cyberia/research/events/client/src/shared/lib/fileBase64Conveter.ts

export function getBase64(file: File): Promise<string> {
  return new Promise((resolve, reject) => {
    try {
      const reader = new FileReader();
      reader.onload = (event) => {
        const string = event.target?.result;
        if (typeof string !== "string")
          return reject("Failed to extract base64");
        const base = string.split(",")[1];
        if (base === undefined) return reject("Failed to split base64");
        resolve(
          JSON.stringify({
            type: file.type,
            name: file.name,
            base64: base,
          }),
        );
      };

      reader.onerror = (err) => {
        console.error("Can't extract base64", err);
        reject(err);
      };
      reader.readAsDataURL(file);
    } catch (e) {
      console.error("Can't extract base64", e);
      reject(e);
    }
  });
}

export function getImage(cover: string): File | null {
  if (!cover) return null;
  const fileObj = JSON.parse(cover);

  if (!fileObj.type || !fileObj.name || !fileObj.base64) return null;

  const { type, name, base64 } = fileObj;

  const byteCharacters = atob(base64);
  const byteNumbers = new Array(byteCharacters.length);
  for (let i = 0; i < byteCharacters.length; i++) {
    byteNumbers[i] = byteCharacters.charCodeAt(i);
  }

  const byteArray = new Uint8Array(byteNumbers);

  const blob = new Blob([byteArray], { type });

  try {
    const file = new File([blob], name, { type });
    return file;
  } catch (error) {
    console.error("Error creating File object:", error);
    return null;
  }
}