/*
 * 689_arrglob_nodup_run (#12) — a no-init module-level array global emits
 * its zero-fill DATAW row EXACTLY ONCE, and cstage / wwstage agree
 * byte-for-byte.
 *
 * THE BUG (wwstage only): emitletdataw's str-payload zero-fallback arm is
 * SIZE-keyed (`sz == size(str)` == 24), not type-keyed. A no-init array
 * global whose bytes sum to 24 (e.g. `let g: [3]u64;`) matched that arm AND
 * the dedicated TY_ARRAY arm below → two identical `DATAW main.g` rows.
 * cstage discriminates on the declared type kind (let_isstr) and emits one.
 * Runtime reads the null bytes correctly either way (the linker keeps one
 * symbol), so the divergence is byte-id-visible only — the asm-byte-id check
 * is the real discriminator; the row-count + run rows pin absolute correctness.
 *
 * THE FIX: exclude arrays from the str-size arm (`&& !isarr8`), mirroring the
 * isarr8 guard already on the sz==8 scalar arm. The emitarraydata path owns
 * array globals.
 *
 *   check              | shape                       | want
 *   -------------------+-----------------------------+--------------
 *   run                | g[0]+g[1]+g[2], = 1+2+3     | 6
 *   dataw_rows (ww)    | count of `DATAW main.g` rows | 1
 *   asm_byte_identical | w6c vs w6c_ww .s             | identical
 * Pre-fix: ww emitted 2 `DATAW main.g` rows; cs vs ww .s differed.
 */
#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 const char *SRC =
	"package main;\n"
	"let g: [3]u64;\n"
	"export fn main() i32 = {\n"
	"	g[0] = 1; g[1] = 2; g[2] = 3;\n"
	"	return (g[0] + g[1] + g[2]): i32;\n"
	"};\n";

static int
run_driver(const char *driver)
{
	char src[64], tmpdir[64], cmd[1024];
	snprintf(src, sizeof src, "/tmp/agnd_%d.ww", getpid());
	snprintf(tmpdir, sizeof tmpdir, "/tmp/agnd_%d_d", getpid());

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

	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null",
	    tmpdir, driver, src);
	if (runwait(cmd) != 0) { unlink(src); rmdir(tmpdir); return -1; }

	const char *base = strrchr(src, '/');
	base = base ? base + 1 : src;
	char outbin[128];
	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); rmdir(tmpdir);
	return got;
}

/* emit .s via `tool`, return the count of `DATAW main.g(SB)` rows, or -1. */
static int
dataw_rows(const char *bin, const char *tool)
{
	char src[64], asmf[80], cmd[1024];
	snprintf(src,  sizeof src,  "/tmp/agnd_asm_%d.ww", getpid());
	snprintf(asmf, sizeof asmf, "/tmp/agnd_asm_%d_%s.s", getpid(), tool);

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

	snprintf(cmd, sizeof cmd, "%s/%s -o %s %s 2>/dev/null", bin, tool, asmf, src);
	if (runwait(cmd) != 0) { unlink(src); return -1; }

	FILE *a = fopen(asmf, "rb");
	int n = 0;
	if (a) {
		char line[512];
		while (fgets(line, sizeof line, a))
			if (strncmp(line, "DATAW main.g(SB)", 16) == 0) n++;
		fclose(a);
	} else {
		n = -1;
	}
	unlink(src); unlink(asmf);
	return n;
}

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 cdrv[1024], wdrv[1024];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);
	int have_ww = (access(wdrv, X_OK) == 0);

	int fail = 0, total = 0;

	/* run correctness, both drivers */
	total++;
	if (run_driver(cdrv) != 6) {
		fprintf(stderr, "arrglob_nodup[cstage]: run != 6\n"); fail++;
	}
	if (have_ww) {
		total++;
		if (run_driver(wdrv) != 6) {
			fprintf(stderr, "arrglob_nodup[wwstage]: run != 6\n"); fail++;
		}
	}

	/* exactly one DATAW row per stage */
	total++;
	if (dataw_rows(bin, "w6c") != 1) {
		fprintf(stderr, "arrglob_nodup[w6c]: DATAW main.g rows != 1\n"); fail++;
	}
	if (access(wdrv, X_OK) == 0) {
		total++;
		int r = dataw_rows(bin, "w6c_ww");
		if (r != 1) {
			fprintf(stderr, "arrglob_nodup[w6c_ww]: DATAW main.g rows = %d "
			    "(want 1 — double-emit #12)\n", r);
			fail++;
		}
	}

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