Image UK Driving Licence Generator

async function processImage(originalImg, lastName = "SMITH", firstName = "JOHN", dob = "01 JAN 1990", issueDate = "01.01.2020", expiryDate = "01.01.2030", licenceNumber = "SMITH0123456AB9CD", address = "123 ANY STREET\nANYTOWN\nAN1 2AB", country = "GB") {

    // 1. DYNAMICALLY LOAD FONTS
    // Using Google Fonts for a distinct, official look.
    const oswaldFont = new FontFace('Oswald', 'url(https://fonts.gstatic.com/s/oswald/v49/TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvgUtiYCrY-A.woff2)');
    const dancingScriptFont = new FontFace('Dancing Script', 'url(https://fonts.gstatic.com/s/dancingscript/v24/If2RXTr6YS-zF4S-kcSWSVi_szLviuEViw.woff2)');

    try {
        await Promise.all([oswaldFont.load(), dancingScriptFont.load()]);
        document.fonts.add(oswaldFont);
        document.fonts.add(dancingScriptFont);
    } catch (e) {
        console.error("Font loading failed:", e);
        // Fallback to system fonts if Google Fonts fail to load
        // The rest of the function will still run, but with basic fonts.
    }

    // 2. CANVAS SETUP
    const canvas = document.createElement('canvas');
    const W = 856; // Standard credit card width in pixels (approx 300 DPI)
    const H = 540; // Standard credit card height
    canvas.width = W;
    canvas.height = H;
    const ctx = canvas.getContext('2d');

    // 3. DRAW BACKGROUND & WATERMARKS
    // A subtle gradient background
    const bgGradient = ctx.createLinearGradient(0, 0, W, H);
    bgGradient.addColorStop(0, '#eaf2f8');
    bgGradient.addColorStop(1, '#d2dae2');
    ctx.fillStyle = bgGradient;
    ctx.fillRect(0, 0, W, H);

    // Faint "DVLA" watermark pattern
    ctx.save();
    ctx.font = 'bold 100px "Oswald"';
    ctx.fillStyle = 'rgba(0, 80, 160, 0.04)';
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.translate(W / 2, H / 2);
    ctx.rotate(-Math.PI / 6);
    for (let y = -H; y < H; y += 120) {
        for (let x = -W; x < W; x += 250) {
            ctx.fillText('DVLA', x, y);
        }
    }
    ctx.restore();

    // Semi-transparent "ghost" image of the holder
    ctx.save();
    ctx.globalAlpha = 0.1;
    ctx.drawImage(originalImg, 480, 150, 300, 375);
    ctx.restore();


    // 4. DRAW HEADER ELEMENTS
    // "UK" emblem
    const drawUKCircle = (x, y, radius) => {
        ctx.save();
        ctx.fillStyle = '#012169'; // Royal Blue
        ctx.beginPath();
        ctx.arc(x, y, radius, 0, Math.PI * 2);
        ctx.fill();
        ctx.fillStyle = 'white';
        ctx.font = `bold ${radius * 1.1}px "Oswald"`;
        ctx.textAlign = 'center';
        ctx.textBaseline = 'middle';
        ctx.fillText("UK", x, y + 2);
        ctx.restore();
    };
    drawUKCircle(65, 55, 35);

    // Title text
    ctx.fillStyle = '#012169';
    ctx.font = 'bold 36px "Oswald"';
    ctx.textAlign = 'left';
    ctx.textBaseline = 'top';
    ctx.fillText('DRIVING LICENCE', 260, 20);
    ctx.font = '22px "Oswald"';
    ctx.fillText('UNITED KINGDOM', 260, 65);


    // 5. DRAW MAIN CONTENT
    // Holder's Photo
    ctx.drawImage(originalImg, 40, 120, 180, 230);
    ctx.strokeStyle = '#D40000';
    ctx.lineWidth = 2;
    ctx.strokeRect(40, 120, 180, 230);

    // Reusable function to draw labeled data fields
    const drawField_ = (num, label, value, x, y, options = {}) => {
        ctx.textAlign = 'left';
        ctx.textBaseline = 'top';
        ctx.fillStyle = '#555';
        ctx.font = '14px "Oswald"';
        ctx.fillText(`${num} ${label}`, x, y);
        ctx.fillStyle = options.color || '#000';
        ctx.font = options.font || 'bold 18px "Oswald"';
        ctx.fillText(String(value).toUpperCase(), x, y + 16);
    };

    const dataX = 260;
    const dataY = 120;
    const fieldGapY = 55;

    // Fields 1, 2, 3
    drawField_('1.', 'SURNAME', lastName, dataX, dataY);
    drawField_('2.', 'FIRST NAME(S)', firstName, dataX, dataY + fieldGapY);
    drawField_('3.', 'DATE OF BIRTH / PLACE', `${dob} / ${country}`, dataX, dataY + fieldGapY * 2);

    // Field 4 (Dates & Authority)
    const dateY = dataY + fieldGapY * 3;
    drawField_('4a.', 'DATE OF ISSUE', issueDate, dataX, dateY);
    drawField_('4b.', 'DATE OF EXPIRY', expiryDate, dataX + 220, dateY);
    drawField_('4c.', 'ISSUING AUTHORITY', 'DVLA', dataX + 440, dateY);

    // Field 5 (Licence Number) is prominent
    const lNumFormatted = licenceNumber.replace(/(.{5})(.{6})/, '$1 $2 ');
    drawField_('5.', 'LICENCE NUMBER', lNumFormatted, dataX, dateY + fieldGapY, {
        font: 'bold 24px "Oswald"'
    });
    
    // Field 9 (Categories placeholder)
    drawField_('9.', 'CATEGORIES', 'AM, A, B1, B, f, k, p, q', dataX, dateY + fieldGapY * 2);

    // Signature over the photo
    ctx.save();
    ctx.globalAlpha = 0.9;
    ctx.fillStyle = '#0a2469'; // Blue ink
    ctx.font = '35px "Dancing Script"';
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.fillText(`${firstName} ${lastName}`, 130, 318);
    ctx.restore();

    // Field 8 (Address) at the bottom
    drawField_('8.', 'ADDRESS', '', 40, 420);
    const addressLines = address.split('\n');
    let addrY = 438;
    ctx.fillStyle = '#000';
    ctx.font = '16px "Oswald"';
    for (const line of addressLines) {
        if (line.trim()) {
            ctx.fillText(line.trim().toUpperCase(), 40, addrY);
            addrY += 20;
        }
    }

    return canvas;
}