<script>
const WORKER_URL = "worker_suspended.js";
var testUrl2 = "window_suspended.html?page2Shown";

let cacheDataPromise = {};
cacheDataPromise.promise = new Promise(resolve => {
  cacheDataPromise.resolve = resolve;
});
var bcName = location.search.split('?')[1];
var bc = new BroadcastChannel(bcName);
if (bcName == "page1Shown") {
  bc.onmessage = async (msgEvent) => {
    var msg = msgEvent.data;
    var command = msg.command;
    if (command == "startWorker") {
      // Create a worker and subworkers
      let { worker, promise } = postMessageWorker(msg.workerMessage);
      promise.then(function() {
        bc.postMessage({command: "verifyCacheData"});
        return cacheDataPromise.promise;
      })
      .then(function() {
        location.href = testUrl2;
      });
    } else if (command == "changeLocation") {
      cacheDataPromise.resolve();
    } else if (command == "finish") {
      bc.postMessage({command: "finished"});
      bc.close();
      window.close();
    }
  }
} else if (bcName == "page2Shown") {
  bc.onmessage = (msgEvent) => {
    var msg = msgEvent.data;
    var command = msg.command;
    if (command == "startWorker") {
      let { worker, promise } = postMessageWorker(msg.workerMessage);
      promise.then(function() {
        bc.postMessage({command: "verifyCacheData"});
        return cacheDataPromise.promise;
      })
      .then(function() {
        bc.close();
        history.back();
      });
    } else if (command == "goBack") {
      cacheDataPromise.resolve();
    }
  }
}

function postMessageWorker(message) {
  let worker = new window.Worker(WORKER_URL);

  var promise = new Promise((resolve, reject) => {
    // Waiting until workers are ready
    worker.addEventListener("message", function onmessage(msg) {
      bc.postMessage({command: "workerMessage", workerMessage: msg.data});
      worker.removeEventListener("message", onmessage);
      resolve();
    });
    worker.postMessage(message);
  });
  return { worker, promise };
}

onpageshow = function(e) {
  bc.postMessage({command: "onpageshow", persisted: e.persisted, location: location.href});
}
</script>
