static/js/countdown.js


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"use strict";

(function(){ // Use a closure to avoid polluting global scope
    const startjam = new Date(Date.UTC(2018, 2, 23));
    const endjam = new Date(Date.UTC(2018, 2, 26));

    const now = Date.now();
    let goal;

    if (now + 1000 < endjam.getTime()) { // Only do anything if the jam hasn't ended
        UIkit.notification( // Spawn the notification
            {
                "message": ""
                  + "<div class='uk-text-center'>"
                  + "    <span id=\"countdown-title\" class=\"uk-text-center\">"
                  + "        <a href=\"/info/jams\">Code Jam</a> Countdown"
                  + "    </span>"
                  + "    <p class='uk-text-large' id=\"countdown-remaining\">...</p>"
                  + "<small style='font-size: 0.6em;'>(Tap/click to dismiss)</small>"
                  + "</div>",
                "pos": "bottom-right",
                "timeout": endjam - now
            }
        );

        const heading = document.getElementById("countdown-title");

        if (now > startjam.getTime()) { // Jam's already started
            heading.innerHTML = "Current <a href=\"/info/jams\">code jam</a> ends in...";
            goal = endjam.getTime();
        } else {
            heading.innerHTML = "Next <a href=\"/info/jams\">code jam</a> starts in...";
            goal = startjam.getTime();
        }

        const refreshCountdown = setInterval(() => { // Create a repeating task
            let delta = goal - Date.now(); // Time until the goal is met

            if (delta <= 1000) { // Goal has been met, best reload
                clearInterval(refreshCountdown);
                return location.reload();
            }

            let days = Math.floor(delta / (24 * 60 * 60 * 1000));
            delta -= days * (24 * 60 * 60 * 1000);

            let hours = Math.floor(delta / (60 * 60 * 1000));
            delta -= hours * (60 * 60 * 1000);

            let minutes = Math.floor(delta / (60 * 1000));
            delta -= minutes * (60 * 1000);

            let seconds = Math.floor(delta / 1000);

            if (days < 10) {
                days = `0${days}`;
            }

            if (hours < 10) {
                hours = `0${hours}`;
            }

            if (minutes < 10) {
                minutes = `0${minutes}`;
            }

            if (seconds < 10) {
                seconds = `0${seconds}`;
            }

            try {
                document.getElementById("countdown-remaining").innerHTML = `${days}:${hours}:${minutes}:${seconds}`;
            } catch (e) { // Notification was probably closed, so we can stop counting
                return clearInterval(refreshCountdown);
            }
        }, 500);
    }
})();