const netest = require("netest")

const netestOptions = {
   slowSpeedThreshold: 100,
   numOfChecks: 3,
   failIfTooLong: true,
   timeUntilLoadFailure: 60000,
   loadFailureCheckInterval: 2000,
   imageSource: "https://upload.wikimedia.org/wikipedia/commons/b/b9/Pizigani_1367_Chart_1MB.jpg",
   imageSize: 1040
};

netest(netestOptions)
.then((result) => {
   if (!result.isSlow) console.log("Your internet is great!");
})
.catch((error) => {
   if (error.hasFailed) console.log("Too bad, your internet sucks...")
});

let speedCheckInterval = 3*60*1000; // 1 check per 3 minutes

let checkInterval = new BehaviorSubject(speedCheckInterval);
let speedChecks = checkInterval.pipe(
   switchMap(i => interval(i)),
   tap(() => {
      netest(netestOptions)
      .then((result) => { if (!result.isSlow) console.log("Your internet is great!") })
      .catch((error) => { if (error.hasFailed) console.log("Too bad, your internet sucks...") })
      .finally(() => checkInterval.next(speedCheckInterval)); // Reset the timer at end
   })
).subscribe();