const express = require('express');
const { chromium } = require('playwright-core');
const fs = require('fs');
const path = require('path');

const app = express();
app.use(express.json({ limit: '50mb' }));

const PORT = 3000;
const CHROMIUM_PATH = '/usr/bin/chromium-browser';

// Arguments Chromium pour environnement restreint (HuggingFace)
const CHROMIUM_ARGS = [
  '--no-sandbox',
  '--disable-setuid-sandbox',
  '--disable-dev-shm-usage',
  '--disable-gpu',
  '--disable-software-rasterizer',
  '--disable-extensions',
  '--disable-background-networking',
  '--disable-sync',
  '--disable-translate',
  '--disable-crash-reporter',
  '--disable-breakpad',
  '--disable-features=TranslateUI',
  '--disable-ipc-flooding-protection',
  '--no-first-run',
  '--no-zygote',
  '--single-process',
  '--deterministic-fetch',
  '--disable-features=IsolateOrigins',
  '--disable-site-isolation-trials',
];

// Devices
const DEVICES = {
  'desktop': { width: 1920, height: 1080 },
  'laptop': { width: 1366, height: 768 },
  'tablet': { width: 768, height: 1024 },
  'mobile': { width: 375, height: 812 },
};

// Formats PDF
const FORMATS = {
  '6x9': { width: '6in', height: '9in' },
  '5x8': { width: '5in', height: '8in' },
  '5.5x8.5': { width: '5.5in', height: '8.5in' },
  '8.5x11': { width: '8.5in', height: '11in' },
  'A4': { width: '210mm', height: '297mm' },
  'A5': { width: '148mm', height: '210mm' },
};

// ==================== HEALTH ====================
app.get('/health', async (req, res) => {
  let browser = null;
  try {
    browser = await chromium.launch({
      executablePath: CHROMIUM_PATH,
      headless: true,
      args: CHROMIUM_ARGS,
    });
    await browser.close();
    res.json({ status: 'ok', chromium: 'working' });
  } catch (error) {
    res.json({ status: 'error', chromium: error.message });
  }
});

// ==================== PDF ====================
app.post('/generate-pdf', async (req, res) => {
  let browser = null;
  const startTime = Date.now();
  
  try {
    const {
      html,
      url,
      format = '6x9',
      margins = { top: '0.75in', bottom: '0.75in', left: '0.5in', right: '0.5in' },
      printBackground = true,
    } = req.body;

    console.log(`[PDF] Starting... format=${format}`);

    if (!html && !url) {
      return res.status(400).json({ error: 'html ou url requis' });
    }

    console.log('[PDF] Launching browser...');
    browser = await chromium.launch({
      executablePath: CHROMIUM_PATH,
      headless: true,
      args: CHROMIUM_ARGS,
    });
    console.log(`[PDF] Browser launched (${Date.now() - startTime}ms)`);

    const page = await browser.newPage();
    console.log(`[PDF] Page created (${Date.now() - startTime}ms)`);

    if (url) {
      console.log(`[PDF] Loading URL: ${url}`);
      await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });
    } else {
      console.log(`[PDF] Setting HTML content (${html.length} chars)`);
      await page.setContent(html, { waitUntil: 'domcontentloaded', timeout: 30000 });
    }
    console.log(`[PDF] Content loaded (${Date.now() - startTime}ms)`);

    // Attendre un peu pour le rendu
    await page.waitForTimeout(1000);

    const formatConfig = FORMATS[format] || FORMATS['6x9'];
    console.log(`[PDF] Generating with format: ${JSON.stringify(formatConfig)}`);

    const pdfBuffer = await page.pdf({
      width: formatConfig.width,
      height: formatConfig.height,
      margin: margins,
      printBackground,
    });
    console.log(`[PDF] Generated! Size: ${pdfBuffer.length} bytes (${Date.now() - startTime}ms)`);

    await browser.close();
    browser = null;

    res.json({
      success: true,
      pdf: pdfBuffer.toString('base64'),
      size_bytes: pdfBuffer.length,
      size_mb: (pdfBuffer.length / 1024 / 1024).toFixed(2),
      duration_ms: Date.now() - startTime,
    });

  } catch (error) {
    console.error(`[PDF] ERROR: ${error.message}`);
    console.error(error.stack);
    if (browser) {
      try { await browser.close(); } catch (e) {}
    }
    res.status(500).json({ 
      error: error.message, 
      stack: error.stack,
      duration_ms: Date.now() - startTime,
    });
  }
});

// ==================== SCREENSHOT ====================
app.post('/screenshot', async (req, res) => {
  let browser = null;
  try {
    const {
      url,
      html,
      device = 'desktop',
      fullPage = true,
      width,
      height,
      selector,
      delay = 0,
    } = req.body;

    if (!url && !html) {
      return res.status(400).json({ error: 'url ou html requis' });
    }

    const deviceConfig = DEVICES[device] || DEVICES['desktop'];
    const viewportWidth = width || deviceConfig.width;
    const viewportHeight = height || deviceConfig.height;

    browser = await chromium.launch({
      executablePath: CHROMIUM_PATH,
      headless: true,
      args: CHROMIUM_ARGS,
    });

    const context = await browser.newContext({
      viewport: { width: viewportWidth, height: viewportHeight },
      isMobile: device.includes('mobile') || device === 'tablet',
      hasTouch: device.includes('mobile') || device === 'tablet',
    });

    const page = await context.newPage();

    if (url) {
      await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });
    } else {
      await page.setContent(html, { waitUntil: 'domcontentloaded' });
    }

    if (delay > 0) {
      await page.waitForTimeout(delay);
    }

    let screenshot;
    if (selector) {
      const element = await page.$(selector);
      if (element) {
        screenshot = await element.screenshot({ type: 'png' });
      } else {
        screenshot = await page.screenshot({ type: 'png', fullPage });
      }
    } else {
      screenshot = await page.screenshot({ type: 'png', fullPage });
    }

    await browser.close();

    res.json({
      success: true,
      screenshot: screenshot.toString('base64'),
      device,
      viewport: { width: viewportWidth, height: viewportHeight },
    });

  } catch (error) {
    console.error(`[SCREENSHOT] ERROR: ${error.message}`);
    if (browser) {
      try { await browser.close(); } catch (e) {}
    }
    res.status(500).json({ error: error.message });
  }
});

// ==================== MULTI-SCREENSHOT ====================
app.post('/multi-screenshot', async (req, res) => {
  let browser = null;
  try {
    const {
      url,
      devices = ['desktop', 'tablet', 'mobile'],
      fullPage = true,
    } = req.body;

    if (!url) {
      return res.status(400).json({ error: 'url requis' });
    }

    browser = await chromium.launch({
      executablePath: CHROMIUM_PATH,
      headless: true,
      args: CHROMIUM_ARGS,
    });

    const screenshots = {};

    for (const device of devices) {
      const deviceConfig = DEVICES[device] || DEVICES['desktop'];

      const context = await browser.newContext({
        viewport: { width: deviceConfig.width, height: deviceConfig.height },
        isMobile: device.includes('mobile') || device === 'tablet',
      });

      const page = await context.newPage();
      await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });

      const screenshot = await page.screenshot({ type: 'png', fullPage });
      screenshots[device] = screenshot.toString('base64');

      await context.close();
    }

    await browser.close();

    res.json({ success: true, screenshots, devices });

  } catch (error) {
    console.error(`[MULTI-SCREENSHOT] ERROR: ${error.message}`);
    if (browser) {
      try { await browser.close(); } catch (e) {}
    }
    res.status(500).json({ error: error.message });
  }
});

// ==================== SCRAPE ====================
app.post('/scrape', async (req, res) => {
  let browser = null;
  try {
    const {
      url,
      device = 'desktop',
      selectors = {},
      waitFor,
      javascript,
    } = req.body;

    if (!url) {
      return res.status(400).json({ error: 'url requis' });
    }

    const deviceConfig = DEVICES[device] || DEVICES['desktop'];

    browser = await chromium.launch({
      executablePath: CHROMIUM_PATH,
      headless: true,
      args: CHROMIUM_ARGS,
    });

    const page = await browser.newPage();
    await page.setViewportSize({ width: deviceConfig.width, height: deviceConfig.height });
    await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });

    if (waitFor) {
      await page.waitForSelector(waitFor, { timeout: 10000 }).catch(() => {});
    }

    const result = {
      url: page.url(),
      title: await page.title(),
    };

    // Extraire avec les sélecteurs
    for (const [key, selector] of Object.entries(selectors)) {
      try {
        result[key] = await page.$$eval(selector, els => els.map(el => ({
          text: el.textContent?.trim(),
          href: el.href || null,
          src: el.src || null,
        })));
      } catch (e) {
        result[key] = [];
      }
    }

    // JavaScript custom
    if (javascript) {
      try {
        result.custom = await page.evaluate(javascript);
      } catch (e) {
        result.custom = { error: e.message };
      }
    }

    await browser.close();
    res.json({ success: true, ...result });

  } catch (error) {
    console.error(`[SCRAPE] ERROR: ${error.message}`);
    if (browser) {
      try { await browser.close(); } catch (e) {}
    }
    res.status(500).json({ error: error.message });
  }
});

// ==================== SCROLL & SCREENSHOT (Alternative à vidéo) ====================
app.post('/scroll-capture', async (req, res) => {
  let browser = null;
  try {
    const {
      url,
      device = 'desktop',
      steps = 5,
      delayBetweenSteps = 500,
    } = req.body;

    if (!url) {
      return res.status(400).json({ error: 'url requis' });
    }

    const deviceConfig = DEVICES[device] || DEVICES['desktop'];

    browser = await chromium.launch({
      executablePath: CHROMIUM_PATH,
      headless: true,
      args: CHROMIUM_ARGS,
    });

    const page = await browser.newPage();
    await page.setViewportSize({ width: deviceConfig.width, height: deviceConfig.height });
    await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30000 });

    const screenshots = [];
    const scrollHeight = await page.evaluate(() => document.body.scrollHeight);
    const stepHeight = scrollHeight / steps;

    for (let i = 0; i <= steps; i++) {
      await page.evaluate((y) => window.scrollTo(0, y), i * stepHeight);
      await page.waitForTimeout(delayBetweenSteps);
      const screenshot = await page.screenshot({ type: 'png' });
      screenshots.push(screenshot.toString('base64'));
    }

    await browser.close();

    res.json({
      success: true,
      screenshots,
      count: screenshots.length,
      device,
    });

  } catch (error) {
    console.error(`[SCROLL-CAPTURE] ERROR: ${error.message}`);
    if (browser) {
      try { await browser.close(); } catch (e) {}
    }
    res.status(500).json({ error: error.message });
  }
});

// ==================== START ====================
app.listen(PORT, '0.0.0.0', () => {
  console.log(`🚀 PDF Server v2 running on port ${PORT}`);
  console.log(`📄 Endpoints: /health, /generate-pdf, /screenshot, /multi-screenshot, /scrape, /scroll-capture`);
});