#!/usr/bin/env node

import { execFile } from "node:child_process";
import { promisify } from "node:util";

const execFileAsync = promisify(execFile);
const cwd = process.cwd();

async function compileRuntime() {
  try {
    await execFileAsync("npm", ["run", "compile", "--silent"], {
      cwd,
      maxBuffer: 10 * 1024 * 1024,
    });
  } catch (error) {
    const code = typeof error === "object" && error !== null && "code" in error
      ? String(error.code)
      : "unknown";
    throw new Error(`runtime compilation failed with exit code ${code}`);
  }
}

async function generatedRuntimeDrift() {
  const [{ stdout: changed }, { stdout: untracked }] = await Promise.all([
    execFileAsync("git", ["diff", "--name-status", "--", "dist/src"], { cwd }),
    execFileAsync(
      "git",
      ["ls-files", "--others", "--exclude-standard", "--", "dist/src"],
      { cwd },
    ),
  ]);
  return [changed.trim(), untracked.trim()].filter(Boolean).join("\n");
}

async function verify() {
  await compileRuntime();
  const drift = await generatedRuntimeDrift();
  if (drift !== "") {
    throw new Error(`generated runtime drift detected in dist/src:\n${drift}`);
  }
  process.stdout.write("Generated runtime is fresh.\n");
}

verify().catch((error) => {
  const message = error instanceof Error ? error.message : String(error);
  process.stderr.write(`Generated-runtime verification failed: ${message}\n`);
  process.exitCode = 1;
});