-C3, 954_tuprecv precedent).
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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;
}

/* a reject must fail WITH its diagnostic; a crash (no body) is vacuous. */
static int
errlog_has(const char *path, const char *needle)
{
	FILE *f = fopen(path, "rb");
	if (!f) return 0;
	char buf[8192];
	size_t got = fread(buf, 1, sizeof buf - 1, f);
	fclose(f);
	buf[got] = '\0';
	return strstr(buf, needle) != NULL;
}

/* cstage builds+runs (exit 0); wwstage frontend (w6c_ww) loud-rejects wwerr. */
static int
run_row(const char *bin, const char *label, const char *src,
    const char *wwerr, int i)
{
	char dir[96], srcf[160], outbin[160], wwe[160], ss[160], rm[200], cmd[2048];
	snprintf(dir, sizeof dir, "/tmp/aacc_%d_%d", getpid(), i);
	mkdir(dir, 0755);
	snprintf(srcf, sizeof srcf, "%s/c.ww", dir);
	snprintf(outbin, sizeof outbin, "%s/bin", dir);
	snprintf(wwe, sizeof wwe, "%s/ww.err", dir);
	snprintf(ss, sizeof ss, "%s/o.s", dir);
	snprintf(rm, sizeof rm, "rm -rf %s", dir);

	FILE *f = fopen(srcf, "wb");
	if (!f) { runwait(rm); return -1; }
	fputs(src, f);
	fclose(f);

	int ok = 1;
	snprintf(cmd, sizeof cmd,
	    "timeout 20 %s/ww build -o %s %s >/dev/null 2>&1", bin, outbin, srcf);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: cstage build failed (want run)\n", label);
		ok = 0;
	} else if (runwait(outbin) != 0) {
		fprintf(stderr, "row[%s]: cstage run != 0\n", label);
		ok = 0;
	}
	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>%s", bin, ss, srcf, wwe);
	int wrc = runwait(cmd);
	if (!(wrc != 0 && errlog_has(wwe, wwerr))) {
		fprintf(stderr, "row[%s]: wwstage expected reject \"%s\" (rc=%d)\n",
		    label, wwerr, wrc);
		ok = 0;
	}
	runwait(rm);
	return ok ? 0 : 1;
}

struct row { const char *label; const char *src; const char *wwerr; };

static const struct row rows[] = {
	{ "amplen1_bound96",
	  "package main;\n"
	  "type sl1 = []i64;\n"
	  "fn check(s: sl1) i32 = {\n"
	  "	let p: *i64 = &s.len;\n"
	  "	if (*p == 3) { return 0; };\n"
	  "	return 1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let b: []i64 = [1, 2, 3];\n"
	  "	return check(b);\n"
	  "};\n", "unsupported address-of shape" },	/* ww: task #96 */
	{ "amplen2_bound96",
	  "package main;\n"
	  "type sl1 = []i64;\n"
	  "type sl2 = sl1;\n"
	  "fn check(s: sl2) i32 = {\n"
	  "	let p: *i64 = &s.len;\n"
	  "	if (*p == 3) { return 0; };\n"
	  "	return 1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let b: []i64 = [1, 2, 3];\n"
	  "	return check(b);\n"
	  "};\n", "unsupported address-of shape" },	/* ww: task #96 */
	{ "ampcap2_bound96",
	  "package main;\n"
	  "type sl1 = []i64;\n"
	  "type sl2 = sl1;\n"
	  "fn check(s: sl2) i32 = {\n"
	  "	let p: *i64 = &s.cap;\n"
	  "	if (*p == 3) { return 0; };\n"
	  "	return 1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let b: []i64 = [1, 2, 3];\n"
	  "	return check(b);\n"
	  "};\n", "unsupported address-of shape" },	/* ww: task #96 */
};

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[2080];
	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 n = (int)(sizeof rows / sizeof rows[0]);
	int fail = 0;
	for (int i = 0; i < n; i++)
		if (run_row(bin, rows[i].label, rows[i].src, rows[i].wwerr, i) != 0)
			fail++;

	if (fail) {
		fprintf(stderr, "alias_accept (slim): %d/%d rows failed\n", fail, n);
		return 1;
	}
	printf("alias_accept (slim): %d/%d ok\n", n, n);
	return 0;
}