Sheffield | ITP-Jan-26 | Hayriye Saricicek | Sprint 3 | alarm clock

Sprint-3/alarmclock/alarmclock.js

@@ -1,25 +1,118 @@
-function setAlarm() {}
+// Only define Audio if it doesn't exist (Node environment)
+if (typeof Audio === "undefined") {
+  // In a Node define a mock Audio class to prevent errors when calling play() and pause()
+  global.Audio = class {
+    // Mock Audio class
+    constructor(src) {
+      // Takes a source for the audio file, but we won't load audio in this mock
+      this.src = src; // stores the source (unused in the mock)
+    }
+    play() {} // no-op in this mock
+    pause() {} // no-op in this mock
+  };
+}
+
+let countdownIntervalId; //stores timer ID so we can clear it when needed
+let alarmRunning = false; // tracks if a countdown is currently active
+
+const formatTime = (seconds) => {
+  // takes a number of seconds and formats it into a string in the format "MM:SS"
+  const minutes = Math.floor(seconds / 60); // calculates whole minutes
+  const remainingSeconds = seconds % 60; // calculates remaining seconds
+  return `${String(minutes).padStart(2, "0")}:${String(remainingSeconds).padStart(2, "0")}`; // formats as MM:SS
+};
+
+function setAlarm() {
+  // called  "Set" button is clicked
+  const alarmInput = document.getElementById("alarmSet"); // gets input for seconds
+  const timerDisplay = document.getElementById("timeRemaining"); // gets element showing remaining time
+
+  // Prevent starting a new alarm if one is already running
+  if (alarmRunning) {
+    alert("Please press Stop before setting a new alarm."); //  ensues user cannot set another alarm without stopping the current one first
+    return;
+  }
+  const seconds = parseInt(alarmInput.value, 10); // converts input value to integer
+
+  if (isNaN(seconds) || seconds < 0) return; // if ignore invalid or negative input
+
+  let remainingSeconds = seconds; // initializes countdown
+
+  timerDisplay.textContent = `Time Remaining: ${formatTime(remainingSeconds)}`; // shows initial time
+
+  if (countdownIntervalId) {
+    clearInterval(countdownIntervalId); // stops previous countdown to prevent multiple timers from running simultaneously
+    countdownIntervalId = null; // resets timer ID
+  }
+
+  if (remainingSeconds === 0) {
+    // if the input is zero, play the alarm immediately without starting a countdown
+    playAlarm();
+    return;
+  }
+
+  alarmRunning = true; // mark that alarm is active
+  countdownIntervalId = setInterval(() => {
+    remainingSeconds--; // decrements remaining time by 1 second
+
+    if (remainingSeconds <= 0) {
+      // when time runs out, clear the timer and play the alarm sound
+      clearInterval(countdownIntervalId); // stops the countdown timer
+      countdownIntervalId = null; // resets timer ID
+      alarmRunning = false; // mark that alarm is no longer active
+      timerDisplay.textContent = "Time Remaining: 00:00"; // shows zero time
+      playAlarm(); // plays alarm sound
+      return; // prevents further execution
+    }
+    timerDisplay.textContent = `Time Remaining: ${formatTime(remainingSeconds)}`; // updates countdown display
+  }, 1000); // repeats every second
+}
+
+window.addEventListener("load", () => {
+  // Add a listener to the Stop button that also clears the timer
+  const stopBtn = document.getElementById("stop");
+
+  stopBtn.addEventListener("click", () => {
+    // stops countdown amd stops audio
+    if (countdownIntervalId) {
+      clearInterval(countdownIntervalId);
+      countdownIntervalId = null;
+    }
+    alarmRunning = false; // mark that alarm is no longer active
+
+    document.getElementById("timeRemaining").textContent =
+      "Time Remaining: 00:00"; // resets display when stopped
+
+    document.getElementById("alarmSet").value = ""; // clears input field when stopped
+    pauseAlarm(); // stop audio if it's playing
+  });
+});
 
 // DO NOT EDIT BELOW HERE
 
 var audio = new Audio("alarmsound.mp3");
 
 function setup() {
+  // This function sets up event listeners for the "Set" and "Stop" buttons when the page loads
   document.getElementById("set").addEventListener("click", () => {
-    setAlarm();
+    // adds a click event listener to the "Set" button that calls the setAlarm function when clicked
+    setAlarm(); // calls the setAlarm function to start the timer when the "Set" button is clicked
   });
 
   document.getElementById("stop").addEventListener("click", () => {
-    pauseAlarm();
+    // adds a click event listener to the "Stop" button that calls the pauseAlarm function when clicked
+    pauseAlarm(); // calls the pauseAlarm function to stop the alarm sound when the "Stop" button is clicked
   });
 }
 
 function playAlarm() {
-  audio.play();
+  // This function plays the alarm sound when called
+  audio.play(); // calls the play method on the audio object to start playing the alarm sound
 }
 
 function pauseAlarm() {
-  audio.pause();
+  // This function pauses the alarm sound when called
+  audio.pause(); // calls the pause method on the audio object to stop playing the alarm sound
 }
 
-window.onload = setup;
+window.onload = setup; // sets the setup function to run when the window finishes loading, ensuring that event listeners are set up properly

Sprint-3/alarmclock/index.html

@@ -1,16 +1,16 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="stylesheet" href="style.css" />
-    <title>Title here</title>
+    <title>Alarm clock app</title>
   </head>
   <body>
     <div class="centre">
       <h1 id="timeRemaining">Time Remaining: 00:00</h1>
       <label for="alarmSet">Set time to:</label>
-      <input id="alarmSet" type="number" />
+      <input id="alarmSet" type="number" min="0" />
 
       <button id="set" type="button">Set Alarm</button>
       <button id="stop" type="button">Stop Alarm</button>