/*
 * 944_alias_emit_b7_run — SLIM CARRIER (#5-C3 alias fold-2). The 8 K_RUN value
 * rows migrated to test/lang/alias_emit_b7_test.ww (@test, cs==ww byte-id); the
 * symmetric K_BUILDERR rejects (slcstr_plain_ctl, slcslc_2lvl) to
 * test/wcc/data/alias_{slcstr_plain,slcslc}/case.ww runww //ww:error.
 *
 * What survives here are the 4 IRREDUCIBLE per-stage rows neither in-language
 * surface can host (ken's emit_slice_data observation cells — load-bearing
 * codegen pins, MUST NOT move):
 *   • slc_2lvl / slc_plain_ctl (Group A): cstage builds+RUNS exit 0; wwstage
 *     LOUD-REJECTS at the let checker ("let: not assignable"). cstage emits the
 *     []my64b / []i64 slice-literal global DATA and runs; the ww checker
 *     rejects every slice-literal global (the #120/#29-kin acceptance
 *     divergence, ken-d2-oracle; pre-slim #66-R2/#29). @test needs ww to
 *     build, //ww:error needs cs to fail — neither fits.
 *   • slcstr_2lvl / slctag_2lvl (Group B): BOTH reject but with DIFFERENT
 *     diagnostics (cs at emit_slice_data 3-way "static-init unsupported"; ww at
 *     the let checker "not assignable") — a held cs!=ww divergence; the two
 *     messages ARE the pin, so each stage's own substring is asserted.
 */
#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;
}

static int
errlog_has(const char *path, const char *needle)
{
	FILE *f = fopen(path, "rb");
	if (!f) return 0;
	char buf[8192];
	size_t got = fread(buf, 1, sizeof buf - 1, f);
	fclose(f);
	buf[got] = '\0';
	return strstr(buf, needle) != NULL;
}

#define M_CSRUN_WWERR 0	/* cstage build+run exit 0; wwstage w6c_ww rejects wwerr */
#define M_BOTHERR     1	/* cstage w6c rejects cserr; wwstage w6c_ww rejects wwerr */

struct row { const char *label; const char *src; int mode;
             const char *cserr; const char *wwerr; };

static int
run_row(const char *bin, const struct row *r, int i)
{
	char dir[96], srcf[160], outbin[160], cse[160], wwe[160], ss[160],
	    rm[200], cmd[2048];
	snprintf(dir, sizeof dir, "/tmp/ab7_%d_%d", getpid(), i);
	mkdir(dir, 0755);
	snprintf(srcf, sizeof srcf, "%s/c.ww", dir);
	snprintf(outbin, sizeof outbin, "%s/bin", dir);
	snprintf(cse, sizeof cse, "%s/cs.err", dir);
	snprintf(wwe, sizeof wwe, "%s/ww.err", dir);
	snprintf(ss, sizeof ss, "%s/o.s", dir);
	snprintf(rm, sizeof rm, "rm -rf %s", dir);

	FILE *f = fopen(srcf, "wb");
	if (!f) { runwait(rm); return -1; }
	fputs(r->src, f);
	fclose(f);

	int ok = 1;
	if (r->mode == M_CSRUN_WWERR) {
		snprintf(cmd, sizeof cmd,
		    "timeout 20 %s/ww build -o %s %s >/dev/null 2>&1",
		    bin, outbin, srcf);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: cstage build failed (want run)\n",
			    r->label);
			ok = 0;
		} else if (runwait(outbin) != 0) {
			fprintf(stderr, "row[%s]: cstage run != 0\n", r->label);
			ok = 0;
		}
	} else {
		snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s 2>%s", bin, ss, srcf, cse);
		int crc = runwait(cmd);
		if (!(crc != 0 && errlog_has(cse, r->cserr))) {
			fprintf(stderr, "row[%s]: cstage expected reject \"%s\" (rc=%d)\n",
			    r->label, r->cserr, crc);
			ok = 0;
		}
	}
	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>%s", bin, ss, srcf, wwe);
	int wrc = runwait(cmd);
	if (!(wrc != 0 && errlog_has(wwe, r->wwerr))) {
		fprintf(stderr, "row[%s]: wwstage expected reject \"%s\" (rc=%d)\n",
		    r->label, r->wwerr, wrc);
		ok = 0;
	}
	runwait(rm);
	return ok ? 0 : 1;
}

static const struct row rows[] = {
	{ "slc_2lvl",
	  "package main;\n"
	  "type my64 = i64;\n"
	  "type my64b = my64;\n"
	  "let G: []my64b = [5, 6, 7];\n"
	  "export fn main() i32 = {\n"
	  "	if (G[0] + G[1] + G[2] != 18) { return 1; };\n"
	  "	if (len(G) != 3) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", M_CSRUN_WWERR, NULL, "let: not assignable" },
	{ "slc_plain_ctl",
	  "package main;\n"
	  "let G: []i64 = [5, 6, 7];\n"
	  "export fn main() i32 = {\n"
	  "	if (G[0] + G[1] + G[2] != 18) { return 1; };\n"
	  "	if (len(G) != 3) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", M_CSRUN_WWERR, NULL, "let: not assignable" },
	{ "slcstr_2lvl",
	  "package main;\n"
	  "type ms0 = str;\n"
	  "type ms = ms0;\n"
	  "let G: []ms = [\"aa\", \"bbb\"];\n"
	  "export fn main() i32 = {\n"
	  "	if (len(G[0]) != 2) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", M_BOTHERR,
	  "slice-of-{str,slice,tagged} literal static-init unsupported",
	  "let: not assignable" },
	{ "slctag_2lvl",
	  "package main;\n"
	  "type u0 = (void | i64);\n"
	  "type u1 = u0;\n"
	  "let G: []u1 = [1i64, 2i64];\n"
	  "export fn main() i32 = {\n"
	  "	if (len(G) != 2) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", M_BOTHERR,
	  "slice-of-{str,slice,tagged} literal static-init unsupported",
	  "let: not assignable" },
};

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[2080];
	if (bin[0] != '/') {
		char cwd[1024];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	int n = (int)(sizeof rows / sizeof rows[0]);
	int fail = 0;
	for (int i = 0; i < n; i++)
		if (run_row(bin, &rows[i], i) != 0) fail++;

	if (fail) {
		fprintf(stderr, "alias_emit_b7 (slim): %d/%d rows failed\n", fail, n);
		return 1;
	}
	printf("alias_emit_b7 (slim): %d/%d ok\n", n, n);
	return 0;
}