#!/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 artifactDir = resolve(process.env.NODEDC_DEPLOY_ARTIFACT_DIR || resolve(scriptDir, "../deploy-artifacts"));
const [patchId = "external-data-plane-20260714-001", ...extra] = process.argv.slice(2);

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

const files = [
  ["infra/synology/docker-compose.external-data-plane.yml", "platform/docker-compose.external-data-plane.yml"],
  ["services/external-data-plane", "platform/services/external-data-plane"],
  ["packages/external-provider-contract/package.json", "platform/packages/external-provider-contract/package.json"],
  ["packages/external-provider-contract/src/contract-version.mjs", "platform/packages/external-provider-contract/src/contract-version.mjs"],
  ["packages/external-provider-contract/src/data-plane.mjs", "platform/packages/external-provider-contract/src/data-plane.mjs"],
  ["packages/external-provider-contract/src/data-product.mjs", "platform/packages/external-provider-contract/src/data-product.mjs"],
  ["packages/external-provider-contract/src/intake-batch.mjs", "platform/packages/external-provider-contract/src/intake-batch.mjs"],
  ["packages/external-provider-contract/src/index.mjs", "platform/packages/external-provider-contract/src/index.mjs"],
  ["packages/external-provider-contract/src/sensitive-field-policy.mjs", "platform/packages/external-provider-contract/src/sensitive-field-policy.mjs"],
];
const ignoredBasenames = new Set([".DS_Store", ".git", "node_modules"]);
const ignoredDirectoryNames = new Set(["test"]);
const stage = await mkdtemp(join(tmpdir(), "nodedc-external-data-plane-artifact-"));
const payload = join(stage, "payload");
const target = join(artifactDir, `nodedc-platform-${patchId}.tgz`);

await assertSourceBoundary();

try {
  await mkdir(payload, { recursive: true });
  for (const [sourceRelative, destinationRelative] of files) {
    await copySafe(resolve(platformRoot, sourceRelative), join(payload, destinationRelative));
  }
  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", 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,
    entries: files.map(([, destination]) => destination),
    excluded: [
      ".env*",
      "node_modules",
      "services/external-data-plane/test",
      "private-key.pem",
      "secrets",
    ],
  }, null, 2));
} finally {
  await rm(stage, { recursive: true, force: true });
}

async function assertSourceBoundary() {
  const compose = await readFile(
    resolve(platformRoot, "infra/synology/docker-compose.external-data-plane.yml"),
    "utf8",
  );
  for (const fragment of [
    "source: /volume1/docker/nodedc-platform/trust/engine-managed-provisioner",
    "target: /run/nodedc-trust/engine-managed-provisioner",
    "EXTERNAL_DATA_PLANE_MANAGED_PROVISIONER_PUBLIC_KEY_FILE: /run/nodedc-trust/engine-managed-provisioner/public-key.pem",
    "create_host_path: false",
  ]) {
    if (!compose.includes(fragment)) throw new Error(`platform_compose_boundary_missing:${fragment}`);
  }
  if (
    compose.includes("private-key.pem")
    || compose.includes("ENGINE_EDP_MANAGED_PROVISIONER_PRIVATE_KEY_FILE")
  ) throw new Error("platform_artifact_private_key_boundary_violation");
  const server = await readFile(
    resolve(platformRoot, "services/external-data-plane/src/server.mjs"),
    "utf8",
  );
  for (const marker of [
    'managedWriterBindingLifetime: config.managedProvisionerApiEnabled ? "explicit-revoke" : "disabled"',
    'managedWriterBindings: "digest+idempotent-generation+explicit-revoke"',
    'app.put("/internal/data-plane/v1/reader-bindings/by-key/:bindingKey"',
    'managedReaderBindingProvisioning: config.managedProvisionerApiEnabled',
    'managedReaderBindingLifetime: config.managedProvisionerApiEnabled ? "explicit-revoke" : "disabled"',
    'managedReaderBindings: "digest+idempotent-generation+explicit-revoke"',
    'readerSourceScope: "writer-resolved+fail-closed-ambiguity"',
    'source_connection_id as "sourceConnectionId"',
    'where id = $1 and binding_key is null and active = true',
  ]) {
    if (!server.includes(marker)) throw new Error(`managed_reader_boundary_missing:${marker}`);
  }
  const readerSourceScope = await readFile(
    resolve(platformRoot, "services/external-data-plane/src/reader-source-scope.mjs"),
    "utf8",
  );
  for (const marker of [
    "managed_reader_source_scope_not_found",
    "managed_reader_source_scope_ambiguous",
    "external_data_plane_writer_bindings",
  ]) {
    if (!readerSourceScope.includes(marker)) throw new Error(`reader_source_scope_boundary_missing:${marker}`);
  }
}

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:${source}`);
  if (sourceStat.isFile()) {
    await mkdir(dirname(destination), { recursive: true });
    await cp(source, destination, { force: true, verbatimSymlinks: true });
    return;
  }
  if (!sourceStat.isDirectory()) throw new Error(`source_type_rejected:${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;
    if (entry.isDirectory() && ignoredDirectoryNames.has(entry.name)) continue;
    const childSource = join(source, entry.name);
    const childDestination = join(destination, entry.name);
    if (entry.isSymbolicLink()) throw new Error(`source_symlink_rejected:${relative(platformRoot, childSource)}`);
    await copySafe(childSource, childDestination);
  }
}