audio-timer/index.html at main · benterris/audio-timer · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Interval Timer with Audio Cues</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/tone/14.7.77/Tone.js"></script>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap" rel="stylesheet">
    <style>
        body {
            font-family: 'Inter', sans-serif;
        }
        button {
            transition: background-color 0.2s ease-in-out, transform 0.1s ease-in-out;
        }
        button:active {
            transform: scale(0.98);
        }
    </style>
</head>
<body class="bg-gray-900 text-white flex items-center justify-center min-h-screen">

    <div class="bg-gray-800 p-8 rounded-2xl shadow-2xl w-full max-w-md text-center space-y-6">
        <h1 class="text-3xl font-bold text-cyan-400">Interval Timer</h1>

        <div class="flex flex-col items-center">
            <label for="duration" class="text-sm font-medium text-gray-400 mb-2">Set Duration (MM:SS)</label>
            <input type="text" id="duration" value="5:00" placeholder="MM:SS" pattern="[0-9]{1,2}:[0-5][0-9]" class="bg-gray-700 text-white text-center w-32 text-lg p-2 rounded-md border border-gray-600 focus:ring-2 focus:ring-cyan-500 focus:outline-none">
        </div>

        <div id="timerDisplay" class="text-7xl font-bold text-gray-100 tracking-wider">
            5:00
        </div>

        <div class="flex justify-center">
            <button id="playPauseBtn" class="bg-cyan-600 hover:bg-cyan-500 text-white font-bold py-3 px-10 rounded-lg shadow-lg text-lg">
                Play
            </button>
        </div>

        <div id="statusMessage" class="text-green-400 h-6"></div>
    </div>

    <script>
        const durationInput = document.getElementById('duration');
        const timerDisplay = document.getElementById('timerDisplay');
        const playPauseBtn = document.getElementById('playPauseBtn');
        const statusMessage = document.getElementById('statusMessage');

        let timerId = null;
        let isPlaying = false;
        let remainingSeconds = 0;
        let lastMinuteNotified = -1;

        const sineSynth = new Tone.Synth({
            oscillator: { type: 'triangle' },
            envelope: { attack: 0.005, decay: 0.1, sustain: 0.3, release: 1 }
        }).toDestination();

        /**
         * Updates the timer display every second.
         */
        function updateTimer() {
            if (remainingSeconds <= 0) {
                clearInterval(timerId);
                playSound(sineSynth, 'C5', '8n', 4, 250); // Play final chime
                statusMessage.textContent = 'Timer complete!';
                resetTimerState();
                return;
            }

            remainingSeconds--;
            displayTime();
            checkAndPlaySounds();
        }

        /**
         * Checks the current time and plays sounds according to the rules.
         */
        function checkAndPlaySounds() {
            const currentMinute = Math.floor(remainingSeconds / 60);
            const currentSecondInMinute = remainingSeconds % 60;

            // When we reach X minutes left (at X:00), a low-pitched tone rings X times.
            if (currentSecondInMinute === 0 && remainingSeconds > 0 && currentMinute !== lastMinuteNotified) {
                const timesToRing = currentMinute;
                lastMinuteNotified = currentMinute; // Mark this minute as notified
                console.log(`Ringing low tone ${timesToRing} times for minute ${currentMinute}`);
                playSound(sineSynth, 'E4', '16n', timesToRing, 500);
            }
            // When we reach X:30, a high-pitched tone rings 2 times.
            else if (currentSecondInMinute === 30) {
                console.log('Ringing high tone 2 times for xx:30.');
                playSound(sineSynth, 'C5', '16n', 2, 200);
            }
            // When we reach X:15 or X:45, the high-pitched tone rings 1 time.
            else if (currentSecondInMinute === 15 || currentSecondInMinute === 45) {
                console.log('Ringing high tone 1 time for xx:15 or xx:45.');
                playSound(sineSynth, 'C5', '16n', 1, 200);
            }
        }

        /**
         * Parses a time string in "MM:SS" format.
         * @param {string} timeString - The string to parse.
         * @returns {number|null} The total seconds, or null if invalid.
         */
        function parseTime(timeString) {
            const parts = timeString.split(':');
            if (parts.length !== 2) return null;

            const minutes = parseInt(parts[0], 10);
            const seconds = parseInt(parts[1], 10);

            if (isNaN(minutes) || isNaN(seconds) || seconds > 59 || seconds < 0 || minutes < 0) {
                return null;
            }

            return (minutes * 60) + seconds;
        }

        /**
         * Toggles the timer between play and pause states.
         */
        function toggleTimer() {
            // Requirement for web audio: start context on a user gesture.
            if (Tone.context.state !== 'running') {
                Tone.start();
                console.log('Audio context started.');
            }

            if (isPlaying) {
                clearInterval(timerId);
                isPlaying = false;
                playPauseBtn.textContent = 'Play';
                playPauseBtn.classList.remove('bg-red-600', 'hover:bg-red-500');
                playPauseBtn.classList.add('bg-cyan-600', 'hover:bg-cyan-500');
                statusMessage.textContent = 'Timer paused.';
            } else {
                // If it's a new start, get the duration from the input
                if (remainingSeconds <= 0 || timerId === null) {
                    const totalSeconds = parseTime(durationInput.value);
                    if (totalSeconds === null || totalSeconds <= 0) {
                        statusMessage.textContent = 'Invalid format. Use MM:SS.';
                        statusMessage.className = 'text-red-400 h-6';
                        return;
                    }
                    remainingSeconds = totalSeconds;
                    lastMinuteNotified = -1;
                }

                displayTime();
                timerId = setInterval(updateTimer, 1000);
                isPlaying = true;
                playPauseBtn.textContent = 'Pause';
                playPauseBtn.classList.remove('bg-cyan-600', 'hover:bg-cyan-500');
                playPauseBtn.classList.add('bg-red-600', 'hover:bg-red-500');
                statusMessage.textContent = 'Timer running...';
            }
        }

        /**
         * Resets the timer state to its initial values.
         */
        function resetTimerState() {
            isPlaying = false;
            timerId = null;
            playPauseBtn.textContent = 'Play';
            playPauseBtn.classList.remove('bg-red-600', 'hover:bg-red-500');
            playPauseBtn.classList.add('bg-cyan-600', 'hover:bg-cyan-500');
            updateDisplayFromInput();
        }

        /**
         * Formats seconds into MM:SS format and updates the display.
         */
        function displayTime() {
            const minutes = Math.floor(remainingSeconds / 60);
            const seconds = remainingSeconds % 60;
            timerDisplay.textContent = `${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
        }

        /**
         * Plays a specified tone a number of times with an interval.
         * @param {Tone.Synth} synth - The Tone.js synth to use.
         * @param {string} note - The note to play (e.g., 'C4').
         * @param {string} duration - The duration of the note (e.g., '8n').
         * @param {number} times - How many times to play the note.
         * @param {number} intervalMs - The interval in milliseconds between notes.
         */
        function playSound(synth, note, duration, times, intervalMs) {
            for (let i = 0; i < times; i++) {
                setTimeout(() => {
                    synth.triggerAttackRelease(note, duration);
                }, i * intervalMs);
            }
        }

        /**
         * Updates the timer display based on the current input value.
         */
        function updateDisplayFromInput() {
            const totalSeconds = parseTime(durationInput.value);

            if (totalSeconds === null) {
                timerDisplay.textContent = "00:00";
                statusMessage.textContent = "Invalid format. Use MM:SS.";
                statusMessage.className = 'text-red-400 h-6';
            } else {
                statusMessage.textContent = "";
                statusMessage.className = 'h-6';
                const minutes = Math.floor(totalSeconds / 60);
                const seconds = totalSeconds % 60;
                timerDisplay.textContent = `${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
            }

            remainingSeconds = 0;
        }


        playPauseBtn.addEventListener('click', toggleTimer);

        durationInput.addEventListener('change', () => {
            if (!isPlaying) {
                resetTimerState();
            }
        });

        window.onload = updateDisplayFromInput;
    </script>
</body>
</html>