/*
 * 780_fmt_mods_run — io fold-2 (#5) commit-2 sentinel. Pins the
 * modifier-formatting machinery (rawleni64 / rawlenstr / rawlenf64 /
 * rawlen / formatraw / formatone) in lib/fmt/fmt.ww: formatfield takes
 * `*mods` and routes through formatone so the {:mods} placeholder
 * honours width / alignment / pad / sign / base / prec. #5 graduated
 * fprintf's sink io.stream -> io.handle; these rows drive it over the
 * FILE arm (`fd: io.file` widens to io.handle).
 *
 * Each row imports fmt + os + io, opens a per-process /tmp output file,
 * calls fprintf with a {:mods} format string + one arg, and asserts the
 * exact byte content read back.
 *
 * Cstage-only per row. #209 (the wwstage checker bail on fmt's
 * spread-union match-arms) is now CLOSED; the residual blocker is the
 * pre-existing cgen cluster #226 (io.read error-remap nominal-identity)
 * + #227 (spread-union widen/return-ABI). Identical carve-out to
 * 777_fmt_handle_run (cited there). Byte-id graduates when #226 (+#227)
 * land.
 *
 *   row              | format     | arg          | expect    | exit
 *   -----------------+------------+--------------+-----------+-----
 *   width            | "{:5}"     | 42i64        | "   42"   | 50
 *   precision        | "{:.3}"    | "hello"      | "hel"     | 51
 *   base_hex         | "{:x}"     | 255i64       | "ff"      | 52
 *   sign_plus        | "{:+}"     | 7i64         | "+7"      | 53
 *   zero_pad         | "{:_05}"   | 42i64        | "00042"   | 54
 *
 * Modifier surface exercised (subset of scanmods at fmt.ww):
 *
 *   width    digits 1..9 — RIGHT-align pad to N chars
 *   prec     '.' + digits — str truncation / int min-digits
 *   base     'x' — strconv.base.HEX_LOWER
 *   neg      '+' — emit '+' on non-negative
 *   pad      '_<rune>' — pad rune override (default space when ':')
 *
 * Drew NaN/Inf signoff (carry from task #58): f64 arm not exercised
 * here (rows pin i64+str+bool fastpaths); follow-on fold can add f64
 * once Drew's strconv.f64tos shortest-G stays static.
 *
 * IMPORT-ORDER WORKAROUND (sibling task #208, pre-existing): every row
 * places `import os;` FIRST for the same reason 776/777 document
 * (wwstage checker ordering-sensitivity on os.tryread/trywrite/
 * tryopen's bare `return r;` over a tagged return type).
 *
 * DEFERRALS / RELATED (NOT addressed by these rows):
 *
 *   - #226 (io.read error-remap nominal-identity) + #227 (spread-union
 *     widen/return-ABI): block STAGE_WW here, same as 777_fmt_handle_run.
 *     #209 (the checker bail) is closed; these cgen folds are the
 *     residual. Cstage-only until they land.
 *
 * BOOTSTRAP-EMBED CHECK: fmt is NOT embedded in any selfhost
 * combined.ww (grep confirmed), so the #5 fmt graduation does NOT
 * require a Makefile regen (#110); only test paths see the machinery.
 * 990-997 byte-id gates stay green by virtue of fmt being test-only on
 * the bootstrap surface.
 *
 * GATE POLARITY: must stay GREEN. A red here means formatone /
 * formatraw / rawlen miscomputed bytes, formatfield regressed its
 * *mods route, scanmods/modsinit drifted, or the strconv.u64tos base
 * path miscompiled under fprintf over the io.handle file arm.
 */
#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;
}

#define STAGE_CS	1
#define STAGE_WW	2

struct row {
	const char *label;
	const char *src;
	int want_exit;
	int stage_mask;
	int byte_id;
};

static const struct row rows[] = {
	{ "width",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "export fn main() i32 = {\n"
	  "    let path: str = \"/tmp/wwfmtm_780_a\";\n"
	  "    let fd: i32 = os.open(path, os.flag.RDWR | os.flag.CREATE | os.flag.TRUNC, 0o644: i32);\n"
	  "    if (fd < 0) { return 90; };\n"
	  "    let wr = fmt.fprintf(fd: io.file, \"{:5}\", 42i64);\n"
	  "    let nw: size = 0;\n"
	  "    match (wr) {\n"
	  "    case let n: size => { nw = n; };\n"
	  "    case io.error => { return 91; };\n"
	  "    };\n"
	  "    os.close(fd);\n"
	  "    let rd: i32 = os.open(path, os.flag.RDONLY, 0i32);\n"
	  "    if (rd < 0) { return 92; };\n"
	  "    let buf: [16]u8;\n"
	  "    let n: i64 = os.read(rd, &buf[0], 16u64);\n"
	  "    os.close(rd);\n"
	  "    if (n != 5i64) { return 93; };\n"
	  "    if (nw != 5: size) { return 94; };\n"
	  "    if (buf[0] != 32u8 || buf[1] != 32u8 || buf[2] != 32u8 || buf[3] != 52u8 || buf[4] != 50u8) { return 95; };\n"
	  "    return 50;\n"
	  "};\n",
	  50,
	  STAGE_CS | STAGE_WW, 1 },
	{ "precision",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "export fn main() i32 = {\n"
	  "    let path: str = \"/tmp/wwfmtm_780_b\";\n"
	  "    let fd: i32 = os.open(path, os.flag.RDWR | os.flag.CREATE | os.flag.TRUNC, 0o644: i32);\n"
	  "    if (fd < 0) { return 90; };\n"
	  "    let wr = fmt.fprintf(fd: io.file, \"{:.3}\", \"hello\");\n"
	  "    let nw: size = 0;\n"
	  "    match (wr) {\n"
	  "    case let n: size => { nw = n; };\n"
	  "    case io.error => { return 91; };\n"
	  "    };\n"
	  "    os.close(fd);\n"
	  "    let rd: i32 = os.open(path, os.flag.RDONLY, 0i32);\n"
	  "    if (rd < 0) { return 92; };\n"
	  "    let buf: [16]u8;\n"
	  "    let n: i64 = os.read(rd, &buf[0], 16u64);\n"
	  "    os.close(rd);\n"
	  "    if (n != 3i64) { return 93; };\n"
	  "    if (nw != 3: size) { return 94; };\n"
	  "    if (buf[0] != 104u8 || buf[1] != 101u8 || buf[2] != 108u8) { return 95; };\n"
	  "    return 51;\n"
	  "};\n",
	  51,
	  STAGE_CS | STAGE_WW, 1 },
	{ "base_hex",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "export fn main() i32 = {\n"
	  "    let path: str = \"/tmp/wwfmtm_780_c\";\n"
	  "    let fd: i32 = os.open(path, os.flag.RDWR | os.flag.CREATE | os.flag.TRUNC, 0o644: i32);\n"
	  "    if (fd < 0) { return 90; };\n"
	  "    let wr = fmt.fprintf(fd: io.file, \"{:x}\", 255i64);\n"
	  "    let nw: size = 0;\n"
	  "    match (wr) {\n"
	  "    case let n: size => { nw = n; };\n"
	  "    case io.error => { return 91; };\n"
	  "    };\n"
	  "    os.close(fd);\n"
	  "    let rd: i32 = os.open(path, os.flag.RDONLY, 0i32);\n"
	  "    if (rd < 0) { return 92; };\n"
	  "    let buf: [16]u8;\n"
	  "    let n: i64 = os.read(rd, &buf[0], 16u64);\n"
	  "    os.close(rd);\n"
	  "    if (n != 2i64) { return 93; };\n"
	  "    if (nw != 2: size) { return 94; };\n"
	  "    if (buf[0] != 102u8 || buf[1] != 102u8) { return 95; };\n"
	  "    return 52;\n"
	  "};\n",
	  52,
	  STAGE_CS | STAGE_WW, 1 },
	{ "sign_plus",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "export fn main() i32 = {\n"
	  "    let path: str = \"/tmp/wwfmtm_780_d\";\n"
	  "    let fd: i32 = os.open(path, os.flag.RDWR | os.flag.CREATE | os.flag.TRUNC, 0o644: i32);\n"
	  "    if (fd < 0) { return 90; };\n"
	  "    let wr = fmt.fprintf(fd: io.file, \"{:+}\", 7i64);\n"
	  "    let nw: size = 0;\n"
	  "    match (wr) {\n"
	  "    case let n: size => { nw = n; };\n"
	  "    case io.error => { return 91; };\n"
	  "    };\n"
	  "    os.close(fd);\n"
	  "    let rd: i32 = os.open(path, os.flag.RDONLY, 0i32);\n"
	  "    if (rd < 0) { return 92; };\n"
	  "    let buf: [16]u8;\n"
	  "    let n: i64 = os.read(rd, &buf[0], 16u64);\n"
	  "    os.close(rd);\n"
	  "    if (n != 2i64) { return 93; };\n"
	  "    if (nw != 2: size) { return 94; };\n"
	  "    if (buf[0] != 43u8 || buf[1] != 55u8) { return 95; };\n"
	  "    return 53;\n"
	  "};\n",
	  53,
	  STAGE_CS | STAGE_WW, 1 },
	{ "zero_pad",
	  "package main;\n"
	  "import os;\n"
	  "import fmt;\n"
	  "import io;\n"
	  "export fn main() i32 = {\n"
	  "    let path: str = \"/tmp/wwfmtm_780_e\";\n"
	  "    let fd: i32 = os.open(path, os.flag.RDWR | os.flag.CREATE | os.flag.TRUNC, 0o644: i32);\n"
	  "    if (fd < 0) { return 90; };\n"
	  "    let wr = fmt.fprintf(fd: io.file, \"{:_05}\", 42i64);\n"
	  "    let nw: size = 0;\n"
	  "    match (wr) {\n"
	  "    case let n: size => { nw = n; };\n"
	  "    case io.error => { return 91; };\n"
	  "    };\n"
	  "    os.close(fd);\n"
	  "    let rd: i32 = os.open(path, os.flag.RDONLY, 0i32);\n"
	  "    if (rd < 0) { return 92; };\n"
	  "    let buf: [16]u8;\n"
	  "    let n: i64 = os.read(rd, &buf[0], 16u64);\n"
	  "    os.close(rd);\n"
	  "    if (n != 5i64) { return 93; };\n"
	  "    if (nw != 5: size) { return 94; };\n"
	  "    if (buf[0] != 48u8 || buf[1] != 48u8 || buf[2] != 48u8 || buf[3] != 52u8 || buf[4] != 50u8) { return 95; };\n"
	  "    return 54;\n"
	  "};\n",
	  54,
	  STAGE_CS | STAGE_WW, 1 },
};

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 (filed task #15), so each row's build leaves
 * <src>.{combined.ww,s,o} + bare exe alongside. Mirror of 777'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/fhm_%d_d_%d", getpid(), seq);
	snprintf(base,   sizeof base,   "main780");
	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;
}

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

	if (!wwpresent)
		fprintf(stderr, "fmt_mods_run: skip wwstage (no %s)\n", wdrv);

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