import { Router } from 'express';
import { authMiddleware } from '../auth/middleware';
import { pool } from '../db/pool';

const router = Router();
router.use(authMiddleware);

// Get analytics overview
router.get('/overview', async (req, res) => {
  try {
    const { days = 30 } = req.query;
    
    // Total clicks
    const clicksResult = await pool.query(`
      SELECT COUNT(*) as total_clicks
      FROM clicks
      WHERE clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
    `);
    
    // Unique products clicked
    const uniqueProductsResult = await pool.query(`
      SELECT COUNT(DISTINCT product_id) as unique_products
      FROM clicks
      WHERE clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
    `);
    
    // Clicks by day
    const clicksByDayResult = await pool.query(`
      SELECT DATE(clicked_at) as date, COUNT(*) as clicks
      FROM clicks
      WHERE clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
      GROUP BY DATE(clicked_at)
      ORDER BY date DESC
    `);
    
    // Top products
    const topProductsResult = await pool.query(`
      SELECT p.id, p.name_raw as name, p.price_rec as price, COUNT(c.id) as click_count
      FROM clicks c
      JOIN store_products p ON c.product_id = p.id
      WHERE c.clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
      GROUP BY p.id, p.name_raw, p.price_rec
      ORDER BY click_count DESC
      LIMIT 10
    `);
    
    res.json({
      overview: {
        total_clicks: parseInt(clicksResult.rows[0].total_clicks),
        unique_products: parseInt(uniqueProductsResult.rows[0].unique_products)
      },
      clicks_by_day: clicksByDayResult.rows,
      top_products: topProductsResult.rows
    });
  } catch (error) {
    console.error('Error fetching analytics:', error);
    res.status(500).json({ error: 'Failed to fetch analytics' });
  }
});

// Get product analytics
router.get('/products/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const { days = 30 } = req.query;
    
    // Total clicks for this product
    const totalResult = await pool.query(`
      SELECT COUNT(*) as total_clicks
      FROM clicks
      WHERE product_id = $1 
        AND clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
    `, [id]);
    
    // Clicks by day
    const byDayResult = await pool.query(`
      SELECT DATE(clicked_at) as date, COUNT(*) as clicks
      FROM clicks
      WHERE product_id = $1
        AND clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
      GROUP BY DATE(clicked_at)
      ORDER BY date DESC
    `, [id]);
    
    res.json({
      product_id: parseInt(id),
      total_clicks: parseInt(totalResult.rows[0].total_clicks),
      clicks_by_day: byDayResult.rows
    });
  } catch (error) {
    console.error('Error fetching product analytics:', error);
    res.status(500).json({ error: 'Failed to fetch product analytics' });
  }
});

// Get campaign analytics
router.get('/campaigns/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const { days = 30 } = req.query;
    
    // Total clicks for this campaign
    const totalResult = await pool.query(`
      SELECT COUNT(*) as total_clicks
      FROM clicks
      WHERE campaign_id = $1 
        AND clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
    `, [id]);
    
    // Clicks by product in this campaign
    const byProductResult = await pool.query(`
      SELECT p.id, p.name_raw as name, COUNT(c.id) as clicks
      FROM clicks c
      JOIN store_products p ON c.product_id = p.id
      WHERE c.campaign_id = $1
        AND c.clicked_at >= NOW() - INTERVAL '${parseInt(days as string)} days'
      GROUP BY p.id, p.name_raw
      ORDER BY clicks DESC
    `, [id]);
    
    res.json({
      campaign_id: parseInt(id),
      total_clicks: parseInt(totalResult.rows[0].total_clicks),
      clicks_by_product: byProductResult.rows
    });
  } catch (error) {
    console.error('Error fetching campaign analytics:', error);
    res.status(500).json({ error: 'Failed to fetch campaign analytics' });
  }
});

export default router;