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


// get date email was received on
function extractDate() {
  console.log("contentscript.js: this is extractDate()");
  
  // get element containing date from mail list 
  const dateElement = document.querySelector(".samoware-mail-list__item_mode_active .samoware-mail-list__time");
  
  // robustify
  if ( dateElement === null ) {
    return "nodate";
  } 
  
  // check if date is actually a time and return today's date
  if ( dateElement.innerText.includes(":") ) {
    return getTodaysDate();
  }

  // parse date string
  const dateArray = dateElement.innerText.split("/");
  const yyyy = "20" + String(dateArray.pop());
  const mm = String(dateArray.pop()).padStart(2, '0');  
  const dd = String(dateArray.pop()).padStart(2, '0');

  // log value and return
  console.log(`contentscript.js: date is ${yyyy + mm + dd}`);
  return yyyy + mm + dd;
}

function getTodaysDate() {
  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');

  // log value and return
  console.log(`contentscript.js: today's date is ${yyyy + mm + dd}`);
  return yyyy + mm + dd;
}


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

    // get date email was received on
  const date = extractDate();

  // get urls and filenames
  const urlsAndFilenames = extractUrlsAndFilenames();
  console.log(`contentscript.js: URLs and filenames extracted ->  ${JSON.stringify(urlsAndFilenames)}`);
  
  // trigger click on print button  
  clickPrintButton();

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

// extract URL and filename for each mail attachment
function extractUrlsAndFilenames() {
  console.log("contentscript.js: this is extractUrlsAndFilenames()");
  
  // get the correct frame
  const frame = document.querySelector("iframe.js-mail-content");

  // get all divs containing attachments
  const 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) => {
    // get url
    const url = div.getAttribute("attachment-ref");

    // get filename
    let filename = div.getAttribute("file-name");
    // if filename is null, derive it from url
    if (!filename) {
      const 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() {
  const printElement = document.querySelector('li[ng-click="printMessage(selectedMessage)"]');
  printElement.click();
}

browser.runtime.onMessage.addListener(handleReceivedMessage);