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

// 
function handleReceivedMessage(message) {
  // log received message
  console.log(`contentscript.js received a message with content ${message}`);

  // execute script regardless of message content
  const urlsAndFilenames = extractUrlsAndFilenames();
  clickPrintButton();
  console.log(`contentscript.js: URLs and filenames extracted ->  ${JSON.stringify(urlsAndFilenames)}`);

  // return data as the resolved Promise's payload
  return Promise.resolve({ urlsAndFilenames: urlsAndFilenames });
};

// extract URL and filename for each mail attachment
function extractUrlsAndFilenames() {
  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]");

  // loop over divs and extract attachment information
  let urlsAndFilenames = [];
  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 });
  });
  return urlsAndFilenames;
}

// trigger a click event on samoware's print button 
function clickPrintButton() {
  let printElement = document.querySelector('li[ng-click="printMessage(selectedMessage)"]');
  printElement.click();
}

browser.runtime.onMessage.addListener(handleReceivedMessage);