Build alarm clock countdown functionality with sound and stop feature

Author: MacDonald91

Sprint-3/alarmclock/alarmclock.js

@@ -1,7 +1,40 @@
-function setAlarm() {}
+function setAlarm() {
+  const input = document.getElementById("alarmSet").value;
+
+  if (!input || input <= 0) {
+    alert("Please enter a valid number");
+    return;
+  }
+
+  let timeRemaining = parseInt(input);
+  const display = document.getElementById("timeRemaining");
+
+  // Show initial time
+  display.textContent = `Time Remaining: 00:${timeRemaining
+    .toString()
+    .padStart(2, "0")}`;
+
+  // Clear any previous timer
+  clearInterval(countdown);
+
+  countdown = setInterval(() => {
+    timeRemaining--;
+
+    display.textContent = `Time Remaining: 00:${timeRemaining
+      .toString()
+      .padStart(2, "0")}`;
+
+    if (timeRemaining === 0) {
+      clearInterval(countdown);
+      playAlarm();
+    }
+  }, 1000);
+}
 
 // DO NOT EDIT BELOW HERE
 
+let countdown; // 👈 needed for timer control
+
 var audio = new Audio("alarmsound.mp3");
 
 function setup() {
@@ -20,6 +53,7 @@ function playAlarm() {
 
 function pauseAlarm() {
   audio.pause();
+  clearInterval(countdown);
 }
 
-window.onload = setup;
+window.onload = setup;