const FORM_ENDPOINT = "https://form.waitlistpanda.com/go";
const API_ENDPOINT = "https://api.waitlistpanda.com";

const WRAPPER_ID = "WaitlistPanda-wrapper";
const SPINNER_ID = "WaitlistPanda-spinner";
const IFRAME_ID = "WaitlistPanda-form";
const OVERLAY_ID = "WaitlistPanda-overlay";

const FORM_DATA_KEY = "waitlist-id";

async function checkUser(email: string, listId: string) {
  // API on Waitlist panda... Protect this endpoint and only have this endpoint for a given domain.
  const hasAccess = await fetch(
    `${API_ENDPOINT}/lists/${listId}/members/${email}/has_access`
  ).catch((error) => console.log(error));

  return hasAccess;
}

function addGlobalStyles() {
  const styles = `
        @-webkit-keyframes hinge {
            0% {
                opacity: 0;
                -webkit-transform: scale3d(0.8, 0.8, 0.8);
                transform: scale3d(0.8, 0.8, 0.8);
            }
            75% {
                opacity: 1;
                -webkit-transform: scale3d(1.05, 1.05, 1.05);
                transform: scale3d(1.05, 1.05, 1.05);
            }
            100% {
                opacity: 1;
                -webkit-transform: scale3d(1, 1, 1);
                transform: scale3d(1, 1, 1);
            }
        }
        @keyframes hinge {
            0% {
                opacity: 0;
                -webkit-transform: scale3d(0.8, 0.8, 0.8);
                transform: scale3d(0.8, 0.8, 0.8);
            }
            75% {
                opacity: 1;
                -webkit-transform: scale3d(1.05, 1.05, 1.05);
                transform: scale3d(1.05, 1.05, 1.05);
            }
            100% {
                opacity: 1;
                -webkit-transform: scale3d(1, 1, 1);
                transform: scale3d(1, 1, 1);
            }
        }

        @-webkit-keyframes load8 {
            0% {
                -webkit-transform: rotate(0deg);
                transform: rotate(0deg);
            }
            100% {
                -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }
        @keyframes load8 {
            0% {
                -webkit-transform: rotate(0deg);
                transform: rotate(0deg);
            }
            100% {
                -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }

        @-webkit-keyframes wrapperAnimation {
            0% {
                -webkit-transform: rotate(0deg);
                transform: rotate(0deg);
            }
            100% {
                -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }

        @keyframes wrapperAnimation {
            0% {
                opacity: 0;
            }
            100% {
                opacity: 1;
            }
        }

        #${SPINNER_ID},
        #${SPINNER_ID}:after {
            border-radius: 50%;
            width: 50px;
            height: 50px;
        }
        #${SPINNER_ID} {
            margin: 60px auto;
            font-size: 10px;
            position: relative;
            z-index: 2;
            text-indent: -9999em;
            border-top: 7px solid rgba(255, 255, 255, 0.6);
            border-right: 7px solid rgba(255, 255, 255, 0.6);
            border-bottom: 7px solid rgba(255, 255, 255, 0.6);
            border-left: 7px solid #ffffff;
            -webkit-transform: translateZ(0);
            -ms-transform: translateZ(0);
            transform: translateZ(0);
            -webkit-animation: load8 1.1s infinite linear;
            animation: load8 1.1s infinite linear;
        }
    `;
  const styleSheet = document.createElement("style");
  styleSheet.innerText = styles;
  document.head.appendChild(styleSheet);
}

interface PopupOptions {
  showSpinner?: boolean;
}

function showPopup(
  iframe: HTMLIFrameElement,
  options: PopupOptions = { showSpinner: true }
) {
  const wrapper = document.getElementById(WRAPPER_ID) as HTMLIFrameElement;
  const overlay = document.getElementById(OVERLAY_ID) as HTMLIFrameElement;
  const spinner = document.getElementById(SPINNER_ID) as HTMLIFrameElement;

  iframe.style.opacity = "0";
  wrapper.style.display = "flex";
  overlay.style.opacity = "1";
  wrapper.style.animation = "wrapperAnimation 200ms ease-in-out";
  if (options.showSpinner) {
    spinner.style.display = "block";
  }
}

function showIframe(iframe: HTMLIFrameElement) {
  iframe.style.animation = "hinge 400ms ease-in-out";
  iframe.style.opacity = "1";

  const spinner = document.getElementById(SPINNER_ID);
  setTimeout(() => {
    if (spinner) {
      spinner.style.display = "none";
    }
  }, 250);
}

function hideIframe(iframe: HTMLIFrameElement) {
  iframe.style.animation = "";
  iframe.style.opacity = "0";
}

function hidePopup(iframe: HTMLIFrameElement) {
  const wrapper = document.getElementById(WRAPPER_ID) as HTMLIFrameElement;
  const overlay = document.getElementById(OVERLAY_ID) as HTMLIFrameElement;
  const spinner = document.getElementById(SPINNER_ID) as HTMLIFrameElement;

  hideIframe(iframe);
  wrapper.style.animation = "";
  wrapper.style.display = "none";
  overlay.style.opacity = "0";
  spinner.style.display = "none";
}

function createPopup(url: string) {
  var wrapper = document.createElement("div");
  wrapper.style.alignItems = "center";
  wrapper.style.backgroundColor = "100%";
  wrapper.style.display = "flex";
  wrapper.style.height = "100%";
  wrapper.style.justifyContent = "center";
  wrapper.style.left = "0";
  wrapper.style.position = "fixed";
  wrapper.style.top = "0";
  wrapper.style.width = "100%";
  wrapper.style.zIndex = "100";
  wrapper.id = WRAPPER_ID;

  var overlay = document.createElement("div");
  overlay.style.width = "100%";
  overlay.style.height = "100%";
  overlay.style.backgroundColor = "#333333c4";
  overlay.style.position = "absolute";
  overlay.style.inset = "0";
  overlay.style.opacity = "0";
  overlay.style.animation = "";
  overlay.style.zIndex = "1";
  overlay.style.transition = "opacity 0.25s ease-in-out";
  overlay.id = OVERLAY_ID;
  wrapper.appendChild(overlay);

  var spinner = buildLoaderIcon();
  wrapper.appendChild(spinner);

  var ifrm = document.createElement("iframe");
  ifrm.setAttribute("src", url);
  ifrm.allow = "autoplay; clipboard-read; picture-in-picture; clipboard-write";
  ifrm.allowFullscreen = true;
  ifrm.style.maxWidth = "540px";
  ifrm.style.width = "100%";
  ifrm.style.height = "520px";
  ifrm.style.position = "absolute";
  ifrm.style.background = "#fff";
  ifrm.style.zIndex = "3";
  ifrm.style.border = "none";
  ifrm.style.borderRadius = "8px";
  ifrm.style.overflow = "hidden";
  ifrm.style.opacity = "0";
  ifrm.id = IFRAME_ID;
  ifrm.onclose = () => {
  };
  ifrm.onload = () => {
    // console.log("iframe onloaded!");
    showIframe(ifrm);
  };

  wrapper.appendChild(ifrm);

  // Event listenters for the modal
  overlay.onclick = () => {
    const isLoading =
      window.getComputedStyle(spinner, null).display === "block";
    if (!isLoading) {
      hidePopup(ifrm);
    }
  };

  // Add the whole wrapper into the UI...
  document.body.appendChild(wrapper);
  showPopup(ifrm);
  addGlobalStyles();
}

function updateIframeUrl(iframe: HTMLIFrameElement, url: string) {
  iframe.setAttribute("src", url);
}

function hasIframeTargetUrl(iframe: HTMLIFrameElement, url: string) {
  return iframe.src === url;
}

function launchAndCreatePopup(url: string) {
  const popup = document.getElementById(WRAPPER_ID) as HTMLIFrameElement;

  if (popup) {
    const iframe = document.getElementById(IFRAME_ID) as HTMLIFrameElement;

    if (!hasIframeTargetUrl(iframe, url)) {
      showPopup(iframe);
      updateIframeUrl(iframe, url);
    } else {
      showPopup(iframe, { showSpinner: false });
      showIframe(iframe);
    }
  } else {
    createPopup(url);
  }
}

function handleClickButton(event: any, url: string) {
  event.preventDefault();
  launchAndCreatePopup(url)
}

const buildLoaderIcon = () => {
  // const fillColor = "#fff"
  const loaderIcon = document.createElement("div");
  loaderIcon.id = SPINNER_ID;
  return loaderIcon;
};

function getButtons() {
  return document.querySelectorAll(`[data-${FORM_DATA_KEY}]`);
}

function runWaitlistScript() {
  const elements = getButtons();
  elements.forEach((element: any) => {
    const { waitlistId } = element.dataset;
    const listId = waitlistId;
    const formUrl = `${FORM_ENDPOINT}/${listId}`;

    element.onclick = function (event: any) {
      handleClickButton(event, formUrl);
    };
    element.dataset.wlLoaded = "true";
  });
}

function loadScript() {
  // https://stackoverflow.com/a/807997
  // @ts-ignore: Unreachable code error
  if (window.attachEvent as any) {
    // @ts-ignore: Unreachable code error
    window.attachEvent("onload", runWaitlistScript);
  } else {
    if (window.onload) {
      var curronload = window.onload;
      var newonload = (evt: any) => {
        // @ts-ignore: Unreachable code error
        curronload(evt);
        // @ts-ignore: Unreachable code error
        runWaitlistScript(evt);
      };
      window.onload = newonload; // @ts-ignore: Unreachable code error
    } else {
      window.onload = runWaitlistScript;
    }
  }
}

function listenEvents() {
  document.addEventListener("DOMContentLoaded", runWaitlistScript, false);

  if (
    document.readyState === "interactive" ||
    document.readyState === "complete"
  ) {
    runWaitlistScript();
  }
}

function init() {
  if (typeof window === "undefined") {
    return;
  }
  loadScript();
  // Listen events to re-create the popup actions on page change.
  listenEvents();
}

function openPopup(listId: string) {
  const formUrl = `${FORM_ENDPOINT}/${listId}`;
  launchAndCreatePopup(formUrl)
}

export default {
  checkUser,
  init,
  openPopup,
};