#!/usr/bin/env node
import { createHash } from "node:crypto";
import { spawnSync } from "node:child_process";
import { cp, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";

const scriptDir = dirname(fileURLToPath(import.meta.url));
const sourceRoot = resolve(scriptDir, "../..");
const artifactDir = resolve(
  process.env.NODEDC_DEPLOY_ARTIFACT_DIR
    || resolve(scriptDir, "../deploy-artifacts"),
);
const [
  patchId = "device-control-core-incident-audit-20260822-043",
  ...extra
] = process.argv.slice(2);
if (extra.length || !/^[A-Za-z0-9._-]{1,96}$/.test(patchId)) {
  throw new Error("usage: build-device-control-core-incident-audit-artifact.mjs [patch-id]");
}

const entry = "deployment/device-control-core-incident-audit-v1.json";
const stage = await mkdtemp(join(tmpdir(), "nodedc-control-core-incident-audit-"));
const payload = join(stage, "payload");
const target = resolve(artifactDir, `nodedc-device-plane-${patchId}.tgz`);

try {
  const descriptor = JSON.parse(await readFile(resolve(sourceRoot, entry), "utf8"));
  if (
    descriptor.schemaVersion
      !== "nodedc.device-plane.device-control-core-incident-audit.v1"
    || descriptor.mode !== "double-rollback-failed-read-only-audit"
    || descriptor.allowedOperation !== "canonical-plan-only"
    || descriptor.applyAllowed !== false
    || descriptor.runtimeMutation !== "none"
    || descriptor.sourceMutation !== "none"
    || descriptor.databaseMutation !== "none"
    || descriptor.networkMutation !== "none"
    || descriptor.secretRead !== "none"
  ) {
    throw new Error("device_control_core_incident_audit_descriptor_mismatch");
  }

  await mkdir(dirname(join(payload, entry)), { recursive: true });
  await cp(resolve(sourceRoot, entry), join(payload, entry), { force: true });
  await writeFile(
    join(stage, "manifest.env"),
    `id=${patchId}\ncomponent=device-plane\ntype=app-overlay\n`,
    "utf8",
  );
  await writeFile(join(stage, "files.txt"), `${entry}\n`, "utf8");
  await mkdir(artifactDir, { recursive: true });
  const tar = spawnSync(
    "python3",
    ["-c", canonicalTarScript(), target, stage],
    { encoding: "utf8", maxBuffer: 16 * 1024 * 1024 },
  );
  if (tar.status !== 0) throw new Error(`tar_failed:${tar.stderr || tar.stdout}`);
  const sha256 = createHash("sha256")
    .update(await readFile(target))
    .digest("hex");
  console.log(JSON.stringify({
    ok: true,
    patchId,
    component: "device-plane",
    artifact: target,
    sha256,
    entries: [entry],
    build: [],
    services: [],
    allowedOperation: descriptor.allowedOperation,
    runtimeMutation: descriptor.runtimeMutation,
  }, null, 2));
} finally {
  await rm(stage, { recursive: true, force: true });
}

function canonicalTarScript() {
  return [
    "import gzip,io,pathlib,sys,tarfile",
    "root=pathlib.Path(sys.argv[2])",
    "with open(sys.argv[1],'wb') as out:",
    " with gzip.GzipFile(filename='',mode='wb',fileobj=out,compresslevel=9,mtime=0) as gz:",
    "  with tarfile.open(fileobj=gz,mode='w',format=tarfile.PAX_FORMAT) as tar:",
    "   for top in ('manifest.env','files.txt','payload'):",
    "    p=root/top; paths=[p]+(sorted(p.rglob('*')) if p.is_dir() else [])",
    "    for x in paths:",
    "     info=tar.gettarinfo(str(x),arcname=x.relative_to(root).as_posix()); info.uid=info.gid=0; info.uname=info.gname='root'; info.mtime=0; info.mode=0o755 if info.isdir() else 0o644",
    "     with (open(x,'rb') if info.isfile() else io.BytesIO()) as src: tar.addfile(info,src if info.isfile() else None)",
  ].join("\n");
}