feat: скидки на товары и редактирование промокодов в админке

Цена со скидкой и срок акции на товаре; отображение в каталоге и корзине. Улучшенный UI промокодов с редактированием.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/routes/admin.js

@@ -99,12 +99,20 @@ router.get(
        LEFT JOIN categories c ON c.id = p.category_id
        ORDER BY p.id`
     );
+    const productPrice = require('../utils/productPrice');
     res.render('admin/products', {
       title: 'Товары',
       products,
       formatPrice,
+      isSaleActive: productPrice.isSaleActive,
+      effectivePrice: productPrice.getEffectivePriceCents,
+      salePercent: productPrice.salePercent,
       stockUpdated: req.query.stock_updated === '1',
       notified: req.query.notified ? parseInt(req.query.notified, 10) : 0,
+      pricingUpdated: req.query.pricing_updated === '1',
+      pricingError: req.query.pricing_error
+        ? decodeURIComponent(String(req.query.pricing_error))
+        : null,
     });
   })
 );
@@ -135,6 +143,114 @@ router.post(
   })
 );
 
+router.post(
+  '/products/:id/pricing',
+  asyncHandler(async (req, res) => {
+    const productId = parseInt(req.params.id, 10);
+    const priceRub = parseFloat(String(req.body.price_rub || '').replace(',', '.'));
+    const saleRubRaw = String(req.body.sale_price_rub ?? '').trim();
+    const clearSale = req.body.clear_sale === '1';
+
+    if (clearSale) {
+      const price_cents = Number.isFinite(priceRub) ? Math.round(priceRub * 100) : null;
+      if (!Number.isFinite(productId) || price_cents == null || price_cents < 0) {
+        return res.redirect('/admin/products?pricing_error=' + encodeURIComponent('Некорректная цена'));
+      }
+      await query(
+        `UPDATE products SET price_cents = $1, sale_price_cents = NULL, sale_ends_at = NULL WHERE id = $2`,
+        [price_cents, productId]
+      );
+      return res.redirect('/admin/products?pricing_updated=1');
+    }
+
+    if (!Number.isFinite(productId) || !Number.isFinite(priceRub) || priceRub < 0) {
+      return res.redirect('/admin/products?pricing_error=' + encodeURIComponent('Некорректная цена'));
+    }
+
+    const { rows: existingRows } = await query(
+      'SELECT sale_price_cents, sale_ends_at FROM products WHERE id = $1',
+      [productId]
+    );
+    const existing = existingRows[0] || {};
+
+    const price_cents = Math.round(priceRub * 100);
+    let sale_price_cents = existing.sale_price_cents ?? null;
+    let sale_ends_at = existing.sale_ends_at ?? null;
+
+    if (saleRubRaw !== '') {
+      const saleRub = parseFloat(saleRubRaw.replace(',', '.'));
+      if (!Number.isFinite(saleRub) || saleRub < 0) {
+        return res.redirect(
+          '/admin/products?pricing_error=' + encodeURIComponent('Некорректная цена со скидкой')
+        );
+      }
+      sale_price_cents = Math.round(saleRub * 100);
+      if (sale_price_cents >= price_cents) {
+        return res.redirect(
+          '/admin/products?pricing_error=' +
+            encodeURIComponent('Цена со скидкой должна быть ниже обычной')
+        );
+      }
+    } else if (!('sale_ends_at' in req.body)) {
+      sale_price_cents = null;
+      sale_ends_at = null;
+    }
+
+    if ('sale_ends_at' in req.body) {
+      sale_ends_at = req.body.sale_ends_at
+        ? new Date(req.body.sale_ends_at).toISOString()
+        : null;
+    }
+
+    await query(
+      `UPDATE products SET price_cents = $1, sale_price_cents = $2, sale_ends_at = $3 WHERE id = $4`,
+      [price_cents, sale_price_cents, sale_ends_at, productId]
+    );
+
+    res.redirect('/admin/products?pricing_updated=1');
+  })
+);
+
+router.post(
+  '/promo-codes/:id/update',
+  asyncHandler(async (req, res) => {
+    const id = parseInt(req.params.id, 10);
+    const description = (req.body.description || '').trim();
+    const discount_type = req.body.discount_type === 'fixed' ? 'fixed' : 'percent';
+    const discount_value = parseInt(req.body.discount_value, 10);
+    const min_order_cents = Math.max(0, parseInt(req.body.min_order_rub, 10) || 0) * 100;
+    const max_uses =
+      req.body.max_uses === '' || req.body.max_uses == null
+        ? null
+        : parseInt(req.body.max_uses, 10);
+
+    const { rows: promoRows } = await query('SELECT expires_at FROM promo_codes WHERE id = $1', [
+      id,
+    ]);
+    let expires_at = promoRows[0]?.expires_at;
+    if (req.body.valid_days) {
+      const days = Math.max(1, parseInt(req.body.valid_days, 10) || 7);
+      const expires = new Date();
+      expires.setDate(expires.getDate() + days);
+      expires_at = expires.toISOString();
+    }
+
+    const value =
+      discount_type === 'percent'
+        ? Math.min(100, discount_value)
+        : discount_value * 100;
+
+    await query(
+      `UPDATE promo_codes SET
+         description = $1, discount_type = $2, discount_value = $3,
+         expires_at = $4, min_order_cents = $5, max_uses = $6
+       WHERE id = $7`,
+      [description, discount_type, value, expires_at, min_order_cents, max_uses, id]
+    );
+    res.redirect('/admin/promo-codes?updated=1');
+  })
+);
+
 router.get(
   '/reservations',
   asyncHandler(async (req, res) => {
@@ -182,7 +298,9 @@ router.get(
     res.render('admin/promo-codes', {
       title: 'Промокоды',
       promos,
+      formatPrice,
       created: req.query.created === '1',
+      updated: req.query.updated === '1',
     });
   })
 );

src/routes/shop.js

@@ -5,6 +5,7 @@ const { requireAuth } = require('../middleware/auth');
 const { requireCookieConsent } = require('../middleware/cookieConsent');
 const { asyncHandler } = require('../utils/asyncHandler');
 const { buildCartPricing } = require('../services/pricing');
+const productPrice = require('../utils/productPrice');
 const promoService = require('../services/promo');
 const loyaltyService = require('../services/loyalty');
 
@@ -18,6 +19,9 @@ function enrichLocals(req, res) {
 
 router.use((req, res, next) => {
   enrichLocals(req, res);
+  res.locals.isSaleActive = productPrice.isSaleActive;
+  res.locals.effectivePrice = productPrice.getEffectivePriceCents;
+  res.locals.salePercent = productPrice.salePercent;
   next();
 });
 
@@ -327,7 +331,7 @@ router.post(
         await client.query(
           `INSERT INTO order_items (order_id, product_id, quantity, price_cents)
            VALUES ($1, $2, $3, $4)`,
-          [orderId, item.id, item.quantity, item.price_cents]
+          [orderId, item.id, item.quantity, item.effective_price_cents ?? item.price_cents]
         );
         await client.query('UPDATE products SET stock = stock - $1 WHERE id = $2', [
           item.quantity,