import { readdirSync, statSync } from "node:fs";
import { join, relative } from "node:path";

const root = process.cwd();
const srcDir = join(root, "src");

const offenders = [];

function walk(dir) {
  for (const entry of readdirSync(dir)) {
    const full = join(dir, entry);
    const stat = statSync(full);

    if (stat.isDirectory()) {
      walk(full);
      continue;
    }

    if (entry.endsWith(".js") || entry.endsWith(".js.map")) {
      offenders.push(relative(root, full));
    }
  }
}

walk(srcDir);

if (offenders.length > 0) {
  console.error("");
  console.error("ERROR: Generated JavaScript files were found inside backend/src.");
  console.error("backend/src must contain TypeScript source only.");
  console.error("");
  console.error("Delete these files:");
  for (const file of offenders) {
    console.error(`  - ${file}`);
  }
  console.error("");
  process.exit(1);
}