console.log("contentscript.js started!");

function getCurrentDate() {
  let today = new Date();
  let yyyy = today.getFullYear();
  let mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
  let dd = String(today.getDate()).padStart(2, '0');
  return yyyy + "-" + mm + "-" + dd;
}

function extractFileUrlsAndNames() {
console.log("contentscript.js: this is extractFileUrlsAndNames()");
  // get the correct frame
  let frame = document.querySelector("iframe.js-mail-content");
  
  // get all divs containing attachments
  let divs = frame.contentWindow.document.body.querySelectorAll("div.samoware-mail-message__attach__item[attachment-ref]"); 
  console.log(`contentscript.js: found ${divs.length} div containing attachments`);
  
  let urlsAndFilenames = []

  // loop over divs and extract attachment information
  divs.forEach(div => {
    let url = div.getAttribute("attachment-ref");
    let filename = div.getAttribute("file-name");

    // if filename is null, derive it from url 
    if ( ! filename ) {
      let splitUrl = url.split("/");
      filename = splitUrl[splitUrl.length-1];
    }
    urlsAndFilenames.push({url: url, filename: filename});
  })

  //console.log(`contentscript.js: urlsAndFilenames is ${JSON.stringify(urlsAndFilenames)}`);
  return urlsAndFilenames;
}

function onStartedDownload(id) {
  console.log(`contentscript.js: Started downloading: ${id}`);
}

function onFailedToStartDownload(error) {
  console.log(`contentscript.js: Download failed: ${error}`);
}

// get today's date
let currentDate = getCurrentDate();
console.log(`contentscript.js: currentDate is ${currentDate}`);

let urlsAndFilenames = extractFileUrlsAndNames();

// loop over attachments
for (let i = 0; i < urlsAndFilenames.length; i++) {
  // prefix filename
  let prefixedFilename = currentDate + " - " + urlsAndFilenames[i].filename;
console.log(`contentscript.js: prefixedFilename is ${prefixedFilename}`);

  // start download
  let downloading = browser.downloads.download({
    url: urlsAndFilenames[i].url,
    filename: prefixedFilename,
    saveAs: i == 0   // raise a path chooser dialog for the first file only; all later files will (hopefully!) be saved to the same folder
  });
  console.log(`contentscript.js: downloading is ${downloading}`);
  // resolve Promise
  downloading.then(onStartedDownload, onFailedToStartDownload);
} 

console.log("contentscript.js: has finished");
"contentscript.js: this is the final line";