complete set alarm

Author: pathywang

Sprint-3/alarmclock/alarmclock.js

@@ -1,4 +1,34 @@
-function setAlarm() {}
+let countdownInterval = null;
+
+function setAlarm() {
+  const input = document.getElementById("alarmSet");
+  let totalSeconds = parseInt(input.value);
+
+
+  if (countdownInterval) clearInterval(countdownInterval);
+
+  const heading = document.getElementById("timeRemaining");
+
+  function updateHeading() {
+    const minutes = Math.floor(totalSeconds / 60);
+    const seconds = totalSeconds % 60;
+    heading.textContent = `Time Remaining: ${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")}`;
+  }
+
+  updateHeading();
+
+  countdownInterval = setInterval(() => {
+    totalSeconds--;
+
+    if (totalSeconds <= 0) {
+      clearInterval(countdownInterval);
+      playAlarm();
+      totalSeconds = 0; 
+    }
+
+    updateHeading();
+  }, 1000);
+}
 
 // DO NOT EDIT BELOW HERE