piclock/www/scanner.html

<!DOCTYPE html>
<html lang="en">
<title>PiClock NFC Scanner</title>
<link rel="icon" href="favicon.png" type="image/png">
<head>
    <link rel="manifest" href="manifest.json">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <!-- Import digital clock font -->
    <link href="https://fonts.googleapis.com/css2?family=Share+Tech+Mono&display=swap" rel="stylesheet">
    <style>
        /* Global Reset */
        * { box-sizing: border-box; }

        /* Force full screen height */
        html, body {
            height: 100%;
            margin: 0;
            padding: 0;
            overflow: hidden;
            touch-action: none;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            background-attachment: fixed; /* Keeps gradient solid */
        }
        body { 
            display: flex; 
            flex-direction: column; 
            align-items: center; 
            justify-content: center;
            text-align: center;
            color: white;
        }
        
        /* Flex container */
        #display-area { 
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 100%; 
            padding: 20px; 
            padding-bottom: 50px; /* Space for footer */
        }
        
        /* Standard styling for the Employee Name */
        .name { 
            font-size: clamp(1.5rem, 8vw, 5rem); 
            font-weight: 800; 
            margin: 0; 
            line-height: 1.1;
            overflow-wrap: break-word;
            word-wrap: break-word;
            hyphens: auto;
            min-height: 1.2em;
            width: 95%;
            transition: all 0.2s ease;
        }

        /* Giant Dark Green Digital Clock Mode */
        .clock-box {
            font-family: 'Share Tech Mono', monospace;
            background: linear-gradient(145deg, #1b5e20, #0d3312);
            color: #ffffff;
            border-radius: 30px;
            width: 90%;
            max-width: 700px;
            padding: 4vh 2vw;
            font-size: clamp(3.5rem, 18vw, 14rem); 
            white-space: nowrap; 
            font-weight: normal;
            box-shadow: 0 20px 50px rgba(0,0,0,0.6), inset 0 0 15px rgba(255,255,255,0.1);
            text-shadow: 0 5px 15px rgba(0,0,0,0.5);
            letter-spacing: 0.05em;
            margin: 0 auto;
        }
        
        .time { 
            font-size: clamp(1rem, 4vw, 2.5rem); 
            opacity: 0.8; 
            margin-top: 20px;
            min-height: 1.5em;
        }
        
        button { 
            font-size: 1.5rem; 
            padding: 20px 40px; 
            border-radius: 15px; 
            border: none; 
            cursor: pointer; 
            background: #fff;
            color: #1e3c72;
            font-weight: bold;
            margin-top: 40px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.3);
            transition: transform 0.1s;
        }
        button:active { transform: scale(0.95); }
        
        .footer {
            position: absolute;
            bottom: 10px;
            font-size: 0.7rem;
            opacity: 0.6;
            text-align: center;
            width: 100%;
        }
    </style>
</head>
<body>
    <img src="favicon.png" alt="PiClock">
<div id="display-area">
    <div id="name-display" class="name"></div>
    <div id="time-display" class="time"></div>
    <button id="scan-btn" onclick="startScan()">Start NFC Scanner</button>
</div>

<div class="footer">
    Android Chrome NFC Scanner for 'PiClock' <span style="display: inline-block; transform: rotateY(180deg);">&copy;</span> 2026
    <br>made with &hearts; by F.Javier "<a href="mailto:habiwan@me.com" style="color: #fff;">habiwan</a>" Puig Díaz
    <br><img src="habiwan.png" alt="habiwan">
</div>
<script>
let clockInterval;
let resetTimeout;

// --- Debounce & Data Trackers ---
const lastSwipeTimes = new Map();
const swipeNames = new Map();      // Remembers the person's name locally
const swipeLogTimes = new Map();   // Remembers the exact time they logged
const DEBOUNCE_MS = 60000; 

// Function to display the live clock in HH:MM format
function updateClock() {
    const now = new Date();
    const hh = String(now.getHours()).padStart(2, '0');
    const mm = String(now.getMinutes()).padStart(2, '0');
    
    const nameDisplay = document.getElementById('name-display');
    nameDisplay.innerText = `${hh}:${mm}`;
    nameDisplay.className = 'name clock-box'; 
}

async function startScan() {
    const btn = document.getElementById('scan-btn');
    if (document.documentElement.requestFullscreen) {
        document.documentElement.requestFullscreen().catch(err => {
            console.log(`Error attempting to enable full-screen: ${err.message}`);
        });
    }
    const nameDisplay = document.getElementById('name-display');
    const timeDisplay = document.getElementById('time-display');

    if (!('NDEFReader' in window)) {
        nameDisplay.innerText = "Browser Error";
        timeDisplay.innerText = "NFC not supported or not on HTTPS.";
        return;
    }
    
    try {
        const ndef = new NDEFReader();
        await ndef.scan();
        
        btn.style.display = 'none'; 
        
        updateClock();
        clockInterval = setInterval(updateClock, 1000); 
        timeDisplay.innerText = "";

        ndef.onreading = async (event) => {
            const uid = event.serialNumber;
            const now = Date.now();

            // --- Gentle Visual Debounce Logic ---
            if (lastSwipeTimes.has(uid)) {
                const timeSinceLastSwipe = now - lastSwipeTimes.get(uid);
                
                if (timeSinceLastSwipe < DEBOUNCE_MS) {
                    // Fetch the cached name and time (defaults to "User" if it bounced in the very first millisecond)
                    const cachedName = swipeNames.get(uid) || "User";
                    const cachedTime = swipeLogTimes.get(uid) || "";
                    
                    // Stop clock & clear any existing timers
                    clearInterval(clockInterval);
                    clearTimeout(resetTimeout);
                    
                    nameDisplay.className = 'name'; 
                    nameDisplay.innerText = cachedName;
                    timeDisplay.innerText = `Already logged at ${cachedTime}. Please wait 60 seconds.`;
                    
                    // Revert back to clock after 4 seconds
                    resetTimeout = setTimeout(() => {
                        updateClock();
                        clockInterval = setInterval(updateClock, 1000);
                        timeDisplay.innerText = ""; 
                    }, 4000);
                    
                    return; // Block the fetch request to the server
                }
            }
            
            // Record this swipe immediately to prevent multi-bounces while waiting for PHP
            lastSwipeTimes.set(uid, now);
            // -----------------------------------

            const response = await fetch('log_swipe.php', {
                method: 'POST',
                body: JSON.stringify({ uid: uid })
            });
            const data = await response.json();
            
            // Cache the server's response so we can use it if they bounce again in the next 60s
            swipeNames.set(uid, data.name);
            swipeLogTimes.set(uid, data.time);
            
            clearInterval(clockInterval);
            clearTimeout(resetTimeout);
            
            nameDisplay.className = 'name'; 
            nameDisplay.innerText = data.name;
            
            // If the PHP script caught a duplicate (e.g., the browser was refreshed wiping the JS memory)
            if (data.status === 'ignored') {
                timeDisplay.innerText = `Already logged at ${data.time}. Please wait 60 seconds.`;
            } else {
                timeDisplay.innerText = "Logged at " + data.time;
            }
            
            resetTimeout = setTimeout(() => {
                updateClock();
                clockInterval = setInterval(updateClock, 1000);
                timeDisplay.innerText = ""; 
            }, 4000);
        };
    } catch (error) {
        if (error.name === "InvalidStateError") {
            nameDisplay.innerText = "Already Scanning!";
        } else {
            console.error(error);
            nameDisplay.className = 'name'; 
            nameDisplay.innerText = "Scanner Error";
            timeDisplay.innerText = error.message;
        }
    }
}
</script>
</body>
</html>