alarm clock function

Author: zilinskyte

Sprint-3/alarmclock/alarmclock.js

@@ -1,19 +1,72 @@
-function setAlarm() {}
+let timer = null;
+let totalSeconds = 0;
 
-// DO NOT EDIT BELOW HERE
+function formatTime(seconds) {
+  const mins = Math.floor(seconds / 60);
+  const secs = seconds % 60;
+  return `${String(mins).padStart(2, "0")}:${String(secs).padStart(2, "0")}`;
+}
 
-var audio = new Audio("alarmsound.mp3");
+function parseInputTime(value) {
+  if (!/^\d{2}:\d{2}$/.test(value)) return null;
+  const [m, s] = value.split(":").map(Number);
+  if (s > 59) return null;
+  return m * 60 + s;
+}
 
-function setup() {
-  document.getElementById("set").addEventListener("click", () => {
-    setAlarm();
-  });
+function updateDisplay() {
+  document.getElementById("alarmSet").value = formatTime(totalSeconds);
+  document.getElementById("timeRemaining").textContent = `Time Remaining: ${formatTime(totalSeconds)}`;
+}
 
-  document.getElementById("stop").addEventListener("click", () => {
-    pauseAlarm();
-  });
+function incrementTime(amount) {
+  totalSeconds += amount;
+  if (totalSeconds < 0) totalSeconds = 0;
+  updateDisplay();
 }
 
+function setAlarm() {
+  const input = document.getElementById("alarmSet");
+  const parsed = parseInputTime(input.value);
+  if (parsed === null) {
+    alert("Use MM:SS format");
+    return;
+  }
+
+  totalSeconds = parsed;
+  updateDisplay();
+
+  if (timer) clearInterval(timer);
+
+  timer = setInterval(() => {
+    totalSeconds--;
+    updateDisplay();
+    if (totalSeconds <= 0) {
+      clearInterval(timer);
+      timer = null;
+      playAlarm();
+    }
+  }, 1000);
+}
+
+function stopTimer() {
+  if (timer) {
+    clearInterval(timer);
+    timer = null;
+  }
+  totalSeconds = 0;
+  updateDisplay();
+  pauseAlarm();
+}
+
+// attach to window so HTML buttons can call them
+window.incrementTime = incrementTime;
+window.setAlarm = setAlarm;
+window.stopTimer = stopTimer;
+
+// DO NOT EDIT BELOW HERE
+var audio = new Audio("alarmsound.mp3");
+
 function playAlarm() {
   audio.play();
 }
@@ -22,4 +75,6 @@ function pauseAlarm() {
   audio.pause();
 }
 
-window.onload = setup;
+window.playAlarm = playAlarm;
+window.pauseAlarm = pauseAlarm;
+