#!/usr/bin/env node
import { createHash } from "node:crypto";
import { spawnSync } from "node:child_process";
import {
  cp,
  lstat,
  mkdir,
  mkdtemp,
  readFile,
  readdir,
  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 sourceRoot = platformRoot;
const artifactDir = resolve(
  process.env.NODEDC_DEPLOY_ARTIFACT_DIR
    || resolve(scriptDir, "../deploy-artifacts"),
);
const [
  patchId = "device-plane-backhaul-target-tailnet-serve-20260804-002",
  ...extra
] = process.argv.slice(2);

if (extra.length || !/^[A-Za-z0-9._-]{1,96}$/.test(patchId)) {
  throw new Error(
    "usage: build-device-plane-backhaul-target-artifact.mjs [patch-id]",
  );
}

const files = [
  "docker-compose.device-plane.backhaul-target.yml",
  "services/device-backhaul-target",
  "deployment/device-plane-backhaul-target-tailnet-serve-v1.json",
];
const ignoredBasenames = new Set([".DS_Store", ".git", "node_modules"]);
const stage = await mkdtemp(
  join(tmpdir(), "nodedc-device-plane-backhaul-target-"),
);
const payload = join(stage, "payload");
const target = join(
  artifactDir,
  `nodedc-device-plane-${patchId}.tgz`,
);

await assertBoundary();

try {
  await mkdir(payload, { recursive: true });
  for (const sourceRelative of files) {
    await copySafe(
      resolve(sourceRoot, sourceRelative),
      join(payload, sourceRelative),
    );
  }
  await writeFile(
    join(stage, "manifest.env"),
    `id=${patchId}\ncomponent=device-plane\ntype=app-overlay\n`,
    "utf8",
  );
  await writeFile(join(stage, "files.txt"), `${files.join("\n")}\n`, "utf8");
  await mkdir(artifactDir, { recursive: true });

  const tar = spawnSync(
    "python3",
    ["-c", canonicalTarScript(), target, stage],
    { encoding: "utf8", maxBuffer: 128 * 1024 * 1024 },
  );
  if (tar.status !== 0) {
    throw new Error(`tar_failed:${tar.stderr || tar.stdout}`);
  }

  const digest = createHash("sha256")
    .update(await readFile(target))
    .digest("hex");
  console.log(JSON.stringify({
    ok: true,
    patchId,
    artifact: target,
    sha256: digest,
    component: "device-plane",
    transition: "failed-backhaul-target-to-loopback-tailnet-serve",
    entries: files,
    services: ["device-backhaul-target"],
    preservedRuntime: [
      "device-control-core",
      "device-gateway",
      "device-postgres",
      "nodedc-device-plane-postgres-data",
      "Gelios",
    ],
    ingress: {
      loopbackListen: "127.0.0.1:2222/tcp",
      tailnetListen: "100.109.216.21:2222/tcp",
      transport: "tailscale-serve-private-ssh",
      serveTarget: "tcp://127.0.0.1:2222",
      permittedTarget: "127.0.0.1:9921",
      dockerPortPublication: "disabled",
      routerNatFirewall: "unchanged",
      edgePublicIngress: "disabled",
      funnel: "disabled",
      commandTransport: "disabled",
    },
    runtimeTrust: "runner-managed-not-in-artifact",
    rollback: "remove-tailnet-serve-target-and-restore-source",
  }, null, 2));
} finally {
  await rm(stage, { recursive: true, force: true });
}

async function assertBoundary() {
  const compose = await readFile(
    resolve(sourceRoot, "docker-compose.device-plane.backhaul-target.yml"),
    "utf8",
  );
  for (const fragment of [
    "device-backhaul-target:",
    "image: nodedc/device-backhaul-target:local",
    "network_mode: host",
    '"127.0.0.1", "2222"',
    "/secrets/backhaul-target/ssh_host_ed25519_key",
    "/secrets/backhaul-target/authorized_keys",
    "no-new-privileges:true",
  ]) {
    if (!compose.includes(fragment)) {
      throw new Error(`device_plane_backhaul_boundary_missing:${fragment}`);
    }
  }
  for (const forbidden of [
    "PasswordAuthentication yes",
    "0.0.0.0:2222",
    "9921:9921/udp",
    "DEVICE_GATEWAY_COMMAND",
  ]) {
    if (compose.includes(forbidden)) {
      throw new Error(`device_plane_backhaul_boundary_violation:${forbidden}`);
    }
  }

  const sshd = await readFile(
    resolve(sourceRoot, "services/device-backhaul-target/sshd_config"),
    "utf8",
  );
  for (const fragment of [
    "ListenAddress 127.0.0.1",
    "PasswordAuthentication no",
    "KbdInteractiveAuthentication no",
    "AllowTcpForwarding local",
    "PermitOpen 127.0.0.1:9921",
    "GatewayPorts no",
    "PermitTunnel no",
    "AllowAgentForwarding no",
    "PermitTTY no",
    "ForceCommand /bin/false",
  ]) {
    if (!sshd.includes(fragment)) {
      throw new Error(`device_plane_backhaul_sshd_boundary_missing:${fragment}`);
    }
  }

  const descriptor = JSON.parse(await readFile(
    resolve(
      sourceRoot,
      "deployment/device-plane-backhaul-target-tailnet-serve-v1.json",
    ),
    "utf8",
  ));
  const expected = {
    schemaVersion: "nodedc.device-plane.backhaul-target-tailnet-serve.v1",
    mode: "failed-backhaul-target-to-loopback-tailnet-serve",
    failedPatchId: "device-plane-backhaul-target-20260803-001",
    failedArtifactSha256:
      "ed0bda4110a756c32be68990e2e0f647409d5a77eec7e26c18502bafbdc1bb76",
    failedBackupId:
      "device-plane-device-plane-backhaul-target-20260803-001-20260804-035519",
    predecessorPatchId:
      "device-plane-b2-discovery-loopback-20260803-006",
    predecessorArtifactSha256:
      "25f9e9e55e283e9b7bb5e128ff14a244f848b1c063acca9724a23206131c9adf",
    sourceAction: "publish-loopback-backhaul-target-source",
    runtimeAction: "build-create-target-and-register-private-tailnet-serve",
    composeOverlay: "docker-compose.device-plane.backhaul-target.yml",
    selectedServices: ["device-backhaul-target"],
    preservedServices: [
      "device-control-core",
      "device-gateway",
      "device-postgres",
    ],
    loopbackListenAddress: "127.0.0.1",
    listenPort: 2222,
    tailnetAddress: "100.109.216.21",
    tailnetExposure: "tailscale-serve-private",
    tailscaleServeTarget: "tcp://127.0.0.1:2222",
    permittedTarget: "127.0.0.1:9921",
    networkMode: "host",
    dockerPortPublication: "disabled",
    routerNatFirewall: "unchanged",
    edgePublicIngress: "disabled",
    funnel: "disabled",
    commandTransport: "disabled",
    gelios: "untouched",
    databaseVolume: "nodedc-device-plane-postgres-data",
    runtimeTrust: "runner-managed",
    rollback: "remove-tailnet-serve-target-and-restore-source",
  };
  if (JSON.stringify(descriptor) !== JSON.stringify(expected)) {
    throw new Error("device_plane_backhaul_descriptor_mismatch");
  }
}

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");
}

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