#!/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 platformRoot = resolve(scriptDir, "../..");
const artifactDir = resolve(process.env.NODEDC_DEPLOY_ARTIFACT_DIR || resolve(scriptDir, "../deploy-artifacts"));
const [patchId = "platform-device-manager-public-route-20260810-001", ...extra] = process.argv.slice(2);
if (extra.length || !/^[A-Za-z0-9._-]{1,96}$/.test(patchId)) throw new Error("usage: build-platform-device-manager-route-artifact.mjs [patch-id]");

const entries = [
  "platform/Caddyfile.http",
  "platform/deployment/device-manager-public-route-v1.json",
];
const stage = await mkdtemp(join(tmpdir(), "nodedc-device-manager-route-"));
const payload = join(stage, "payload");
const target = join(artifactDir, `nodedc-platform-${patchId}.tgz`);
try {
  await mkdir(join(payload, "platform/deployment"), { recursive: true });
  await cp(resolve(platformRoot, "infra/synology/Caddyfile.http"), join(payload, entries[0]), { force: true });
  await cp(resolve(platformRoot, "infra/deployment/device-manager-public-route-v1.json"), join(payload, entries[1]), { force: true });
  const caddy = await readFile(join(payload, entries[0]), "utf8");
  for (const required of ["http://device.nodedc.ru", "reverse_proxy device-manager:18122", "X-Forwarded-Proto https"]) {
    if (!caddy.includes(required)) throw new Error(`device_manager_route_contract_missing:${required}`);
  }
  await writeFile(join(stage, "manifest.env"), `id=${patchId}\ncomponent=platform\ntype=app-overlay\n`, "utf8");
  await writeFile(join(stage, "files.txt"), `${entries.join("\n")}\n`, "utf8");
  await mkdir(artifactDir, { recursive: true });
  const tar = spawnSync("python3", ["-c", canonicalTarScript(), target, stage], { encoding: "utf8" });
  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: "platform", artifact: target, sha256, entries, services: ["reverse-proxy"] }, 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");
}