/*
 * 944_alias_def_addr_run — #5 alias arc F2a batch 3 c2 (task #88):
 * defisaddressable (cgen.ww:3089) keyed the array leg on the UNCHASED
 * syntactic dtnode (N_TARRAY) — `&D` where D is a def whose declared
 * type is an ALIAS of an array missed the gate and fell to the rule-7
 * loud error "cannot take address of non-addressable def". LOUD class,
 * but the gate was lying: the ww def-array DATA emitter already peels
 * TY_NAMED transitively (emitdefconstants' array arm), so the alias
 * def HAS a DATA symbol (probe-observed: `DATA main.D(SB)` emitted
 * byte-id by both stages for the &-less program). Gate-only fix —
 * tichase(dtn.type_) == TY_ARRAY — restores gate == emission set; no
 * emitter twin. cstage registers def arrays via the g-fold-G1 chased
 * let_isarray and gates TK_AMP on def_isarraydef (cgen.c:3975-3977),
 * so cs is the runtime-correct reference (observed 0 on every row).
 *
 *   row         | shape                                        | want
 *   ------------+----------------------------------------------+-----
 *   def_ctrl    | plain [3]int def; &D; read via ptr           | 0
 *   def_l1      | 1-level alias def array, &D                  | 0
 *   def_l2      | 2-level, readback via cast-to-base ptr       | 0
 *   def_order   | type decl AFTER the def                      | 0
 *   def_struct  | alias-typed STRUCT def, &D (defvarstructinfo |
 *               | leg already chased — held throughout)        | 0
 *   def_nonaddr | str def, &D -> rule-7 loud error             | LOUD
 *
 * Pre-fix: def_l1/def_l2/def_order ww LOUD / cs 0; controls 0/0.
 * Post-fix: every value row 0/0 byte-id; def_nonaddr STAYS LOUD both
 * stages with a BYTE-IDENTICAL diagnostic (the error-path pin —
 * genuinely symbol-less defs must keep firing the rule-7 tail, and
 * the tail's text is itself a convergence surface).
 *
 * def_l2's readback casts to the BASE array ptr (`p: *[3]int`) before
 * the deref-index: the natural `(*p)[2]` spelling over a 2-LEVEL-alias
 * pointee trips a SEPARATE pre-existing CSTAGE double-deref (spurious
 * MOVQ (AX),AX, SEGV; def-INDEPENDENT — a local twin reproduces it;
 * ww runs it correctly) — filed as task #93 (#85 type_unwrap kin, F2b
 * OUT territory), deliberately not pinned here.
 */
#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;
}

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;
}

/* mustfail: build must FAIL on BOTH drivers (the error-path pin);
 * such rows trade the asm byte-id check for a DIAGNOSTIC byte-id
 * check (w6c vs w6c_ww stderr compared byte-for-byte). */
struct row { const char *label; const char *src; int want; int mustfail; };

static const struct row rows[] = {
	{ "def_ctrl",
	  "package main;\n"
	  "def D: [3]int = [1000: int, 2000: int, 3000: int];\n"
	  "export fn main() i32 = {\n"
	  "	let p: *[3]int = &D;\n"
	  "	if ((*p)[2] != 3000) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0 },
	{ "def_l1",
	  "package main;\n"
	  "type arr = [3]int;\n"
	  "def D: arr = [1000: int, 2000: int, 3000: int];\n"
	  "export fn main() i32 = {\n"
	  "	let p: *arr = &D;\n"
	  "	if ((*p)[2] != 3000) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0 },
	/* cast-to-base readback — see the header note on task #93. */
	{ "def_l2",
	  "package main;\n"
	  "type arr = [3]int;\n"
	  "type arr2 = arr;\n"
	  "def D: arr2 = [1000: int, 2000: int, 3000: int];\n"
	  "export fn main() i32 = {\n"
	  "	let p: *arr2 = &D;\n"
	  "	let q: *[3]int = p: *[3]int;\n"
	  "	if ((*q)[2] != 3000) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0 },
	{ "def_order",
	  "package main;\n"
	  "def D: arr = [1000: int, 2000: int, 3000: int];\n"
	  "export fn main() i32 = {\n"
	  "	let p: *arr = &D;\n"
	  "	if ((*p)[2] != 3000) { return 1; };\n"
	  "	return 0;\n"
	  "};\n"
	  "type arr = [3]int;\n", 0, 0 },
	/* PREMISE-5 leg: defvarstructinfo already walks aliaslookup
	 * transitively — held before and after. */
	{ "def_struct",
	  "package main;\n"
	  "type pt = struct { x: int, y: int };\n"
	  "type pt2 = pt;\n"
	  "def D: pt2 = pt2{x=1000, y=2000};\n"
	  "export fn main() i32 = {\n"
	  "	let p: *pt2 = &D;\n"
	  "	if (p.y != 2000) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0 },
	/* str def has no DATA symbol — the rule-7 loud tail must keep
	 * firing (error-path pin). */
	{ "def_nonaddr",
	  "package main;\n"
	  "def S: str = \"hello\";\n"
	  "export fn main() i32 = {\n"
	  "	let p = &S;\n"
	  "	return 0;\n"
	  "};\n", 0, 1 },
};

static int
run_driver(const char *driver, const struct row *r, int i)
{
	char src[96], tmpdir[96], errf[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/ada_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/ada_%d_d_%d", getpid(), i);
	snprintf(errf, sizeof errf, "/tmp/ada_%d_e_%d", getpid(), i);

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

	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd,
	    "cd %s && timeout 20 %s build %s >/dev/null 2>%s",
	    tmpdir, driver, src, errf);
	int brc = runwait(cmd);
	if (r->mustfail) {
		unlink(src); unlink(errf); rmdir(tmpdir);
		if (brc == 0) {
			fprintf(stderr, "row[%s]: %s built but must fail "
			    "loud\n", r->label, driver);
			return 1;
		}
		return 0;
	}
	if (brc != 0) {
		fprintf(stderr, "row[%s]: build via %s failed\n",
		    r->label, driver);
		unlink(src); unlink(errf); rmdir(tmpdir);
		return -1;
	}

	const char *base = strrchr(src, '/');
	base = base ? base + 1 : src;
	char outbin[256];
	snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
	char *dot = strrchr(outbin, '.');
	if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
	int got = runwait(outbin);

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

static int
asm_byte_identical(const char *bin, const struct row *r, int i)
{
	char src[96], cs[96], ws[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/ada_asm_%d_%d.ww", getpid(), i);
	snprintf(cs,  sizeof cs,  "/tmp/ada_asm_%d_%d_c.s", getpid(), i);
	snprintf(ws,  sizeof ws,  "/tmp/ada_asm_%d_%d_w.s", getpid(), i);

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

	snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s 2>/dev/null", bin, cs, src);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: w6c errored\n", r->label);
		unlink(src);
		return -1;
	}
	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>/dev/null",
	    bin, ws, src);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: w6c_ww errored\n", r->label);
		unlink(src); unlink(cs);
		return -1;
	}
	int rc = slurp_eq(cs, ws);
	if (rc != 0)
		fprintf(stderr, "row[%s]: cstage vs wwstage asm differs\n",
		    r->label);
	unlink(src); unlink(cs); unlink(ws);
	return rc;
}

/* Error-path twin of asm_byte_identical: both compilers must REJECT
 * the row and emit the same diagnostic bytes (an empty stderr is a
 * fail — a silent reject is not the rule-7 loud tail). */
static int
diag_byte_identical(const char *bin, const struct row *r, int i)
{
	char src[96], cs[96], ws[96], ce[96], we[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/ada_diag_%d_%d.ww", getpid(), i);
	snprintf(cs,  sizeof cs,  "/tmp/ada_diag_%d_%d_c.s", getpid(), i);
	snprintf(ws,  sizeof ws,  "/tmp/ada_diag_%d_%d_w.s", getpid(), i);
	snprintf(ce,  sizeof ce,  "/tmp/ada_diag_%d_%d_c.e", getpid(), i);
	snprintf(we,  sizeof we,  "/tmp/ada_diag_%d_%d_w.e", 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/w6c -o %s %s 2>%s", bin, cs, src, ce);
	if (runwait(cmd) == 0) {
		fprintf(stderr, "row[%s]: w6c accepted but must fail loud\n",
		    r->label);
		rc = -1;
	}
	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>%s",
	    bin, ws, src, we);
	if (rc == 0 && runwait(cmd) == 0) {
		fprintf(stderr, "row[%s]: w6c_ww accepted but must fail "
		    "loud\n", r->label);
		rc = -1;
	}
	if (rc == 0) {
		FILE *fe = fopen(ce, "rb");
		if (!fe || fgetc(fe) == EOF) {
			fprintf(stderr, "row[%s]: empty diagnostic\n",
			    r->label);
			rc = -1;
		}
		if (fe) fclose(fe);
	}
	if (rc == 0) {
		rc = slurp_eq(ce, we);
		if (rc != 0)
			fprintf(stderr, "row[%s]: cstage vs wwstage "
			    "diagnostic differs\n", r->label);
	}
	unlink(src); unlink(cs); unlink(ws); unlink(ce); unlink(we);
	return rc;
}

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;
	}

	char cdrv[2120], wdrv[2120];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);

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

	for (int i = 0; i < n; i++) {
		total++;
		if (run_driver(cdrv, &rows[i], i) != 0) fail++;
	}
	if (access(wdrv, X_OK) == 0) {
		for (int i = 0; i < n; i++) {
			total++;
			if (run_driver(wdrv, &rows[i], i) != 0) fail++;
		}
		for (int i = 0; i < n; i++) {
			total++;
			if (rows[i].mustfail) {
				if (diag_byte_identical(bin, &rows[i], i)
				    != 0) fail++;
				continue;
			}
			if (asm_byte_identical(bin, &rows[i], i) != 0) fail++;
		}
	}

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