import { readdir, readFile } from "node:fs/promises";
import isValidUTF8 from "utf-8-validate";

let queue = ["../.."];
let files = {};
let count = 0;

while (queue.length) {
  const entries = await Promise.all(
    queue.slice(0, 100).map((path) => readdir(path, { withFileTypes: true })),
  );
  for (let i = 0; i < entries.length; ++i) {
    for (const entry of entries[i]) {
      if (entry.isDirectory()) {
        queue.push(`${queue[i]}/${entry.name}`);
      } else if (entry.isFile() && entry.name.endsWith(".dm")) {
        files[`${queue[i]}/${entry.name}`] = true;
      }
    }
  }
  queue = queue.slice(entries.length);
}

files = Object.keys(files);

while (files.length) {
  const queue = files.slice(0, 100);
  const buffers = await Promise.all(queue.map((path) => readFile(path)));
  for (let i = 0; i < queue.length; ++i) {
    if (!isValidUTF8(buffers[i])) {
      console.log(queue[i]);
      ++count;
    }
  }
  files = files.slice(100);
}

if (count) {
  process.exit(1);
}