/*
 * 989_trystr_run (#16) — the `?`/`!` unwrap of a str-success tagged union
 * must shuffle the str header (DX,CX,R8) → (AX,BX,CX) for ANY operand shape
 * and ANY variant order, keyed off the STAMPED operand type.
 *
 * THE BUG (wwstage only): cgtryprop/cgtryunw computed succisstr ONLY when the
 * operand was an N_CALL, via a name-keyed fnretlookupmod on the callee leaf,
 * and tested the FIRST variant (not the success variant). So an ident-source
 * unwrap (`let r = mk(); r!`) and an error-first union (`(e|str)`) both
 * dropped the `MOVQ CX,BX / MOVQ R8,CX` shuffle — the unwrapped str kept a
 * stale len/cap. cstage reads success_is_str = type_isstr(succ_t) at
 * cg_tagged_success_tag from the stamped operand type. THE FIX: read the
 * stamped operand's success-variant type via successvariant()+typeisstr().
 *
 *   row             | shape                                  | exit (cs==ww)
 *   ----------------+----------------------------------------+--------------
 *   ident_source    | let r=mk(); junk; r!  → s.len          | 2  (was ww 40)
 *   errfirst_call   | (e|str) mk2()!        → s.len          | 3
 *   succfirst_call  | (str|e) mk()!  (control)               | 4
 * A 40-byte `junk` str precedes the unwrap so a dropped shuffle leaks junk's
 * len into s.len: pre-fix ident_source ran ww=40 vs cs=2 (silent overrun).
 */
#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[] = {
	{ "ident_source",
	  "package main;\n"
	  "type e = !i32;\n"
	  "fn mk() (str | e) = { return \"hi\"; };\n"
	  "export fn main() i32 = {\n"
	  "	let r: (str | e) = mk();\n"
	  "	let junk: str = \"0123456789012345678901234567890123456789\";\n"
	  "	let s: str = r!;\n"
	  "	return s.len: i32;\n"
	  "};\n",
	  2 },

	{ "errfirst_call",
	  "package main;\n"
	  "type e = !i32;\n"
	  "fn mk2() (e | str) = { return \"abc\"; };\n"
	  "export fn main() i32 = {\n"
	  "	let junk: str = \"0123456789012345678901234567890123456789\";\n"
	  "	let s3: str = mk2()!;\n"
	  "	return s3.len: i32;\n"
	  "};\n",
	  3 },

	{ "succfirst_call",
	  "package main;\n"
	  "type e = !i32;\n"
	  "fn mk() (str | e) = { return \"wxyz\"; };\n"
	  "export fn main() i32 = {\n"
	  "	let junk: str = \"0123456789012345678901234567890123456789\";\n"
	  "	let s: str = mk()!;\n"
	  "	return s.len: i32;\n"
	  "};\n",
	  4 },
};

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/trystr_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/trystr_%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);
	int have_ww = (access(wdrv, X_OK) == 0);

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

	for (int i = 0; i < n; i++) {
		total++;
		int gc = run_build(cdrv, &rows[i], i);
		if (gc < 0) {
			fprintf(stderr, "trystr[cstage][%s]: build/run failed "
			    "(got %d)\n", rows[i].label, gc);
			fail++;
			continue;
		}
		if (gc != rows[i].want_exit) {
			fprintf(stderr, "trystr[cstage][%s]: exit=%d want=%d\n",
			    rows[i].label, gc, rows[i].want_exit);
			fail++;
		}
		if (!have_ww) {
			fprintf(stderr, "trystr: skip wwstage (no %s)\n", wdrv);
			continue;
		}
		int gw = run_build(wdrv, &rows[i], i);
		if (gw != gc) {
			fprintf(stderr, "trystr[%s]: cs=%d != ww=%d "
			    "(str-success unwrap shuffle dropped — #16)\n",
			    rows[i].label, gc, gw);
			fail++;
		}
		if (gw != rows[i].want_exit) {
			fprintf(stderr, "trystr[wwstage][%s]: exit=%d want=%d\n",
			    rows[i].label, gw, rows[i].want_exit);
			fail++;
		}
	}

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