let qrCode = null;
let currentQRText = '';

// Update character count
document.getElementById('inputText').addEventListener('input', function() {
    document.getElementById('textLength').textContent = this.value.length;
});

// Generate QR Code
function generateQR() {
    const text = document.getElementById('inputText').value.trim();
    
    if (!text) {
        alert('❌ Please enter some text or URL');
        return;
    }

    currentQRText = text;
    const size = parseInt(document.getElementById('sizeSelect').value);
    const errorCorrection = document.getElementById('errorSelect').value;

    // Clear previous QR code
    const container = document.getElementById('qrcodeContainer');
    container.innerHTML = '';

    // Generate new QR code
    try {
        qrCode = new QRCode(container, {
            text: text,
            width: size,
            height: size,
            colorDark: '#000000',
            colorLight: '#ffffff',
            correctLevel: QRCode.CorrectLevel[errorCorrection]
        });

        // Show download buttons
        document.getElementById('downloadPNG').style.display = 'block';
        document.getElementById('downloadJPG').style.display = 'block';

        // Update status
        document.getElementById('status').textContent = '✅ QR Code Generated';
        document.getElementById('status').style.color = '#4CAF50';

    } catch (error) {
        alert('❌ Error generating QR code: ' + error.message);
        document.getElementById('status').textContent = '❌ Error generating QR code';
        document.getElementById('status').style.color = '#f44336';
    }
}

// Download QR Code
function downloadQR(format) {
    const canvas = document.querySelector('#qrcodeContainer canvas');
    
    if (!canvas) {
        alert('❌ Please generate QR code first');
        return;
    }

    let link = document.createElement('a');
    
    if (format === 'png') {
        link.download = 'qrcode.png';
        link.href = canvas.toDataURL('image/png');
    } else if (format === 'jpg') {
        link.download = 'qrcode.jpg';
        link.href = canvas.toDataURL('image/jpeg', 0.95);
    }

    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

// Clear all
function clearAll() {
    document.getElementById('inputText').value = '';
    document.getElementById('qrcodeContainer').innerHTML = '';
    document.getElementById('downloadPNG').style.display = 'none';
    document.getElementById('downloadJPG').style.display = 'none';
    document.getElementById('textLength').textContent = '0';
    document.getElementById('status').textContent = 'No QR generated yet';
    document.getElementById('status').style.color = '#666';
    currentQRText = '';
}

// Set example
function setExample(text) {
    document.getElementById('inputText').value = text;
    document.getElementById('textLength').textContent = text.length;
    setTimeout(generateQR, 100);
}

// Allow Enter key to generate
document.getElementById('inputText').addEventListener('keydown', function(e) {
    if (e.ctrlKey && e.key === 'Enter') {
        generateQR();
    }
});