import type { Attachment } from "@root/model/attachment";

type KeyValue<T = string> = {
  [key: string]: T;
};

const convertBinaryStringToFile = ({
  name,
  content,
  mimetype,
}: Attachment): File => {
  const bytes = new Uint8Array(content.length);

  for (let index = 0; index < content.length; index += 1) {
    bytes[index] = content.charCodeAt(index);
  }

  const blob = new Blob([bytes], { type: mimetype });

  return new File([blob], name, { type: blob.type });
};

export const jsonToFormdata = (
  json: KeyValue<string | Attachment>
): FormData => {
  const formData = new FormData();

  for (const key in json) {
    if (!key) continue;

    const value = json[key];

    if (typeof value !== "string") {
      formData.append(key, convertBinaryStringToFile(value));

      continue;
    }

    formData.append(key, value);
  }

  return formData;
};