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

const scriptDir = dirname(fileURLToPath(import.meta.url));
const platformRoot = resolve(scriptDir, "../..");
const artifactDir = resolve(scriptDir, "../deploy-artifacts");
const [patchId = "platform-map-gateway-20260714-001", ...extra] = process.argv.slice(2);
if (extra.length || !/^[A-Za-z0-9._-]{1,96}$/.test(patchId)) throw new Error("usage: build-map-gateway-artifact.mjs [patch-id]");

const files = [
  ["infra/synology/docker-compose.platform-http.yml", "platform/docker-compose.platform-http.yml"],
  ["services/map-gateway", "platform/services/map-gateway"],
];
const ignored = new Set([".DS_Store", ".git", "node_modules"]);
const stage = await mkdtemp(join(tmpdir(), "nodedc-map-gateway-artifact-"));
const payload = join(stage, "payload");
const target = join(artifactDir, `nodedc-platform-${patchId}.tgz`);

try {
  await mkdir(payload, { recursive: true });
  for (const [source, destination] of files) await copySafe(resolve(platformRoot, source), join(payload, destination));
  await writeFile(join(stage, "manifest.env"), `id=${patchId}\ncomponent=platform\ntype=app-overlay\n`, "utf8");
  await writeFile(join(stage, "files.txt"), `${files.map(([, destination]) => destination).join("\n")}\n`, "utf8");
  await mkdir(artifactDir, { recursive: true });
  const tar = spawnSync("python3", ["-c", "import sys,tarfile\nwith tarfile.open(sys.argv[1],'w:gz',format=tarfile.PAX_FORMAT) as a:\n [a.add(n,arcname=n,recursive=True) for n in ('manifest.env','files.txt','payload')]", target], { cwd: stage, encoding: "utf8" });
  if (tar.status !== 0) throw new Error(`tar_failed:${tar.stderr || tar.stdout}`);
  console.log(JSON.stringify({ ok: true, patchId, artifact: target, sha256: createHash("sha256").update(await readFile(target)).digest("hex") }, null, 2));
} finally {
  await rm(stage, { recursive: true, force: true });
}

async function copySafe(source, destination) {
  const info = await lstat(source);
  if (info.isSymbolicLink()) throw new Error(`source_symlink_rejected:${source}`);
  if (info.isFile()) { await mkdir(dirname(destination), { recursive: true }); await cp(source, destination, { force: true }); return; }
  if (!info.isDirectory()) throw new Error(`source_type_rejected:${source}`);
  await mkdir(destination, { recursive: true });
  for (const entry of await readdir(source, { withFileTypes: true })) {
    if (ignored.has(entry.name) || entry.name.startsWith(".env")) continue;
    const child = join(source, entry.name);
    if (entry.isSymbolicLink()) throw new Error(`source_symlink_rejected:${relative(platformRoot, child)}`);
    await copySafe(child, join(destination, entry.name));
  }
}