/*
 * 919_array_static_init_run — runtime + byte-id net for #129 Phase
 * A.3: module-level let/def with array initializer.
 *
 * Pre-A.3 state:
 *   - Int-element arrays (u8/i8/u16/u32/u64/i32 etc) already worked
 *     in both stages via fold_int_literal.
 *   - Float-element arrays ([N]f64, [N]f32) → undef-ref at link
 *     (emit_lets array arm fold_int_literal fails on FLOATLIT).
 *   - Array DEFs (def A: [N]T = [...]) → emit_defs no array arm
 *     (storage missing) AND cgindex broken (reads LEAQ (BP), BX —
 *     stack frame, not data section).
 *   - Array-in-struct field (`def D: dt = dt{tag=42, buf=[...]}`) →
 *     #129 A.2 rule-7 fatal "array field rhs not foldable" — the
 *     shape parked in A.2 awaiting A.3.
 *
 * Phase A.3 fix (mirror A.1/A.2 SSoT-helper precedent):
 *   - cstage: emit_array_data + emit_array_lit_bytes helpers with
 *     element-kind dispatch (int via fold_int_literal preserving
 *     bootstrap byte-id, float via inline bitcast + sign-XOR byte-
 *     loop mirror of A.1, struct via emit_struct_lit_bytes recursion
 *     mirror of A.2). Two-pass validate-then-emit avoids partial-byte
 *     corruption on rhs-fold-failure.
 *   - cstage: emit_lets array arm routes through helper; emit_defs
 *     gains array arm.
 *   - cstage: DefArray registry + def_isarraydef populated in
 *     let_collect; cgindex N_INDEX direct-ident `isglobal` gate
 *     widened to (let_islet || def_isarraydef).
 *   - cstage: emit_struct_lit_bytes (A.2 helper) gains TY_ARRAY field
 *     arm calling emit_array_lit_bytes recursively (closes A.2 parked
 *     shape 15).
 *   - wwstage: parallel emitarraydata + emitarraylitbytes; emitstruct
 *     litbytes TY_ARRAY arm; defvartnode helper; cgindex falls through
 *     to defvartnode after letvartnode nil.
 *
 * Bootstrap RISK: live consumers in lib/os, lib/bufio, lib/strings,
 * lib/encoding/utf8 (dfa + masks), lib/strconv/stof_data
 * (left_shift_table). All use typed-int-literal elements; the int-elem
 * helper path is byte-for-byte preserved → bootstrap NEUTRAL.
 *
 * Rows (size strata 1B/2B/4B/8B × count strata 1/2/4 × int/float/struct/
 * empty/no-rhs/def-variant, avoiding the 16B-evade pattern from A.2):
 *
 *   - (a) `let A: [4]u8 = [1u8, 2u8, 3u8, 4u8]` — 1B regression
 *   - (b) `let A: [4]u32 = [1u32, 2u32, 3u32, 4u32]` — 4B regression
 *   - (c) `let A: [2]u64 = [1u64, 2u64]` — 8B regression
 *   - (d) `let A: [4]i32 = [-1, -2, -3, -4]` — N_UN peel regression
 *   - (e) `let A: [4]f64 = [1.5, -2.5, 3.5, -4.5]` — NEW float-elem
 *   - (f) `let A: [4]f32 = [1.5f32, -2.5f32, 3.5f32, -4.5f32]` — NEW
 *     f32 narrow + sign-XOR per element
 *   - (g) `def A: [4]u32 = [11u32, 22u32, 33u32, 44u32]` — NEW
 *     def-storage + LOAD-widening
 *   - (h) `def A: [4]f64 = [1.5, 2.5, 3.5, 4.5]` — NEW def-variant of
 *     float
 *   - (i) `def D: dt = dt{tag=42, buf=[1u8,2u8,3u8,4u8]}` — NEW
 *     closes A.2 shape 15 (struct-with-array-field)
 *   - (j) `let A: [4]u8 = [0u8, 0u8, 0u8, 0u8]` — explicit-zero
 *     regression
 *   - (k) `let A: [1]u8 = [0u8]` — single-elem (matches lib/os/
 *     emptypath pattern)
 *
 * Each row: cstage `ww build` + run asserting exit code + w6c vs
 * w6c_ww `.s` cmp (rule-10 byte-id).
 *
 * Deferred:
 *   - Pointer-element arrays `[N]*T = [&G, &H]` — needs DATAR per
 *     element (own task/fold).
 *   - Nested arrays `[N][M]T` — no current consumer.
 *   - Bare-int `[N]u8 = [1, 2, 3, 4]` — #130 (checker issue).
 *   - Partial init `[4]u8 = [1u8]` — checker rejects (parser/checker
 *     decision).
 */
#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;
}

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

static const struct row rows[] = {
	{ "let_u8_arr",
	  "package main;\n"
	  "let A: [4]u8 = [1u8, 2u8, 3u8, 4u8];\n"
	  "export fn main() i32 = { return A[0]: i32; };\n", 1 },
	{ "let_u32_arr",
	  "package main;\n"
	  "let A: [4]u32 = [1u32, 2u32, 3u32, 4u32];\n"
	  "export fn main() i32 = { return A[0]: i32; };\n", 1 },
	{ "let_u64_arr",
	  "package main;\n"
	  "let A: [2]u64 = [1u64, 2u64];\n"
	  "export fn main() i32 = { return A[0]: i32; };\n", 1 },
	{ "let_i32_neg_arr",
	  "package main;\n"
	  "let A: [4]i32 = [-1, -2, -3, -4];\n"
	  "export fn main() i32 = { return A[0]; };\n", 255 /* -1 */ },
	/* Float-element array — NEW in A.3. Includes both signs to exercise
	 * the sign-XOR byte-loop per element. */
	{ "let_f64_arr",
	  "package main;\n"
	  "let A: [4]f64 = [1.5, -2.5, 3.5, -4.5];\n"
	  "export fn main() i32 = { return (A[0]: i32); };\n", 1 },
	{ "let_f32_arr",
	  "package main;\n"
	  "let A: [4]f32 = [1.5f32, -2.5f32, 3.5f32, -4.5f32];\n"
	  "export fn main() i32 = { return (A[0]: i32); };\n", 1 },
	/* def-variant exercises the LOAD-widening (def_isarraydef) at
	 * cgindex/cgident. Storage emit also new. */
	{ "def_u32_arr",
	  "package main;\n"
	  "def A: [4]u32 = [11u32, 22u32, 33u32, 44u32];\n"
	  "export fn main() i32 = { return A[0]: i32; };\n", 11 },
	{ "def_f64_arr",
	  "package main;\n"
	  "def A: [4]f64 = [1.5, 2.5, 3.5, 4.5];\n"
	  "export fn main() i32 = { return (A[0]: i32); };\n", 1 },
	/* The A.2-parked shape-15 — closes via emit_struct_lit_bytes
	 * TY_ARRAY field arm. */
	{ "let_struct_with_arr_field",
	  "package main;\n"
	  "type dt = struct { tag: i32, buf: [4]u8 };\n"
	  "let D: dt = dt{tag=42, buf=[1u8, 2u8, 3u8, 4u8]};\n"
	  "export fn main() i32 = { return D.tag; };\n", 42 },
	{ "let_u8_zero_arr",
	  "package main;\n"
	  "let A: [4]u8 = [0u8, 0u8, 0u8, 0u8];\n"
	  "export fn main() i32 = { return A[0]: i32; };\n", 0 },
	{ "let_u8_single",
	  "package main;\n"
	  "let A: [1]u8 = [7u8];\n"
	  "export fn main() i32 = { return A[0]: i32; };\n", 7 },
	{ NULL, NULL, 0 }
};

static int
slurp_eq(const char *a, const char *b)
{
	FILE *fa = fopen(a, "rb");
	FILE *fb = fopen(b, "rb");
	if (!fa || !fb) { if (fa) fclose(fa); if (fb) fclose(fb); return -1; }
	int rc = 0;
	for (;;) {
		int ca = fgetc(fa);
		int cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	return rc;
}

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 w6c[1100], w6c_ww[1100];
	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
	if (access(w6c_ww, X_OK) != 0) {
		fprintf(stderr, "arrinit: w6c_ww missing — cannot run "
		    "the cs==ww byte-id gate (the whole point of this test)\n");
		return 1;
	}

	int n = 0, fail = 0;
	for (int i = 0; rows[i].src; i++, n++) {
		char src[64];
		snprintf(src, sizeof src, "/tmp/wwari_%d_%d.ww", getpid(), i);
		FILE *f = fopen(src, "wb");
		if (f == NULL) { fail++; continue; }
		fputs(rows[i].src, f);
		fclose(f);

		char tmpdir[64];
		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwari_%d_d_%d",
		    getpid(), i);
		mkdir(tmpdir, 0755);

		char cmd[2048];
		snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s",
		    tmpdir, bin, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: cstage build failed\n",
			    rows[i].label);
			fail++;
			unlink(src); rmdir(tmpdir);
			continue;
		}

		char outbin[128];
		const char *base = strrchr(src, '/');
		base = base ? base + 1 : src;
		snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
		char *dot = strrchr(outbin, '.');
		if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';

		int got = runwait(outbin);
		if (got != rows[i].want_exit) {
			fprintf(stderr, "row[%s]: cstage exit %d, want %d\n",
			    rows[i].label, got, rows[i].want_exit);
			fail++;
		}
		unlink(outbin); rmdir(tmpdir);

		char cs_s[64], ws_s[64];
		snprintf(cs_s, sizeof cs_s, "/tmp/wwari_%d_%d_cs.s",
		    getpid(), i);
		snprintf(ws_s, sizeof ws_s, "/tmp/wwari_%d_%d_ww.s",
		    getpid(), i);

		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
		    w6c, cs_s, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: w6c failed\n", rows[i].label);
			fail++; unlink(src); continue;
		}
		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
		    w6c_ww, ws_s, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: w6c_ww failed\n",
			    rows[i].label);
			fail++; unlink(src); unlink(cs_s); continue;
		}
		if (slurp_eq(cs_s, ws_s) != 0) {
			fprintf(stderr,
			    "row[%s]: cstage/wwstage .s DIFFER (rule-10 "
			    "byte-id violation)\n", rows[i].label);
			fail++;
		}
		unlink(src); unlink(cs_s); unlink(ws_s);
	}

	if (fail) {
		fprintf(stderr, "%d/%d array-static-init tests failed\n", fail, n);
		return 1;
	}
	printf("arrinit: %d/%d ok (cstage run + cs==ww byte-id)\n",
	    n, n);
	return 0;
}