/**
 * Intelligence API Routes
 *
 * Brand and pricing intelligence endpoints for the CannaiQ admin dashboard.
 * Uses canonical store_products table for aggregated analytics.
 */
import { Router, Request, Response } from 'express';
import { authMiddleware } from '../auth/middleware';
import { pool } from '../db/pool';

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

/**
 * GET /api/admin/intelligence/brands
 * List all brands with state presence, store counts, and pricing
 */
router.get('/brands', async (req: Request, res: Response) => {
  try {
    const { limit = '500', offset = '0' } = req.query;
    const limitNum = Math.min(parseInt(limit as string, 10), 1000);
    const offsetNum = parseInt(offset as string, 10);

    const { rows } = await pool.query(`
      SELECT
        sp.brand_name_raw as brand_name,
        array_agg(DISTINCT d.state) FILTER (WHERE d.state IS NOT NULL) as states,
        COUNT(DISTINCT d.id) as store_count,
        COUNT(DISTINCT sp.id) as sku_count,
        ROUND(AVG(sp.price_rec) FILTER (WHERE sp.price_rec > 0)::numeric, 2) as avg_price_rec,
        ROUND(AVG(sp.price_med) FILTER (WHERE sp.price_med > 0)::numeric, 2) as avg_price_med
      FROM store_products sp
      JOIN dispensaries d ON sp.dispensary_id = d.id
      WHERE sp.brand_name_raw IS NOT NULL AND sp.brand_name_raw != ''
      GROUP BY sp.brand_name_raw
      ORDER BY store_count DESC, sku_count DESC
      LIMIT $1 OFFSET $2
    `, [limitNum, offsetNum]);

    // Get total count
    const { rows: countRows } = await pool.query(`
      SELECT COUNT(DISTINCT brand_name_raw) as total
      FROM store_products
      WHERE brand_name_raw IS NOT NULL AND brand_name_raw != ''
    `);

    res.json({
      brands: rows.map((r: any) => ({
        brandName: r.brand_name,
        states: r.states || [],
        storeCount: parseInt(r.store_count, 10),
        skuCount: parseInt(r.sku_count, 10),
        avgPriceRec: r.avg_price_rec ? parseFloat(r.avg_price_rec) : null,
        avgPriceMed: r.avg_price_med ? parseFloat(r.avg_price_med) : null,
      })),
      total: parseInt(countRows[0]?.total || '0', 10),
      limit: limitNum,
      offset: offsetNum,
    });
  } catch (error: any) {
    console.error('[Intelligence] Error fetching brands:', error.message);
    res.status(500).json({ error: error.message });
  }
});

/**
 * GET /api/admin/intelligence/brands/:brandName/penetration
 * Get state-by-state penetration for a specific brand
 */
router.get('/brands/:brandName/penetration', async (req: Request, res: Response) => {
  try {
    const { brandName } = req.params;

    const { rows } = await pool.query(`
      WITH state_totals AS (
        SELECT
          d.state,
          s.name AS state_name,
          COUNT(DISTINCT d.id) AS total_stores
        FROM dispensaries d
        JOIN states s ON d.state = s.code
        WHERE d.state IS NOT NULL
        GROUP BY d.state, s.name
      ),
      brand_presence AS (
        SELECT
          d.state,
          COUNT(DISTINCT d.id) AS stores_with_brand,
          COUNT(DISTINCT sp.id) AS product_count,
          ROUND(AVG(sp.price_rec)::numeric, 2) AS avg_price
        FROM store_products sp
        JOIN dispensaries d ON sp.dispensary_id = d.id
        WHERE sp.brand_name_raw ILIKE $1
          AND d.state IS NOT NULL
        GROUP BY d.state
      )
      SELECT
        st.state,
        st.state_name AS "stateName",
        st.total_stores AS "totalStores",
        COALESCE(bp.stores_with_brand, 0) AS "storesWithBrand",
        CASE
          WHEN st.total_stores > 0
          THEN ROUND((COALESCE(bp.stores_with_brand, 0)::numeric / st.total_stores) * 100, 2)
          ELSE 0
        END AS "penetrationPct",
        COALESCE(bp.product_count, 0) AS "productCount",
        bp.avg_price AS "avgPrice"
      FROM state_totals st
      LEFT JOIN brand_presence bp ON st.state = bp.state
      WHERE COALESCE(bp.stores_with_brand, 0) > 0
      ORDER BY COALESCE(bp.stores_with_brand, 0) DESC
    `, [brandName]);

    // Calculate national metrics
    const { rows: nationalRows } = await pool.query(`
      SELECT
        COUNT(DISTINCT d.id) AS total_stores,
        COUNT(DISTINCT CASE WHEN sp.brand_name_raw ILIKE $1 THEN d.id END) AS stores_with_brand,
        AVG(sp.price_rec) FILTER (WHERE sp.brand_name_raw ILIKE $1) AS avg_price
      FROM dispensaries d
      LEFT JOIN store_products sp ON d.id = sp.dispensary_id
      WHERE d.state IS NOT NULL
    `, [brandName]);

    const national = nationalRows[0];
    const nationalPenetration = national.total_stores > 0
      ? (national.stores_with_brand / national.total_stores) * 100
      : 0;

    res.json({
      brandName,
      states: rows,
      nationalPenetration: Math.round(nationalPenetration * 100) / 100,
      nationalAvgPrice: national.avg_price
        ? Math.round(parseFloat(national.avg_price) * 100) / 100
        : null,
      bestPerformingState: rows[0]?.state || null,
      worstPerformingState: rows[rows.length - 1]?.state || null,
    });
  } catch (error: any) {
    console.error('[Intelligence] Error fetching brand penetration:', error.message);
    res.status(500).json({ error: error.message });
  }
});

/**
 * GET /api/admin/intelligence/pricing
 * Get pricing analytics by category
 */
router.get('/pricing', async (req: Request, res: Response) => {
  try {
    const { rows: categoryRows } = await pool.query(`
      SELECT
        sp.category_raw as category,
        ROUND(AVG(sp.price_rec)::numeric, 2) as avg_price,
        MIN(sp.price_rec) as min_price,
        MAX(sp.price_rec) as max_price,
        ROUND(PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY sp.price_rec)::numeric, 2) as median_price,
        COUNT(*) as product_count
      FROM store_products sp
      WHERE sp.category_raw IS NOT NULL AND sp.price_rec > 0
      GROUP BY sp.category_raw
      ORDER BY product_count DESC
    `);

    const { rows: stateRows } = await pool.query(`
      SELECT
        d.state,
        ROUND(AVG(sp.price_rec)::numeric, 2) as avg_price,
        MIN(sp.price_rec) as min_price,
        MAX(sp.price_rec) as max_price,
        COUNT(DISTINCT sp.id) as product_count
      FROM store_products sp
      JOIN dispensaries d ON sp.dispensary_id = d.id
      WHERE d.state IS NOT NULL AND sp.price_rec > 0
      GROUP BY d.state
      ORDER BY avg_price DESC
    `);

    res.json({
      byCategory: categoryRows.map((r: any) => ({
        category: r.category,
        avgPrice: r.avg_price ? parseFloat(r.avg_price) : null,
        minPrice: r.min_price ? parseFloat(r.min_price) : null,
        maxPrice: r.max_price ? parseFloat(r.max_price) : null,
        medianPrice: r.median_price ? parseFloat(r.median_price) : null,
        productCount: parseInt(r.product_count, 10),
      })),
      byState: stateRows.map((r: any) => ({
        state: r.state,
        avgPrice: r.avg_price ? parseFloat(r.avg_price) : null,
        minPrice: r.min_price ? parseFloat(r.min_price) : null,
        maxPrice: r.max_price ? parseFloat(r.max_price) : null,
        productCount: parseInt(r.product_count, 10),
      })),
    });
  } catch (error: any) {
    console.error('[Intelligence] Error fetching pricing:', error.message);
    res.status(500).json({ error: error.message });
  }
});

/**
 * GET /api/admin/intelligence/stores
 * Get store intelligence summary
 */
router.get('/stores', async (req: Request, res: Response) => {
  try {
    const { rows: storeRows } = await pool.query(`
      SELECT
        d.id,
        d.name,
        d.dba_name,
        d.city,
        d.state,
        d.menu_type,
        d.crawl_enabled,
        COUNT(DISTINCT sp.id) as product_count,
        COUNT(DISTINCT sp.brand_name_raw) as brand_count,
        ROUND(AVG(sp.price_rec)::numeric, 2) as avg_price,
        MAX(sp.updated_at) as last_product_update
      FROM dispensaries d
      LEFT JOIN store_products sp ON sp.dispensary_id = d.id
      WHERE d.state IS NOT NULL
      GROUP BY d.id, d.name, d.dba_name, d.city, d.state, d.menu_type, d.crawl_enabled
      ORDER BY product_count DESC
      LIMIT 200
    `);

    res.json({
      stores: storeRows.map((r: any) => ({
        id: r.id,
        name: r.name,
        dbaName: r.dba_name,
        city: r.city,
        state: r.state,
        menuType: r.menu_type,
        crawlEnabled: r.crawl_enabled,
        productCount: parseInt(r.product_count || '0', 10),
        brandCount: parseInt(r.brand_count || '0', 10),
        avgPrice: r.avg_price ? parseFloat(r.avg_price) : null,
        lastProductUpdate: r.last_product_update,
      })),
      total: storeRows.length,
    });
  } catch (error: any) {
    console.error('[Intelligence] Error fetching stores:', error.message);
    res.status(500).json({ error: error.message });
  }
});

export default router;