import { inferSchema, initParser } from 'udsv';
export function fileToBase64(file: File) {
  return new Promise<string>((resolve, reject) => {
    const reader = new FileReader();
    reader.addEventListener('error', reject);
    reader.addEventListener('load', () => resolve(reader.result as string));
    reader.readAsDataURL(file);
  });
}

export async function csvToData<T extends Record<string, any>>(
  file: File,
): Promise<T[] | null> {
  const stream = file.stream().pipeThrough(new TextDecoderStream());
  const reader = stream.getReader();

  const { value, done } = await reader.read();

  if (value) {
    const parser = initParser(inferSchema(value));
    const data = parser.typedObjs<T>(value);
    return data;
  }

  if (done) return null;

  return null;
}