const express = require('express');
const { createCanvas, loadImage } = require('canvas');
const helmet = require('helmet');
const rateLimit = require('express-rate-limit')
const bodyParser = require('body-parser');
const path = require('path');
const loadImg = require('./loader');
const app = express();
const { chromium } = require('playwright');
const port = 7860;
app.set('trust proxy', 1);

let totalReq = 0; 

//Brat
const config = {
    maxTextLength: 100,
    viewport: { width: 1920, height: 1080 },
    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36'
};

let browser, page;

const utils = {
    async initialize() {
        if (!browser) {
            browser = await chromium.launch({ headless: true });
            const context = await browser.newContext({
                viewport: config.viewport,
                userAgent: config.userAgent
            });

            await context.route('**/*', (route) => {
                const url = route.request().url();
                if (url.endsWith('.png') || url.endsWith('.jpg') || url.includes('google-analytics')) {
                    return route.abort();
                }
                route.continue();
            });

            page = await context.newPage();
            await page.goto('https://www.bratgenerator.com/', { waitUntil: 'domcontentloaded', timeout: 10000 });

            try {
                await page.click('#onetrust-accept-btn-handler', { timeout: 2000 });
            } catch { }

            await page.evaluate(() => setupTheme('white'));
        }
    },

    async generateBrat(text) {
        await page.fill('#textInput', text);
        const overlay = page.locator('#textOverlay');
        return overlay.screenshot({ timeout: 3000 });
    },

  async close() {
        if (browser) await browser.close();
    }
};

//Security
app.use(helmet());
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 menit
  max: 100, // Membatasi 100 permintaan per IP dalam 15 menit
  message: 'Terlalu banyak permintaan dari IP ini, coba lagi nanti.',
});
app.use(limiter);

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

/**
 * Fungsi untuk menghasilkan gambar status kustom
 * @param {string} profileImage - URL gambar profil
 * @param {string} mainImage - URL gambar utama
 * @param {string} caption - Teks caption
 * @param {number} views - Jumlah tayangan
 * @returns {Promise<Buffer>} - Buffer gambar dalam format PNG
 */
async function createCustomSWGenerator({ profileImage, mainImage, caption = "Custom Caption", views = 4 }) {
  const canvasWidth = 1080;
  const canvasHeight = 1920;
  const canvas = createCanvas(canvasWidth, canvasHeight);
  const ctx = canvas.getContext("2d");

  // Background hitam
  ctx.fillStyle = "#000000";
  ctx.fillRect(0, 0, canvasWidth, canvasHeight);

  // Tambahkan gambar utama
  if (mainImage) {
    try {
      const mainImg = await loadImg(mainImage);
      ctx.drawImage(mainImg, 0, 200, canvasWidth, 1080);
    } catch (error) {
      console.error("Gagal memuat gambar utama:", error.message);
    }
  }

  // Header background
  ctx.fillStyle = "rgba(0, 0, 0, 0.7)";
  ctx.fillRect(0, 0, canvasWidth, 180);

  // Gambar profil dengan border putih
  if (profileImage) {
    try {
      const profileImg = await loadImg(profileImage);
      ctx.save();
      ctx.beginPath();
      ctx.arc(90, 90, 60, 0, Math.PI * 2);
      ctx.closePath();
      ctx.clip();

      // Gambar profil
      ctx.drawImage(profileImg, 30, 30, 120, 120);

      // Garis putih di luar profil
      ctx.beginPath();
      ctx.arc(90, 90, 62, 0, Math.PI * 2); // Radius sedikit lebih besar
      ctx.strokeStyle = "white";
      ctx.lineWidth = 10; // Stroke putih tipis
      ctx.stroke();
      ctx.closePath();
      ctx.restore();
    } catch (error) {
      console.error("Gagal memuat gambar profil:", error.message);
    }
  }

  // Teks header
  ctx.fillStyle = "#FFFFFF";
  ctx.font = "50px 'Roboto Sans', Arial"; // Gunakan Roboto Sans jika tersedia
  ctx.fillText("My status", 180, 80);

  ctx.fillStyle = "#CCCCCC";
  ctx.font = "30px 'Roboto Sans', Arial"; // Gunakan Roboto Sans
  ctx.fillText("Now", 180, 130);

  // Caption teks
  ctx.fillStyle = "#FFFFFF";
  ctx.font = "40px 'Roboto Sans', Arial";
  ctx.textAlign = "center";
  ctx.fillText(caption, canvasWidth / 2, 1400);

  // Footer background
  ctx.fillStyle = "rgba(0, 0, 0, 0.7)";
  ctx.fillRect(0, 1620, canvasWidth, 300);

  // Ikon dan teks footer
  try {
    const viewIcon = await loadImage('./eye.png'); // Ganti dengan URL ikon tayangan
    const shareIcon = await loadImage('./share.png'); // Ganti dengan URL ikon bagikan
    const promoteIcon = await loadImage('./promotion.png'); // Ganti dengan URL ikon promosikan

    // "Tayangan"
    ctx.drawImage(viewIcon, 80, 1660, 70, 70); // Ikon tayangan
    ctx.fillStyle = "#FFFFFF";
    ctx.font = "30px 'Roboto Sans', Arial";
    ctx.textAlign = "center";
    ctx.fillText(`${views} Views`, 170, 1780);

    // "Promosikan"
    ctx.drawImage(promoteIcon, 460, 1660, 70, 70); // Ikon promosikan
    ctx.fillText("Promote", 550, 1780);

    // "Bagikan"
    ctx.drawImage(shareIcon, 840, 1660, 70, 70); // Ikon bagikan
    ctx.fillText("Share", 920, 1780);
  } catch (error) {
    console.error("Gagal memuat ikon:", error.message);
  }

  // Kembalikan gambar sebagai Buffer PNG
  return canvas.toBuffer('image/png');
}

//Threads

async function generateThread(username, avatarPath, textContent, countLike = "100") {
  const canvas = createCanvas(1080, 300);
  const ctx = canvas.getContext('2d');

  // Background putih
  ctx.fillStyle = '#ffffff';
  ctx.fillRect(0, 0, canvas.width, canvas.height);

  // Teks "Utas pertama" dengan ikon bintang di bagian atas kiri
  const starIcon = await loadImage('./star.svg');
  ctx.drawImage(starIcon, 115, 20, 25, 25);
  ctx.font = 'normal 25px Arial';
  ctx.fillStyle = '#888888';
  ctx.fillText('First thread', 145, 40);

  // Titik tiga horizontal
  const dotSize = 8;
  const dotsXStart = canvas.width - 100;
  const dotsY = 110;
  for (let i = 0; i < 3; i++) {
    ctx.beginPath();
    ctx.arc(dotsXStart + i * 20, dotsY, dotSize / 2, 0, Math.PI * 2);
    ctx.fillStyle = '#888888';
    ctx.fill();
  }

  // Load avatar
  const avatar = await loadImg(avatarPath);
  const avatarSize = 80;
  const avatarX = 40;
  const avatarY = 80;

  ctx.save();
  ctx.beginPath();
  ctx.arc(avatarX + avatarSize / 2, avatarY + avatarSize / 2, avatarSize / 2, 0, Math.PI * 2);
  ctx.closePath();
  ctx.clip();
  ctx.drawImage(avatar, avatarX, avatarY, avatarSize, avatarSize);
  ctx.restore();

  // Nama pengguna
  const dUser = username.length > 15 ? username.slice(0, 15) + '...' : username;
  ctx.font = 'bold 30px Arial';
  ctx.fillStyle = '#000000';
  ctx.fillText(dUser, 130, 110);
  const usernameWidth = ctx.measureText(dUser).width;

  // Tulisan 'sekarang'
  ctx.font = 'normal 25px Arial';
  ctx.fillStyle = '#888888';
  ctx.fillText('Now', 130 + usernameWidth + 10, 110);

  // Konten teks
  ctx.font = 'normal 35px Arial';
  ctx.fillStyle = '#000000';
  const maxWidth = canvas.width - 40;
  const lineHeight = 40;
  wrapText(ctx, textContent, 40, 210, maxWidth, lineHeight);

  // Reaksi
  const heart = await loadImage('./heart.svg');
  ctx.drawImage(heart, 45, 250, 35, 35);
  ctx.font = 'normal 25px Arial';
  ctx.fillStyle = '#000000';
  ctx.fillText(countLike, 90, 275);

  return canvas.toBuffer('image/png');
}

// Fungsi untuk membungkus teks panjang
function wrapText(ctx, text, x, y, maxWidth, lineHeight) {
  const words = text.split(' ');
  let line = '';
  for (let n = 0; n < words.length; n++) {
    const testLine = line + words[n] + ' ';
    const metrics = ctx.measureText(testLine);
    const testWidth = metrics.width;
    if (testWidth > maxWidth && n > 0) {
      ctx.fillText(line, x, y);
      line = words[n] + ' ';
      y += lineHeight;
    } else {
      line = testLine;
    }
  }
  ctx.fillText(line, x, y);
}


/**
 * Endpoint untuk membuat gambar status
 * @route POST /generate-status
 * @param {string} profileImage - URL gambar profil
 * @param {string} mainImage - URL gambar utama
 * @param {string} caption - Teks caption
 * @param {number} views - Jumlah tayangan
 * @returns {Buffer} - Gambar dalam format PNG
 */

app.get('/', (req, res) => {
  const documentation = {
    description: 'API documentation for generating image using canvas',
    totalRequest: totalReq,
    endpoints: [
      {
        method: 'POST',
        path: '/generate',
        description: 'Generate a new WhatsApp status with profile image, main image, caption, and views.',
        requestBody: {
          profileImage: 'URL to the profile image',
          mainImage: 'URL to the main image',
          caption: 'Caption for the status',
          views: 'Number of views (integer)',
        },
        exampleRequest: {
          profileImage: 'https://example.com/image.jpg',
          mainImage: 'https://example.com/image2.jpg',
          caption: 'this is the caption!',
          views: 10,
        },
        response: {
          status: 'success',
          ContentType: 'image/png'
        },
      },
      {
        method: 'POST',
        path: '/generate2',
        description: 'Generate treads comments with avatar, username, text, and countLike.',
        requestBody: {
          avatar: 'URL to the profile image',
          username: 'username for profile',
          text: 'main text',
          countLike: 'total like count',
        },
        exampleRequest: {
          avatar: 'https://example.com/image.jpg',
          username: '4rlzyy',
          text: 'this is the main text!',
          countLike: 10,
        },
        response: {
          status: 'success',
          ContentType: 'image/png'
        },
      },
      {
        method: 'GET',
        path: '/brat',
        description: 'Generate brat image using text query.',
        request: {
          text: 'input query'
        },
        exampleRequest: {
          text: 'hii iam usinv brat.'
        },
        response: {
          status: 'success',
          ContentType: 'image/png'
        },
      },
    ],
  };

  res.json(documentation);
});

app.get('/brat', async (req, res) => {
    try {
        const { text } = req.query;
        totalReq++;
      
        // Validasi jika parameter `text` tidak ada
        if (!text || typeof text !== 'string' || text.trim().length === 0) {
            return res.status(400).json({
                message: 'Invalid input. Please provide a valid text query parameter.'
            });
        }

        // Proses pembuatan gambar
        const imageBuffer = await utils.generateBrat(text);

        // Mengirimkan hasil gambar
        res.set('Content-Type', 'image/png');
        res.send(imageBuffer);
    } catch (error) {
        console.error('Error generating brat:', error.message);

        res.status(500).json({
            message: 'An error occurred while generating the brat image.',
            error: error.message
        });
    }
});


app.post('/generate', async (req, res) => {
  const { profileImage, mainImage, caption, views } = req.body;
  totalReq++;

  if (!profileImage || !mainImage) {
    return res.status(400).json({ error: "Gambar profil dan gambar utama harus disediakan." });
  }

  try {
    const imageBuffer = await createCustomSWGenerator({ profileImage, mainImage, caption, views });
    res.setHeader('Content-Type', 'image/png');
    res.send(imageBuffer);
  } catch (error) {
    console.error(error);
    res.status(500).json({ error: "Gagal membuat gambar." });
  }
});

app.post('/generate2', async (req, res) => {
  try {
    const { username, avatar, text, countLike } = req.body;
    totalReq++;

    // Validasi input
    if (!username || !text || !avatar) {
      return res.status(400).json({ error: 'Username, avatar and text are required.' });
    }

    const imageBuffer = await generateThread(username, avatar, text, countLike);

    // Mengirimkan hasil sebagai gambar
    res.setHeader('Content-Type', 'image/png');
    res.send(imageBuffer);
  } catch (error) {
    console.error('Error generating thread:', error);
    res.status(500).json({ error: 'An error occurred while generating the thread.' });
  }
});



// Mulai server Express
app.listen(port, async () => {
  console.log(`Server berjalan di http://localhost:${port}`);
  await utils.initialize();
});

process.on('SIGINT', async () => {
    process.exit(0);
});