"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 enable = this.querySelector('#enable').checked;
  let defaultAction = this.querySelector('#default_action').value;
  let title = this.querySelector('#title').value;
  let title_addl = this.querySelector('#title_addl').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.replaceAll(" ", "");
  let country = this.querySelector("#country").value;
  let allowChangelogMessages = this.querySelector("#showChangelog").checked;
  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,
    enable: enable,
    defaultAction: defaultAction,
    addr__appellation: title,
    addr__title: title_addl,
    addr__firstName: firstName,
    addr__surName: surName,
    addr__email: emailAddress,
    addr__street: streetAddr,
    addr__postcode: postCode,
    addr__placename: placeName,
    addr__country: country,
    pymt__iban: iban,
    pymt__bic: bic,
    showChangelog: allowChangelogMessages,
  };
  // list of options that may be explicitly empty
  const EMPTYABLE_OPTIONS = ["defaultAction"];
  options = Object.fromEntries(Object.entries(options).filter(([k, v]) => v !== "" || EMPTYABLE_OPTIONS.includes(k)))
  console.info("saving", options);

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

}

function boolDefaultTrue(dict, key){
  if (key in dict){
    return dict[key];
  }
  return true;
}

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.info("restoring", settings);
  
  document.querySelector('#enable').checked = boolDefaultTrue(settings, "enable");
  document.querySelector("#bcnum").value = settings.bcnum || "";
  document.querySelector("#birthday").value = settings.bday || "";
  document.querySelector("#default_action").value = settings.defaultAction || "";
  document.querySelector('#title').value = settings.addr__appellation || "";
  document.querySelector('#title_addl').value = settings.addr__title || "";
  document.querySelector('#firstname').value = settings.addr__firstName || "";
  document.querySelector('#surname').value = settings.addr__surName || "";
  document.querySelector('#email').value = settings.addr__email || "";
  document.querySelector('#addr1').value = settings.addr__street || "";
  document.querySelector('#postcode').value = settings.addr__postcode || "";
  document.querySelector('#placename').value = settings.addr__placename || "";
  document.querySelector('#country').value = settings.addr__country || "";
  document.querySelector('#iban').value = settings.pymt__iban || "";
  document.querySelector('#bic').value = settings.pymt__bic || "";
  document.querySelector('#showChangelog').checked = boolDefaultTrue(settings, "showChangelog");
}

let bahncardWindow;

function startBcnumAcquisition(ev) {
  browser.storage.sync.set({ "acquireBahncard": true }).then(() => {
    browser.storage.sync.onChanged.addListener(changes => {
      console.debug(changes);
      for (const [key, changeSet] of Object.entries(changes)) {
        if (key === "bcnum") {
          browser.storage.sync.onChanged.removeListener(this);
        }
      }
    })
    bahncardWindow = window.open("https://www.bahn.de/buchung/kundenkonto/bahncard", "_blank", "popup")
    if (bahncardWindow instanceof Window) {
      bahncardWindow.postMessage("__WINDOW_OPENED_FOR_BC_ACQUISITION__");
    }
  })
}
function startAllAcquisition(ev) {
  browser.storage.sync.set({ "acquireAll": true }).then(() => {
    browser.storage.sync.onChanged.addListener(changes => {
      console.debug(changes);
      if ("acquireAll" in changes) {
        document.location.reload();
      }
    })
    bahncardWindow = window.open("https://www.bahn.de/buchung/kundenkonto/bahncard", "_blank", "popup")
    if (bahncardWindow instanceof Window) {
      bahncardWindow.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)
document.querySelector("#all-get-from-profile").addEventListener("click", startAllAcquisition)