/*
 * 815_fmt_int_run — #6 fmt.formattable widen (bare int / uint). Pins
 * that lib/fmt/fmt.ww now renders bare `int` and `uint` as REAL union
 * members (formattable = (i64|str|bool|rune|f64|int|uint), int=5,
 * uint=6 appended last). Before #6 cstage LOUD-rejected a bare int arg
 * to the fmt family (no `int` arm to widen into) while wwstage leniently
 * accepted via the #128 size/name-keyed int->i64 coercion — cs!=ww.
 * Making int/uint real members makes BOTH accept by membership; this
 * test is the cstage-now-accepts + correct-render + cs==ww byte-id gate.
 *
 *   row            | what it pins
 *   ---------------+--------------------------------------------------
 *   bare_int       | fprint(int 42) over the writeone path -> "42"
 *   bare_int_neg   | fprint(int -7) -> "-7" (signed i64dec path)
 *   bare_uint      | fprint(uint 42) -> "42"
 *   uint_highbit   | fprint(uint 2^63+1) -> "9223372036854775809"
 *                  | LOAD-BEARING: proves the strconv.u64tos UNSIGNED
 *                  | route (len 19, first byte '9' not '-') — i64dec
 *                  | would render this negative ("-9223372036854775807",
 *                  | len 20). Also proves wwstage tags it uint (6), not
 *                  | i64, under the widened union.
 *   int_printf     | bsprintf("{}", int 42) -> "42" (formatfield ->
 *                  | formatone -> formatraw placeholder path)
 *   unaffected_i64 | fprint(42i64) -> "42" (existing arm regression guard)
 *   unaffected_str | fprint("hi") -> "hi" (existing arm regression guard)
 *   mixed          | fprint(1:int, 2i64, true) -> "1 2 true": int(tag5)
 *                  | + i64(tag0) + bool(tag2) coexist in one call,
 *                  | distinct tags, ww auto-space separator.
 *
 * Each row builds + runs through BOTH `ww` (cstage) and `ww_ww`
 * (wwstage) via the driver (-I lib for the fmt import), then a byte-id
 * pass builds the combined.ww via the cstage driver and diffs the asm
 * w6c emits against w6c_ww — any cs!=ww tag/render divergence reds here.
 *
 * BOOTSTRAP-EMBED: fmt is NOT embedded in any selfhost combined.ww —
 * w6c/wwdump main.ww never reach wcc/err.ww (the lone `import fmt`), so
 * neither selfhost/cmd/{w6c,wwdump}/main.combined.ww carries an fmt fn
 * (grep-verified: 0 putbytes/writeone/formatraw; the 2 "formattable"
 * hits are cgen comment text). #6 therefore rides NO combined.ww regen.
 * This test covers the user-program path, which is the only fmt consumer.
 *
 * GATE POLARITY: must stay GREEN. A red means the int/uint arm dropped,
 * uint mis-routed through the signed renderer (highbit prints negative),
 * the wwstage mis-tagged uint as i64, or an existing i64/str arm
 * regressed.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <string.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[] = {
	{ "bare_int",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    let x: int = 42;\n"
	  "    match (fmt.fprint(vs, x)) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 2) { return 92; };\n"
	  "    if (v[0] != 52u8 || v[1] != 50u8) { return 93; };\n"
	  "    return 50;\n"
	  "};\n",
	  50 },
	{ "bare_int_neg",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    let x: int = -7;\n"
	  "    match (fmt.fprint(vs, x)) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 2) { return 92; };\n"
	  "    if (v[0] != 45u8 || v[1] != 55u8) { return 93; };\n"
	  "    return 51;\n"
	  "};\n",
	  51 },
	{ "bare_uint",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    let x: uint = 42u64: uint;\n"
	  "    match (fmt.fprint(vs, x)) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 2) { return 92; };\n"
	  "    if (v[0] != 52u8 || v[1] != 50u8) { return 93; };\n"
	  "    return 52;\n"
	  "};\n",
	  52 },
	{ "uint_highbit",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    let x: uint = 9223372036854775809u64: uint;\n"
	  "    match (fmt.fprint(vs, x)) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 19) { return 92; };\n"
	  "    if (v[0] != 57u8) { return 93; };\n"		/* '9', not '-' (45) */
	  "    if (v[18] != 57u8) { return 94; };\n"		/* trailing '9' */
	  "    return 53;\n"
	  "};\n",
	  53 },
	{ "int_printf",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [16]u8;\n"
	  "    let x: int = 42;\n"
	  "    let v: str = \"\";\n"
	  "    match (fmt.bsprintf(buf[0:16], \"{}\", x)) { case let s: str => { v = s; }; case io.error => { return 91; }; };\n"
	  "    if (v.len != 2) { return 92; };\n"
	  "    if (v[0] != 52u8 || v[1] != 50u8) { return 93; };\n"
	  "    return 54;\n"
	  "};\n",
	  54 },
	{ "unaffected_i64",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    match (fmt.fprint(vs, 42i64)) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 2) { return 92; };\n"
	  "    if (v[0] != 52u8 || v[1] != 50u8) { return 93; };\n"
	  "    return 55;\n"
	  "};\n",
	  55 },
	{ "unaffected_str",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    match (fmt.fprint(vs, \"hi\")) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 2) { return 92; };\n"
	  "    if (v[0] != 104u8 || v[1] != 105u8) { return 93; };\n"
	  "    return 56;\n"
	  "};\n",
	  56 },
	{ "mixed",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "import memio;\n"
	  "export fn main() i32 = {\n"
	  "    let buf: [32]u8;\n"
	  "    let st: memio.stream = memio.fixed(buf[0:32]);\n"
	  "    let vs: io.stream = &st.vt;\n"
	  "    let x: int = 1;\n"
	  "    match (fmt.fprint(vs, x, 2i64, true)) { case size => {}; case io.error => { return 91; }; };\n"
	  "    let v: str = memio.string(&st);\n"
	  "    if (v.len != 8) { return 92; };\n"			/* "1 2 true" */
	  "    if (v[0] != 49u8 || v[1] != 32u8) { return 93; };\n"	/* '1' ' ' */
	  "    if (v[2] != 50u8 || v[3] != 32u8) { return 94; };\n"	/* '2' ' ' */
	  "    if (v[4] != 116u8 || v[7] != 101u8) { return 95; };\n"	/* 't' .. 'e' */
	  "    return 57;\n"
	  "};\n",
	  57 },
};

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

/* Per-row tmpdir cleanup. ww_ww writes intermediates next to the source
 * (task #15), so each row's build leaves <src>.{combined.ww,s,o} + bare
 * exe alongside. Mirror of 781's. */
static void
cleanup_tmp(const char *tmpdir, const char *base)
{
	char p[640];
	snprintf(p, sizeof p, "%s/%s.ww", tmpdir, base); unlink(p);
	snprintf(p, sizeof p, "%s/%s.s",  tmpdir, base); unlink(p);
	snprintf(p, sizeof p, "%s/%s.o",  tmpdir, base); unlink(p);
	snprintf(p, sizeof p, "%s/%s.combined.ww", tmpdir, base); unlink(p);
	snprintf(p, sizeof p, "%s/%s",    tmpdir, base); unlink(p);
	rmdir(tmpdir);
}

static int
build_via_driver(const char *driver, const char *tmpdir, const char *cwd,
    const char *src)
{
	char cmd[2048];
	snprintf(cmd, sizeof cmd,
	    "cd %s && timeout 180 %s build -I %s/lib %s 2>/dev/null",
	    tmpdir, driver, cwd, src);
	return runwait(cmd);
}

static int
run_row(const char *driver, const char *cwd, const struct row *r, int seq)
{
	char tmpdir[256], src[512], base[64], outbin[768];
	snprintf(tmpdir, sizeof tmpdir, "/tmp/fic_%d_d_%d", getpid(), seq);
	snprintf(base,   sizeof base,   "main815");
	snprintf(src,    sizeof src,    "%s/%s.ww", tmpdir, base);
	mkdir(tmpdir, 0755);
	if (write_source(src, r->src) != 0) { cleanup_tmp(tmpdir, base); return -1; }
	int rc;
	int br = build_via_driver(driver, tmpdir, cwd, src);
	if (br == 0) {
		snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
		rc = runwait(outbin);
	} else {
		rc = -1;
	}
	cleanup_tmp(tmpdir, base);
	return rc;
}

/* asm_byte_identical — #94 sep layout: the cstage driver's --sep build
 * (which needs -I lib for fmt import resolution that raw w6c can't do)
 * emits per-package w6c asm to <stem>_c.sepwork/, and the wwstage driver's
 * --sep build emits per-package w6c_ww asm to <stem>_w.sepwork/. Concat
 * (sorted glob, identical package set) and diff — proves no cs!=ww
 * tag/render divergence on the widened union. */
static int
asm_byte_identical(const char *cdrv, const char *wdrv, const char *cwd,
    const struct row *r, int seq)
{
	char tmpdir[256], base[64], src[512], cs[640], ws[640];
	char cmd[2048];
	snprintf(tmpdir, sizeof tmpdir, "/tmp/fic_%d_b_%d", getpid(), seq);
	snprintf(base, sizeof base, "main815b");
	snprintf(src, sizeof src, "%s/%s.ww", tmpdir, base);
	snprintf(cs, sizeof cs, "%s/all_cs.s", tmpdir);
	snprintf(ws, sizeof ws, "%s/all_ww.s", tmpdir);
	mkdir(tmpdir, 0755);
	if (write_source(src, r->src) != 0) {
		snprintf(cmd, sizeof cmd, "rm -rf %s", tmpdir);
		if (system(cmd)) {}
		return -1;
	}

	int rc = 0;
	snprintf(cmd, sizeof cmd,
	    "cd %s && WW_PKGCACHE=%s/pkgc_c timeout 180 %s build --sep -I %s/lib "
	    "-o %s/%s_c %s 2>/dev/null", tmpdir, tmpdir, cdrv, cwd, tmpdir, base, src);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "fmt_int_run[byteid][%s]: cstage sep build failed\n",
		    r->label);
		rc = -1;
	}
	if (rc == 0) {
		snprintf(cmd, sizeof cmd,
		    "cd %s && WW_PKGCACHE=%s/pkgc_w timeout 180 %s build --sep "
		    "-I %s/lib -o %s/%s_w %s 2>/dev/null",
		    tmpdir, tmpdir, wdrv, cwd, tmpdir, base, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "fmt_int_run[byteid][%s]: wwstage sep build "
			    "failed\n", r->label);
			rc = -1;
		}
	}
	if (rc == 0) {
		snprintf(cmd, sizeof cmd, "cat %s/%s_c.sepwork/*.s > %s 2>/dev/null",
		    tmpdir, base, cs); if (system(cmd)) {}
		snprintf(cmd, sizeof cmd, "cat %s/%s_w.sepwork/*.s > %s 2>/dev/null",
		    tmpdir, base, ws); if (system(cmd)) {}
		FILE *fc = fopen(cs, "rb");
		FILE *fw = fopen(ws, "rb");
		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,
			    "fmt_int_run[byteid][%s]: cstage vs wwstage asm differs\n",
			    r->label);
	}

	snprintf(cmd, sizeof cmd, "rm -rf %s", tmpdir);
	if (system(cmd)) {}
	return rc;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char cwd[256];
	if (getcwd(cwd, sizeof cwd) == NULL) return 1;
	char absbin[512];
	if (bin[0] != '/') {
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	char cdrv[640], wdrv[640];
	snprintf(cdrv, sizeof cdrv, "%s/ww",    bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);

	int n = (int)(sizeof rows / sizeof rows[0]);
	int total = 0, fail = 0;
	int wwpresent = (access(wdrv, X_OK) == 0);
	int seq = 0;

	for (int i = 0; i < n; i++) {
		total++;
		int got = run_row(cdrv, cwd, &rows[i], seq++);
		if (got != rows[i].want_exit) {
			fprintf(stderr, "fmt_int_run[cs][%s]: exit=%d want=%d\n",
			    rows[i].label, got, rows[i].want_exit);
			fail++;
		}
		if (wwpresent) {
			total++;
			int gw = run_row(wdrv, cwd, &rows[i], seq++);
			if (gw != rows[i].want_exit) {
				fprintf(stderr, "fmt_int_run[ww][%s]: exit=%d want=%d\n",
				    rows[i].label, gw, rows[i].want_exit);
				fail++;
			}
		}
	}

	if (wwpresent) {
		for (int i = 0; i < n; i++) {
			total++;
			if (asm_byte_identical(cdrv, wdrv, cwd, &rows[i], seq++) != 0)
				fail++;
		}
	} else {
		fprintf(stderr, "fmt_int_run: skip wwstage (no %s)\n", wdrv);
	}

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