#!/usr/bin/env node

import { createHash } from "node:crypto";
import { spawnSync } from "node:child_process";
import { access, mkdir, readFile, writeFile } from "node:fs/promises";
import { homedir } from "node:os";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";

const root = join(dirname(fileURLToPath(import.meta.url)), "..");
const nodeVersion = "22.19.0";
const compiler = "x86_64-w64-mingw32-g++";
const cache = join(homedir(), ".cache", "rea-windows-native");
const output = join(root, "native", "windows", "build");
const run = (command, args) => {
  const result = spawnSync(command, args, {
    cwd: root,
    encoding: "utf8",
    maxBuffer: 4 * 1_024 * 1_024,
    timeout: 120_000,
  });
  if (result.error !== undefined)
    throw new Error(
      `Windows native build lane requires ${command}: ${result.error.message}`,
    );
  if (result.status !== 0)
    throw new Error(
      `Windows native build failed: ${result.stdout}${result.stderr}`,
    );
  return result.stdout;
};
if (process.platform !== "linux")
  throw new Error(
    "The Windows x64 artifact build lane currently requires Linux and MinGW-w64.",
  );
run(compiler, ["--version"]);
await mkdir(cache, { recursive: true });
await mkdir(output, { recursive: true });
const exists = async (path) =>
  access(path).then(
    () => true,
    () => false,
  );
const fetchBytes = async (name) => {
  const response = await fetch(
    `https://nodejs.org/dist/v${nodeVersion}/${name}`,
    {
      signal: AbortSignal.timeout(60_000),
    },
  );
  if (!response.ok)
    throw new Error(
      `Node build prerequisite download failed: ${name}: HTTP ${response.status}`,
    );
  return Buffer.from(await response.arrayBuffer());
};
const checksums = (await fetchBytes("SHASUMS256.txt")).toString("utf8");
const verifiedDownload = async (name, path) => {
  if (!(await exists(path))) await writeFile(path, await fetchBytes(name));
  const digest = createHash("sha256")
    .update(await readFile(path))
    .digest("hex");
  const expected = checksums
    .split("\n")
    .find((line) => line.slice(66) === name)
    ?.slice(0, 64);
  if (expected === undefined || digest !== expected)
    throw new Error(`Node build prerequisite SHA-256 mismatch: ${name}`);
};
const cachedHeaders = join(
  homedir(),
  ".cache",
  "node-gyp",
  nodeVersion,
  "include",
  "node",
);
let headers = cachedHeaders;
if (!(await exists(join(headers, "node_api.h")))) {
  const archive = join(cache, `node-v${nodeVersion}-headers.tar.gz`);
  await verifiedDownload(`node-v${nodeVersion}-headers.tar.gz`, archive);
  run("tar", ["xzf", archive, "-C", cache]);
  headers = join(cache, `node-v${nodeVersion}`, "include", "node");
}
const artifact = "rea-windows-x64.node";
// MSVC short-import libraries do not produce a correct Node import table with
// GNU ld. Generate a GNU import library for the exact stable Node-API symbols.
const sources = ["addon.cc", "filesystem.cc", "process.cc"];
const sourceText = (
  await Promise.all(
    sources.map((path) =>
      readFile(join(root, "native", "windows", "src", path), "utf8"),
    ),
  )
).join("\n");
const symbols = [
  ...new Set(
    [...sourceText.matchAll(/\b(napi_[a-z0-9_]+)\s*\(/gu)].map(
      (match) => match[1],
    ),
  ),
].sort();
const definition = join(cache, "node-api.def");
const library = join(cache, "libnode-api.a");
await writeFile(
  definition,
  `LIBRARY node.exe\nEXPORTS\n${symbols.join("\n")}\n`,
);
run("x86_64-w64-mingw32-dlltool", ["-d", definition, "-l", library]);
run(compiler, [
  "-std=c++17",
  "-O2",
  "-DNAPI_VERSION=8",
  "-D_WIN32_WINNT=0x0A00",
  "-shared",
  "-static",
  "-static-libgcc",
  "-static-libstdc++",
  "-Wl,--no-insert-timestamp",
  `-I${headers}`,
  "native/windows/src/addon.cc",
  "native/windows/src/filesystem.cc",
  "native/windows/src/process.cc",
  library,
  "-ladvapi32",
  "-lbcrypt",
  "-lntdll",
  "-o",
  join(output, artifact),
]);
const packageJson = JSON.parse(
  await readFile(join(root, "package.json"), "utf8"),
);
const bytes = await readFile(join(output, artifact));
const metadata = {
  packageVersion: packageJson.version,
  platform: "win32",
  architecture: "x64",
  abiVersion: 1,
  nodeApiVersion: 8,
  artifact,
  artifactSha256: createHash("sha256").update(bytes).digest("hex"),
};
await writeFile(
  join(output, "manifest.json"),
  `${JSON.stringify(metadata, null, 2)}\n`,
);
process.stdout.write(
  `${JSON.stringify({ ...metadata, artifactBytes: bytes.length })}\n`,
);