#!/usr/bin/env node

import { constants } from 'node:fs';
import { access } from 'node:fs/promises';
import { fileURLToPath } from 'node:url';
import path from 'node:path';

export const MISSING_DEPS_EXIT = 42;

// The generated-state certification that used to live here (fingerprinting the
// web source tree and certifying apps/web/.next) retired with the Next.js build
// in Phase P5 (#1444): the Vite SPA has no generated tree that later gates
// consume, so there is no stale-output class left to defend against.

export async function runPreflight({ root = process.cwd() } = {}) {
  const binDir = path.join(root, 'node_modules', '.bin');
  const requiredBinaries = ['eslint', 'husky', 'prettier', 'tsc', 'turbo', 'vitest'];
  const missingBinaries = [];
  for (const binary of requiredBinaries) {
    try {
      await access(path.join(binDir, binary), constants.X_OK);
    } catch {
      missingBinaries.push(binary);
    }
  }
  if (missingBinaries.length > 0) {
    return {
      code: MISSING_DEPS_EXIT,
      message: `MOSAIC_PREFLIGHT_MISSING_DEPS: dependency installation is missing ${missingBinaries.join(', ')}; run pnpm install --frozen-lockfile`,
    };
  }

  return { code: 0, message: 'checkout preflight passed' };
}

async function main() {
  const result = await runPreflight();
  const stream = result.code === 0 ? process.stdout : process.stderr;
  stream.write(`${result.message}\n`);
  process.exitCode = result.code;
}

if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
  await main();
}