"use strict;"
function luhnValidate(cardNumber) {
  cardNumber = String(cardNumber).replace(/[\s]/g, "");
  let odd = false;
  let total = 0;
  let position, doubledPos;

  if (!/^[0-9]+$/.test(cardNumber)) {
    return false;
  }

  for (var i = cardNumber.length; i > 0; i--) {
    position = parseInt(cardNumber[i - 1]);
    if (!odd) {
      total += position;
    } else {
      doubledPos = position * 2;

      if (doubledPos > 9) {
        doubledPos -= 9;
      }
      total += doubledPos;
    }
    odd = !odd;
  }

  return (total !== 0 && (total % 10) === 0);
}
function ibanLatinCharId(chr) {
  c = chr.charCodeAt(0);
  if (c > 0x40 && c <= 0x5a) {
    return chr.charCodeAt(0) - 0x40 + 9;
  } else if (c > 0x60 && c <= 0x7a) {
    return chr.charCodeAt(0) - 0x60 + 9;
  }
  return false;
}
function ibanValidate(iban) {
  iban = iban.toUpperCase();
  countryId = iban.slice(0, 2);
  checksum = iban.slice(2, 4);
  countryDigits = countryId.split('').map(ibanLatinCharId).join('');
  body = iban.substring(4);
  processing = `${body}${countryDigits}${checksum}`;
  resultingNumber = BigInt(processing, 10);
  mod = resultingNumber % 97n;
  return mod == 1;

}

function putError(s) {
  document.querySelector('#errors').textContent += s;
}
function clearError() {
  document.querySelector('#errors').textContent = "";
}

async function saveValueIfNotEmpty(k, v) {
  if (v !== "") {
    return browser.storage.sync.set({ k: v })
  }
  return false
}

async function saveOptions(ev) {
  clearError();
  ev.preventDefault();
  let bcNum = this.querySelector("#bcnum").value;
  if (bcNum.length !== 16 || !bcNum.startsWith("70814") || !luhnValidate(bcNum)) {
    putError("Your BahnCard number is not valid. Please make sure you haven't made any typos.");
    return;
  }
  let bDay = this.querySelector('#birthday').value;
  if (bDay == "") {
    putError("Please enter a birthday.");
    return;
  }
  let autoContinue = this.querySelector('#autocontinue').checked;
  let enable = this.querySelector('#enable').checked;
  let title = this.querySelector('#title').value;
  let firstName = this.querySelector('#firstname').value;
  let surName = this.querySelector('#surname').value;
  let emailAddress = this.querySelector('#email').value;
  let streetAddr = this.querySelector('#addr1').value;
  let postCode = this.querySelector('#postcode').value;
  let placeName = this.querySelector('#placename').value;
  let iban = this.querySelector('#iban').value;
  if (iban != "" && !ibanValidate(iban)) {
    putError("Please check your IBAN for typing errors.");
    return;
  }
  let bic = this.querySelector('#bic').value;
  let options = {
    bcnum: bcNum,
    bday: bDay,
    autocontinue: autoContinue,
    enable: enable,
    addr__appellation: title,
    addr__firstName: firstName,
    addr__surName: surName,
    addr__email: emailAddress,
    addr__street: streetAddr,
    addr__postcode: postCode,
    addr__placename: placeName,
    pymt__iban: iban,
    pymt__bic: bic
  };
  options = Object.fromEntries(Object.entries(options).filter(([k, v]) => v !== ""))
  console.log("saving", options);

  browser.storage.sync.set(options).then(() => {
    document.querySelector('#success').textContent = "✔";
    setTimeout(() => {
      document.querySelector('#success').textContent = '';
    }, 5000);
  })

}

async function restoreOptions() {
  // We do not save user data in managed storage.
  // let res = await browser.storage.managed.get('colour');
  // document.querySelector("#managed-colour").innerText = res.colour;

  let settings = await browser.storage.sync.get();
  console.log("restoring", settings);
  document.querySelector('#enable').checked = settings.enable || true;
  document.querySelector("#bcnum").value = settings.bcnum || "";
  document.querySelector("#birthday").value = settings.bday || "";
  document.querySelector("#autocontinue").checked = settings.autocontinue || false;
}

function startBcnumAcquisition(ev) {
  browser.storage.sync.set({"acquireBahncard":true}).then(() => {
    win = window.open("https://www.bahn.de/buchung/kundenkonto/bahncard", "_blank", "popup")
    if (win instanceof Window){
      win.postMessage("__WINDOW_OPENED_FOR_BC_ACQUISITION__");
    }
  })
}

document.addEventListener('DOMContentLoaded', restoreOptions);
document.querySelector("form").addEventListener("submit", saveOptions);
document.querySelector("#bcnum-get-from-profile").addEventListener("click", startBcnumAcquisition)