import puppeteer from 'puppeteer';

const BASE_URL = 'https://manhwaweb.com';

// Configuración de Puppeteer
const PUPPETEER_OPTIONS = {
  headless: 'new',
  args: [
    '--no-sandbox',
    '--disable-setuid-sandbox',
    '--disable-dev-shm-usage',
    '--disable-accelerated-2d-canvas',
    '--disable-gpu'
  ]
};

/**
 * Obtiene el HTML renderizado de una URL usando Puppeteer
 */
async function getRenderedHTML(url, waitFor = 3000) {
  let browser;
  try {
    browser = await puppeteer.launch(PUPPETEER_OPTIONS);
    const page = await browser.newPage();

    // Set user agent
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');

    // Navigate to the URL and wait for network to be idle
    await page.goto(url, {
      waitUntil: 'domcontentloaded',
      timeout: 45000
    });

    // Additional wait to ensure JavaScript content is loaded
    await page.waitForTimeout(waitFor);

    // Get the rendered HTML
    const html = await page.content();

    await browser.close();
    return html;
  } catch (error) {
    if (browser) {
      await browser.close();
    }
    throw error;
  }
}

/**
 * Obtiene la lista de capítulos de un manga desde su página
 * @param {string} mangaSlug - Slug del manga (ej: "one-piece_1695365223767")
 * @returns {Promise<Array>} Lista de capítulos
 */
export async function getMangaChapters(mangaSlug) {
  let browser;
  try {
    const url = `${BASE_URL}/manga/${mangaSlug}`;

    browser = await puppeteer.launch(PUPPETEER_OPTIONS);
    const page = await browser.newPage();
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');

    await page.goto(url, {
      waitUntil: 'domcontentloaded',
      timeout: 45000
    });

    // Wait for content to load
    await new Promise(resolve => setTimeout(resolve, 3000));

    // Extract chapters using page.evaluate
    const chapters = await page.evaluate(() => {
      const chapters = [];

      // Look for links that contain chapter information
      const links = document.querySelectorAll('a[href*="/leer/"]');

      links.forEach(link => {
        const href = link.getAttribute('href');
        const text = link.textContent?.trim();

        if (href && text && href.includes('/leer/')) {
          // Extract chapter number from href
          // Ej: /leer/one-piece_1695365223767-1172
          const match = href.match(/(\d+)(?:\/|\?|\s*$)/);
          const chapterNumber = match ? parseInt(match[1]) : null;

          if (chapterNumber && !isNaN(chapterNumber)) {
            chapters.push({
              number: chapterNumber,
              title: text,
              url: href.startsWith('http') ? href : `https://manhwaweb.com${href}`,
              slug: href.replace('/leer/', '').replace(/^\//, '')
            });
          }
        }
      });

      return chapters;
    });

    await browser.close();

    // Remove duplicates and sort by chapter number (descending)
    const uniqueChapters = chapters
      .filter((chapter, index, self) =>
        index === self.findIndex((c) => c.number === chapter.number)
      )
      .sort((a, b) => b.number - a.number);

    console.log(`✓ Found ${uniqueChapters.length} chapters for ${mangaSlug}`);
    return uniqueChapters;
  } catch (error) {
    if (browser) {
      await browser.close();
    }
    console.error('Error scraping manga chapters:', error.message);
    throw error;
  }
}

/**
 * Obtiene las imágenes de un capítulo específico
 * @param {string} chapterSlug - Slug del capítulo (ej: "one-piece_1695365223767-1172")
 * @returns {Promise<Array>} Lista de URLs de imágenes
 */
export async function getChapterImages(chapterSlug) {
  let browser;
  try {
    const url = `${BASE_URL}/leer/${chapterSlug}`;

    browser = await puppeteer.launch(PUPPETEER_OPTIONS);
    const page = await browser.newPage();
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');

    await page.goto(url, {
      waitUntil: 'domcontentloaded',
      timeout: 45000
    });

    // Wait for images to load
    await new Promise(resolve => setTimeout(resolve, 3000));

    // Extract image URLs
    const images = await page.evaluate(() => {
      const imageUrls = [];
      const images = document.querySelectorAll('img');

      images.forEach(img => {
        let src = img.src || img.getAttribute('data-src');

        if (src) {
          // Convert relative URLs to absolute
          if (!src.startsWith('http')) {
            if (src.startsWith('//')) {
              src = 'https:' + src;
            } else if (src.startsWith('/')) {
              src = 'https://manhwaweb.com' + src;
            }
          }

          // Filter out small UI images
          const alt = img.alt?.toLowerCase() || '';
          const className = img.className?.toLowerCase() || '';

          const isUIElement =
            src.includes('avatar') ||
            src.includes('icon') ||
            src.includes('logo') ||
            src.includes('button') ||
            alt.includes('avatar') ||
            className.includes('avatar') ||
            className.includes('icon');

          if (!isUIElement && src.includes('http')) {
            imageUrls.push(src);
          }
        }
      });

      return imageUrls;
    });

    await browser.close();

    // Remove duplicates while preserving order
    const uniqueImages = [...new Set(images)];

    console.log(`✓ Found ${uniqueImages.length} images for chapter ${chapterSlug}`);
    return uniqueImages;
  } catch (error) {
    if (browser) {
      await browser.close();
    }
    console.error('Error scraping chapter images:', error.message);
    throw error;
  }
}

/**
 * Busca información de un manga específico
 * @param {string} mangaSlug - Slug del manga
 * @returns {Promise<Object>} Información del manga
 */
export async function getMangaInfo(mangaSlug) {
  let browser;
  try {
    const url = `${BASE_URL}/manga/${mangaSlug}`;

    browser = await puppeteer.launch(PUPPETEER_OPTIONS);
    const page = await browser.newPage();
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');

    await page.goto(url, {
      waitUntil: 'domcontentloaded',
      timeout: 45000
    });

    await new Promise(resolve => setTimeout(resolve, 2000));

    // Extract manga information
    const mangaInfo = await page.evaluate(() => {
      // Try to find title
      let title = '';
      const titleElement = document.querySelector('h1') ||
                         document.querySelector('.title') ||
                         document.querySelector('[class*="title"]');
      if (titleElement) {
        title = titleElement.textContent?.trim() || '';
      }

      // If no title found, use page title
      if (!title) {
        title = document.title.replace(' - ManhwaWeb', '').replace(' - Manhwa Web', '').trim();
      }

      // Extract description
      let description = '';
      const descElements = document.querySelectorAll('p');
      for (const p of descElements) {
        const text = p.textContent?.trim() || '';
        if (text.length > 100 && !text.includes('©')) {
          description = text;
          break;
        }
      }

      // Extract genres
      const genres = [];
      const genreLinks = document.querySelectorAll('a[href*="/genero/"]');
      genreLinks.forEach(link => {
        const genre = link.textContent?.trim();
        if (genre) genres.push(genre);
      });

      // Extract status
      let status = 'UNKNOWN';
      const bodyText = document.body.textContent || '';
      const statusMatch = bodyText.match(/Estado\s*:?\s*(PUBLICANDOSE|FINALIZADO|EN PAUSA|EN_ESPERA)/i);
      if (statusMatch) {
        status = statusMatch[1].toUpperCase().replace(' ', '_');
      }

      // Extract cover image
      let coverImage = '';
      const coverImg = document.querySelector('.cover img') ||
                      document.querySelector('[class*="cover"] img') ||
                      document.querySelector('img[alt*="cover"]');
      if (coverImg) {
        coverImage = coverImg.src || '';
      }

      return {
        title,
        description,
        genres,
        status,
        coverImage
      };
    });

    await browser.close();

    return {
      slug: mangaSlug,
      title: mangaInfo.title || 'Unknown',
      description: mangaInfo.description || '',
      genres: mangaInfo.genres || [],
      status: mangaInfo.status,
      url: url,
      coverImage: mangaInfo.coverImage
    };
  } catch (error) {
    if (browser) {
      await browser.close();
    }
    console.error('Error scraping manga info:', error.message);
    throw error;
  }
}

/**
 * Obtiene una lista de mangas populares (para descubrimiento)
 * @returns {Promise<Array>} Lista de mangas populares
 */
export async function getPopularMangas() {
  let browser;
  try {
    const url = `${BASE_URL}/`;

    browser = await puppeteer.launch(PUPPETEER_OPTIONS);
    const page = await browser.newPage();
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');

    await page.goto(url, {
      waitUntil: 'domcontentloaded',
      timeout: 45000
    });

    await new Promise(resolve => setTimeout(resolve, 3000));

    // Extract manga list
    const mangas = await page.evaluate(() => {
      const mangaList = [];
      const links = document.querySelectorAll('a[href*="/manga/"]');

      links.forEach(link => {
        const href = link.getAttribute('href');
        if (href && href.includes('/manga/')) {
          // Extract slug from href
          const slugMatch = href.match(/\/manga\/([^\/\?#]+)/);
          const slug = slugMatch ? slugMatch[1] : null;

          // Extract title
          let title = link.textContent?.trim() ||
                    link.querySelector('img')?.getAttribute('alt') ||
                    slug?.split('_')[0]?.replace(/-/g, ' ');

          if (slug && title && !mangaList.find(m => m.slug === slug)) {
            mangaList.push({
              slug,
              title,
              url: href.startsWith('http') ? href : `https://manhwaweb.com${href}`
            });
          }
        }
      });

      return mangaList;
    });

    await browser.close();

    const limitedMangas = mangas.slice(0, 50);
    console.log(`✓ Found ${limitedMangas.length} popular mangas`);
    return limitedMangas;
  } catch (error) {
    if (browser) {
      await browser.close();
    }
    console.error('Error scraping popular mangas:', error.message);
    throw error;
  }
}