/*
 * 945_tuple_lit_declblind_run — #64 + #68: a tuple LITERAL fills the
 * register cursor DECL-BLIND. The #57 decl wire (a declared-tagged element's
 * concrete rvalue widens into its box) stopped at N_LET / N_RETURN; the
 * other two tuple-literal consumers — destructure-REASSIGN (N_MASSIGN, #64)
 * and CALL-ARG send (#68) — still rode the decl-less route, so a declared-
 * tagged element was stored/sent WORD-0 ONLY (the box tag never set) and the
 * cursor skewed every later element. Both stages, #263 gate-blind: the asm
 * was byte-identical cs==ww and both ran wrong, so only RUNTIME catches it.
 *
 * Fix (both stages, byte-identical per rule 10): N_MASSIGN builds a DECLARED
 * tuple type from the lvalue binding types and threads it into the cursor
 * fill + receive (a `_` lvalue, never type-stamped, falls back to the rhs
 * literal element type for its stride); the call-arg send/restage/drain key
 * on the PARAM tuple type (the literal's element-constructed type undercounts
 * a wide tagged box). The single residual generic cgexpr(N_TUPLE) arm is
 * provably non-widening (the constructed type IS the governing type there).
 *
 * Every RUN row reads the box PAYLOAD back (binds n and asserts its VALUE),
 * not merely which match arm fired — a skew that sets the tag right but
 * corrupts the payload still fails. Rows (RUN unless marked ERR):
 *   massign_tagged  `a,b=(7i64,99)` into a:(i32|i64); n==7 ⇒ 1, else 3;
 *                   wrong arm ⇒ 0; garbage-tag fall-through ⇒ 2 (base).
 *   callarg_tagged  `f((7i64,99))` param (ev,i64); match t.0, n==7 ⇒ 1.
 *                   base: garbage tag ⇒ fall-through ⇒ 2.
 *   massign_blank   `_,a=(99,7i64)` — `_` stride + named box widen; the box
 *                   is element 1 (off the `_`-aligned cursor). n==7 ⇒ 1.
 *                   base: word-0-only store corrupts a's tag ⇒ fall-through ⇒
 *                   2 (the box's tag sits at word0; the lone scalar word
 *                   overwrites it — verified on pristine abd97e6).
 *   callarg_drain   `g((7i64, 35))` param (ev,i64); g returns (box payload)
 *                   + t.1. This is the #68 DRAIN teeth (ken's verified probe
 *                   shape): the param-aware drain must pop the box's 2 words
 *                   AND the trailing i64 together. base: box is word-0 only
 *                   so the i64 arm never fires (payload 0) ⇒ 0 + 35 = 35;
 *                   post: 7 + 35 = 42. base 35 ≠ 42, and the +35 simultaneously
 *                   proves the trailing arg still lands in its reg.
 *   nested_tuple_arg [ERR] `h(((1,2),3))` param ((i32,i32),i64): a NESTED-
 *                   TUPLE tuple-arg element has no transport and stays rule-7
 *                   LOUD (the fix graduates ONLY a declared-tagged element;
 *                   the TY_TUPLE/STRUCT/ARRAY arms are preserved). Asserts the
 *                   build FAILS (nonzero) on BOTH drivers — locks the
 *                   preserved loudness so a future widen-everything regresses.
 *
 * RUN rows: build+run on BOTH drivers AND cs==ww .s byte-identical (rule 10).
 * NNN<950, self-contained (/tmp, no imports), so rule-14's selfhost-sibling
 * race does not apply (903/940/945 precedent).
 */
#include <stdio.h>
#include <stdlib.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;
}

static int
slurp_eq(const char *a, const char *b)
{
	FILE *fa = fopen(a, "rb");
	FILE *fb = fopen(b, "rb");
	if (!fa || !fb) { if (fa) fclose(fa); if (fb) fclose(fb); return -1; }
	int rc = 0;
	for (;;) {
		int ca = fgetc(fa), cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	return rc;
}

/* builderr: the build must FAIL (rule-7 loud); RUN rows leave it 0. */
struct row { const char *label; const char *src; int want; int builderr; };

static const struct row rows[] = {
	{ "massign_tagged",
	  "package main;\n"
	  "type ev = (i32 | i64);\n"
	  "export fn main() i32 = {\n"
	  "	let a: ev = 5i32;\n"
	  "	let b: i64 = 0;\n"
	  "	a, b = (7i64, 99);\n"
	  "	match (a) {\n"
	  "	case let n: i64 => { if (n == 7) { return 1; }; return 3; };\n"
	  "	case let m: i32 => { return 0; };\n"
	  "	};\n"
	  "	return 2;\n"
	  "};\n", 1, 0 },
	{ "callarg_tagged",
	  "package main;\n"
	  "type ev = (i32 | i64);\n"
	  "fn f(t: (ev, i64)) i32 = {\n"
	  "	match (t.0) {\n"
	  "	case let n: i64 => { if (n == 7) { return 1; }; return 3; };\n"
	  "	case let m: i32 => { return 0; };\n"
	  "	};\n"
	  "	return 2;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	return f((7i64, 99));\n"
	  "};\n", 1, 0 },
	{ "massign_blank",
	  "package main;\n"
	  "type ev = (i32 | i64);\n"
	  "export fn main() i32 = {\n"
	  "	let a: ev = 5i32;\n"
	  "	_, a = (99, 7i64);\n"
	  "	match (a) {\n"
	  "	case let n: i64 => { if (n == 7) { return 1; }; return 3; };\n"
	  "	case let m: i32 => { return 0; };\n"
	  "	};\n"
	  "	return 2;\n"
	  "};\n", 1, 0 },
	{ "callarg_drain",
	  "package main;\n"
	  "type ev = (i32 | i64);\n"
	  "fn g(t: (ev, i64)) i32 = {\n"
	  "	let bp: i64 = 0;\n"
	  "	match (t.0) {\n"
	  "	case let n: i64 => { bp = n; };\n"
	  "	case let m: i32 => { bp = 0; };\n"
	  "	};\n"
	  "	return (bp + t.1): i32;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	return g((7i64, 35));\n"
	  "};\n", 42, 0 },
	{ "nested_tuple_arg",
	  "package main;\n"
	  "fn h(t: ((i32, i32), i64)) i32 = {\n"
	  "	return 0;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	return h(((1, 2), 3));\n"
	  "};\n", 0, 1 },
};

/* build+run via a driver (ww / ww_ww); returns 0 pass, nonzero fail. */
static int
run_driver(const char *driver, const struct row *r, int i)
{
	char tmpdir[96], src[128], outbin[128], errf[128], rmcmd[160], cmd[1024];
	snprintf(tmpdir, sizeof tmpdir, "/tmp/tldb_%d_d_%d", getpid(), i);
	mkdir(tmpdir, 0755);
	snprintf(src, sizeof src, "%s/tldb_%d_%d.ww", tmpdir, getpid(), i);
	snprintf(outbin, sizeof outbin, "%s/tldb_%d_%d", tmpdir, getpid(), i);
	snprintf(errf, sizeof errf, "%s/err", tmpdir);
	snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpdir);

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

	snprintf(cmd, sizeof cmd, "%s build -o %s %s >/dev/null 2>%s",
	    driver, outbin, src, errf);
	int brc = runwait(cmd);
	/* ERR row: the rule-7 loud arm must fire — build FAILS (nonzero). A
	 * clean build means the preserved loudness regressed. */
	if (r->builderr) {
		int ok = (brc != 0);
		if (!ok)
			fprintf(stderr, "row[%s]: %s built clean, expected "
			    "rule-7 loud build-fail\n", r->label, driver);
		runwait(rmcmd);
		return ok ? 0 : 1;
	}
	if (brc != 0) {
		fprintf(stderr, "row[%s]: build via %s failed\n",
		    r->label, driver);
		runwait(rmcmd);
		return -1;
	}

	int got = runwait(outbin);

	runwait(rmcmd);
	if (got != r->want) {
		fprintf(stderr, "row[%s]: %s exit %d, want %d\n",
		    r->label, driver, got, r->want);
		return 1;
	}
	return 0;
}

/* cs==ww .s byte-id (rule 10). */
static int
byteid(const char *w6c, const char *w6c_ww, const struct row *r, int i)
{
	char src[96], cs_s[96], ws_s[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/tldb_bi_%d_%d.ww", getpid(), i);
	snprintf(cs_s, sizeof cs_s, "/tmp/tldb_bi_%d_%d_cs.s", getpid(), i);
	snprintf(ws_s, sizeof ws_s, "/tmp/tldb_bi_%d_%d_ww.s", getpid(), i);

	FILE *f = fopen(src, "wb");
	if (!f) return -1;
	fputs(r->src, f);
	fclose(f);

	int rc = 0;
	snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null", w6c, cs_s, src);
	if (runwait(cmd) != 0) { fprintf(stderr, "row[%s]: w6c failed\n", r->label); rc = 1; }
	else {
		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null", w6c_ww, ws_s, src);
		if (runwait(cmd) != 0) { fprintf(stderr, "row[%s]: w6c_ww failed\n", r->label); rc = 1; }
		else if (slurp_eq(cs_s, ws_s) != 0) {
			fprintf(stderr, "row[%s]: cstage/wwstage .s DIFFER "
			    "(rule-10 byte-id)\n", r->label);
			rc = 1;
		}
	}
	unlink(src); unlink(cs_s); unlink(ws_s);
	return rc;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[512];
	if (bin[0] != '/') {
		char cwd[256];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	char cdrv[640], wdrv[640], w6c[640], w6c_ww[640];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);
	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);

	struct { const char *name; const char *path; int gated; }
	drivers[] = {
		{ "cstage",  cdrv, 0 },
		{ "wwstage", wdrv, 1 },
		{ NULL, NULL, 0 },
	};

	int n = (int)(sizeof rows / sizeof rows[0]);
	int total = 0, fail = 0;

	for (int d = 0; drivers[d].name; d++) {
		if (drivers[d].gated && access(drivers[d].path, X_OK) != 0) {
			fprintf(stderr, "tuple_lit_declblind: skip %s (no %s)\n",
			    drivers[d].name, drivers[d].path);
			continue;
		}
		for (int i = 0; i < n; i++) {
			total++;
			if (run_driver(drivers[d].path, &rows[i], i) != 0) fail++;
		}
	}

	if (access(w6c_ww, X_OK) == 0) {
		for (int i = 0; i < n; i++) {
			if (rows[i].builderr) continue;	/* no .s to compare */
			total++;
			if (byteid(w6c, w6c_ww, &rows[i], i) != 0) fail++;
		}
	}

	if (fail) {
		fprintf(stderr, "tuple_lit_declblind: %d/%d checks failed\n",
		    fail, total);
		return 1;
	}
	printf("tuple_lit_declblind: %d/%d ok\n", total, total);
	return 0;
}