/*
 * 989_allocalias_run (#26) — `alloc(T{...})` where T is an alias of a struct
 * must size + field-fill from the resolved (alias-chased) struct layout.
 *
 * THE BUG (wwstage only): cgalloc looked up the struct layout by the literal
 * head NAME via structlookup, which scans c.structs by name and never matches
 * an alias. For `type pt = point; alloc(pt{x=1,y=2})` it found nil, kept the
 * default size 8 (under-alloc for the 16B struct) and skipped the whole
 * field-store loop — the *pt pointed at uninitialised heap (rc=0, p.x wrong).
 * cstage sizes from type_default(v->type) and walks u->fields. THE FIX: chase
 * the alias chain with structlookupchain on the literal's type ref.
 *
 *   row          | shape                              | exit (cs==ww)
 *   -------------+------------------------------------+--------------
 *   alias        | type pt=point; alloc(pt{x=1,y=2})  | 0  (was ww 1)
 *   direct ctrl  | alloc(point{x=1,y=2})              | 0
 * alias returns p.x*0+ok: pre-fix ww exited 1 (p.x != 1, zero-filled heap).
 */
#include <stdio.h>
#include <stdlib.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[] = {
	{ "alias",
	  "package main;\n"
	  "import rt;\n"
	  "type point = struct { x: i64, y: i64 };\n"
	  "type pt = point;\n"
	  "export fn main() i32 = {\n"
	  "	let p: *pt = alloc(pt{x=1,y=2})!;\n"
	  "	if (p.x != 1) { return 1; };\n"
	  "	if (p.y != 2) { return 2; };\n"
	  "	return 0;\n"
	  "};\n",
	  0 },

	{ "direct",
	  "package main;\n"
	  "import rt;\n"
	  "type point = struct { x: i64, y: i64 };\n"
	  "export fn main() i32 = {\n"
	  "	let p: *point = alloc(point{x=1,y=2})!;\n"
	  "	if (p.x != 1) { return 1; };\n"
	  "	if (p.y != 2) { return 2; };\n"
	  "	return 0;\n"
	  "};\n",
	  0 },
};

static int
run_build(const char *driver, const struct row *r, int i)
{
	char tmpdir[64], src[128], outbin[128], rmcmd[160], cmd[1024];
	snprintf(tmpdir, sizeof tmpdir, "/tmp/alal_%d_d_%d", getpid(), i);
	mkdir(tmpdir, 0755);
	snprintf(src, sizeof src, "%s/alal_%d_%d.ww", tmpdir, getpid(), i);
	snprintf(outbin, sizeof outbin, "%s/alal_%d_%d", tmpdir, getpid(), i);
	snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpdir);

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

	snprintf(cmd, sizeof cmd, "%s build -o %s %s 2>/dev/null",
	    driver, outbin, src);
	int brc = runwait(cmd);

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

	runwait(rmcmd);
	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, "allocalias[cstage][%s]: build/run failed "
			    "(got %d)\n", rows[i].label, gc);
			fail++;
			continue;
		}
		if (gc != rows[i].want_exit) {
			fprintf(stderr, "allocalias[cstage][%s]: exit=%d want=%d\n",
			    rows[i].label, gc, rows[i].want_exit);
			fail++;
		}
		if (!have_ww) {
			fprintf(stderr, "allocalias: skip wwstage (no %s)\n", wdrv);
			continue;
		}
		int gw = run_build(wdrv, &rows[i], i);
		if (gw != gc) {
			fprintf(stderr, "allocalias[%s]: cs=%d != ww=%d "
			    "(alloc(alias{}) under-alloc / zero fields — #26)\n",
			    rows[i].label, gc, gw);
			fail++;
		}
		if (gw != rows[i].want_exit) {
			fprintf(stderr, "allocalias[wwstage][%s]: exit=%d want=%d\n",
			    rows[i].label, gw, rows[i].want_exit);
			fail++;
		}
	}

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