visuals/index.js

const express = require('express');
const { Canvas, loadImage } = require('skia-canvas');
const axios = require('axios'); // For Translation
const app = express();
const multer = require('multer'); // ෆයිල් ගන්න
const { Sticker, StickerTypes } = require('wa-sticker-formatter');
const upload = multer({ storage: multer.memoryStorage() });
app.use(express.json({ limit: '50mb' }));

app.get('/', (req, res) => res.send("🚀 Cipher-MD ULTRA-SHARP ENGINE"));

// ============================================================
// 🎨 1. WELCOME IMAGE GENERATOR (Exact Custom Design)
// ============================================================
app.post('/welcome', upload.single('image'), async (req, res) => {
    try {
        // ෆොටෝ එකක් නැත්නම් එරර් එකක්
        if (!req.file) return res.status(400).send("No Profile Pic Uploaded");

        // බොට්ගෙන් එන ඩේටා (gName = title විදිහට ගන්නවා)
        const { title, count, userName } = req.body;
        const gName = title || "Group Name"; // නම හිස් නම් default එකක්

        const size = 1024;
        const canvas = new Canvas(size, size);
        const ctx = canvas.getContext('2d');
        const watermark = "SYNTIOX VISUAL ENGINE";

        // Style 1 හෝ 3 විතරයි පාවිච්චි කරන්නේ
        const styleId = Math.random() > 0.5 ? 1 : 3;

        // 1. Image Load (Buffer එකෙන් කෙලින්ම ගන්නවා)
        const img = await loadImage(req.file.buffer);

        // 2. Background Blur
        ctx.filter = 'blur(50px) brightness(0.5)';
        ctx.drawImage(img, -50, -50, size + 100, size + 100);
        ctx.filter = 'none';

        // 3. Styles Logic (1 & 3)
        if (styleId === 1) {
            ctx.strokeStyle = 'rgba(0, 242, 255, 0.1)';
            for (let i = 0; i < size; i += 60) {
                ctx.beginPath(); ctx.moveTo(i, 0); ctx.lineTo(i, size); ctx.stroke();
                ctx.beginPath(); ctx.moveTo(0, i); ctx.lineTo(size, i); ctx.stroke();
            }
        } else {
            ctx.strokeStyle = 'rgba(255, 255, 255, 0.2)';
            ctx.lineWidth = 1;
            for (let i = 0; i < 20; i++) {
                ctx.beginPath(); ctx.moveTo(Math.random() * size, Math.random() * size);
                ctx.lineTo(Math.random() * size, Math.random() * size); ctx.stroke();
            }
        }

        // 4. Highlight Beam (උඹේ කෝඩ් එකේ තිබ්බ අලුත් කෑල්ල)
        ctx.save();
        const beamGrad = ctx.createLinearGradient(0, 0, size, size);
        beamGrad.addColorStop(0, 'rgba(0, 242, 255, 0)');
        beamGrad.addColorStop(0.5, 'rgba(0, 242, 255, 0.15)');
        beamGrad.addColorStop(1, 'rgba(0, 242, 255, 0)');
        ctx.fillStyle = beamGrad; ctx.rotate(-15 * Math.PI / 180);
        ctx.fillRect(-size, size / 3, size * 2, 150); ctx.restore();

        // 5. ✅ AVATAR CENTERED (පොටෝ එක හරි මැදට)
        const centerX = size / 2;
        const centerY = size / 2;
        const radius = 250;

        ctx.save();
        ctx.strokeStyle = '#00f2ff'; ctx.lineWidth = 12; ctx.shadowBlur = 40; ctx.shadowColor = '#00f2ff';
        ctx.beginPath(); ctx.arc(centerX, centerY, radius + 15, 0, Math.PI * 2); ctx.stroke(); ctx.restore();

        ctx.save();
        ctx.beginPath(); ctx.arc(centerX, centerY, radius, 0, Math.PI * 2); ctx.clip();
        ctx.drawImage(img, centerX - radius, centerY - radius, radius * 2, radius * 2); ctx.restore();

        // 6. ✅ TEXT LAYOUT
        ctx.textAlign = 'center';

        // "W E L C O M E" Label
        ctx.font = 'bold 60px sans-serif';
        ctx.strokeStyle = 'rgba(0, 242, 255, 0.8)';
        ctx.lineWidth = 3;
        ctx.strokeText("W E L C O M E", centerX, centerY + radius + 120);

        // Group Name & Count
        ctx.fillStyle = 'rgba(255, 255, 255, 0.7)';
        ctx.font = '35px sans-serif';
        // Emoji Safe Regex එකත් දාලා තියෙන්නේ ආරක්ෂාවට
        let safeTitle = gName.replace(/([\u2700-\u27BF]|[\uE000-\uF8FF]|\uD83C[\uDC00-\uDFFF]|\uD83D[\uDC00-\uDFFF]|[\u2011-\u26FF]|\uD83E[\uDD10-\uDDFF])/g, '');
        safeTitle = await translateSinhalaToEnglish(safeTitle);

        ctx.fillText(`${safeTitle} • MEMBER #${count}`, centerX, centerY + radius + 190);

        // User Name (if provided)
        if (userName) {
            let safeUserName = userName.replace(/([\u2700-\u27BF]|[\uE000-\uF8FF]|\uD83C[\uDC00-\uDFFF]|\uD83D[\uDC00-\uDFFF]|[\u2011-\u26FF]|\uD83E[\uDD10-\uDDFF])/g, '');
            safeUserName = await translateSinhalaToEnglish(safeUserName);
            ctx.fillStyle = '#00f2ff';
            ctx.font = 'bold 45px sans-serif';
            ctx.fillText(safeUserName, centerX, centerY + radius + 250);
        }

        // Watermark
        ctx.globalAlpha = 0.3;
        ctx.font = 'bold 25px sans-serif';
        ctx.fillStyle = '#ffffff';
        ctx.fillText(watermark, centerX, size - 30);

        // යැවීම
        const buffer = await canvas.toBuffer('png');
        res.set('Content-Type', 'image/png');
        res.send(buffer);

    } catch (e) {
        console.error(e);
        res.status(500).send("Welcome Gen Error: " + e.message);
    }
});

// ============================================================
// 🖼️ 2. WATERMARK (Only for .img gen)
// ============================================================
app.post('/watermark', upload.single('image'), async (req, res) => {
    try {
        if (!req.file) return res.status(400).send("No image");

        const { watermarkText } = req.body;
        const finalWatermark = watermarkText || 'CIPHER-MD GEN ENGINE';

        const img = await loadImage(req.file.buffer);
        const canvas = new Canvas(img.width, img.height);
        const ctx = canvas.getContext('2d');

        ctx.drawImage(img, 0, 0);

        // Add Watermark
        const fontSize = Math.floor(img.width * 0.02);
        ctx.font = `bold ${fontSize}px sans-serif`;
        ctx.textAlign = 'right';
        ctx.shadowColor = "rgba(0, 0, 0, 0.5)";
        ctx.shadowBlur = 5; ctx.shadowOffsetX = 3; ctx.shadowOffsetY = 3;
        ctx.fillStyle = 'rgba(255, 255, 255, 0.3)';
        ctx.fillText(finalWatermark, img.width - 20, img.height - 20);

        res.set('Content-Type', 'image/png');
        res.send(await canvas.toBuffer('png'));
    } catch (e) { res.status(500).send("WM Error"); }
});

// ============================================================
// 🛠️ HELPER: SINHALA TO ENGLISH TRANSLATION & TRANSLITERATION
// ============================================================
async function translateSinhalaToEnglish(text) {
    if (!text) return text;
    // Check if it has Sinhala characters
    if (!/[\u0D80-\u0DFF]/.test(text)) return text;

    try {
        const url = `https://translate.googleapis.com/translate_a/single?client=gtx&sl=si&tl=en&dt=t&q=${encodeURIComponent(text)}`;
        const res = await axios.get(url);
        let translated = res.data[0][0][0];
        // Capitalize words
        return translated.replace(/\b\w/g, l => l.toUpperCase());
    } catch (e) {
        console.error("Translation API error:", e.message);
        return transliterateSinhala(text);
    }
}

const transliterateSinhala = (text) => {
    if (!text) return text;
    text = text.replace(/\u200D/g, ''); // Remove ZWJ
    const vowels = { 'අ': 'a', 'ආ': 'aa', 'ඇ': 'ae', 'ඈ': 'aae', 'ඉ': 'i', 'ඊ': 'ii', 'උ': 'u', 'ඌ': 'uu', 'එ': 'e', 'ඒ': 'ee', 'ඓ': 'ai', 'ඔ': 'o', 'ඕ': 'oo', 'ඖ': 'au' };
    const consonants = { 'ක': 'k', 'ඛ': 'kh', 'ග': 'g', 'ඝ': 'gh', 'ඞ': 'ng', 'ඟ': 'ng', 'ච': 'ch', 'ඡ': 'chh', 'ජ': 'j', 'ඣ': 'jh', 'ඤ': 'ny', 'ඥ': 'gn', 'ඦ': 'ndj', 'ට': 't', 'ඨ': 'th', 'ඩ': 'd', 'ඪ': 'dh', 'ණ': 'n', 'ඬ': 'nd', 'ත': 't', 'ථ': 'th', 'ද': 'd', 'ධ': 'dh', 'න': 'n', 'ඳ': 'nd', 'ප': 'p', 'ඵ': 'ph', 'බ': 'b', 'භ': 'bh', 'ම': 'm', 'ඹ': 'mb', 'ය': 'y', 'ර': 'r', 'ල': 'l', 'ව': 'v', 'ශ': 'sh', 'ෂ': 'sh', 'ස': 's', 'හ': 'h', 'ළ': 'l', 'ෆ': 'f' };
    const modifiers = { 'ා': 'a', 'ැ': 'ae', 'ෑ': 'aae', 'ි': 'i', 'ී': 'ii', 'ු': 'u', 'ූ': 'uu', 'ෘ': 'ru', 'ෙ': 'e', 'ේ': 'ee', 'ෛ': 'ai', 'ො': 'o', 'ෝ': 'oo', 'ෞ': 'au', '්': '' };
    const specials = { 'ං': 'n', 'ඃ': 'h', 'ෲ': 'ruu' };

    let res = "";
    for (let i = 0; i < text.length; i++) {
        let c = text[i];
        if (vowels[c]) {
            res += vowels[c];
        } else if (specials[c]) {
            res += specials[c];
        } else if (consonants[c]) {
            res += consonants[c];
            if (i + 1 < text.length && modifiers[text[i + 1]] !== undefined) {
                res += modifiers[text[i + 1]];
                i++;
            } else {
                res += "a";
            }
        } else {
            res += c;
        }
    }
    // Capitalize first letter of words to make it look nicer
    return res.replace(/\b\w/g, l => l.toUpperCase());
};

// ============================================================
// 🛠️ HELPER: ROUNDED RECTANGLE
// ============================================================
function roundedRect(ctx, x, y, width, height, radius) {
    ctx.beginPath();
    ctx.moveTo(x + radius, y);
    ctx.lineTo(x + width - radius, y);
    ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
    ctx.lineTo(x + width, y + height - radius);
    ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
    ctx.lineTo(x + radius, y + height);
    ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
    ctx.lineTo(x, y + radius);
    ctx.quadraticCurveTo(x, y, x + radius, y);
    ctx.closePath();
}

// ============================================================
// 📈 ENGINE 1: ULTRA-SHARP LINE CHART (Gold, P2P, CSE)
// ============================================================
async function drawLineChart(title, subTitle, history, colorTheme) {
    const width = 2400;
    const height = 1500;
    const canvas = new Canvas(width, height);
    const ctx = canvas.getContext('2d');

    ctx.scale(2, 2);
    // 1. Background (Solid Dark)
    ctx.fillStyle = '#131722';
    ctx.fillRect(0, 0, width, height);

    // 📐 Precise Layout Calculation
    // යට ඉඩ (Bottom Padding) වැඩි කළා අකුරු ගෑවෙන්නෙ නැති වෙන්න
    const chartX = 20;
    const chartY = 120; // Title area height
    const chartW = 1050;
    const chartH = 530; // Chart height reduced slightly to keep bottom clear

    // Data Min/Max
    const values = history.map(h => (h.price || h.rate || h.value));
    const minVal = Math.min(...values) * 0.9995;
    const maxVal = Math.max(...values) * 1.0005;
    const range = maxVal - minVal;

    const getY = (val) => chartY + chartH - ((val - minVal) / range) * chartH;
    const getX = (i) => chartX + (i / (values.length - 1)) * chartW;

    // 2. GRID LINES (Very Subtle)
    ctx.lineWidth = 1;
    ctx.strokeStyle = '#2a2e39';

    // Horizontal Grids
    const rows = 6;
    for (let i = 0; i <= rows; i++) {
        const y = chartY + (chartH / rows) * i;
        ctx.beginPath(); ctx.moveTo(chartX, y); ctx.lineTo(chartX + chartW, y); ctx.stroke();

        // Price Label (Sharp Font)
        const price = maxVal - (range / rows) * i;
        ctx.fillStyle = '#787b86';
        ctx.font = '13px Consolas, monospace'; // Monospace for alignment
        ctx.textAlign = 'left';
        ctx.fillText(price.toLocaleString(undefined, { minimumFractionDigits: 2 }), chartX + chartW + 12, y + 8);
    }

    // Vertical Grids
    const cols = 8;
    for (let i = 0; i <= cols; i++) {
        const x = chartX + (chartW / cols) * i;
        ctx.beginPath(); ctx.moveTo(x, chartY); ctx.lineTo(x, chartY + chartH + 60); ctx.stroke();
    }

    // 3. THE CHART AREA (Clean Gradient)
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(getX(0), getY(values[0]));
    for (let i = 0; i < values.length; i++) ctx.lineTo(getX(i), getY(values[i]));

    // Close path to bottom of chart area
    ctx.lineTo(getX(values.length - 1), chartY + chartH + 60);
    ctx.lineTo(getX(0), chartY + chartH + 60);
    ctx.closePath();

    // Sharp Gradient (No blurring at bottom)
    const gradient = ctx.createLinearGradient(0, chartY, 0, chartY + chartH + 60);
    gradient.addColorStop(0, `${colorTheme}55`); // Top: Semi-transparent
    gradient.addColorStop(1, `${colorTheme}00`); // Bottom: Completely transparent
    ctx.fillStyle = gradient;
    ctx.fill();
    ctx.restore();

    // 4. THE MAIN LINE (Thin & Sharp)
    ctx.beginPath();
    ctx.lineWidth = 3; // Thinner line for "Pro" look (was 5)
    ctx.strokeStyle = colorTheme;
    ctx.lineJoin = 'round';
    // Removed shadowBlur here to avoid "smudge" look
    for (let i = 0; i < values.length; i++) {
        if (i === 0) ctx.moveTo(getX(i), getY(values[i]));
        else ctx.lineTo(getX(i), getY(values[i]));
    }
    ctx.stroke();

    // 5. CURRENT PRICE BADGE (Right Axis)
    const lastVal = values[values.length - 1];
    const lastY = getY(lastVal);

    // Dotted line to axis
    ctx.setLineDash([2, 2]);
    ctx.lineWidth = 1;
    ctx.beginPath(); ctx.moveTo(getX(values.length - 1), lastY); ctx.lineTo(chartX + chartW, lastY); ctx.stroke();
    ctx.setLineDash([]);

    // Badge
    ctx.fillStyle = colorTheme;
    roundedRect(ctx, chartX + chartW + 5, lastY - 11, 115, 22, 3);
    ctx.fill();

    ctx.fillStyle = '#ffffff';
    ctx.font = 'bold 13px Consolas';
    ctx.textAlign = 'left';
    ctx.fillText(lastVal.toLocaleString(undefined, { minimumFractionDigits: 2 }), chartX + chartW + 10, lastY + 5);

    // Pulsing Dot (Sharp)
    const lastX = getX(values.length - 1);
    ctx.beginPath(); ctx.arc(lastX, lastY, 5, 0, Math.PI * 2); ctx.fillStyle = '#ffffff'; ctx.fill();
    ctx.beginPath(); ctx.arc(lastX, lastY, 12, 0, Math.PI * 2); ctx.strokeStyle = `${colorTheme}66`; ctx.lineWidth = 2; ctx.stroke();

    // 6. HEADER (Aligned)
    ctx.fillStyle = '#ffffff'; ctx.font = 'bold 42px sans-serif'; ctx.textAlign = 'left';
    ctx.fillText(title, 30, 60);

    ctx.fillStyle = colorTheme; ctx.font = 'bold 32px sans-serif';
    ctx.fillText(subTitle, 30, 100);

    // 7. WATERMARK (Safe Distance)
    ctx.fillStyle = 'rgba(255, 255, 255, 0.1)'; ctx.font = '18px sans-serif'; ctx.textAlign = 'right';
    ctx.fillText('⚡ Cipher-MD Analytics (4K)', (width / 2) - 20, (height / 2) - 20);

    return canvas.toBuffer('png');
}

// ============================================================
// 🕯️ ENGINE 2: CANDLESTICK CHART (Fixed Sharpness)
// ============================================================
app.post('/chart/candle', async (req, res) => {
    try {
        const { candles, symbol, change, currentPrice } = req.body;
        const width = 2400;
        const height = 1500;
        const canvas = new Canvas(width, height);
        const ctx = canvas.getContext('2d');

        ctx.scale(2, 2);
        ctx.fillStyle = '#131722'; ctx.fillRect(0, 0, width, height);

        const chartX = 20;
        const chartY = 60;
        const chartW = 1050;
        const chartH = 530;

        const minPrice = Math.min(...candles.map(c => c.low));
        const maxPrice = Math.max(...candles.map(c => c.high));
        const range = maxPrice - minPrice;
        const maxVol = Math.max(...candles.map(c => c.volume));
        const getY = (p) => chartY + chartH - ((p - minPrice) / range) * chartH;

        // Grid
        ctx.lineWidth = 1; ctx.strokeStyle = '#2a2e39';
        const rows = 8;
        for (let i = 0; i <= rows; i++) {
            const y = chartY + (chartH / rows) * i;
            ctx.beginPath(); ctx.moveTo(chartX, y); ctx.lineTo(chartX + chartW, y); ctx.stroke();
            const p = maxPrice - (range / rows) * i;
            ctx.fillStyle = '#787b86'; ctx.textAlign = 'left'; ctx.font = '13px Consolas';
            ctx.fillText(p.toFixed(2), chartX + chartW + 10, y + 4);
        }

        const candleW = (chartW / candles.length) * 0.7;
        const spacing = chartW / candles.length;

        candles.forEach((c, i) => {
            const x = chartX + (i * spacing) + (spacing / 2);
            const isUp = c.close >= c.open;
            const color = isUp ? '#089981' : '#f23645';

            // Volume (Sharp, low opacity)
            const volH = (c.volume / maxVol) * 120;
            ctx.fillStyle = isUp ? 'rgba(8, 153, 129, 0.2)' : 'rgba(242, 54, 69, 0.2)';
            ctx.fillRect(x - candleW / 2, chartY + chartH - volH + 150, candleW, volH);

            // Wick (Thin line)
            ctx.strokeStyle = color; ctx.lineWidth = 1.5;
            ctx.beginPath(); ctx.moveTo(x, getY(c.high)); ctx.lineTo(x, getY(c.low)); ctx.stroke();

            // Body
            ctx.fillStyle = color;
            const yOpen = getY(c.open);
            const yClose = getY(c.close);
            ctx.fillRect(x - candleW / 2, Math.min(yOpen, yClose), candleW, Math.max(Math.abs(yOpen - yClose), 1));
        });

        // Price Badge
        const lastC = candles[candles.length - 1];
        const lastY = getY(lastC.close);
        const lastColor = lastC.close >= lastC.open ? '#089981' : '#f23645';

        ctx.strokeStyle = '#ffffff'; ctx.setLineDash([2, 2]); ctx.lineWidth = 1;
        ctx.beginPath(); ctx.moveTo(0, lastY); ctx.lineTo(chartX + chartW, lastY); ctx.stroke();
        ctx.setLineDash([]);

        ctx.fillStyle = lastColor;
        roundedRect(ctx, chartX + chartW + 5, lastY - 12, 115, 24, 3); ctx.fill();
        ctx.fillStyle = '#ffffff'; ctx.font = 'bold 13px Consolas';
        ctx.fillText(parseFloat(currentPrice).toFixed(2), chartX + chartW + 10, lastY + 5);

        // Header
        ctx.fillStyle = '#ffffff'; ctx.font = 'bold 42px sans-serif'; ctx.textAlign = 'left';
        ctx.fillText(`${symbol} / USDT`, 30, 60);
        ctx.fillStyle = parseFloat(change) >= 0 ? '#089981' : '#f23645'; ctx.font = 'bold 32px sans-serif';
        ctx.fillText(`${change}%`, 30, 100);

        ctx.fillStyle = 'rgba(255, 255, 255, 0.1)'; ctx.font = '18px sans-serif'; ctx.textAlign = 'right';
        ctx.fillText('⚡ Cipher-MD Analytics', (width / 2) - 20, (height / 2) - 20);

        res.set('Content-Type', 'image/png'); res.send(await canvas.toBuffer('png'));
    } catch (e) { res.status(500).send(e.message); }
});

// ============================================================
// 💎 ENGINE 3: NFT & ARB (Retained Fixed Version)
// ============================================================
app.post('/chart/nft', async (req, res) => {
    try {
        const { data } = req.body;
        const canvas = new Canvas(800, 400); const ctx = canvas.getContext('2d');
        ctx.fillStyle = '#0a0b0d'; roundedRect(ctx, 0, 0, 800, 400, 25); ctx.fill();

        if (data.image_url) {
            try {
                const img = await loadImage(data.image_url);
                ctx.save(); ctx.beginPath(); roundedRect(ctx, 40, 40, 200, 200, 20); ctx.clip();
                ctx.drawImage(img, 40, 40, 200, 200); ctx.restore();
            } catch (e) { }
        }

        ctx.fillStyle = '#ffffff'; ctx.font = 'bold 36px sans-serif';
        ctx.fillText(data.name.substring(0, 18), 270, 70);

        ctx.fillStyle = '#8a939b'; ctx.font = '24px sans-serif';
        ctx.fillText(`Chain: ${data.chain.toUpperCase()}`, 270, 110);

        ctx.fillStyle = '#2081e2'; ctx.font = 'bold 55px sans-serif';
        ctx.fillText(`${data.floor_price} ${data.floor_price_symbol}`, 270, 190);

        ctx.fillStyle = '#ffffff'; ctx.font = '18px sans-serif';
        ctx.fillText('FLOOR PRICE', 270, 220);

        ctx.fillStyle = '#161b22'; roundedRect(ctx, 270, 260, 480, 80, 15); ctx.fill();

        ctx.fillStyle = '#ffffff'; ctx.font = 'bold 20px sans-serif';
        ctx.textAlign = 'left'; ctx.fillText(`Vol: ${Math.round(data.total_volume)}`, 290, 308);
        ctx.textAlign = 'right'; ctx.fillText(`Owners: ${data.owner_count}`, 730, 308);

        ctx.textAlign = 'right'; ctx.fillStyle = 'rgba(255,255,255,0.2)';
        ctx.fillText('Cipher-MD NFT', 750, 380);

        res.set('Content-Type', 'image/png'); res.send(await canvas.toBuffer('png'));
    } catch (e) { res.status(500).send(e.message); }
});

app.post('/chart/arb', async (req, res) => {
    try {
        const { coin, exData } = req.body;
        const canvas = new Canvas(900, 600); const ctx = canvas.getContext('2d');
        ctx.fillStyle = '#131722'; ctx.fillRect(0, 0, 900, 600);

        ctx.fillStyle = '#ffffff'; ctx.font = 'bold 40px sans-serif';
        ctx.fillText(`${coin} Arbitrage Monitor`, 40, 60);

        let y = 120;
        const avg = exData.reduce((a, b) => a + b.price, 0) / exData.length;

        exData.forEach(ex => {
            const diff = (((ex.price - avg) / avg) * 100);
            const color = diff >= 0 ? '#089981' : '#f23645';

            ctx.fillStyle = '#1e222d'; roundedRect(ctx, 40, y, 820, 70, 10); ctx.fill();

            ctx.fillStyle = '#b2b5be'; ctx.textAlign = 'left'; ctx.font = 'bold 24px sans-serif';
            ctx.fillText(ex.name, 70, y + 45);

            ctx.fillStyle = '#ffffff'; ctx.textAlign = 'right';
            ctx.fillText(`$${ex.price.toLocaleString()}`, 600, y + 45);

            ctx.fillStyle = color;
            ctx.fillText(`${diff > 0 ? '+' : ''}${diff.toFixed(2)}%`, 830, y + 45);
            y += 85;
        });

        res.set('Content-Type', 'image/png'); res.send(await canvas.toBuffer('png'));
    } catch (e) { res.status(500).send(e.message); }
});

// ============================================================
// ⚡ ROUTERS
// ============================================================
app.post('/chart/p2p', async (req, res) => {
    try {
        const { history, currentRate } = req.body;
        const buf = await drawLineChart("USDT / LKR (P2P)", `Rs. ${currentRate}`, history, '#2962ff');
        res.set('Content-Type', 'image/png'); res.send(buf);
    } catch (e) { res.status(500).send(e.message); }
});

app.post('/chart/forex', async (req, res) => {
    try {
        const { history, currentRate } = req.body;
        const buf = await drawLineChart("USD / LKR (Official)", `Rs. ${currentRate}`, history, '#089981');
        res.set('Content-Type', 'image/png'); res.send(buf);
    } catch (e) { res.status(500).send(e.message); }
});

app.post('/chart/gold', async (req, res) => {
    try {
        const { history, currentRate } = req.body;
        const buf = await drawLineChart("Gold (24K)", `Rs. ${currentRate}`, history, '#f2a900');
        res.set('Content-Type', 'image/png'); res.send(buf);
    } catch (e) { res.status(500).send(e.message); }
});

app.post('/chart/cse', async (req, res) => {
    try {
        const { history, currentRate } = req.body;
        const buf = await drawLineChart("CSE ASPI", `${currentRate}`, history, '#a300cc');
        res.set('Content-Type', 'image/png'); res.send(buf);
    } catch (e) { res.status(500).send(e.message); }
});

app.post('/chart/fear', async (req, res) => {
    try {
        const { history } = req.body;
        const last = history[history.length - 1].value;
        const color = last > 50 ? '#089981' : '#f23645';
        const buf = await drawLineChart("Fear & Greed", `${last}/100`, history, color);
        res.set('Content-Type', 'image/png'); res.send(buf);
    } catch (e) { res.status(500).send(e.message); }
});

const port = 7861;
app.listen(port, () => console.log(`🚀 ULTRA-SHARP ENGINE running on port ${port}`));