/*
 * 826_alias_tuple_coerce — residual asymmetric and assembly byte checks.
 * Symmetric runtime ownership is the r826_* compiler fixture set; the three
 * byte rows compile those exact files directly. Two negative controls remain
 * embedded because cstage must reject them while wwstage still over-accepts
 * them, so the symmetric fixture grammar cannot own that assertion.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.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 *path; };

static const struct row rows[] = {
	{ "init", "test/wcc/data/r826_alias_tuple_init/case.ww" },
	{ "fnarg", "test/wcc/data/r826_alias_tuple_fnarg/case.ww" },
	{ "ret", "test/wcc/data/r826_alias_tuple_ret/case.ww" },
};

static const char *neg[] = {
	"package main;\n"
	"type pair = (int, int);\n"
	"export fn main() i32 = {\n"
	"\tlet x: pair = (3, \"s\");\n"
	"\treturn x.0: i32;\n"
	"};\n",

	"package main;\n"
	"type pair = (int, int);\n"
	"export fn main() i32 = {\n"
	"\tlet x: pair = (3, 4, 5);\n"
	"\treturn x.0: i32;\n"
	"};\n",
};

static int
compile_should_fail(const char *compiler, const char *src, int i)
{
	char s[128], outasm[128], cmd[1024];
	snprintf(s, sizeof s, "/tmp/atc_neg_%d_%d.ww", getpid(), i);
	snprintf(outasm, sizeof outasm, "/tmp/atc_neg_%d_%d.s", getpid(), i);
	FILE *f = fopen(s, "wb");
	if (!f) return -1;
	fputs(src, f);
	fclose(f);
	snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
	    compiler, outasm, s);
	int rc = runwait(cmd);
	unlink(s);
	unlink(outasm);
	return rc == 0 ? -1 : 0;
}

static int
asm_byte_identical(const char *bin, const struct row *r, int i)
{
	char cs[64], ws[64], cmd[1024];
	snprintf(cs, sizeof cs, "/tmp/atc_asm_%d_%d_c.s", getpid(), i);
	snprintf(ws, sizeof ws, "/tmp/atc_asm_%d_%d_w.s", getpid(), i);
	snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s 2>/dev/null",
	    bin, cs, r->path);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: w6c errored\n", r->label);
		return -1;
	}
	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>/dev/null",
	    bin, ws, r->path);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: w6c_ww errored\n", r->label);
		unlink(cs);
		return -1;
	}
	FILE *fc = fopen(cs, "rb");
	FILE *fw = fopen(ws, "rb");
	int rc = 0;
	if (!fc || !fw) rc = -1;
	else {
		for (;;) {
			int a = fgetc(fc);
			int b = fgetc(fw);
			if (a != b) { rc = -1; break; }
			if (a == EOF) break;
		}
	}
	if (fc) fclose(fc);
	if (fw) fclose(fw);
	if (rc != 0)
		fprintf(stderr, "row[%s]: cstage vs wwstage asm differs\n",
		    r->label);
	unlink(cs);
	unlink(ws);
	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 cdrv[1024], wdrv[1024];
	snprintf(cdrv, sizeof cdrv, "%s/w6c", bin);
	snprintf(wdrv, sizeof wdrv, "%s/w6c_ww", bin);
	int n = (int)(sizeof rows / sizeof rows[0]);
	int nneg = (int)(sizeof neg / sizeof neg[0]);
	int total = 0, fail = 0;
	for (int i = 0; i < nneg; i++) {
		total++;
		if (compile_should_fail(cdrv, neg[i], i) != 0) {
			fprintf(stderr,
			    "alias_tuple_coerce[cstage][neg_%d]: built (should loud)\n",
			    i);
			fail++;
		}
	}
	if (access(wdrv, X_OK) == 0) {
		for (int i = 0; i < n; i++) {
			total++;
			if (asm_byte_identical(bin, &rows[i], i) != 0) fail++;
		}
	}
	if (fail) {
		fprintf(stderr,
		    "alias_tuple_coerce: %d/%d residual checks failed\n",
		    fail, total);
		return 1;
	}
	printf("alias_tuple_coerce: %d/%d residual checks ok\n", total, total);
	return 0;
}