/*
 * 989_globstrslice_run — F8-c2 (report-item #47): a module-GLOBAL str
 * sliced with a DEFAULT high bound and passed as a call arg (`take(g[1:])`)
 * must load its length word for the hi — both stages, byte-identical.
 *
 * THE BUG (cat-A silent miscompile, align-UP): in cgenutil.ww the N_SLICE
 * call-arg pusharg builds {cap,len,ptr} on the stack. For a DEFAULT hi
 * (`g[lo:]`) it picks the base length per base kind. The global-base branch
 * handled N_TARRAY and N_TSLICE but had NO arm for a global str (N_TNAME
 * "str"), so AX kept the base pointer (loaded for the base push) and got
 * PUSHQ'd as the hi → len = ptr - lo, garbage. The LOCAL-str arm and the
 * alias-NAMED (bu60) arm already loaded the +8 length word; only the plain
 * global-str arm was missing. cstage pushargs reads the base type via
 * type_chase_named uniformly (cmd/w6c/cgen.c N_SLICE), so it loaded the len
 * and ran correct — the cat-A divergence (990-997 never slice a global str
 * arg with a default hi, so they stayed green).
 *
 * THE FIX: the global default-hi branch grows an N_TNAME "str" arm emitting
 * the same `LEAQ g(SB),CX; MOVQ 8(CX),AX` as the global N_TSLICE arm (str IS
 * []u8 — the len word sits at +8). align ww UP; the .s is byte-identical.
 *
 * Rows (build+run on cstage `ww` and wwstage `ww_ww`; rule-10 — agree+hit):
 *   row             | shape                         | want
 *   ----------------+-------------------------------+-----
 *   gstr_defhi      | slen(g[1:])  g="hello"        | 4 [#47 bug — len ptr-lo]
 *   gstr_defhi_full | slen(g[0:])  lo=0 default hi  | 5 [#47 bug]
 *   gstr_defhi_ptr  | sfirst(g[1:])  s[0]=='e'      | 101 [ptr word still ok]
 *   gstr_explicit   | slen(g[1:3])  hi explicit     | 2 (control: hi!=nil path
 *                   |                                | must not regress)
 */
#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;
};

#define PRELUDE \
	"package main;\n" \
	"let g: str = \"hello\";\n" \
	"fn slen(s: str) int = { return len(s): int; };\n" \
	"fn sfirst(s: str) int = { return s[0]: int; };\n"

static const struct row rows[] = {
	{ "gstr_defhi",
	  PRELUDE
	  "export fn main() int = { return slen(g[1:]); };\n",
	  4 },

	{ "gstr_defhi_full",
	  PRELUDE
	  "export fn main() int = { return slen(g[0:]); };\n",
	  5 },

	{ "gstr_defhi_ptr",
	  PRELUDE
	  "export fn main() int = { return sfirst(g[1:]); };\n",
	  101 },

	{ "gstr_explicit",
	  PRELUDE
	  "export fn main() int = { return slen(g[1:3]); };\n",
	  2 },
};

/* run_build — build+run `src` via `driver`; returns the binary's exit
 * code, or -1 on a build failure. */
static int
run_build(const char *driver, const struct row *r, int i)
{
	char src[64], tmpdir[64], cmd[1024];
	snprintf(src, sizeof src, "/tmp/gss_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/gss_%d_d_%d", getpid(), i);

	FILE *f = fopen(src, "wb");
	if (!f) return -2;
	fputs(r->src, f);
	fclose(f);

	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null",
	    tmpdir, driver, src);
	int brc = runwait(cmd);

	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 = -1;
	if (brc == 0) got = runwait(outbin);

	unlink(src); unlink(outbin); rmdir(tmpdir);
	return brc == 0 ? got : -1;
}

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);

	struct { const char *name; const char *drv; 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].drv, X_OK) != 0) {
			fprintf(stderr, "globstrslice_run: skip %s (no %s)\n",
			    drivers[d].name, drivers[d].drv);
			continue;
		}
		for (int i = 0; i < n; i++) {
			total++;
			int got = run_build(drivers[d].drv, &rows[i], i);
			if (got != rows[i].want_exit) {
				fprintf(stderr, "globstrslice_run[%s][%s]: exit=%d "
				    "want=%d\n", drivers[d].name, rows[i].label,
				    got, rows[i].want_exit);
				fail++;
			}
		}
	}

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