//#region parameters
const env = Object.freeze({
  __lazyXsrfToken: new Lazy(() => document.getElementsByName('__RequestVerificationToken')[0].value),
  get xsrfToken() {
    return this.__lazyXsrfToken.value;
  }
})

const url = Object.freeze({
  reject: `/api/annotation/reject`,
  share: `/api/readonly`
});
//#endregion

//#region request helper methods
function sendRequest(method, url, body = undefined) {
  const options = {
    credentials: 'include',
    method: method,
    headers: {
      'X-XSRF-TOKEN': env.xsrfToken
    }
  }

  if (body !== undefined) {
    options.body = JSON.stringify(body);
    options.headers['Content-Type'] = 'application/json';
  }

  return fetch(url, options);
}

function getRequest(url) {
  return sendRequest('GET', url);
}

function getJson(url) {
  return sendRequest('GET', url).then(res => {
    if (res.ok)
      return res.json();
    throw new Error(`Request failed with status ${res.status}`);
  });
}

function postRequest(url, body = undefined) {
  return sendRequest('POST', url, body);
}

function reload() {
  window.location.reload();
}

function redirect(url) {
  window.location.href = url;
}
//#endregion

//#region envelope
function signEnvelope(annotations) {
  return postRequest(`/api/annotation`, annotations)
}

async function getAnnotationParams(leftInInch = 0, topInInch = 0, inchToPointFactor = 72) {
  const annotParams = await getJson("/api/Config/Annotations");

  for (var key in annotParams) {
    var annot = annotParams[key];
    annot.width *= inchToPointFactor;
    annot.height *= inchToPointFactor;
    annot.left += leftInInch - 0.7;
    annot.left *= inchToPointFactor;
    annot.top += topInInch - 0.5;
    annot.top *= inchToPointFactor;
  }

  return annotParams;
}

function rejectEnvelope(reason) {
  return postRequest(url.reject, reason);
}

function shareEnvelope(receiverMail, dateValid) {
  return postRequest(url.share, { receiverMail: receiverMail, dateValid: dateValid });
}
//#endregion

async function setLanguage(language) {
  const hasLang = await getJson('/api/localization/lang')
    .then(langs => langs.includes(language));

  if (hasLang)
    postRequest(`/api/localization/lang/${language}`)
      .then(response => {
        if (response.redirected)
          redirect(response.url);
      });
}

function logout() {
  return postRequest(`/auth/logout`)
    .then(res => {
      if (res.ok)
        window.location.href = "/";
    });
}