import { promises, readdirSync, statSync } from 'fs';

function cleanPath(path) {
  if (path.length && path.slice(-1) !== "/") {
    return path + "/";
  }
  return path;
}
function isHidden(filename) {
  return filename.slice(0, 1) === ".";
}
function split(filename) {
  const parts = filename.split(".");
  const ext = parts.length > 1 ? "." + parts.pop() : "";
  const file = parts.join(".");
  return { ext, file };
}
function isIgnoredResult(result) {
  return result === void 0 || result === false || result === null;
}
async function scanDirectory(path, callback, subdirs = true) {
  const results = [];
  path = cleanPath(path);
  async function scan(subdir) {
    const files = await promises.readdir(path + subdir);
    for (let i = 0; i < files.length; i++) {
      const filename = files[i];
      if (isHidden(filename)) {
        continue;
      }
      let stat;
      try {
        stat = await promises.stat(path + subdir + filename);
      } catch {
        continue;
      }
      if (stat.isDirectory()) {
        if (subdirs) {
          await scan(subdir + filename + "/");
        }
        continue;
      }
      if (!stat.isFile()) {
        continue;
      }
      const { ext, file } = split(filename);
      let callbackResult;
      if (callback) {
        callbackResult = callback(ext, file, subdir, path, stat);
        if (callbackResult instanceof Promise) {
          callbackResult = await callbackResult;
        }
        if (isIgnoredResult(callbackResult)) {
          continue;
        }
      } else {
        callbackResult = true;
      }
      results.push(
        callbackResult === true ? subdir + filename : callbackResult
      );
    }
  }
  await scan("");
  return results;
}
function scanDirectorySync(path, callback, subdirs = true) {
  const results = [];
  path = cleanPath(path);
  function scan(subdir) {
    const files = readdirSync(path + subdir);
    for (let i = 0; i < files.length; i++) {
      const filename = files[i];
      if (isHidden(filename)) {
        continue;
      }
      let stat;
      try {
        stat = statSync(path + subdir + filename);
      } catch {
        continue;
      }
      if (stat.isDirectory()) {
        if (subdirs) {
          scan(subdir + filename + "/");
        }
        continue;
      }
      if (!stat.isFile()) {
        continue;
      }
      const { ext, file } = split(filename);
      let callbackResult;
      if (callback) {
        callbackResult = callback(ext, file, subdir, path, stat);
        if (isIgnoredResult(callbackResult)) {
          continue;
        }
      } else {
        callbackResult = true;
      }
      results.push(
        callbackResult === true ? subdir + filename : callbackResult
      );
    }
  }
  scan("");
  return results;
}

export { scanDirectory, scanDirectorySync };