const express = require('express');
const router = express.Router();
const multer = require('multer');
const path = require('path');
const fs = require('fs').promises;
const db = require('../config/database');
const { requireAuth } = require('../middleware/auth');

// Configure multer for file upload
const storage = multer.diskStorage({
  destination: async (req, file, cb) => {
    const uploadDir = path.join(__dirname, '../../img/logo');
    try {
      await fs.mkdir(uploadDir, { recursive: true });
      cb(null, uploadDir);
    } catch (error) {
      cb(error);
    }
  },
  filename: (req, file, cb) => {
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    cb(null, uniqueSuffix + path.extname(file.originalname));
  }
});

const upload = multer({
  storage: storage,
  limits: {
    fileSize: 5 * 1024 * 1024 // 5MB
  },
  fileFilter: (req, file, cb) => {
    const allowedTypes = /jpeg|jpg|png|gif|svg/;
    const extname = allowedTypes.test(path.extname(file.originalname).toLowerCase());
    const mimetype = allowedTypes.test(file.mimetype);

    if (mimetype && extname) {
      return cb(null, true);
    } else {
      cb(new Error('Only image files are allowed (jpg, jpeg, png, gif, svg)'));
    }
  }
});

// Public endpoint: Get active partners (for frontend display)
router.get('/public', async (req, res) => {
  try {
    const [partners] = await db.query(
      'SELECT name, logo, url FROM partners WHERE status = 1 ORDER BY sort_order ASC, id DESC'
    );

    res.json({
      success: true,
      data: partners
    });
  } catch (error) {
    console.error('Get public partners error:', error);
    res.status(500).json({
      success: false,
      message: 'Failed to fetch partners'
    });
  }
});

// Get all partners
router.get('/', requireAuth, async (req, res) => {
  try {
    const [partners] = await db.query(
      'SELECT * FROM partners ORDER BY sort_order ASC, id DESC'
    );

    res.json({
      success: true,
      data: partners
    });
  } catch (error) {
    console.error('Get partners error:', error);
    res.status(500).json({
      success: false,
      message: 'Failed to fetch partners'
    });
  }
});

// Get single partner
router.get('/:id', requireAuth, async (req, res) => {
  try {
    const [partners] = await db.query(
      'SELECT * FROM partners WHERE id = ?',
      [req.params.id]
    );

    if (partners.length === 0) {
      return res.status(404).json({
        success: false,
        message: 'Partner not found'
      });
    }

    res.json({
      success: true,
      data: partners[0]
    });
  } catch (error) {
    console.error('Get partner error:', error);
    res.status(500).json({
      success: false,
      message: 'Failed to fetch partner'
    });
  }
});

// Create partner
router.post('/', requireAuth, upload.single('logo'), async (req, res) => {
  try {
    const { name, url, status } = req.body;

    if (!name) {
      return res.status(400).json({
        success: false,
        message: 'Partner name is required'
      });
    }

    if (!req.file) {
      return res.status(400).json({
        success: false,
        message: 'Logo image is required'
      });
    }

    const logoPath = 'img/logo/' + req.file.filename;

    // Get max sort order
    const [maxOrder] = await db.query(
      'SELECT MAX(sort_order) as max_order FROM partners'
    );
    const sortOrder = (maxOrder[0].max_order || 0) + 1;

    const [result] = await db.query(
      'INSERT INTO partners (name, logo, url, sort_order, status) VALUES (?, ?, ?, ?, ?)',
      [name, logoPath, url || '', sortOrder, status || 1]
    );

    res.json({
      success: true,
      message: 'Partner created successfully',
      data: {
        id: result.insertId,
        name,
        logo: logoPath,
        url: url || '',
        sort_order: sortOrder,
        status: status || 1
      }
    });
  } catch (error) {
    console.error('Create partner error:', error);
    res.status(500).json({
      success: false,
      message: 'Failed to create partner'
    });
  }
});

// Update partner
router.put('/:id', requireAuth, upload.single('logo'), async (req, res) => {
  try {
    const { name, url, status, sort_order } = req.body;
    const partnerId = req.params.id;

    // Check if partner exists
    const [existingPartner] = await db.query(
      'SELECT * FROM partners WHERE id = ?',
      [partnerId]
    );

    if (existingPartner.length === 0) {
      return res.status(404).json({
        success: false,
        message: 'Partner not found'
      });
    }

    let logoPath = existingPartner[0].logo;

    // If new logo uploaded, delete old one and use new one
    if (req.file) {
      // Delete old logo file
      const oldLogoPath = path.join(__dirname, '../..', existingPartner[0].logo);
      try {
        await fs.unlink(oldLogoPath);
      } catch (err) {
        console.log('Old logo file not found or cannot be deleted');
      }

      logoPath = 'img/logo/' + req.file.filename;
    }

    await db.query(
      'UPDATE partners SET name = ?, logo = ?, url = ?, status = ?, sort_order = ? WHERE id = ?',
      [name, logoPath, url || '', status || 1, sort_order || existingPartner[0].sort_order, partnerId]
    );

    res.json({
      success: true,
      message: 'Partner updated successfully'
    });
  } catch (error) {
    console.error('Update partner error:', error);
    res.status(500).json({
      success: false,
      message: 'Failed to update partner'
    });
  }
});

// Delete partner
router.delete('/:id', requireAuth, async (req, res) => {
  try {
    const partnerId = req.params.id;

    // Get partner info
    const [partner] = await db.query(
      'SELECT * FROM partners WHERE id = ?',
      [partnerId]
    );

    if (partner.length === 0) {
      return res.status(404).json({
        success: false,
        message: 'Partner not found'
      });
    }

    // Delete logo file
    const logoPath = path.join(__dirname, '../..', partner[0].logo);
    try {
      await fs.unlink(logoPath);
    } catch (err) {
      console.log('Logo file not found or cannot be deleted');
    }

    // Delete from database
    await db.query('DELETE FROM partners WHERE id = ?', [partnerId]);

    res.json({
      success: true,
      message: 'Partner deleted successfully'
    });
  } catch (error) {
    console.error('Delete partner error:', error);
    res.status(500).json({
      success: false,
      message: 'Failed to delete partner'
    });
  }
});

module.exports = router;