const express = require('express');
const router = express.Router();
const multer = require('multer');
const sharp = require('sharp');
const path = require('path');
const fs = require('fs').promises;
const { body, validationResult } = require('express-validator');
const { User, Portfolio, Service, Contact, SiteSettings, Banner } = require('../models');

// Configure multer for file uploads
const storage = multer.memoryStorage(); // Use memory storage to process with sharp
const upload = multer({ 
  storage,
  limits: { fileSize: 10 * 1024 * 1024 }, // 10MB limit
  fileFilter: (req, file, cb) => {
    if (file.mimetype.startsWith('image/')) {
      cb(null, true);
    } else {
      cb(new Error('Only image files are allowed'), false);
    }
  }
});

// Authentication middleware
const requireAuth = (req, res, next) => {
  if (!req.session.user) {
    return res.redirect('/admin/login');
  }
  next();
};

// Add stats middleware
const addStats = async (req, res, next) => {
  try {
    if (req.session.user) {
      const [portfolioCount, servicesCount, contactsCount] = await Promise.all([
        Portfolio.count({ where: { isPublished: true } }),
        Service.count({ where: { isActive: true } }),
        Contact.count()
      ]);

      res.locals.stats = {
        portfolioCount,
        servicesCount,
        contactsCount
      };
    }
    next();
  } catch (error) {
    console.error('Stats middleware error:', error);
    next();
  }
};

// Admin login page
router.get('/login', (req, res) => {
  if (req.session.user) {
    return res.redirect('/admin/dashboard');
  }
  
  res.render('admin/login', {
    title: 'Admin Login',
    error: null
  });
});

// Admin login POST
router.post('/login', async (req, res) => {
  try {
    const { email, password } = req.body;
    
    const user = await User.findOne({ 
      where: { 
        email: email, 
        isActive: true 
      } 
    });
    if (!user || !(await user.comparePassword(password))) {
      return res.render('admin/login', {
        title: 'Admin Login',
        error: 'Invalid credentials'
      });
    }

    await user.updateLastLogin();
    
    req.session.user = {
      id: user.id,
      email: user.email,
      name: user.name,
      role: user.role
    };

    res.redirect('/admin/dashboard');
  } catch (error) {
    console.error('Admin login error:', error);
    res.render('admin/login', {
      title: 'Admin Login',
      error: 'Server error'
    });
  }
});

// Admin logout
router.post('/logout', (req, res) => {
  req.session.destroy(err => {
    if (err) {
      console.error('Logout error:', err);
    }
    res.redirect('/admin/login');
  });
});

// Dashboard (default route)
router.get('/', requireAuth, async (req, res) => {
  res.redirect('/admin/dashboard');
});

// Dashboard
router.get('/dashboard', requireAuth, async (req, res) => {
  try {
    const [
      portfolioCount,
      servicesCount,
      contactsCount,
      recentContacts,
      recentPortfolio
    ] = await Promise.all([
      Portfolio.count({ where: { isPublished: true } }),
      Service.count({ where: { isActive: true } }),
      Contact.count(),
      Contact.findAll({ 
        order: [['createdAt', 'DESC']], 
        limit: 5 
      }),
      Portfolio.findAll({ 
        where: { isPublished: true },
        order: [['createdAt', 'DESC']], 
        limit: 5 
      })
    ]);

    const stats = {
      portfolioCount: portfolioCount,
      servicesCount: servicesCount,
      contactsCount: contactsCount,
      usersCount: await User.count()
    };

    res.render('admin/dashboard', {
      title: 'Admin Dashboard',
      layout: 'admin/layout',
      user: req.session.user,
      stats,
      recentContacts,
      recentPortfolio,
      currentPage: 'dashboard'
    });
  } catch (error) {
    console.error('Dashboard error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading dashboard'
    });
  }
});

// Banner management
router.get('/banners', requireAuth, async (req, res) => {
  try {
    const page = parseInt(req.query.page) || 1;
    const limit = 20;
    const skip = (page - 1) * limit;

    const [banners, total] = await Promise.all([
      Banner.findAll({
        order: [['order', 'ASC'], ['createdAt', 'DESC']],
        offset: skip,
        limit: limit
      }),
      Banner.count()
    ]);

    const totalPages = Math.ceil(total / limit);

    res.render('admin/banners/list', {
      title: 'Banner Management - Admin Panel',
      layout: 'admin/layout',
      user: req.session.user,
      banners,
      pagination: {
        current: page,
        total: totalPages,
        hasNext: page < totalPages,
        hasPrev: page > 1
      }
    });
  } catch (error) {
    console.error('Banner list error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading banners'
    });
  }
});

// Add banner
router.get('/banners/add', requireAuth, (req, res) => {
  res.render('admin/banners/add', {
    title: 'Add Banner - Admin Panel',
    layout: 'admin/layout',
    user: req.session.user,
    positions: [
      { value: 'hero', label: '메인 히어로' },
      { value: 'secondary', label: '보조 배너' },
      { value: 'footer', label: '푸터 배너' }
    ],
    animations: [
      { value: 'none', label: '없음' },
      { value: 'fade', label: '페이드' },
      { value: 'slide', label: '슬라이드' },
      { value: 'zoom', label: '줌' }
    ]
  });
});

// Create banner
router.post('/banners/add', requireAuth, [
  body('title').notEmpty().withMessage('제목을 입력해주세요'),
  body('position').isIn(['hero', 'secondary', 'footer']).withMessage('유효한 위치를 선택해주세요'),
  body('order').isInt({ min: 0 }).withMessage('유효한 순서를 입력해주세요')
], async (req, res) => {
  try {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: '입력 데이터를 확인해주세요',
        errors: errors.array()
      });
    }

    const {
      title,
      subtitle,
      description,
      buttonText,
      buttonUrl,
      image,
      mobileImage,
      position,
      order,
      isActive = true,
      startDate,
      endDate,
      targetAudience = 'all',
      backgroundColor,
      textColor,
      animation = 'none'
    } = req.body;

    const banner = await Banner.create({
      title,
      subtitle: subtitle || null,
      description: description || null,
      buttonText: buttonText || null,
      buttonUrl: buttonUrl || null,
      image: image || null,
      mobileImage: mobileImage || null,
      position,
      order: parseInt(order),
      isActive: Boolean(isActive),
      startDate: startDate || null,
      endDate: endDate || null,
      targetAudience,
      backgroundColor: backgroundColor || null,
      textColor: textColor || null,
      animation
    });

    res.json({
      success: true,
      message: '배너가 성공적으로 생성되었습니다',
      banner: {
        id: banner.id,
        title: banner.title,
        position: banner.position
      }
    });
  } catch (error) {
    console.error('Banner creation error:', error);
    res.status(500).json({
      success: false,
      message: '배너 생성 중 오류가 발생했습니다'
    });
  }
});

// Edit banner
router.get('/banners/edit/:id', requireAuth, async (req, res) => {
  try {
    const banner = await Banner.findByPk(req.params.id);
    
    if (!banner) {
      return res.status(404).render('admin/error', {
        title: 'Error - Admin Panel',
        layout: 'admin/layout',
        message: 'Banner not found'
      });
    }

    res.render('admin/banners/edit', {
      title: 'Edit Banner - Admin Panel',
      layout: 'admin/layout',
      user: req.session.user,
      banner,
      positions: [
        { value: 'hero', label: '메인 히어로' },
        { value: 'secondary', label: '보조 배너' },
        { value: 'footer', label: '푸터 배너' }
      ],
      animations: [
        { value: 'none', label: '없음' },
        { value: 'fade', label: '페이드' },
        { value: 'slide', label: '슬라이드' },
        { value: 'zoom', label: '줌' }
      ]
    });
  } catch (error) {
    console.error('Banner edit error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading banner'
    });
  }
});

// Update banner
router.put('/banners/:id', requireAuth, [
  body('title').notEmpty().withMessage('제목을 입력해주세요'),
  body('position').isIn(['hero', 'secondary', 'footer']).withMessage('유효한 위치를 선택해주세요'),
  body('order').isInt({ min: 0 }).withMessage('유효한 순서를 입력해주세요')
], async (req, res) => {
  try {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: '입력 데이터를 확인해주세요',
        errors: errors.array()
      });
    }

    const banner = await Banner.findByPk(req.params.id);
    if (!banner) {
      return res.status(404).json({
        success: false,
        message: '배너를 찾을 수 없습니다'
      });
    }

    const {
      title,
      subtitle,
      description,
      buttonText,
      buttonUrl,
      image,
      mobileImage,
      position,
      order,
      isActive,
      startDate,
      endDate,
      targetAudience,
      backgroundColor,
      textColor,
      animation
    } = req.body;

    await banner.update({
      title,
      subtitle: subtitle || null,
      description: description || null,
      buttonText: buttonText || null,
      buttonUrl: buttonUrl || null,
      image: image || null,
      mobileImage: mobileImage || null,
      position,
      order: parseInt(order),
      isActive: Boolean(isActive),
      startDate: startDate || null,
      endDate: endDate || null,
      targetAudience: targetAudience || 'all',
      backgroundColor: backgroundColor || null,
      textColor: textColor || null,
      animation: animation || 'none'
    });

    res.json({
      success: true,
      message: '배너가 성공적으로 업데이트되었습니다',
      banner: {
        id: banner.id,
        title: banner.title,
        position: banner.position
      }
    });
  } catch (error) {
    console.error('Banner update error:', error);
    res.status(500).json({
      success: false,
      message: '배너 업데이트 중 오류가 발생했습니다'
    });
  }
});

// Delete banner
router.delete('/banners/:id', requireAuth, async (req, res) => {
  try {
    const banner = await Banner.findByPk(req.params.id);
    
    if (!banner) {
      return res.status(404).json({
        success: false,
        message: '배너를 찾을 수 없습니다'
      });
    }

    await banner.destroy();

    res.json({
      success: true,
      message: '배너가 성공적으로 삭제되었습니다'
    });
  } catch (error) {
    console.error('Banner deletion error:', error);
    res.status(500).json({
      success: false,
      message: '배너 삭제 중 오류가 발생했습니다'
    });
  }
});

// Toggle banner active status
router.patch('/banners/:id/toggle-active', requireAuth, async (req, res) => {
  try {
    const banner = await Banner.findByPk(req.params.id);
    
    if (!banner) {
      return res.status(404).json({
        success: false,
        message: '배너를 찾을 수 없습니다'
      });
    }

    const newStatus = !banner.isActive;
    await banner.update({ isActive: newStatus });

    res.json({
      success: true,
      message: `배너가 ${newStatus ? '활성화' : '비활성화'}되었습니다`,
      isActive: newStatus
    });
  } catch (error) {
    console.error('Banner toggle active error:', error);
    res.status(500).json({
      success: false,
      message: '상태 변경 중 오류가 발생했습니다'
    });
  }
});

// Record banner click
router.post('/banners/:id/click', async (req, res) => {
  try {
    const banner = await Banner.findByPk(req.params.id);
    
    if (!banner) {
      return res.status(404).json({
        success: false,
        message: '배너를 찾을 수 없습니다'
      });
    }

    await banner.recordClick();

    res.json({
      success: true,
      clickCount: banner.clickCount
    });
  } catch (error) {
    console.error('Banner click record error:', error);
    res.status(500).json({
      success: false,
      message: '클릭 기록 중 오류가 발생했습니다'
    });
  }
});

// Banner Editor (legacy route)
router.get('/banner-editor', requireAuth, addStats, async (req, res) => {
  res.redirect('/admin/banners');
});

// Portfolio management
router.get('/portfolio', requireAuth, addStats, async (req, res) => {
  try {
    const page = parseInt(req.query.page) || 1;
    const limit = 20;
    const skip = (page - 1) * limit;

    const [portfolio, total] = await Promise.all([
      Portfolio.findAll({
        order: [['createdAt', 'DESC']],
        offset: skip,
        limit: limit
      }),
      Portfolio.count()
    ]);

    const totalPages = Math.ceil(total / limit);

    res.render('admin/portfolio/list', {
      title: 'Portfolio Management - Admin Panel',
      layout: 'admin/layout',
      currentPage: 'portfolio',
      user: req.session.user,
      portfolio,
      pagination: {
        current: page,
        total: totalPages,
        hasNext: page < totalPages,
        hasPrev: page > 1
      }
    });
  } catch (error) {
    console.error('Portfolio list error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading portfolio'
    });
  }
});

// Utility function for category names
const getCategoryName = (category) => {
  const categoryNames = {
    'web-development': 'Веб-разработка',
    'mobile-app': 'Мобильные приложения',
    'ui-ux-design': 'UI/UX дизайн',
    'e-commerce': 'Электронная коммерция',
    'enterprise': 'Корпоративное ПО',
    'other': 'Другое'
  };
  return categoryNames[category] || category;
};

// Add portfolio item
router.get('/portfolio/add', requireAuth, (req, res) => {
  res.render('admin/portfolio/add', {
    title: 'Add Portfolio Item - Admin Panel',
    layout: 'admin/layout',
    user: req.session.user,
    categories: [
      'web-development',
      'mobile-app',
      'ui-ux-design',
      'e-commerce',
      'enterprise',
      'other'
    ],
    getCategoryName: getCategoryName
  });
});

// Create portfolio item
router.post('/portfolio/add', requireAuth, upload.array('images', 10), async (req, res) => {
  try {
    const {
      title,
      shortDescription,
      description,
      category,
      technologies,
      demoUrl,
      githubUrl,
      clientName,
      duration,
      seoTitle,
      seoDescription,
      isPublished,
      featured
    } = req.body;

    // Validate required fields
    if (!title || !shortDescription || !description || !category) {
      return res.status(400).json({
        success: false,
        message: 'Заполните все обязательные поля'
      });
    }

    // Parse technologies from JSON string
    let parsedTechnologies = [];
    try {
      parsedTechnologies = JSON.parse(technologies || '[]');
    } catch (e) {
      parsedTechnologies = typeof technologies === 'string' ? [technologies] : [];
    }

    if (parsedTechnologies.length === 0) {
      return res.status(400).json({
        success: false,
        message: 'Добавьте хотя бы одну технологию'
      });
    }

    // Process uploaded images
    const processedImages = [];
    if (req.files && req.files.length > 0) {
      const uploadDir = path.join(process.cwd(), 'public', 'uploads', 'portfolio');
      
      // Ensure directory exists
      try {
        await fs.access(uploadDir);
      } catch {
        await fs.mkdir(uploadDir, { recursive: true });
      }

      for (const file of req.files) {
        const timestamp = Date.now();
        const filename = `${timestamp}-${Math.random().toString(36).substr(2, 9)}.webp`;
        const filepath = path.join(uploadDir, filename);

        // Process image with Sharp
        await sharp(file.buffer)
          .webp({ quality: 85 })
          .resize(1200, 800, { fit: 'inside', withoutEnlargement: true })
          .toFile(filepath);

        processedImages.push(`/uploads/portfolio/${filename}`);
      }
    }

    // Create SEO data
    const seo = {};
    if (seoTitle) seo.title = seoTitle;
    if (seoDescription) seo.description = seoDescription;

    // Create portfolio item
    const portfolio = await Portfolio.create({
      title,
      shortDescription,
      description,
      category,
      technologies: parsedTechnologies,
      images: processedImages,
      projectUrl: demoUrl || null,
      githubUrl: githubUrl || null,
      clientName: clientName || null,
      duration: duration ? parseInt(duration) : null,
      isPublished: isPublished === 'true' || isPublished === true,
      featured: featured === 'true' || featured === true,
      publishedAt: (isPublished === 'true' || isPublished === true) ? new Date() : null,
      status: (isPublished === 'true' || isPublished === true) ? 'published' : 'draft',
      seo: Object.keys(seo).length > 0 ? seo : null
    });

    res.json({
      success: true,
      message: 'Проект успешно создан!',
      portfolio: {
        id: portfolio.id,
        title: portfolio.title,
        category: portfolio.category,
        isPublished: portfolio.isPublished
      }
    });
  } catch (error) {
    console.error('Portfolio creation error:', error);
    res.status(500).json({
      success: false,
      message: 'Ошибка при создании проекта: ' + error.message
    });
  }
});

// Edit portfolio item
router.get('/portfolio/edit/:id', requireAuth, async (req, res) => {
  try {
    const portfolio = await Portfolio.findByPk(req.params.id);
    
    if (!portfolio) {
      return res.status(404).render('admin/error', {
        title: 'Error - Admin Panel',
        layout: 'admin/layout',
        message: 'Portfolio item not found'
      });
    }

    res.render('admin/portfolio/edit', {
      title: 'Edit Portfolio Item - Admin Panel',
      layout: 'admin/layout',
      user: req.session.user,
      portfolio,
      categories: [
        'web-development',
        'mobile-app',
        'ui-ux-design',
        'e-commerce',
        'enterprise',
        'other'
      ]
    });
  } catch (error) {
    console.error('Portfolio edit error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading portfolio item'
    });
  }
});

// Update portfolio item
router.put('/portfolio/:id', requireAuth, upload.array('images', 10), async (req, res) => {
  try {
    const portfolio = await Portfolio.findByPk(req.params.id);
    if (!portfolio) {
      return res.status(404).json({
        success: false,
        message: 'Проект не найден'
      });
    }

    const {
      title,
      shortDescription,
      description,
      category,
      technologies,
      demoUrl,
      githubUrl,
      clientName,
      duration,
      seoTitle,
      seoDescription,
      isPublished,
      featured,
      existingImages
    } = req.body;

    // Validate required fields
    if (!title || !shortDescription || !description || !category) {
      return res.status(400).json({
        success: false,
        message: 'Заполните все обязательные поля'
      });
    }

    // Parse technologies from JSON string
    let parsedTechnologies = [];
    try {
      parsedTechnologies = JSON.parse(technologies || '[]');
    } catch (e) {
      parsedTechnologies = typeof technologies === 'string' ? [technologies] : [];
    }

    // Handle existing images
    let finalImages = [];
    try {
      const existing = JSON.parse(existingImages || '[]');
      finalImages = Array.isArray(existing) ? existing : [];
    } catch (e) {
      finalImages = portfolio.images || [];
    }

    // Process new uploaded images
    if (req.files && req.files.length > 0) {
      const uploadDir = path.join(process.cwd(), 'public', 'uploads', 'portfolio');
      
      // Ensure directory exists
      try {
        await fs.access(uploadDir);
      } catch {
        await fs.mkdir(uploadDir, { recursive: true });
      }

      for (const file of req.files) {
        const timestamp = Date.now();
        const filename = `${timestamp}-${Math.random().toString(36).substr(2, 9)}.webp`;
        const filepath = path.join(uploadDir, filename);

        // Process image with Sharp
        await sharp(file.buffer)
          .webp({ quality: 85 })
          .resize(1200, 800, { fit: 'inside', withoutEnlargement: true })
          .toFile(filepath);

        finalImages.push(`/uploads/portfolio/${filename}`);
      }
    }

    // Create SEO data
    const seo = portfolio.seo || {};
    if (seoTitle) seo.title = seoTitle;
    if (seoDescription) seo.description = seoDescription;

    // Update portfolio
    await portfolio.update({
      title,
      shortDescription,
      description,
      category,
      technologies: parsedTechnologies,
      images: finalImages,
      projectUrl: demoUrl || null,
      githubUrl: githubUrl || null,
      clientName: clientName || null,
      duration: duration ? parseInt(duration) : null,
      isPublished: isPublished === 'true' || isPublished === true,
      featured: featured === 'true' || featured === true,
      publishedAt: (isPublished === 'true' || isPublished === true) && !portfolio.publishedAt ? new Date() : portfolio.publishedAt,
      status: (isPublished === 'true' || isPublished === true) ? 'published' : 'draft',
      seo: Object.keys(seo).length > 0 ? seo : null
    });

    res.json({
      success: true,
      message: 'Проект успешно обновлен!',
      portfolio: {
        id: portfolio.id,
        title: portfolio.title,
        category: portfolio.category,
        isPublished: portfolio.isPublished
      }
    });
  } catch (error) {
    console.error('Portfolio update error:', error);
    res.status(500).json({
      success: false,
      message: 'Ошибка при обновлении проекта: ' + error.message
    });
  }
});

// Delete portfolio item
router.delete('/portfolio/:id', requireAuth, async (req, res) => {
  try {
    const portfolio = await Portfolio.findByPk(req.params.id);
    
    if (!portfolio) {
      return res.status(404).json({
        success: false,
        message: '포트폴리오를 찾을 수 없습니다'
      });
    }

    await portfolio.destroy();

    res.json({
      success: true,
      message: '포트폴리오가 성공적으로 삭제되었습니다'
    });
  } catch (error) {
    console.error('Portfolio deletion error:', error);
    res.status(500).json({
      success: false,
      message: '포트폴리오 삭제 중 오류가 발생했습니다'
    });
  }
});

// Toggle portfolio publish status
router.patch('/portfolio/:id/toggle-publish', requireAuth, async (req, res) => {
  try {
    const portfolio = await Portfolio.findByPk(req.params.id);
    
    if (!portfolio) {
      return res.status(404).json({
        success: false,
        message: '포트폴리오를 찾을 수 없습니다'
      });
    }

    const newStatus = !portfolio.isPublished;
    await portfolio.update({
      isPublished: newStatus,
      publishedAt: newStatus && !portfolio.publishedAt ? new Date() : portfolio.publishedAt,
      status: newStatus ? 'published' : 'draft'
    });

    res.json({
      success: true,
      message: `포트폴리오가 ${newStatus ? '게시' : '비공개'}되었습니다`,
      isPublished: newStatus
    });
  } catch (error) {
    console.error('Portfolio toggle publish error:', error);
    res.status(500).json({
      success: false,
      message: '상태 변경 중 오류가 발생했습니다'
    });
  }
});

// Portfolio preview
router.post('/portfolio/preview', requireAuth, upload.array('images', 10), async (req, res) => {
  try {
    const {
      title,
      shortDescription,
      description,
      category,
      technologies,
      demoUrl,
      githubUrl,
      clientName
    } = req.body;

    // Parse technologies from JSON string
    let parsedTechnologies = [];
    try {
      parsedTechnologies = JSON.parse(technologies || '[]');
    } catch (e) {
      parsedTechnologies = typeof technologies === 'string' ? [technologies] : [];
    }

    // Process uploaded images for preview
    const previewImages = [];
    if (req.files && req.files.length > 0) {
      for (const file of req.files) {
        // Convert to base64 for preview
        const base64 = `data:${file.mimetype};base64,${file.buffer.toString('base64')}`;
        previewImages.push(base64);
      }
    }

    const previewData = {
      title,
      shortDescription,
      description,
      category,
      technologies: parsedTechnologies,
      images: previewImages,
      projectUrl: demoUrl || null,
      githubUrl: githubUrl || null,
      clientName: clientName || null,
      createdAt: new Date()
    };

    res.json({
      success: true,
      preview: previewData
    });
  } catch (error) {
    console.error('Portfolio preview error:', error);
    res.status(500).json({
      success: false,
      message: 'Ошибка при создании предпросмотра: ' + error.message
    });
  }
});

// Services management
router.get('/services', requireAuth, addStats, async (req, res) => {
  try {
    const page = parseInt(req.query.page) || 1;
    const limit = 20;
    const skip = (page - 1) * limit;

    const [services, total] = await Promise.all([
      Service.findAll({
        order: [['createdAt', 'DESC']],
        offset: skip,
        limit: limit
      }),
      Service.count()
    ]);

    const totalPages = Math.ceil(total / limit);

    res.render('admin/services/list', {
      title: 'Services Management - Admin Panel',
      layout: 'admin/layout',
      currentPage: 'services',
      user: req.session.user,
      services,
      pagination: {
        current: page,
        total: totalPages,
        hasNext: page < totalPages,
        hasPrev: page > 1
      }
    });
  } catch (error) {
    console.error('Services list error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading services'
    });
  }
});

// Add service
router.get('/services/add', requireAuth, (req, res) => {
  res.render('admin/services/add', {
    title: 'Add Service - Admin Panel',
    layout: 'admin/layout',
    user: req.session.user,
    serviceTypes: [
      'web-development',
      'mobile-app',
      'ui-ux-design',
      'e-commerce',
      'seo',
      'maintenance',
      'consultation',
      'other'
    ]
  });
});

// Create service
router.post('/services/add', requireAuth, [
  body('name').notEmpty().withMessage('서비스명을 입력해주세요'),
  body('shortDescription').notEmpty().withMessage('간단한 설명을 입력해주세요'),
  body('description').notEmpty().withMessage('자세한 설명을 입력해주세요'),
  body('category').notEmpty().withMessage('카테고리를 선택해주세요'),
  body('basePrice').isNumeric().withMessage('기본 가격을 입력해주세요')
], async (req, res) => {
  try {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: '입력 데이터를 확인해주세요',
        errors: errors.array()
      });
    }

    const {
      name,
      shortDescription,
      description,
      category,
      basePrice,
      features,
      duration,
      isActive = true,
      featured = false
    } = req.body;

    const service = await Service.create({
      name,
      shortDescription,
      description,
      category,
      basePrice: parseFloat(basePrice),
      features: features || [],
      duration: duration ? parseInt(duration) : null,
      isActive: Boolean(isActive),
      featured: Boolean(featured)
    });

    res.json({
      success: true,
      message: '서비스가 성공적으로 생성되었습니다',
      service: {
        id: service.id,
        name: service.name,
        category: service.category
      }
    });
  } catch (error) {
    console.error('Service creation error:', error);
    res.status(500).json({
      success: false,
      message: '서비스 생성 중 오류가 발생했습니다'
    });
  }
});

// Edit service
router.get('/services/edit/:id', requireAuth, async (req, res) => {
  try {
    const service = await Service.findByPk(req.params.id);
    
    if (!service) {
      return res.status(404).render('admin/error', {
        title: 'Error - Admin Panel',
        layout: 'admin/layout',
        message: 'Service not found'
      });
    }

    const availablePortfolio = await Portfolio.findAll({ 
      where: { isPublished: true },
      attributes: ['id', 'title', 'category']
    });

    res.render('admin/services/edit', {
      title: 'Edit Service - Admin Panel',
      layout: 'admin/layout',
      user: req.session.user,
      service,
      availablePortfolio,
      serviceTypes: [
        'web-development',
        'mobile-app',
        'ui-ux-design',
        'e-commerce',
        'seo',
        'maintenance',
        'consultation',
        'other'
      ]
    });
  } catch (error) {
    console.error('Service edit error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading service'
    });
  }
});

// Update service
router.put('/services/:id', requireAuth, [
  body('name').notEmpty().withMessage('서비스명을 입력해주세요'),
  body('shortDescription').notEmpty().withMessage('간단한 설명을 입력해주세요'),
  body('description').notEmpty().withMessage('자세한 설명을 입력해주세요'),
  body('category').notEmpty().withMessage('카테고리를 선택해주세요'),
  body('basePrice').isNumeric().withMessage('기본 가격을 입력해주세요')
], async (req, res) => {
  try {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: '입력 데이터를 확인해주세요',
        errors: errors.array()
      });
    }

    const service = await Service.findByPk(req.params.id);
    if (!service) {
      return res.status(404).json({
        success: false,
        message: '서비스를 찾을 수 없습니다'
      });
    }

    const {
      name,
      shortDescription,
      description,
      category,
      basePrice,
      features,
      duration,
      isActive,
      featured
    } = req.body;

    await service.update({
      name,
      shortDescription,
      description,
      category,
      basePrice: parseFloat(basePrice),
      features: features || [],
      duration: duration ? parseInt(duration) : null,
      isActive: Boolean(isActive),
      featured: Boolean(featured)
    });

    res.json({
      success: true,
      message: '서비스가 성공적으로 업데이트되었습니다',
      service: {
        id: service.id,
        name: service.name,
        category: service.category
      }
    });
  } catch (error) {
    console.error('Service update error:', error);
    res.status(500).json({
      success: false,
      message: '서비스 업데이트 중 오류가 발생했습니다'
    });
  }
});

// Delete service
router.delete('/services/:id', requireAuth, async (req, res) => {
  try {
    const service = await Service.findByPk(req.params.id);
    
    if (!service) {
      return res.status(404).json({
        success: false,
        message: '서비스를 찾을 수 없습니다'
      });
    }

    await service.destroy();

    res.json({
      success: true,
      message: '서비스가 성공적으로 삭제되었습니다'
    });
  } catch (error) {
    console.error('Service deletion error:', error);
    res.status(500).json({
      success: false,
      message: '서비스 삭제 중 오류가 발생했습니다'
    });
  }
});

// Toggle service active status
router.patch('/services/:id/toggle-active', requireAuth, async (req, res) => {
  try {
    const service = await Service.findByPk(req.params.id);
    
    if (!service) {
      return res.status(404).json({
        success: false,
        message: '서비스를 찾을 수 없습니다'
      });
    }

    const newStatus = !service.isActive;
    await service.update({ isActive: newStatus });

    res.json({
      success: true,
      message: `서비스가 ${newStatus ? '활성화' : '비활성화'}되었습니다`,
      isActive: newStatus
    });
  } catch (error) {
    console.error('Service toggle active error:', error);
    res.status(500).json({
      success: false,
      message: '상태 변경 중 오류가 발생했습니다'
    });
  }
});

// Contacts management
router.get('/contacts', requireAuth, addStats, async (req, res) => {
  try {
    const page = parseInt(req.query.page) || 1;
    const limit = 20;
    const skip = (page - 1) * limit;
    const status = req.query.status;

    let whereClause = {};
    if (status && status !== 'all') {
      whereClause.status = status;
    }

    const [contacts, total] = await Promise.all([
      Contact.findAll({
        where: whereClause,
        order: [['createdAt', 'DESC']],
        offset: skip,
        limit: limit
      }),
      Contact.count({ where: whereClause })
    ]);

    const totalPages = Math.ceil(total / limit);

    res.render('admin/contacts/list', {
      title: 'Contacts Management - Admin Panel',
      layout: 'admin/layout',
      currentPage: 'contacts',
      user: req.session.user,
      contacts,
      currentStatus: status || 'all',
      pagination: {
        current: page,
        total: totalPages,
        hasNext: page < totalPages,
        hasPrev: page > 1
      }
    });
  } catch (error) {
    console.error('Contacts list error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading contacts'
    });
  }
});

// View contact details
router.get('/contacts/:id', requireAuth, async (req, res) => {
  try {
    const contact = await Contact.findByPk(req.params.id);
    
    if (!contact) {
      return res.status(404).render('admin/error', {
        title: 'Error - Admin Panel',
        layout: 'admin/layout',
        message: 'Contact not found'
      });
    }

    // Mark as read
    if (!contact.isRead) {
      contact.isRead = true;
      await contact.save();
    }

    res.render('admin/contacts/view', {
      title: 'Contact Details - Admin Panel',
      layout: 'admin/layout',
      user: req.session.user,
      contact
    });
  } catch (error) {
    console.error('Contact view error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading contact'
    });
  }
});

// Settings
router.get('/settings', requireAuth, addStats, async (req, res) => {
  try {
    const settings = await SiteSettings.findOne() || await SiteSettings.create({});
    
    res.render('admin/settings', {
      title: 'Site Settings - Admin Panel',
      layout: 'admin/layout',
      currentPage: 'settings',
      user: req.session.user,
      settings
    });
  } catch (error) {
    console.error('Settings error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading settings'
    });
  }
});

// Media gallery
router.get('/media', requireAuth, addStats, (req, res) => {
  res.render('admin/media', {
    title: 'Media Gallery - Admin Panel',
    layout: 'admin/layout',
    currentPage: 'media',
    user: req.session.user
  });
});

// Telegram bot configuration and testing
router.get('/telegram', requireAuth, addStats, async (req, res) => {
  try {
    const telegramService = require('../services/telegram');
    
    // Get bot info and available chats if token is configured
    let botInfo = null;
    let availableChats = [];
    
    if (telegramService.botToken) {
      const result = await telegramService.getBotInfo();
      if (result.success) {
        botInfo = result.bot;
        availableChats = telegramService.getAvailableChats();
      }
    }

    res.render('admin/telegram', {
      title: 'Telegram Bot - Admin Panel',
      layout: 'admin/layout',
      currentPage: 'telegram',
      user: req.session.user,
      botConfigured: telegramService.isEnabled,
      botToken: telegramService.botToken || '',
      chatId: telegramService.chatId || '',
      botInfo,
      availableChats
    });
  } catch (error) {
    console.error('Telegram page error:', error);
    res.status(500).render('admin/error', {
      title: 'Error - Admin Panel',
      layout: 'admin/layout',
      message: 'Error loading Telegram settings'
    });
  }
});

// Update bot token
router.post('/telegram/configure', requireAuth, [
  body('botToken').notEmpty().withMessage('Bot token is required'),
  body('chatId').optional().isNumeric().withMessage('Chat ID must be numeric')
], async (req, res) => {
  try {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: 'Validation failed',
        errors: errors.array()
      });
    }

    const { botToken, chatId } = req.body;
    const telegramService = require('../services/telegram');
    
    // Update bot token
    const result = await telegramService.updateBotToken(botToken);
    
    if (result.success) {
      // Update chat ID if provided
      if (chatId) {
        telegramService.updateChatId(parseInt(chatId));
      }
      
      // Update environment variables (in production, this should update a config file)
      process.env.TELEGRAM_BOT_TOKEN = botToken;
      if (chatId) {
        process.env.TELEGRAM_CHAT_ID = chatId;
      }

      res.json({
        success: true,
        message: 'Telegram bot configured successfully',
        botInfo: result.bot,
        availableChats: result.availableChats || []
      });
    } else {
      res.status(400).json({
        success: false,
        message: result.error || 'Failed to configure bot'
      });
    }
  } catch (error) {
    console.error('Configure Telegram bot error:', error);
    res.status(500).json({
      success: false,
      message: 'Error configuring Telegram bot'
    });
  }
});

// Get bot info and discover chats
router.get('/telegram/info', requireAuth, async (req, res) => {
  try {
    const telegramService = require('../services/telegram');
    const result = await telegramService.testConnection();
    
    if (result.success) {
      res.json({
        success: true,
        botInfo: result.bot,
        availableChats: result.availableChats || [],
        isConfigured: telegramService.isEnabled
      });
    } else {
      res.status(400).json({
        success: false,
        message: result.error || result.message || 'Failed to get bot info'
      });
    }
  } catch (error) {
    console.error('Get Telegram info error:', error);
    res.status(500).json({
      success: false,
      message: 'Error getting bot information'
    });
  }
});

// Get chat information
router.get('/telegram/chat/:chatId', requireAuth, async (req, res) => {
  try {
    const telegramService = require('../services/telegram');
    const result = await telegramService.getChat(req.params.chatId);
    
    if (result.success) {
      res.json({
        success: true,
        chat: result.chat
      });
    } else {
      res.status(400).json({
        success: false,
        message: result.error || 'Failed to get chat info'
      });
    }
  } catch (error) {
    console.error('Get chat info error:', error);
    res.status(500).json({
      success: false,
      message: 'Error getting chat information'
    });
  }
});

// Test connection
router.post('/telegram/test', requireAuth, async (req, res) => {
  try {
    const telegramService = require('../services/telegram');
    const result = await telegramService.testConnection();
    
    if (result.success) {
      const testMessage = `🤖 <b>Тест Telegram бота</b>\n\n` +
                         `✅ Соединение успешно установлено!\n` +
                         `🤖 <b>Бот:</b> @${result.bot.username} (${result.bot.first_name})\n` +
                         `🆔 <b>ID бота:</b> ${result.bot.id}\n` +
                         `⏰ <b>Время тестирования:</b> ${new Date().toLocaleString('ru-RU')}\n` +
                         `🌐 <b>Сайт:</b> ${process.env.BASE_URL || 'http://localhost:3000'}\n\n` +
                         `Бот готов к отправке уведомлений! 🚀`;
      
      const sendResult = await telegramService.sendMessage(testMessage);
      
      if (sendResult.success) {
        res.json({
          success: true,
          message: 'Test message sent successfully!',
          botInfo: result.bot,
          availableChats: result.availableChats || []
        });
      } else {
        res.status(400).json({
          success: false,
          message: 'Bot connection successful, but failed to send test message: ' + (sendResult.error || sendResult.message)
        });
      }
    } else {
      res.status(400).json({
        success: false,
        message: result.message || result.error || 'Failed to connect to Telegram bot'
      });
    }
  } catch (error) {
    console.error('Telegram test error:', error);
    res.status(500).json({
      success: false,
      message: 'Error testing Telegram bot'
    });
  }
});

// Send custom message
router.post('/telegram/send', requireAuth, [
  body('message').notEmpty().withMessage('Message is required'),
  body('chatIds').optional().isArray().withMessage('Chat IDs must be an array'),
  body('parseMode').optional().isIn(['HTML', 'Markdown', 'MarkdownV2']).withMessage('Invalid parse mode')
], async (req, res) => {
  try {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: 'Validation failed',
        errors: errors.array()
      });
    }

    const { 
      message, 
      chatIds = [], 
      parseMode = 'HTML', 
      disableWebPagePreview = false,
      disableNotification = false 
    } = req.body;

    const telegramService = require('../services/telegram');
    
    let result;
    if (chatIds.length > 0) {
      // Send to multiple chats
      result = await telegramService.sendCustomMessage({
        text: message,
        chatIds: chatIds.map(id => parseInt(id)),
        parseMode,
        disableWebPagePreview,
        disableNotification
      });
      
      res.json({
        success: result.success,
        message: result.success ? 
          `Message sent to ${result.totalSent} chat(s). ${result.totalFailed} failed.` :
          'Failed to send message',
        results: result.results || [],
        errors: result.errors || []
      });
    } else {
      // Send to default chat
      result = await telegramService.sendMessage(message, {
        parse_mode: parseMode,
        disable_web_page_preview: disableWebPagePreview,
        disable_notification: disableNotification
      });
      
      if (result.success) {
        res.json({
          success: true,
          message: 'Message sent successfully!'
        });
      } else {
        res.status(400).json({
          success: false,
          message: result.error || result.message || 'Failed to send message'
        });
      }
    }
  } catch (error) {
    console.error('Send Telegram message error:', error);
    res.status(500).json({
      success: false,
      message: 'Error sending message'
    });
  }
});

// Settings page
router.get('/settings', requireAuth, addStats, (req, res) => {
  res.render('admin/settings', {
    title: 'Site Settings - Admin Panel',
    layout: 'admin/layout',
    user: req.session.user
  });
});

// Banner editor page
router.get('/banner-editor', requireAuth, addStats, (req, res) => {
  res.render('admin/banner-editor', {
    title: 'Banner Editor - Admin Panel',
    layout: 'admin/layout',
    user: req.session.user
  });
});

module.exports = router;