import JSZip from 'jszip';

export interface DownloadUrlItem {
  name: string;
  url: string;
}

export function downloadFile(fileUrl: string, fileName: string): void {
  // if (fileUrl.includes('/media') && !fileUrl.startsWith('blob:')) {
  //   fileUrl += fileUrl.includes('?') ? '&download=true' : '?download=true';
  // }
  const a = document.createElement('a');
  a.style.display = 'none';
  a.href = fileUrl;
  a.download = fileName;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
}

export async function fetchBlob(fetchUrl: string): Promise<Blob> {
  const response = await window.fetch(fetchUrl, {
    method: 'GET',
    headers: new Headers({ 'Access-Control-Allow-Origin': '*' }),
  });
  const blob = await response.blob();
  return blob;
}

export function downloadFiles(downloadUrlItems: DownloadUrlItem[], fileName?: string): void {
  if (!fileName) {
    fileName = new Date().getTime().toString() + ".zip";
  }

  const zip = new JSZip();
  for (let item of downloadUrlItems) {
    zip.file(item.name, fetchBlob(item.url));
  }

  zip.generateAsync({ type: "blob" }).then(blob => {
    const url = window.URL.createObjectURL(blob);
    downloadFile(url, fileName);
  });
}