/*
 * 917_def_float_lit_run — runtime + byte-id net for #129 Phase A.1:
 * module-level `def NAME: f64 = literal;` (and `def: f32 = …`)
 * silently fell through emit_defs's int-only `fold_int_literal` gate,
 * so no DATAW row landed in the .data section — `w6l` failed link
 * with `undefined reference to 'main.NAME'`. Symmetric latent bug in
 * emit_lets's float arm: it only handled bare N_FLOATLIT, never
 * peeled N_UN(MINUS/PLUS, N_FLOATLIT), so `let g: f64 = -1.5;`
 * silently zero-emitted into the same undef-ref shape.
 *
 * Phase A.1 fix (rule-12 sea-of-stars consolidation):
 *   - cstage: extract `emit_floatlit_data(out, c, dir, name, T, rhs)`
 *     helper, called by emit_lets's float arm (now collapsed) AND
 *     emit_defs (new float arm). N_CAST + N_UN(MINUS/PLUS,
 *     N_FLOATLIT) peeled inside the helper.
 *   - wwstage: parallel `emitfloatlitdata` helper. Negation via
 *     IEEE-754 sign-bit XOR (avoids dragging the math bitcast helpers
 *     into cgen).
 *   - LOAD side: cstage's N_IDENT float-let arm and wwstage's cgident
 *     def-branch both gated on let_islet/deflookup-but-not-float; the
 *     gate widens to also catch float defs (they emit through the
 *     same mod_mangle / emitsymname symbol).
 *
 * Bootstrap NEUTRAL: zero current `def: f{32,64} = lit` consumers in
 * lib/ or selfhost/. The N_UN-peel collateral fix for lets has no
 * shipped consumers either (audit: no `let g: f64 = -lit;` anywhere).
 *
 * Rows cover both fix sides (DATA emit + LOAD) and the N_UN collateral:
 *   - f64_def_pos: `def K: f64 = 1.5;` — was undef-ref pre-fix, exit
 *     1 (1.5 → i32 truncates to 1).
 *   - f64_def_neg: `def K: f64 = -1.5;` — was undef-ref pre-fix; exit
 *     255 (sign-bit flip via XOR; -1.5 → i32 truncates to -1 → 255
 *     in unsigned exit byte).
 *   - f32_def_pos: `def K: f32 = 1.5f32; …` — same shape, f32 width.
 *   - f64_let_neg: `let g: f64 = -1.5;` — pre-existing latent bug
 *     (N_UN peel never added to emit_lets); now fixed by the same
 *     helper.
 *   - f64_let_pos: `let g: f64 = 1.5;` — regression guard (existing
 *     bare-N_FLOATLIT path).
 *   - f32_let_pos: `let g: f32 = 1.5f32;` — regression guard, f32 path.
 *
 * Each row carries (a) cstage `ww build` + run asserting exit code
 * and (b) w6c vs w6c_ww `.s` cmp (rule-10 byte-id).
 */
#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; };

static const struct row rows[] = {
	{ "f64_def_pos",
	  "package main;\n"
	  "def K: f64 = 1.5;\n"
	  "export fn main() i32 = {\n"
	  "	let x: f64 = K;\n"
	  "	return (x: i32);\n"
	  "};\n", 1 },
	{ "f64_def_neg",
	  "package main;\n"
	  "def K: f64 = -1.5;\n"
	  "export fn main() i32 = {\n"
	  "	let x: f64 = K;\n"
	  "	return (x: i32);\n"
	  "};\n", 255 /* -1 as unsigned exit byte */ },
	{ "f32_def_pos",
	  "package main;\n"
	  "def K: f32 = 1.5f32;\n"
	  "export fn main() i32 = {\n"
	  "	let x: f32 = K;\n"
	  "	return (x: i32);\n"
	  "};\n", 1 },
	/* Matrix-closure: f32 + neg combined directly. Exercises the
	 * f32-narrow path PLUS the top-byte-XOR negation in one row.
	 * The other rows cover each leg individually (f64_def_neg for
	 * negation, f32_def_pos for f32 narrow); this row pins they
	 * compose correctly. */
	{ "f32_def_neg",
	  "package main;\n"
	  "def K: f32 = -1.5f32;\n"
	  "export fn main() i32 = {\n"
	  "	let x: f32 = K;\n"
	  "	return (x: i32);\n"
	  "};\n", 255 /* -1 as exit byte */ },
	/* Pre-existing latent: emit_lets's float arm never peeled
	 * N_UN(MINUS,N_FLOATLIT). The class-closure consolidation
	 * fix in emit_floatlit_data heals this too. */
	{ "f64_let_neg",
	  "package main;\n"
	  "let g: f64 = -1.5;\n"
	  "export fn main() i32 = {\n"
	  "	return (g: i32);\n"
	  "};\n", 255 },
	{ "f64_let_pos",
	  "package main;\n"
	  "let g: f64 = 1.5;\n"
	  "export fn main() i32 = {\n"
	  "	return (g: i32);\n"
	  "};\n", 1 },
	{ "f32_let_pos",
	  "package main;\n"
	  "let g: f32 = 1.5f32;\n"
	  "export fn main() i32 = {\n"
	  "	return (g: i32);\n"
	  "};\n", 1 },
	{ NULL, NULL, 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, "deflitf: 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/wwdflf_%d_%d.ww", getpid(), i);
		FILE *f = fopen(src, "wb");
		if (f == NULL) { fail++; continue; }
		fputs(rows[i].src, f);
		fclose(f);

		char tmpdir[64];
		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwdflf_%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);

		char cs_s[64], ws_s[64];
		snprintf(cs_s, sizeof cs_s, "/tmp/wwdflf_%d_%d_cs.s",
		    getpid(), i);
		snprintf(ws_s, sizeof ws_s, "/tmp/wwdflf_%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 def-float-lit tests failed\n", fail, n);
		return 1;
	}
	printf("deflitf: %d/%d ok (cstage run + cs==ww byte-id)\n",
	    n, n);
	return 0;
}