/*
 * 989_wwdumpgate_run (#52, F15 c4) — wwdump_ww's `-c` and `-r` arms must gate
 * on parse-stage errors instead of silently emitting on a broken AST.
 *
 * THE BUG (wwstage wwdump_ww only, cat-A silent wrong output under rc=0): the
 * `-c` codegen arm ran checkfile+cgfile with NO parse-error gate — ps.errs
 * was never read — so a parse-errored decl was silently dropped from the AST
 * and the rest of the file compiled to asm with exit 0 (and `-c` IS the 994
 * byte-identity probe, so the gate tool itself could ship wrong asm silently).
 * The `-r` resolve report arm was likewise ungated. THE FIX: add the
 * `l.errs>0 || ps.errs>0` gate after parsefile in both arms, mirroring the
 * w6c compiler gate (selfhost/cmd/w6c/main.ww:162 / cmd/w6c/main.c).
 *
 * WWSTAGE-ONLY: the C wwdump (cstage) implements only -t/-a, not -c/-r — the
 * codegen/resolve dump arms are a wwstage-wwdump_ww feature, so there is no
 * cstage -c/-r twin to diff against; the gate reference is the w6c compiler.
 *
 *   row    | mode | input         | result
 *   -------+------+---------------+----------------------------------
 *   bad_c  | -c   | parse error   | rc != 0, zero asm bytes
 *   bad_r  | -r   | parse error   | rc != 0
 *   ok_c   | -c   | valid file    | rc == 0, asm emitted (control)
 *
 * bad_c / bad_r were RED pre-c4 (rc=0 with truncated asm / a resolve report).
 * ok_c pins the healthy emission path unperturbed.
 */
#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;
}

static const char *BAD =
	"package main;\n\n"
	"export fn main(argc: i32, argv: **u8) i32 = {\n\treturn 0;\n};\n\n"
	"fn broken( {\n";
static const char *OK =
	"package main;\nexport fn main() i32 = { return 0; };\n";

/* Run `<tool> <mode> <src>` capturing asm on stdout; returns rc, sets
 * *asmbytes to the stdout byte count when non-NULL. */
static int
run_dump(const char *tool, const char *mode, const char *src, long *asmbytes)
{
	char outp[128], cmd[1024];
	snprintf(outp, sizeof outp, "/tmp/wwdg_%d_out", getpid());
	snprintf(cmd, sizeof cmd, "%s %s %s > %s 2>/dev/null",
	    tool, mode, src, outp);
	int rc = runwait(cmd);
	if (asmbytes) {
		FILE *f = fopen(outp, "rb");
		long n = 0;
		if (f) { fseek(f, 0, SEEK_END); n = ftell(f); fclose(f); }
		*asmbytes = n;
	}
	unlink(outp);
	return rc;
}

static int
write_file(const char *path, const char *body)
{
	FILE *f = fopen(path, "wb");
	if (!f) return -1;
	fputs(body, f);
	fclose(f);
	return 0;
}

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 wtool[1024];
	snprintf(wtool, sizeof wtool, "%s/wwdump_ww", bin);
	if (access(wtool, X_OK) != 0) {
		/* wwdump_ww is the unit under test; absence is a wiring fault. */
		fprintf(stderr, "wwdumpgate: missing %s\n", wtool);
		return 1;
	}

	char badp[64], okp[64];
	snprintf(badp, sizeof badp, "/tmp/wwdg_bad_%d.ww", getpid());
	snprintf(okp, sizeof okp, "/tmp/wwdg_ok_%d.ww", getpid());
	if (write_file(badp, BAD) || write_file(okp, OK)) return 1;

	int fail = 0, total = 0;
	long ab;

	/* bad_c: loud, zero asm */
	total++;
	if (run_dump(wtool, "-c", badp, &ab) == 0 || ab != 0) {
		fprintf(stderr, "wwdumpgate[bad_c]: emitted asm with rc=0 on "
		    "parse-errored input (#52); asm=%ld\n", ab);
		fail++;
	}

	/* bad_r: loud */
	total++;
	if (run_dump(wtool, "-r", badp, NULL) == 0) {
		fprintf(stderr, "wwdumpgate[bad_r]: resolve report with rc=0 on "
		    "parse-errored input (#52)\n");
		fail++;
	}

	/* ok_c control: rc=0 with asm */
	total++;
	if (run_dump(wtool, "-c", okp, &ab) != 0 || ab <= 0) {
		fprintf(stderr, "wwdumpgate[ok_c]: healthy file rejected/no asm "
		    "(asm=%ld)\n", ab);
		fail++;
	}

	unlink(badp); unlink(okp);

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