#!/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 = resolve(platformRoot, "device-plane");
const artifactDir = resolve(
  process.env.NODEDC_DEPLOY_ARTIFACT_DIR
    || resolve(scriptDir, "../deploy-artifacts"),
);
const [
  patchId = "device-edge-ingress-ipvlan-20260804-001",
  ...extra
] = process.argv.slice(2);

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

const files = [
  "docker-compose.device-edge.yml",
  "docker-compose.device-edge.ingress.yml",
  "services/device-edge-relay/Dockerfile",
  "services/device-edge-relay/src",
  "deployment/device-edge-ingress-ipvlan-v1.json",
];
const ignoredBasenames = new Set([".DS_Store", ".git", "node_modules"]);
const descriptor = await assertBoundary();
if (descriptor.ingressIpv4Approval !== "approved-outside-dhcp-pool") {
  throw new Error("device_edge_ingress_ipv4_approval_pending");
}

const stage = await mkdtemp(join(tmpdir(), "nodedc-device-edge-ingress-"));
const payload = join(stage, "payload");
const target = join(artifactDir, `nodedc-device-edge-${patchId}.tgz`);

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=${patchId}\ncomponent=device-edge\ntype=app-overlay\n`,
    "utf8",
  );
  await writeFile(join(stage, "files.txt"), `${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-edge",
    transition: "single-nic-ipvlan-b2-relay-only",
    entries: files,
    services: ["device-edge-relay"],
    preservedRuntime: ["device-edge-backhaul", "tailnet", "Gelios"],
    ingress: {
      parent: descriptor.parentInterface,
      subnet: descriptor.lanSubnet,
      gateway: descriptor.lanGateway,
      ipv4: descriptor.ingressIpv4,
      ipv4Approval: descriptor.ingressIpv4Approval,
      tcp: 9921,
      hostPortPublication: "disabled",
      lifecycle: "quarantine",
      commandTransport: "disabled",
    },
    rollback: descriptor.rollback,
  }, null, 2));
} finally {
  await rm(stage, { recursive: true, force: true });
}

async function assertBoundary() {
  const baseline = await readFile(
    resolve(sourceRoot, "docker-compose.device-edge.yml"),
    "utf8",
  );
  const ingress = await readFile(
    resolve(sourceRoot, "docker-compose.device-edge.ingress.yml"),
    "utf8",
  );
  const descriptor = JSON.parse(await readFile(
    resolve(
      sourceRoot,
      "deployment/device-edge-ingress-ipvlan-v1.json",
    ),
    "utf8",
  ));

  for (const fragment of [
    "DEVICE_EDGE_RELAY_HEALTH_HOST: 127.0.0.1",
    'DEVICE_EDGE_RELAY_INGRESS_ENABLED: "false"',
    "read_only: true",
    'user: "1000:1000"',
    "no-new-privileges:true",
    "cap_drop:",
    "- ALL",
  ]) {
    if (!baseline.includes(fragment)) {
      throw new Error(`device_edge_baseline_boundary_missing:${fragment}`);
    }
  }
  for (const forbidden of ["ports:", "device-edge-control"]){
    if (baseline.includes(forbidden)) {
      throw new Error(`device_edge_baseline_boundary_violation:${forbidden}`);
    }
  }

  for (const fragment of [
    'DEVICE_EDGE_RELAY_INGRESS_ENABLED: "true"',
    "DEVICE_EDGE_RELAY_UPSTREAM_HOST: device-edge-backhaul",
    'DEVICE_EDGE_RELAY_UPSTREAM_PORT: "19921"',
    "name: nodedc-device-edge-ingress",
    "driver: ipvlan",
    "parent: enp1s0f0",
    "ipvlan_mode: l2",
    "ipv4_address: 192.168.71.253",
    "gw_priority: 100",
    "subnet: 192.168.68.0/22",
    "gateway: 192.168.68.1",
  ]) {
    if (!ingress.includes(fragment)) {
      throw new Error(`device_edge_ingress_boundary_missing:${fragment}`);
    }
  }
  for (const forbidden of [
    "ports:",
    "network_mode: host",
    "privileged: true",
    "DEVICE_EDGE_RELAY_COMMAND",
    "0.0.0.0:9921:9921",
  ]) {
    if (ingress.includes(forbidden)) {
      throw new Error(`device_edge_ingress_boundary_violation:${forbidden}`);
    }
  }

  const expected = {
    schemaVersion: "nodedc.device-edge.ingress-ipvlan.v1",
    mode: "single-nic-ipvlan-b2-relay-only",
    runtimeHost: "ndcmini12",
    component: "device-edge",
    selectedServices: ["device-edge-relay"],
    preservedServices: ["device-edge-backhaul", "tailnet"],
    composeProject: "nodedc-device-edge",
    composeFiles: [
      "docker-compose.device-edge.yml",
      "docker-compose.device-edge.ingress.yml",
    ],
    parentInterface: "enp1s0f0",
    lanSubnet: "192.168.68.0/22",
    lanGateway: "192.168.68.1",
    ingressIpv4: "192.168.71.253",
    ingressIpv4Approval: "approved-outside-dhcp-pool",
    ingressNetwork: "nodedc-device-edge-ingress",
    deviceTcpListen: "192.168.71.253:9921",
    hostPortPublication: "disabled",
    healthPublication: "disabled",
    privateUpstream: "device-edge-backhaul:19921",
    protocolInspection: "gateway-owned",
    identityTrust: "claimed-not-ownership-proof",
    discoveryLifecycle: "quarantine",
    commandTransport: "disabled",
    gelios: "untouched",
    amneziaHostFullTunnel: "preserved",
    routerNatFirewall: "separate-manual-gate",
    rollback: "restore-predecessor-relay-remove-unused-ingress-network",
  };
  if (JSON.stringify(descriptor) !== JSON.stringify(expected)) {
    throw new Error("device_edge_ingress_descriptor_mismatch");
  }
  return descriptor;
}

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")
    ) {
      continue;
    }
    const childSource = join(source, entry.name);
    const childDestination = join(destination, entry.name);
    if (entry.isSymbolicLink()) {
      throw new Error(
        `source_symlink_rejected:${relative(sourceRoot, childSource)}`,
      );
    }
    await copySafe(childSource, childDestination);
  }
}