/*
 * 921_amp_def_global_run — address-of a module-level global (#149) +
 * scalar-def address-of (#147 consolidation). Regression net for the
 * cgaddr def-symbol / module-qualified gap: A.2 (0ed0b39) + A.3
 * (9e3bc4e) widened the VALUE-LOAD path for struct/array defs but the
 * ADDRESS-OF twin (cgexpr N_UN TK_AMP / cgun) never handled def-symbols
 * nor module-qualified globals, so `&def` / `&mod.global` emitted an
 * uninitialised AX (PUSHQ AX / POPQ DI / CALL — no LEAQ) → garbage
 * pointer, despite the DATA symbol existing. cs+ww were BYTE-IDENTICAL
 * on the bug (gate-blind), so each row carries BOTH dimensions:
 *   (a) `ww build` + run, asserting the exit code == the value reached
 *       THROUGH the pointer (a garbage pointer yields a wrong value, not
 *       a false exit-0 — the probe lesson).
 *   (b) w6c vs w6c_ww `.s` cmp — FAILS if the stages diverge (rule-10).
 *
 * Two operand shapes, one class (cgaddr-doesn't-handle-defs):
 *   Shape 1 `&G`        — N_IDENT, G a top-level def (struct/array/scalar)
 *   Shape 2 `&mod.G`    — N_DOT, mod a module qualifier (kind-agnostic:
 *                         cross-module let / def / scalar / fn)
 * The fold-4 / γ-cleanup driver is the cross-module struct-def row
 * (`&mod.def_struct`, the `&math::f64info` shape).
 *
 * Non-addressable defs (str def inlined; computed-rhs float like
 * `def NAN = 0.0/0.0` — #147, no DATA symbol) are NOT silently dropped:
 * `&them` is a LOUD build error in both stages (rule-7). Those rows set
 * want_build_fail.
 *
 * NOTE: array-element reads THROUGH a `*[N]T` pointer param have a
 * pre-existing cs!=ww divergence (narrow MOVSXD/MOVL + esz-stride),
 * unrelated to #149 — so the def-array row reads element 0 via a
 * `*[N]T -> *T` cast + plain deref, which isolates the `&A` LEAQ.
 *
 * Single-file multi-package form (like 953_f64crossmod_run): `package
 * myf; ... package main; import myf; ...` so w6c/w6c_ww see the cross-
 * module reference without -I plumbing.
 */
#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;
}

struct row {
	const char *label;
	const char *src;
	int want_exit;
	int want_build_fail;	/* 1: w6c must reject (loud rule-7 error) */
};

static const struct row rows[] = {
	/* Shape 1 — same-pkg `&def`. */
	{ "def_struct",
	  "package main;\n"
	  "type pt = struct { x: i32, y: i32 };\n"
	  "def P: pt = pt{x=7, y=11};\n"
	  "fn rd(p: *pt) i32 = { return p.x + p.y; };\n"
	  "export fn main() i32 = { return rd(&P); };\n", 18, 0 },
	{ "def_array",
	  "package main;\n"
	  "def A: [3]i64 = [18i64, 11i64, 0i64];\n"
	  "fn rd(p: *[3]i64) i64 = { let q: *i64 = p: *i64; return *q; };\n"
	  "export fn main() i32 = { return rd(&A): i32; };\n", 18, 0 },
	{ "def_scalar_int",
	  "package main;\n"
	  "def N: i32 = 42;\n"
	  "fn rd(p: *i32) i32 = { return *p; };\n"
	  "export fn main() i32 = { return rd(&N); };\n", 42, 0 },
	{ "def_scalar_float",
	  "package main;\n"
	  "def D: f64 = 0.5;\n"
	  "fn rd(p: *f64) f64 = { return *p; };\n"
	  "export fn main() i32 = { return (rd(&D) * 100.0): i32; };\n", 50, 0 },

	/* Shape 2 — cross-pkg `&mod.G` (kind-agnostic). */
	{ "xmod_def_struct",	/* the &math::f64info / fold-4 shape */
	  "package myf;\n"
	  "export type pt = struct { x: i32, y: i32 };\n"
	  "export def P: pt = pt{x=7, y=11};\n"
	  "package main;\n"
	  "import myf;\n"
	  "fn rd(p: *myf.pt) i32 = { return p.x + p.y; };\n"
	  "export fn main() i32 = { return rd(&myf.P); };\n", 18, 0 },
	{ "xmod_let_struct",
	  "package myf;\n"
	  "export type pt = struct { x: i32, y: i32 };\n"
	  "export let L: pt = pt{x=7, y=11};\n"
	  "package main;\n"
	  "import myf;\n"
	  "fn rd(p: *myf.pt) i32 = { return p.x + p.y; };\n"
	  "export fn main() i32 = { return rd(&myf.L); };\n", 18, 0 },
	{ "xmod_scalar_let",
	  "package myf;\n"
	  "export let S: i32 = 42;\n"
	  "package main;\n"
	  "import myf;\n"
	  "fn rd(p: *i32) i32 = { return *p; };\n"
	  "export fn main() i32 = { return rd(&myf.S); };\n", 42, 0 },
	{ "xmod_func",		/* Shape 2 TY_FN leaf → LEAQ fn(SB) */
	  "package myf;\n"
	  "export fn helper() i32 = { return 42; };\n"
	  "package main;\n"
	  "import myf;\n"
	  "fn take(p: *fn() i32) i32 = { return 7; };\n"
	  "export fn main() i32 = { return take(&myf.helper); };\n", 7, 0 },

	/* Regressions — paths the fix must NOT disturb. */
	{ "reg_let_struct",	/* &let_struct worked same-pkg pre-#149 */
	  "package main;\n"
	  "type pt = struct { x: i32, y: i32 };\n"
	  "let L: pt = pt{x=7, y=11};\n"
	  "fn rd(p: *pt) i32 = { return p.x + p.y; };\n"
	  "export fn main() i32 = { return rd(&L); };\n", 18, 0 },
	{ "reg_amp_arr_idx",	/* &local_arr[i] */
	  "package main;\n"
	  "fn rd(p: *i64) i64 = { return *p; };\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]i64 = [5i64, 18i64, 9i64];\n"
	  "	let p: *i64 = &a[1];\n"
	  "	return rd(p): i32; };\n", 18, 0 },

	/* rule-7 LOUD: `&non-addressable def` (no DATA symbol). */
	{ "fail_str_def",
	  "package main;\n"
	  "def MSG: str = \"hello\";\n"
	  "fn rd(p: *str) i32 = { return 7; };\n"
	  "export fn main() i32 = { return rd(&MSG); };\n", 0, 1 },
	{ "fail_computed_float",	/* #147 `def NAN = 0.0/0.0` shape */
	  "package main;\n"
	  "def D: f64 = 1.0 / 4.0;\n"
	  "fn rd(p: *f64) f64 = { return *p; };\n"
	  "export fn main() i32 = { return (rd(&D) * 100.0): i32; };\n", 0, 1 },

	{ NULL, NULL, 0, 0 }
};

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);
		int cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	return rc;
}

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 w6c[1100], w6c_ww[1100];
	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
	if (access(w6c_ww, X_OK) != 0) {
		fprintf(stderr, "amp_def_global: w6c_ww missing — cannot run the "
		    "cs==ww byte-id gate (the whole point of this test)\n");
		return 1;
	}

	int n = 0, fail = 0;
	for (int i = 0; rows[i].src; i++, n++) {
		char src[64];
		snprintf(src, sizeof src, "/tmp/wwamp_%d_%d.ww", getpid(), i);
		FILE *f = fopen(src, "wb");
		if (f == NULL) { fail++; continue; }
		fputs(rows[i].src, f);
		fclose(f);

		if (rows[i].want_build_fail) {
			/* rule-7 LOUD: both stages must REJECT (`&` of a non-
			 * addressable def has no DATA symbol). Build to .s and
			 * assert non-zero exit on each stage. */
			char cmd[2048], dump[64];
			snprintf(dump, sizeof dump, "/tmp/wwamp_%d_%d.s",
			    getpid(), i);
			snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
			    w6c, dump, src);
			if (runwait(cmd) == 0) {
				fprintf(stderr, "row[%s]: w6c ACCEPTED &non-"
				    "addressable-def (want loud reject)\n",
				    rows[i].label);
				fail++;
			}
			snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
			    w6c_ww, dump, src);
			if (runwait(cmd) == 0) {
				fprintf(stderr, "row[%s]: w6c_ww ACCEPTED &non-"
				    "addressable-def (want loud reject)\n",
				    rows[i].label);
				fail++;
			}
			unlink(src); unlink(dump);
			continue;
		}

		/* (a) cstage build + run; assert exit == value reached
		 * through the pointer. */
		char tmpdir[64];
		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwamp_%d_d_%d",
		    getpid(), i);
		mkdir(tmpdir, 0755);

		char cmd[2048];
		snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s",
		    tmpdir, bin, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: cstage build failed\n",
			    rows[i].label);
			fail++;
			unlink(src); rmdir(tmpdir);
			continue;
		}

		char outbin[128];
		const char *base = strrchr(src, '/');
		base = base ? base + 1 : src;
		snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
		char *dot = strrchr(outbin, '.');
		if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';

		int got = runwait(outbin);
		if (got != rows[i].want_exit) {
			fprintf(stderr, "row[%s]: cstage exit %d, want %d\n",
			    rows[i].label, got, rows[i].want_exit);
			fail++;
		}
		unlink(outbin); rmdir(tmpdir);

		/* (b) cs==ww byte-id gate. */
		char cs_s[64], ws_s[64];
		snprintf(cs_s, sizeof cs_s, "/tmp/wwamp_%d_%d_cs.s",
		    getpid(), i);
		snprintf(ws_s, sizeof ws_s, "/tmp/wwamp_%d_%d_ww.s",
		    getpid(), i);

		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", rows[i].label);
			fail++; unlink(src); continue;
		}
		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",
			    rows[i].label);
			fail++; unlink(src); unlink(cs_s); continue;
		}
		if (slurp_eq(cs_s, ws_s) != 0) {
			fprintf(stderr,
			    "row[%s]: cstage/wwstage .s DIFFER (rule-10 "
			    "byte-id violation)\n", rows[i].label);
			fail++;
		}
		unlink(src); unlink(cs_s); unlink(ws_s);
	}

	if (fail) {
		fprintf(stderr, "%d/%d amp-def-global tests failed\n", fail, n);
		return 1;
	}
	printf("amp_def_global: %d/%d ok (cstage run + cs==ww byte-id)\n",
	    n, n);
	return 0;
}