1 files changed, 79 insertions, 0 deletions
diff --git a/js/src/countdown.js b/js/src/countdown.js
new file mode 100644
index 00000000..7eaa650c
--- /dev/null
+++ b/js/src/countdown.js
@@ -0,0 +1,79 @@
+"use strict";
+
+(function(){ // Use a closure to avoid polluting global scope
+    // TODO: This needs to be built into the jams system
+    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);
+    }
+})();