<!DOCTYPE html>
<html>
<head>
  <!--
    If you are serving your web app in a path other than the root, change the
    href value below to reflect the base path you are serving from.

    The path provided below has to start and end with a slash "/" in order for
    it to work correctly.

    For more details:
    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base

    This is a placeholder for base href that will be replaced by the value of
    the `--base-href` argument provided to `flutter build`.
  -->
  <base href="$FLUTTER_BASE_HREF">

  <meta charset="UTF-8">
  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
  <meta name="description" content="Datacom Solusindo">

  <!-- iOS meta tags & icons -->
  <meta name="mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="TelNow Application">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <!-- Favicon -->
  <link rel="icon" type="image/png" href="favicon.ico"/>

  <title>TelNow Application</title>
  <link rel="manifest" href="manifest.json">
  <style>
    .loader {
      border: 5px solid #f3f3f3;
      border-radius: 50%;
      border-top: 5px solid #01beb5;
      width: 40px;
      height: 40px;
      -webkit-animation: spin 2s linear infinite; /* Safari */
      animation: spin 2s linear infinite;
    }

    .center {
      position: absolute;
      top: 50%;
      left: 50%;
      margin-top: -60px;
      margin-left: -120px;
      width: 240px;
      height: 40px;
      text-align: center;
      font-family: Arial, Helvetica, sans-serif;
    }

    .center-align {
      position: absolute;
      top: 50%;
      left: 50%;
      margin-top: 20px;
      margin-left: -60px;
      width: 40px;
      height: 40px;
    }

    .center-count {
      position: absolute;
      top: 50%;
      left: 50%;
      margin-top: -30px;
      margin-left: -120px;
      width: 240px;
      height: 40px;
      font-size: 20px;
      font-weight: bold;
      text-align: center;
      font-family: Arial, Helvetica, sans-serif;
    }

    /* Safari */
    @-webkit-keyframes spin {
      0% { -webkit-transform: rotate(0deg); }
      100% { -webkit-transform: rotate(360deg); }
    }

    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    .countdown {
        display: inline-block;
        text-indent: -100vw;
        position:relative;
        width: 1ch;
    }

    .countdown::after {
        content: '10';
        position:absolute;
        top:0;
        left:0;
        text-indent: 0;
        animation: 18s countdown 1s forwards;
    }

    @keyframes countdown {
        0% { content: '10'; }
        10% { content: '9'; }
        20% { content: '8'; }
        30% { content: '7'; }
        35% { content: '7'; }
        40% { content: '6'; }
        45% { content: '6'; }
        50% { content: '5'; }
        55% { content: '5'; }
        60% { content: '4'; }
        65% { content: '4'; }
        70% { content: '3'; }
        75% { content: '2'; }
        80% { content: '2'; }
        85% { content: '2'; }
        90% { content: '1'; }
        95% { content: '1'; }
        100% { content: '0'; }
    }
  </style>
</head>
<body>
  <script src="flutter_bootstrap.js" async></script>

  <div class="center">
    <h4 id="label">Loading TelNow page</h4>
  </div>
  <div class="center-align">
    <img src="cat.gif" width="120" height="120">
  </div>
  <div class="center-count">
    <span class="countdown"></span>
  </div>
  <!-- This script installs service_worker.js to provide PWA functionality to
       application. For more information, see:
       https://developers.google.com/web/fundamentals/primers/service-workers -->
  <script src="https://www.gstatic.com/firebasejs/8.10.1/firebase-app.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.1/firebase-auth.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.1/firebase-messaging.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.1/firebase-firestore.js"></script>

  <script>
    var serviceWorkerVersion = null;
    var scriptLoaded = false;
    function loadMainDartJs() {
      if (scriptLoaded) {
        return;
      }
      scriptLoaded = true;
      var scriptTag = document.createElement('script');
      scriptTag.src = 'main.dart.js';
      scriptTag.type = 'application/javascript';
      document.body.append(scriptTag);
    }

    if ('serviceWorker' in navigator) {
      // Service workers are supported. Use them.
      window.addEventListener('load', function () {
        // Wait for registration to finish before dropping the <script> tag.
        // Otherwise, the browser will load the script multiple times,
        // potentially different versions.
        var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
        navigator.serviceWorker.register(serviceWorkerUrl)
          .then((reg) => {
            function waitForActivation(serviceWorker) {
              serviceWorker.addEventListener('statechange', () => {
                if (serviceWorker.state == 'activated') {
                  console.log('Installed new service worker.');
                  loadMainDartJs();
                }
              });
            }
            if (!reg.active && (reg.installing || reg.waiting)) {
              // No active web worker and we have installed or are installing
              // one for the first time. Simply wait for it to activate.
              waitForActivation(reg.installing || reg.waiting);
            } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
              // When the app updates the serviceWorkerVersion changes, so we
              // need to ask the service worker to update.
              console.log('New service worker available.');
              reg.update();
              waitForActivation(reg.installing);
            } else {
              // Existing service worker is still good.
              console.log('Loading app from service worker.');
              loadMainDartJs();
            }
          });

		navigator.serviceWorker.register("firebase-messaging-sw.js").then((reg) => {
			if (!reg.active && (reg.installing || reg.waiting)) {
              // No active web worker and we have installed or are installing
              // one for the first time. Simply wait for it to activate.
			  console.log('Firebase messaging has been installing.');
            } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
              // When the app updates the serviceWorkerVersion changes, so we
              // need to ask the service worker to update.
              console.log('Firebase messaging is available.');
            } else {
              // Existing service worker is still good.
              console.log('Firebase messaging has been running.');
            }
		});

        // If service worker doesn't succeed in a reasonable amount of time,
        // fallback to plaint <script> tag.
        setTimeout(() => {
          if (!scriptLoaded) {
            console.warn(
              'Failed to load app from service worker. Falling back to plain <script> tag.',
            );
            loadMainDartJs();
          }
        }, 4000);
      });
    } else {
      // Service workers not supported. Just drop the <script> tag.
      loadMainDartJs();
    }

  </script>
</body>
</html>