#!/usr/bin/env node

import { createHash } from "node:crypto";
import { spawnSync } from "node:child_process";
import { copyFile, lstat, 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 workspaceRoot = resolve(scriptDir, "../../..");
const foundryRoot = resolve(workspaceRoot, "NODEDC_DESIGN_GUIDELINE");
const artifactDir = resolve(
  process.env.NODEDC_DEPLOY_ARTIFACT_DIR || resolve(scriptDir, "../deploy-artifacts"),
);
const [patchId = "module-foundry-unit-identity-20260724-011", ...extra] =
  process.argv.slice(2);

if (extra.length || !/^module-foundry-unit-identity-\d{8}-\d{3}$/.test(patchId)) {
  throw new Error(
    "usage: build-module-foundry-unit-identity-artifact.mjs "
      + "[module-foundry-unit-identity-YYYYMMDD-NNN]",
  );
}

const expectedSha256 = Object.freeze({
  "apps/catalog/src/MapFixturePreview.tsx":
    "0ab08a872a8ec4cfb5144c808e361fa42e261bc14a23350843c487e3639d3cf7",
  "apps/catalog/src/mapSubjectCard.d.mts":
    "3a1afd1b2da42fe843bd50a9199137b5a490cc87759375033e17e18368ad019f",
  "apps/catalog/src/mapSubjectCard.mjs":
    "e235ca0b33ebed687ab62d2a3a5ff0cc865af4c51d42f1b920822077ddd67de1",
  "registry/data-product-consumer-policies.json":
    "7817e9ffbb8eb0e20445c97e3c2684d4dfa4e217ead569241052b9f29789ab44",
  "server/foundry-data-product-consumer.mjs":
    "3a21d887368bd28bf538e8bcda45cbd3e1fa775b8e21092ade50dd913ad29305",
  "server/foundry-mcp.mjs":
    "1a80ba6398e1a038fd07cb118de48f23402433863559b310942a0f6cb01d974b",
  "server/map-subject-detail-profile.mjs":
    "2d3d466c1798bd9a0c0c8c766235bde1792285498309fbbe58d4c1892ed62862",
});
const files = Object.freeze(Object.keys(expectedSha256));
const artifact = join(artifactDir, `nodedc-${patchId}.tgz`);
const checksum = `${artifact}.sha256`;
const stage = await mkdtemp(join(tmpdir(), "nodedc-foundry-unit-identity-"));

await assertFresh(artifact);
await assertExactSources();

try {
  for (const relativePath of files) {
    const destination = join(stage, "payload", relativePath);
    await mkdir(dirname(destination), { recursive: true });
    await copyFile(join(foundryRoot, relativePath), destination);
  }
  await writeFile(
    join(stage, "manifest.env"),
    `id=${patchId}\ncomponent=module-foundry\ntype=app-overlay\n`,
    "utf8",
  );
  await writeFile(join(stage, "files.txt"), `${files.join("\n")}\n`, "utf8");
  await mkdir(artifactDir, { recursive: true });
  run("python3", ["-c", canonicalTarScript(), artifact, stage]);
  const sha256 = digest(await readFile(artifact));
  await writeFile(checksum, `${sha256}  ${artifact.split("/").at(-1)}\n`, "utf8");
  console.log(JSON.stringify({
    ok: true,
    patchId,
    artifact,
    checksum,
    sha256,
    services: ["nodedc-module-foundry"],
    presentation: "provider-neutral-restricted-string-lists",
    files,
  }, null, 2));
} finally {
  await rm(stage, { recursive: true, force: true });
}

async function assertExactSources() {
  for (const [relativePath, expected] of Object.entries(expectedSha256)) {
    const sourcePath = join(foundryRoot, relativePath);
    const info = await lstat(sourcePath);
    if (!info.isFile() || info.isSymbolicLink()) {
      throw new Error(`foundry_unit_identity_source_unsafe:${relativePath}`);
    }
    const actual = digest(await readFile(sourcePath));
    if (actual !== expected) {
      throw new Error(
        `foundry_unit_identity_target_mismatch:${relativePath}:`
          + `expected=${expected}:actual=${actual}`,
      );
    }
  }
  const profile = await readFile(
    join(foundryRoot, "server/map-subject-detail-profile.mjs"),
    "utf8",
  );
  const card = await readFile(
    join(foundryRoot, "apps/catalog/src/mapSubjectCard.mjs"),
    "utf8",
  );
  const consumer = await readFile(
    join(foundryRoot, "server/foundry-data-product-consumer.mjs"),
    "utf8",
  );
  if (
    !profile.includes("string_list")
    || !card.includes("string_list")
    || !consumer.includes("string_array")
    || /gelios\.provider/i.test(profile)
    || /gelios\.provider/i.test(card)
  ) {
    throw new Error("foundry_unit_identity_provider_neutral_boundary_invalid");
  }
  const policies = JSON.parse(await readFile(
    join(foundryRoot, "registry/data-product-consumer-policies.json"),
    "utf8",
  ));
  const policy = policies?.policies?.find(
    (entry) => entry?.dataProductId === "fleet.units.identity.current.v1",
  );
  if (
    policy?.dataClass !== "restricted"
    || policy?.consumerContract?.fieldTypes?.device_imei !== "string"
    || policy?.consumerContract?.fieldTypes?.custom_fields !== "string_array"
  ) {
    throw new Error("foundry_unit_identity_policy_invalid");
  }
}

async function assertFresh(path) {
  try {
    await lstat(path);
  } catch (error) {
    if (error?.code === "ENOENT") return;
    throw error;
  }
  throw new Error("artifact_already_exists");
}

function canonicalTarScript() {
  return [
    "import gzip,io,pathlib,sys,tarfile",
    "root=pathlib.Path(sys.argv[2])",
    "with open(sys.argv[1],'xb') 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");
}

function digest(value) {
  return createHash("sha256").update(value).digest("hex");
}

function run(command, args) {
  const result = spawnSync(command, args, {
    encoding: "utf8",
    maxBuffer: 64 * 1024 * 1024,
  });
  if (result.status !== 0) {
    throw new Error(`${command}_failed:${result.stderr || result.stdout}`);
  }
}