type MimeType =
  | "text/plain"
  | "text/html"
  | "text/css"
  | "text/javascript"
  | "text/csv"
  | "application/json"
  | "application/xml"
  | "application/pdf"
  | "application/zip"
  | "application/octet-stream"
  | "image/png"
  | "image/jpeg"
  | "image/gif"
  | "image/svg+xml"
  | "audio/mpeg"
  | "audio/wav"
  | "video/mp4"
  | "video/webm"
  | (string & {});

type DownloadableContent =
  | [string, MimeType]
  | [Blob, MimeType]
  | [ArrayBuffer, MimeType]
  | [Uint8Array, MimeType]
  | [Int8Array, MimeType]
  | [Uint16Array, MimeType]
  | [Int16Array, MimeType]
  | [Uint32Array, MimeType]
  | [Int32Array, MimeType]
  | [Float32Array, MimeType]
  | [Float64Array, MimeType]
  | [DataView, MimeType]
  | Blob // Blob already has mimeType
  | File; // File already has mimeType

export const downloadContent = (content: DownloadableContent, filename: string) => {
  let blob: Blob;

  if (content instanceof Blob) {
    blob = content;
  } else if (content instanceof File) {
    blob = content;
  } else if (Array.isArray(content) && content.length === 2) {
    const [data, mimeType] = content;
    if (typeof data === "string") {
      blob = new Blob([data], { type: mimeType });
    } else if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
      blob = new Blob([data as BlobPart], { type: mimeType });
    } else if (data instanceof Blob) {
      blob = new Blob([data], { type: mimeType });
    } else {
      throw new Error(`Unsupported data type for download. Received data of type ${typeof data}.`);
    }
  } else {
    throw new Error(
      "Invalid content type. Content must be a Blob, File, or [data, mimeType] tuple.",
    );
  }

  const objectUrl = URL.createObjectURL(blob);

  try {
    const link = document.createElement("a");
    link.href = objectUrl;
    link.download = filename;

    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
  } catch (error) {
    throw new Error(`Failed to download ${filename}`, { cause: error });
  } finally {
    URL.revokeObjectURL(objectUrl);
  }
};