v0.30: product pages, categories, sale prices and order status timeline

README.md

@@ -1,8 +1,20 @@
 # Shop — Интернет-магазин
 
-Главная страница интернет-магазина на **Go**, **PostgreSQL 17**, **Docker Compose** и **Caddy** (обратный прокси + SSL).
+Полнофункциональный интернет-магазин на **Go**, **PostgreSQL 17**, **Docker Compose** и **Caddy**.
 
-Проект настроен для развёртывания на **Ubuntu 22.04 / 24.04**.
+**Текущая версия:** `v0.30-beta`
+
+## Возможности
+
+| Модуль | Описание |
+|--------|----------|
+| Каталог | Главная, категории, карточки товаров со скидками |
+| Товар | Страница `/product/{id}` с описанием, фото и скриншотами |
+| Категории | `/category/{slug}` — управление в админке |
+| Корзина | Добавление, изменение количества, расчёт со скидкой |
+| Заказы | Оформление гостем или зарегистрированным пользователем |
+| Личный кабинет | Профиль, история заказов со статус-таймлайном |
+| Админка | Товары, категории, скриншоты, редактор Quill, статистика |
 
 ## Стек
 
@@ -12,164 +24,108 @@
 | База данных | PostgreSQL 17 |
 | Прокси / SSL | Caddy 2 |
 | ОС | Ubuntu 22.04 / 24.04 |
-| Контейнеризация | Docker Compose |
 
-## Быстрый старт на Ubuntu
+## Быстрый старт (Ubuntu)
 
 ```bash
-# Клонировать репозиторий
 git clone https://git.evilfox.cc/test2/shop-go.git /opt/shop
 cd /opt/shop
-
+sudo bash setup.sh
-# 1. Установить Docker (один раз, с sudo)
-sudo ./scripts/install-ubuntu.sh
-
-# Перелогиниться или:
-newgrp docker
-
-# 2. Запустить магазин
-chmod +x scripts/*.sh
-./scripts/deploy.sh
 ```
 
-Откройте в браузере:
+Или обновление существующего:
-- `http://IP_СЕРВЕРА` — магазин
-- `http://IP_СЕРВЕРА/admin/login` — админка
-
-Или через Make:
 
 ```bash
-make install   # sudo, установка Docker
+cd /opt/shop
-make deploy    # первый запуск
+bash scripts/redeploy.sh
-make logs      # просмотр логов
 ```
 
-## Продакшен с доменом и SSL
+Проверка версии:
-
-1. Настройте DNS: A-запись домена → IP сервера Ubuntu
-2. Откройте порты 80 и 443 (скрипт `install-ubuntu.sh` настраивает ufw)
-3. Включите SSL:
 
 ```bash
-./scripts/enable-ssl.sh shop.example.com admin@example.com
+curl http://localhost/health
+# {"status":"ok","version":"v0.30-beta"}
 ```
 
-Или:
+## Маршруты магазина
 
-```bash
+| Путь | Описание |
-make ssl DOMAIN=shop.example.com EMAIL=admin@example.com
+|------|----------|
-```
+| `/` | Главная |
+| `/product/{id}` | Страница товара |
+| `/category/{slug}` | Категория |
+| `/cart` | Корзина |
+| `/checkout` | Оформление заказа |
+| `/register`, `/login` | Регистрация и вход |
+| `/account` | Личный кабинет |
+| `/admin/` | Админ-панель |
 
-Caddy автоматически получит сертификат Let's Encrypt.
+## Скидки
 
-Вручную через `.env`:
+В админке при редактировании товара укажите **Цена** и **Цена со скидкой**.  
+На сайте отображается старая цена зачёркнутой и бейдж `-N%`.
 
-```env
+## Категории
-DOMAIN=shop.example.com
-CADDY_EMAIL=admin@example.com
-CADDYFILE=./Caddyfile.prod
-```
 
-Затем: `docker compose up -d --force-recreate caddy`
+Админка → **Категории** → добавьте категорию → при создании товара выберите её в списке.
 
-## Автозапуск при загрузке Ubuntu
+## Статусы заказов
 
-```bash
+| Код | Отображение |
-sudo cp systemd/shop.service /etc/systemd/system/
+|-----|-------------|
-# Отредактируйте WorkingDirectory, если проект не в /opt/shop
+| `new` | Новый |
-sudo systemctl daemon-reload
+| `confirmed` | Подтверждён |
-sudo systemctl enable --now shop
+| `processing` | В обработке |
-```
+| `shipped` | Отправлен |
+| `delivered` | Доставлен |
+| `cancelled` | Отменён |
+
+В личном кабинете — цветной бейдж и таймлайн прогресса.
 
 ## Админ
 
-Администратор создаётся автоматически при старте из `.env`:
-
 ```env
 ADMIN_EMAIL=admin@shop.local
 ADMIN_PASSWORD=change_me
 SESSION_SECRET=your_random_secret_key_here
 ```
 
-Скрипт `deploy.sh` генерирует пароли автоматически при первом запуске.
-
 Вход: `/admin/login`
 
-При изменении `ADMIN_PASSWORD` пароль обновится в БД при следующем запуске.
+## SSL
-
-## Сервисы
-
-| Сервис | Порт | Описание |
-|--------|------|----------|
-| Caddy | 80, 443 | Обратный прокси, SSL |
-| App | 8080 (внутри) | Go-приложение |
-| PostgreSQL | 5432 (внутри) | База данных |
-
-## Обновление на сервере
 
 ```bash
-./scripts/update.sh
+./scripts/enable-ssl.sh shop.example.com admin@example.com
-# или
-make update
 ```
 
-## Локальная разработка (Ubuntu)
+## Обновление
 
 ```bash
-# Только PostgreSQL в Docker
+bash scripts/redeploy.sh
-docker compose up db -d
-
-export DB_HOST=localhost DB_USER=shop DB_PASSWORD=shop_secret DB_NAME=shop
-export ADMIN_EMAIL=admin@shop.local ADMIN_PASSWORD=change_me
-
-go mod tidy
-go run ./cmd/shop
-# http://localhost:8080
 ```
 
-## Структура проекта
+Скрипт делает `git reset --hard`, пересборку Docker без кэша и проверку `/health`.
+
+## Структура
 
 ```
 shop/
-├── cmd/shop/main.go
+├── cmd/shop/           # Точка входа
 ├── internal/
+│   ├── handlers/       # HTTP, шаблоны, статика
+│   ├── repository/     # БД
+│   ├── orderstatus/    # Статусы заказов
+│   └── ...
 ├── migrations/
 ├── scripts/
-│   ├── install-ubuntu.sh   # установка Docker + ufw
+│   ├── deploy.sh
-│   ├── deploy.sh           # первый запуск
+│   ├── redeploy.sh     # Полное обновление
-│   ├── enable-ssl.sh       # SSL для домена
+│   └── update.sh
-│   └── update.sh           # обновление
+└── docker-compose.yml
-├── systemd/shop.service    # автозапуск
-├── Caddyfile               # HTTP (IP / localhost)
-├── Caddyfile.prod          # HTTPS (домен)
-├── docker-compose.yml
-├── Makefile
-└── Dockerfile
 ```
 
-## API
+## Требования
 
-| Метод | Путь | Описание |
+- Ubuntu 22.04 / 24.04
-|-------|------|----------|
+- 1 CPU, 1 GB RAM
-| GET | `/` | Главная страница |
+- Порты 22, 80, 443
-| GET | `/health` | Health check |
-| GET | `/static/*` | CSS и статика |
-| GET | `/admin/login` | Страница входа |
-| POST | `/admin/login` | Авторизация |
-| GET | `/admin/` | Админ-панель |
-| POST | `/admin/logout` | Выход |
-
-## Остановка
-
-```bash
-docker compose down
-
-# С удалением данных БД
-docker compose down -v
-```
-
-## Требования к серверу Ubuntu
-
-- 1 CPU, 1 GB RAM (минимум)
-- Ubuntu 22.04 или 24.04 LTS
-- Открытые порты 22 (SSH), 80, 443

cmd/shop/main.go

@@ -34,6 +34,7 @@ func main() {
 	}
 
 	productRepo := repository.NewProductRepository(pool)
+	categoryRepo := repository.NewCategoryRepository(pool)
 	adminRepo := repository.NewAdminRepository(pool)
 	statsRepo := repository.NewStatsRepository(pool)
 	userRepo := repository.NewUserRepository(pool)
@@ -62,10 +63,10 @@ func main() {
 	cartSession := auth.NewSession(cfg.SessionSecret, "shop_cart_key", "/")
 
 	customer := handlers.NewCustomerHandler(
-		productRepo, userRepo, cartRepo, orderRepo, statsRepo,
+		productRepo, categoryRepo, userRepo, cartRepo, orderRepo, statsRepo,
 		userSession, cartSession, tmpl,
 	)
-	admin := handlers.NewAdminHandler(adminRepo, productRepo, statsRepo, storage, adminSession, tmpl)
+	admin := handlers.NewAdminHandler(adminRepo, productRepo, categoryRepo, statsRepo, storage, adminSession, tmpl)
 
 	mux := http.NewServeMux()
 	mux.Handle("GET /static/", http.StripPrefix("/static/", handlers.StaticHandler()))
@@ -73,6 +74,8 @@ func main() {
 	mux.HandleFunc("GET /health", customer.Health)
 
 	mux.HandleFunc("GET /{$}", customer.Home)
+	mux.HandleFunc("GET /product/{id}", customer.ProductPage)
+	mux.HandleFunc("GET /category/{slug}", customer.CategoryPage)
 	mux.HandleFunc("GET /register", customer.RegisterPage)
 	mux.HandleFunc("POST /register", customer.Register)
 	mux.HandleFunc("GET /login", customer.LoginPage)
@@ -97,6 +100,9 @@ func main() {
 	mux.HandleFunc("GET /admin/products/{id}/edit", admin.ProductEdit)
 	mux.HandleFunc("POST /admin/products/{id}/delete", admin.ProductDelete)
 	mux.HandleFunc("POST /admin/products/{id}/images/{imageId}/delete", admin.ImageDelete)
+	mux.HandleFunc("GET /admin/categories", admin.CategoryList)
+	mux.HandleFunc("POST /admin/categories", admin.CategoryCreate)
+	mux.HandleFunc("POST /admin/categories/{id}/delete", admin.CategoryDelete)
 
 	addr := ":" + getEnv("APP_PORT", "8080")
 	srv := &http.Server{

docker-compose.yml

@@ -14,6 +14,7 @@ services:
       - ./migrations/002_admins.sql:/docker-entrypoint-initdb.d/002_admins.sql:ro
       - ./migrations/003_admin_features.sql:/docker-entrypoint-initdb.d/003_admin_features.sql:ro
       - ./migrations/004_users_cart_orders.sql:/docker-entrypoint-initdb.d/004_users_cart_orders.sql:ro
+      - ./migrations/005_categories_sale.sql:/docker-entrypoint-initdb.d/005_categories_sale.sql:ro
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-shop} -d ${DB_NAME:-shop}"]
       interval: 5s

internal/database/migrate.go

@@ -77,6 +77,25 @@ func Migrate(ctx context.Context, pool *pgxpool.Pool) error {
 			quantity INT NOT NULL CHECK (quantity > 0)
 		)`,
 		`CREATE INDEX IF NOT EXISTS idx_orders_user ON orders (user_id)`,
+		`CREATE TABLE IF NOT EXISTS categories (
+			id SERIAL PRIMARY KEY,
+			name VARCHAR(100) NOT NULL UNIQUE,
+			slug VARCHAR(100) NOT NULL UNIQUE,
+			description TEXT NOT NULL DEFAULT '',
+			sort_order INT NOT NULL DEFAULT 0,
+			created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)`,
+		`ALTER TABLE products ADD COLUMN IF NOT EXISTS category_id INT REFERENCES categories(id) ON DELETE SET NULL`,
+		`ALTER TABLE products ADD COLUMN IF NOT EXISTS sale_price NUMERIC(10,2)`,
+		`INSERT INTO categories (name, slug, sort_order) VALUES
+			('Электроника', 'elektronika', 1),
+			('Одежда', 'odezhda', 2),
+			('Дом и сад', 'dom-i-sad', 3),
+			('Аксессуары', 'aksessuary', 4),
+			('Разное', 'raznoe', 5)
+		ON CONFLICT (slug) DO NOTHING`,
+		`UPDATE products p SET category_id = c.id
+		 FROM categories c WHERE p.category = c.name AND p.category_id IS NULL`,
 	}
 
 	for _, q := range queries {

internal/handlers/admin.go

@@ -15,6 +15,7 @@ import (
 type AdminHandler struct {
 	repo       *repository.AdminRepository
 	products   *repository.ProductRepository
+	categories *repository.CategoryRepository
 	stats      *repository.StatsRepository
 	storage    *upload.Storage
 	session    *auth.Session
@@ -55,13 +56,21 @@ type adminProductFormData struct {
 	Title      string
 	Email      string
 	Product    models.Product
+	Categories []models.Category
 	IsNew      bool
 	Error      string
 }
 
+type adminCategoriesData struct {
+	Title      string
+	Email      string
+	Categories []models.Category
+}
+
 func NewAdminHandler(
 	adminRepo *repository.AdminRepository,
 	productRepo *repository.ProductRepository,
+	categoryRepo *repository.CategoryRepository,
 	statsRepo *repository.StatsRepository,
 	storage *upload.Storage,
 	session *auth.Session,
@@ -70,6 +79,7 @@ func NewAdminHandler(
 	return &AdminHandler{
 		repo:       adminRepo,
 		products:   productRepo,
+		categories: categoryRepo,
 		stats:      statsRepo,
 		storage:    storage,
 		session:    session,

internal/handlers/admin_categories.go

@@ -0,0 +1,64 @@
+package handlers
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"strconv"
+
+	"shop/internal/models"
+)
+
+func (h *AdminHandler) CategoryList(w http.ResponseWriter, r *http.Request) {
+	email, ok := h.requireAuth(w, r)
+	if !ok {
+		return
+	}
+	list, err := h.categories.All(r.Context())
+	if err != nil {
+		log.Printf("categories: %v", err)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	h.render(w, "admin_categories.html", adminCategoriesData{
+		Title:      "Категории",
+		Email:      email,
+		Categories: list,
+	})
+}
+
+func (h *AdminHandler) CategoryCreate(w http.ResponseWriter, r *http.Request) {
+	if _, ok := h.requireAuth(w, r); !ok {
+		return
+	}
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, "Bad Request", http.StatusBadRequest)
+		return
+	}
+	name := r.FormValue("name")
+	desc := r.FormValue("description")
+	if name == "" {
+		http.Redirect(w, r, "/admin/categories", http.StatusSeeOther)
+		return
+	}
+	if _, err := h.categories.Create(r.Context(), name, desc); err != nil {
+		log.Printf("category create: %v", err)
+	}
+	http.Redirect(w, r, "/admin/categories", http.StatusSeeOther)
+}
+
+func (h *AdminHandler) CategoryDelete(w http.ResponseWriter, r *http.Request) {
+	if _, ok := h.requireAuth(w, r); !ok {
+		return
+	}
+	id, _ := strconv.Atoi(r.PathValue("id"))
+	if id > 0 {
+		_ = h.categories.Delete(r.Context(), id)
+	}
+	http.Redirect(w, r, "/admin/categories", http.StatusSeeOther)
+}
+
+func (h *AdminHandler) loadCategories(ctx context.Context) []models.Category {
+	list, _ := h.categories.All(ctx)
+	return list
+}

internal/handlers/admin_products.go

@@ -38,7 +38,8 @@ func (h *AdminHandler) ProductNew(w http.ResponseWriter, r *http.Request) {
 		Title:      "Новый товар",
 		Email:      email,
 		IsNew:      true,
-		Product: models.Product{IsActive: true, Category: "Разное"},
+		Categories: h.loadCategories(r.Context()),
+		Product:    models.Product{IsActive: true},
 	})
 }
 
@@ -64,6 +65,7 @@ func (h *AdminHandler) ProductEdit(w http.ResponseWriter, r *http.Request) {
 		Title:      "Редактирование товара",
 		Email:      email,
 		Product:    product,
+		Categories: h.loadCategories(r.Context()),
 	})
 }
 
@@ -82,13 +84,27 @@ func (h *AdminHandler) ProductSave(w http.ResponseWriter, r *http.Request) {
 	productID, _ := strconv.Atoi(r.FormValue("id"))
 
 	price, _ := strconv.ParseFloat(r.FormValue("price"), 64)
+	salePrice, _ := strconv.ParseFloat(r.FormValue("sale_price"), 64)
+	categoryID, _ := strconv.Atoi(r.FormValue("category_id"))
+
+	var catID *int
+	var categoryName string
+	if categoryID > 0 {
+		catID = &categoryID
+		if cat, err := h.categories.GetByID(ctx, categoryID); err == nil {
+			categoryName = cat.Name
+		}
+	}
+
 	product := models.Product{
 		ID:          productID,
 		Name:        r.FormValue("name"),
 		Description: r.FormValue("description"),
 		Details:     r.FormValue("details"),
 		Price:       price,
-		Category:    r.FormValue("category"),
+		SalePrice:   salePrice,
+		Category:    categoryName,
+		CategoryID:  catID,
 		IsActive:    r.FormValue("is_active") == "on",
 		ImageURL:    r.FormValue("image_url"),
 	}
@@ -99,6 +115,7 @@ func (h *AdminHandler) ProductSave(w http.ResponseWriter, r *http.Request) {
 			Title:      "Ошибка",
 			Email:      email,
 			Product:    product,
+			Categories: h.loadCategories(ctx),
 			IsNew:      isNew,
 			Error:      "Заполните название и цену",
 		})

internal/handlers/customer.go

@@ -15,6 +15,7 @@ import (
 
 type CustomerHandler struct {
 	products    *repository.ProductRepository
+	categories  *repository.CategoryRepository
 	users       *repository.UserRepository
 	cart        *repository.CartRepository
 	orders      *repository.OrderRepository
@@ -59,8 +60,20 @@ type accountPage struct {
 	Address string
 }
 
+type productPage struct {
+	shopPage
+	Product models.Product
+}
+
+type categoryPage struct {
+	shopPage
+	Category models.Category
+	Products []models.Product
+}
+
 func NewCustomerHandler(
 	products *repository.ProductRepository,
+	categories *repository.CategoryRepository,
 	users *repository.UserRepository,
 	cart *repository.CartRepository,
 	orders *repository.OrderRepository,
@@ -69,7 +82,7 @@ func NewCustomerHandler(
 	templates *template.Template,
 ) *CustomerHandler {
 	return &CustomerHandler{
-		products: products, users: users, cart: cart, orders: orders, stats: stats,
+		products: products, categories: categories, users: users, cart: cart, orders: orders, stats: stats,
 		userSession: userSession, cartSession: cartSession, templates: templates,
 	}
 }
@@ -121,6 +134,40 @@ func (h *CustomerHandler) Home(w http.ResponseWriter, r *http.Request) {
 	h.render(w, "home.html", p)
 }
 
+func (h *CustomerHandler) ProductPage(w http.ResponseWriter, r *http.Request) {
+	id, err := strconv.Atoi(r.PathValue("id"))
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+	product, err := h.products.GetActiveByID(r.Context(), id)
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+	p := productPage{
+		shopPage: h.basePage(r, w, product.Name),
+		Product:  product,
+	}
+	h.render(w, "product.html", p)
+}
+
+func (h *CustomerHandler) CategoryPage(w http.ResponseWriter, r *http.Request) {
+	slug := r.PathValue("slug")
+	cat, err := h.categories.GetBySlug(r.Context(), slug)
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+	products, _ := h.products.ByCategoryID(r.Context(), cat.ID)
+	p := categoryPage{
+		shopPage: h.basePage(r, w, cat.Name),
+		Category: cat,
+		Products: products,
+	}
+	h.render(w, "category.html", p)
+}
+
 func (h *CustomerHandler) RegisterPage(w http.ResponseWriter, r *http.Request) {
 	if _, ok := auth.UserIDFromSession(h.userSession, r); ok {
 		http.Redirect(w, r, "/account", http.StatusSeeOther)

internal/handlers/home.go

@@ -7,6 +7,9 @@ import (
 	"log"
 	"net/http"
 	"regexp"
+
+	"shop/internal/models"
+	"shop/internal/orderstatus"
 )
 
 //go:embed templates/*
@@ -21,9 +24,27 @@ func stripHTML(s string) string {
 	return tagRe.ReplaceAllString(s, "")
 }
 
+func effectivePrice(p models.Product) float64 { return p.EffectivePrice() }
+
 func ParseTemplates() (*template.Template, error) {
 	funcMap := template.FuncMap{
 		"plain":         stripHTML,
+		"effective":     effectivePrice,
+		"safeHTML":      func(s string) template.HTML { return template.HTML(s) },
+		"orderLabel":    orderstatus.Label,
+		"orderClass":    orderstatus.Class,
+		"orderStep":     orderstatus.Step,
+		"orderTimeline": func() []string { return orderstatus.Timeline },
+		"stepDone": func(status, step string) bool {
+			cur, s := orderstatus.Step(status), orderstatus.Step(step)
+			return cur > 0 && s > 0 && s < cur
+		},
+		"stepCurrent": func(status, step string) bool {
+			return orderstatus.Step(status) == orderstatus.Step(step)
+		},
+		"catSelected": func(catID int, productCatID *int) bool {
+			return productCatID != nil && *productCatID == catID
+		},
 	}
 	return template.New("").Funcs(funcMap).ParseFS(templateFS, "templates/*.html")
 }

internal/handlers/static/css/shop.css

@@ -250,7 +250,210 @@
     margin: 0;
 }
 
+/* Цены со скидкой */
+.price-block {
+    display: flex;
+    align-items: baseline;
+    gap: 8px;
+    flex-wrap: wrap;
+}
+
+.price-block__old {
+    text-decoration: line-through;
+    color: #9ca3af;
+    font-size: 0.9rem;
+}
+
+.price-block__sale,
+.price-block__current {
+    font-size: 1.25rem;
+    font-weight: 700;
+    color: #ef4444;
+}
+
+.price-block--lg .price-block__sale,
+.price-block--lg .price-block__current {
+    font-size: 2rem;
+}
+
+.price-block__badge {
+    background: #fef2f2;
+    color: #b91c1c;
+    padding: 4px 10px;
+    border-radius: 100px;
+    font-size: 0.85rem;
+    font-weight: 600;
+}
+
+/* Страница товара */
+.breadcrumb {
+    display: flex;
+    gap: 8px;
+    font-size: 0.875rem;
+    color: #6b7280;
+    margin-bottom: 24px;
+    flex-wrap: wrap;
+}
+
+.breadcrumb a {
+    color: #4f46e5;
+    text-decoration: none;
+}
+
+.product-detail {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 40px;
+    margin-bottom: 40px;
+}
+
+.product-detail__main {
+    width: 100%;
+    border-radius: 16px;
+    border: 1px solid #e5e7eb;
+}
+
+.product-detail__thumbs {
+    display: flex;
+    gap: 8px;
+    margin-top: 12px;
+    flex-wrap: wrap;
+}
+
+.product-detail__thumbs img {
+    width: 72px;
+    height: 72px;
+    object-fit: cover;
+    border-radius: 8px;
+    border: 1px solid #e5e7eb;
+    cursor: pointer;
+}
+
+.product-detail__cat {
+    color: #4f46e5;
+    text-decoration: none;
+    font-size: 0.875rem;
+    font-weight: 600;
+}
+
+.product-detail__info h1 {
+    font-size: 2rem;
+    margin: 12px 0 20px;
+}
+
+.product-detail__short {
+    color: #6b7280;
+    margin: 20px 0;
+    line-height: 1.6;
+}
+
+.product-detail__buy {
+    display: flex;
+    gap: 12px;
+    align-items: center;
+}
+
+.qty-input {
+    width: 72px;
+    padding: 12px;
+    border: 1px solid #e5e7eb;
+    border-radius: 10px;
+    font-size: 1rem;
+}
+
+.product-detail__html {
+    line-height: 1.7;
+    color: #374151;
+}
+
+.product-detail__html h1,
+.product-detail__html h2,
+.product-detail__html h3 {
+    margin: 1em 0 0.5em;
+}
+
+/* Статусы заказов */
+.order-card__head {
+    justify-content: space-between;
+}
+
+.order-card__date {
+    display: block;
+    font-size: 0.8rem;
+    color: #9ca3af;
+    margin-top: 2px;
+}
+
+.order-status {
+    padding: 6px 14px;
+    border-radius: 100px;
+    font-size: 0.8rem;
+    font-weight: 600;
+}
+
+.status--new { background: #dbeafe; color: #1d4ed8; }
+.status--confirmed { background: #e0e7ff; color: #4338ca; }
+.status--processing { background: #ede9fe; color: #6d28d9; }
+.status--shipped { background: #ffedd5; color: #c2410c; }
+.status--delivered { background: #d1fae5; color: #065f46; }
+.status--cancelled { background: #f3f4f6; color: #6b7280; }
+
+.order-timeline {
+    display: flex;
+    gap: 4px;
+    margin: 16px 0;
+    padding: 16px 0;
+    overflow-x: auto;
+}
+
+.order-timeline__step {
+    flex: 1;
+    min-width: 80px;
+    text-align: center;
+    position: relative;
+    opacity: 0.35;
+}
+
+.order-timeline__step--done,
+.order-timeline__step--current {
+    opacity: 1;
+}
+
+.order-timeline__dot {
+    display: block;
+    width: 12px;
+    height: 12px;
+    border-radius: 50%;
+    background: #d1d5db;
+    margin: 0 auto 8px;
+}
+
+.order-timeline__step--done .order-timeline__dot {
+    background: #10b981;
+}
+
+.order-timeline__step--current .order-timeline__dot {
+    background: #4f46e5;
+    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.2);
+}
+
+.order-timeline__label {
+    font-size: 0.7rem;
+    color: #6b7280;
+    line-height: 1.2;
+}
+
+.admin-form--row {
+    flex-direction: row;
+    flex-wrap: wrap;
+    align-items: flex-end;
+}
+
 @media (max-width: 768px) {
+    .product-detail {
+        grid-template-columns: 1fr;
+    }
+}
     .cart-layout,
     .checkout-layout,
     .account-layout {

internal/handlers/static/css/style.css

@@ -337,8 +337,33 @@ body {
     transition: transform 0.3s;
 }
 
-.product-card:hover .product-card__image img {
+.product-card {
-    transform: scale(1.05);
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+.product-card__link {
+    text-decoration: none;
+    color: inherit;
+    flex: 1;
+}
+
+.product-card__cart {
+    padding: 0 20px 20px;
+    margin: 0;
+}
+
+.product-card__sale {
+    position: absolute;
+    top: 12px;
+    right: 12px;
+    background: #ef4444;
+    color: #fff;
+    padding: 4px 8px;
+    border-radius: 6px;
+    font-size: 0.75rem;
+    font-weight: 700;
 }
 
 .product-card__badge {

internal/handlers/templates/admin_categories.html

@@ -0,0 +1,60 @@
+{{define "admin_categories.html"}}
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{.Title}}</title>
+    <link rel="stylesheet" href="/static/css/style.css">
+    <link rel="stylesheet" href="/static/css/admin.css">
+</head>
+<body class="admin-body">
+    {{template "admin_nav" .}}
+    <main class="admin-main container">
+        <h1 class="admin-page-title">Категории</h1>
+
+        <section class="admin-section">
+            <h2 class="admin-section__title">Добавить категорию</h2>
+            <form method="POST" action="/admin/categories" class="admin-form admin-form--row">
+                <label class="admin-form__label">
+                    Название
+                    <input type="text" name="name" class="admin-form__input" required>
+                </label>
+                <label class="admin-form__label">
+                    Описание
+                    <input type="text" name="description" class="admin-form__input">
+                </label>
+                <button type="submit" class="btn btn--primary">Добавить</button>
+            </form>
+        </section>
+
+        <section class="admin-section">
+            <table class="admin-table">
+                <thead>
+                    <tr>
+                        <th>Название</th>
+                        <th>Slug</th>
+                        <th>Товаров</th>
+                        <th></th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {{range .Categories}}
+                    <tr>
+                        <td><strong>{{.Name}}</strong></td>
+                        <td><a href="/category/{{.Slug}}" target="_blank">{{.Slug}}</a></td>
+                        <td>{{.Count}}</td>
+                        <td>
+                            <form method="POST" action="/admin/categories/{{.ID}}/delete" onsubmit="return confirm('Удалить категорию?')">
+                                <button type="submit" class="btn btn--danger btn--sm">Удалить</button>
+                            </form>
+                        </td>
+                    </tr>
+                    {{end}}
+                </tbody>
+            </table>
+        </section>
+    </main>
+</body>
+</html>
+{{end}}

internal/handlers/templates/admin_nav.html

@@ -8,6 +8,7 @@
         <nav class="admin-nav">
             <a href="/admin/" class="admin-nav__link">Главная</a>
             <a href="/admin/products" class="admin-nav__link">Товары</a>
+            <a href="/admin/categories" class="admin-nav__link">Категории</a>
             <a href="/admin/products/new" class="admin-nav__link admin-nav__link--accent">+ Добавить</a>
         </nav>
         <div class="admin-header__user">

internal/handlers/templates/admin_product_form.html

@@ -44,18 +44,21 @@
                             <input type="number" name="price" class="admin-form__input" value="{{printf "%.0f" .Product.Price}}" min="0" step="1" required>
                         </label>
                         <label class="admin-form__label">
-                            Категория
+                            Цена со скидкой (₽)
-                            <input type="text" name="category" class="admin-form__input" value="{{.Product.Category}}" list="categories">
+                            <input type="number" name="sale_price" class="admin-form__input" value="{{if .Product.HasSale}}{{printf "%.0f" .Product.SalePrice}}{{end}}" min="0" step="1" placeholder="Без скидки">
-                            <datalist id="categories">
-                                <option value="Электроника">
-                                <option value="Одежда">
-                                <option value="Дом и сад">
-                                <option value="Аксессуары">
-                                <option value="Разное">
-                            </datalist>
                         </label>
                     </div>
 
+                    <label class="admin-form__label">
+                        Категория
+                        <select name="category_id" class="admin-form__input">
+                            <option value="">— без категории —</option>
+                            {{range .Categories}}
+                            <option value="{{.ID}}" {{if catSelected .ID $.Product.CategoryID}}selected{{end}}>{{.Name}}</option>
+                            {{end}}
+                        </select>
+                    </label>
+
                     <label class="admin-form__checkbox">
                         <input type="checkbox" name="is_active" {{if .Product.IsActive}}checked{{end}}>
                         Показывать в каталоге

internal/handlers/templates/catalog.html

@@ -0,0 +1,99 @@
+{{define "product.html"}}
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{.Product.Name}} — Shop</title>
+    <link rel="stylesheet" href="/static/css/style.css">
+    <link rel="stylesheet" href="/static/css/shop.css">
+</head>
+<body>
+    {{template "shop_header" .}}
+    <main class="shop-page container">
+        <nav class="breadcrumb">
+            <a href="/">Главная</a>
+            {{if .Product.CategorySlug}}
+            <span>/</span>
+            <a href="/category/{{.Product.CategorySlug}}">{{.Product.Category}}</a>
+            {{end}}
+            <span>/</span>
+            <span>{{.Product.Name}}</span>
+        </nav>
+
+        <div class="product-detail">
+            <div class="product-detail__gallery">
+                <img src="{{.Product.ImageURL}}" alt="{{.Product.Name}}" class="product-detail__main">
+                {{if .Product.Images}}
+                <div class="product-detail__thumbs">
+                    {{range .Product.Images}}
+                    <img src="{{.FilePath}}" alt="">
+                    {{end}}
+                </div>
+                {{end}}
+            </div>
+            <div class="product-detail__info">
+                {{if .Product.CategorySlug}}
+                <a href="/category/{{.Product.CategorySlug}}" class="product-detail__cat">{{.Product.Category}}</a>
+                {{end}}
+                <h1>{{.Product.Name}}</h1>
+                <div class="price-block price-block--lg">
+                    {{if .Product.HasSale}}
+                    <span class="price-block__old">{{printf "%.0f" .Product.Price}} ₽</span>
+                    <span class="price-block__sale">{{printf "%.0f" .Product.SalePrice}} ₽</span>
+                    <span class="price-block__badge">-{{.Product.DiscountPercent}}%</span>
+                    {{else}}
+                    <span class="price-block__current">{{printf "%.0f" .Product.Price}} ₽</span>
+                    {{end}}
+                </div>
+                <p class="product-detail__short">{{plain .Product.Description}}</p>
+                <form method="POST" action="/cart/add" class="product-detail__buy">
+                    <input type="hidden" name="product_id" value="{{.Product.ID}}">
+                    <input type="number" name="quantity" value="1" min="1" max="99" class="qty-input">
+                    <button type="submit" class="btn btn--primary btn--lg">Добавить в корзину</button>
+                </form>
+            </div>
+        </div>
+
+        {{if .Product.Details}}
+        <section class="product-detail__content shop-card">
+            <h2>Описание</h2>
+            <div class="product-detail__html">{{safeHTML .Product.Details}}</div>
+        </section>
+        {{end}}
+    </main>
+</body>
+</html>
+{{end}}
+
+{{define "category.html"}}
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{.Category.Name}} — Shop</title>
+    <link rel="stylesheet" href="/static/css/style.css">
+    <link rel="stylesheet" href="/static/css/shop.css">
+</head>
+<body>
+    {{template "shop_header" .}}
+    <main class="shop-page container">
+        <nav class="breadcrumb">
+            <a href="/">Главная</a>
+            <span>/</span>
+            <span>{{.Category.Name}}</span>
+        </nav>
+        <h1>{{.Category.Name}}</h1>
+        {{if .Category.Description}}<p class="shop-hint">{{.Category.Description}}</p>{{end}}
+        <div class="products">
+            {{range .Products}}
+            {{template "product_card" .}}
+            {{else}}
+            <p class="empty">В этой категории пока нет товаров.</p>
+            {{end}}
+        </div>
+    </main>
+</body>
+</html>
+{{end}}

internal/handlers/templates/home.html

@@ -43,7 +43,7 @@
             <h2 class="section__title">Популярные категории</h2>
             <div class="categories">
                 {{range .Categories}}
-                <a href="#catalog" class="category-card">
+                <a href="/category/{{.Slug}}" class="category-card">
                     <span class="category-card__name">{{.Name}}</span>
                     <span class="category-card__count">{{.Count}} товаров</span>
                 </a>
@@ -60,24 +60,7 @@
             </div>
             <div class="products">
                 {{range .Products}}
-                <article class="product-card">
+                {{template "product_card" .}}
-                    <div class="product-card__image">
-                        <img src="{{.ImageURL}}" alt="{{.Name}}" loading="lazy">
-                        <span class="product-card__badge">{{.Category}}</span>
-                    </div>
-                    <div class="product-card__body">
-                        <h3 class="product-card__title">{{.Name}}</h3>
-                        <p class="product-card__desc">{{plain .Description}}</p>
-                        <div class="product-card__footer">
-                            <span class="product-card__price">{{printf "%.0f" .Price}} ₽</span>
-                            <form method="POST" action="/cart/add">
-                                <input type="hidden" name="product_id" value="{{.ID}}">
-                                <input type="hidden" name="quantity" value="1">
-                                <button type="submit" class="btn btn--primary btn--sm">В корзину</button>
-                            </form>
-                        </div>
-                    </div>
-                </article>
                 {{else}}
                 <p class="empty">Товары скоро появятся в каталоге.</p>
                 {{end}}

internal/handlers/templates/product_card.html

@@ -0,0 +1,30 @@
+{{define "product_card"}}
+<article class="product-card">
+    <a href="/product/{{.ID}}" class="product-card__link">
+        <div class="product-card__image">
+            <img src="{{.ImageURL}}" alt="{{.Name}}" loading="lazy">
+            {{if .HasSale}}<span class="product-card__sale">-{{.DiscountPercent}}%</span>{{end}}
+            <span class="product-card__badge">{{.Category}}</span>
+        </div>
+        <div class="product-card__body">
+            <h3 class="product-card__title">{{.Name}}</h3>
+            <p class="product-card__desc">{{plain .Description}}</p>
+            <div class="product-card__footer">
+                <div class="price-block">
+                    {{if .HasSale}}
+                    <span class="price-block__old">{{printf "%.0f" .Price}} ₽</span>
+                    <span class="product-card__price price-block__sale">{{printf "%.0f" .SalePrice}} ₽</span>
+                    {{else}}
+                    <span class="product-card__price">{{printf "%.0f" .Price}} ₽</span>
+                    {{end}}
+                </div>
+            </div>
+        </div>
+    </a>
+    <form method="POST" action="/cart/add" class="product-card__cart">
+        <input type="hidden" name="product_id" value="{{.ID}}">
+        <input type="hidden" name="quantity" value="1">
+        <button type="submit" class="btn btn--primary btn--sm">В корзину</button>
+    </form>
+</article>
+{{end}}

internal/handlers/templates/shop_header.html

@@ -6,9 +6,9 @@
             <span class="logo__text">Shop</span>
         </a>
         <nav class="nav">
+            <a href="/#catalog" class="nav__link">Каталог</a>
             <a href="/#catalog" class="nav__link">Каталог</a>
             <a href="/#categories" class="nav__link">Категории</a>
-            <a href="/#delivery" class="nav__link">Доставка</a>
         </nav>
         <div class="header__actions">
             {{if .User}}

internal/handlers/templates/shop_pages.html

@@ -19,8 +19,15 @@
                 <div class="cart-item">
                     <img src="{{.Product.ImageURL}}" alt="{{.Product.Name}}" class="cart-item__img">
                     <div class="cart-item__info">
-                        <h3>{{.Product.Name}}</h3>
+                        <h3><a href="/product/{{.ProductID}}">{{.Product.Name}}</a></h3>
-                        <p class="cart-item__price">{{printf "%.0f" .Product.Price}} ₽</p>
+                        <div class="price-block">
+                            {{if .Product.HasSale}}
+                            <span class="price-block__old">{{printf "%.0f" .Product.Price}} ₽</span>
+                            <span class="price-block__sale">{{printf "%.0f" .Product.SalePrice}} ₽</span>
+                            {{else}}
+                            <span class="cart-item__price">{{printf "%.0f" .Product.Price}} ₽</span>
+                            {{end}}
+                        </div>
                     </div>
                     <form method="POST" action="/cart/update" class="cart-item__qty">
                         <input type="hidden" name="product_id" value="{{.ProductID}}">
@@ -164,10 +171,24 @@
                 {{range .Orders}}
                 <div class="order-card">
                     <div class="order-card__head">
+                        <div>
                             <strong>Заказ #{{.ID}}</strong>
-                        <span>{{.CreatedAt.Format "02.01.2006 15:04"}}</span>
+                            <span class="order-card__date">{{.CreatedAt.Format "02.01.2006 15:04"}}</span>
-                        <span class="admin-badge admin-badge--ok">{{.Status}}</span>
                         </div>
+                        <span class="order-status {{orderClass .Status}}">{{orderLabel .Status}}</span>
+                    </div>
+
+                    {{if ne .Status "cancelled"}}
+                    <div class="order-timeline">
+                        {{range orderTimeline}}
+                        <div class="order-timeline__step {{if stepCurrent $.Status .}}order-timeline__step--current{{end}} {{if stepDone $.Status .}}order-timeline__step--done{{end}}">
+                            <span class="order-timeline__dot"></span>
+                            <span class="order-timeline__label">{{orderLabel .}}</span>
+                        </div>
+                        {{end}}
+                    </div>
+                    {{end}}
+
                     <ul class="order-card__items">
                         {{range .Items}}
                         <li>{{.ProductName}} × {{.Quantity}} — {{printf "%.0f" .Price}} ₽</li>

internal/models/product.go

@@ -8,14 +8,35 @@ type Product struct {
 	Description  string
 	Details      string
 	Price        float64
+	SalePrice    float64
 	ImageURL     string
 	Category     string
+	CategoryID   *int
+	CategorySlug string
 	IsActive     bool
 	CreatedAt    time.Time
 	UpdatedAt    time.Time
 	Images       []ProductImage
 }
 
+func (p Product) EffectivePrice() float64 {
+	if p.SalePrice > 0 && p.SalePrice < p.Price {
+		return p.SalePrice
+	}
+	return p.Price
+}
+
+func (p Product) HasSale() bool {
+	return p.SalePrice > 0 && p.SalePrice < p.Price
+}
+
+func (p Product) DiscountPercent() int {
+	if !p.HasSale() || p.Price <= 0 {
+		return 0
+	}
+	return int((1 - p.SalePrice/p.Price) * 100)
+}
+
 type ProductImage struct {
 	ID        int
 	ProductID int
@@ -26,8 +47,11 @@ type ProductImage struct {
 }
 
 type Category struct {
+	ID          int
 	Name        string
 	Slug        string
+	Description string
+	SortOrder   int
 	Count       int
 }
 

internal/orderstatus/status.go

@@ -0,0 +1,37 @@
+package orderstatus
+
+type Info struct {
+	Label string
+	Class string
+	Step  int
+}
+
+var statuses = map[string]Info{
+	"new":        {Label: "Новый", Class: "status--new", Step: 1},
+	"confirmed":  {Label: "Подтверждён", Class: "status--confirmed", Step: 2},
+	"processing": {Label: "В обработке", Class: "status--processing", Step: 3},
+	"shipped":    {Label: "Отправлен", Class: "status--shipped", Step: 4},
+	"delivered":  {Label: "Доставлен", Class: "status--delivered", Step: 5},
+	"cancelled":  {Label: "Отменён", Class: "status--cancelled", Step: 0},
+}
+
+var Timeline = []string{"new", "confirmed", "processing", "shipped", "delivered"}
+
+func Get(code string) Info {
+	if s, ok := statuses[code]; ok {
+		return s
+	}
+	return Info{Label: code, Class: "status--new", Step: 1}
+}
+
+func Label(code string) string {
+	return Get(code).Label
+}
+
+func Class(code string) string {
+	return Get(code).Class
+}
+
+func Step(code string) int {
+	return Get(code).Step
+}

internal/repository/cart.go

@@ -2,6 +2,7 @@ package repository
 
 import (
 	"context"
+	"database/sql"
 
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
@@ -138,9 +139,12 @@ func (r *CartRepository) ItemCount(ctx context.Context, cartID int) (int, error)
 func (r *CartRepository) Items(ctx context.Context, cartID int) ([]models.CartItem, error) {
 	rows, err := r.pool.Query(ctx, `
 		SELECT ci.id, ci.cart_id, ci.product_id, ci.quantity,
-		       p.id, p.name, p.description, p.details, p.price, p.image_url, p.category, p.is_active, p.created_at, p.updated_at
+		       p.id, p.name, p.description, p.details, p.price, COALESCE(p.sale_price, 0),
+		       p.image_url, COALESCE(c.name, p.category, 'Разное'), p.category_id,
+		       COALESCE(c.slug, ''), p.is_active, p.created_at, p.updated_at
 		FROM cart_items ci
 		JOIN products p ON p.id = ci.product_id
+		LEFT JOIN categories c ON c.id = p.category_id
 		WHERE ci.cart_id = $1 AND p.is_active = true
 		ORDER BY ci.id
 	`, cartID)
@@ -153,12 +157,18 @@ func (r *CartRepository) Items(ctx context.Context, cartID int) ([]models.CartIt
 	for rows.Next() {
 		var ci models.CartItem
 		var p models.Product
+		var catID sql.NullInt64
 		if err := rows.Scan(
 			&ci.ID, &ci.CartID, &ci.ProductID, &ci.Quantity,
-			&p.ID, &p.Name, &p.Description, &p.Details, &p.Price, &p.ImageURL, &p.Category, &p.IsActive, &p.CreatedAt, &p.UpdatedAt,
+			&p.ID, &p.Name, &p.Description, &p.Details, &p.Price, &p.SalePrice,
+			&p.ImageURL, &p.Category, &catID, &p.CategorySlug, &p.IsActive, &p.CreatedAt, &p.UpdatedAt,
 		); err != nil {
 			return nil, err
 		}
+		if catID.Valid {
+			id := int(catID.Int64)
+			p.CategoryID = &id
+		}
 		ci.Product = p
 		items = append(items, ci)
 	}
@@ -168,7 +178,9 @@ func (r *CartRepository) Items(ctx context.Context, cartID int) ([]models.CartIt
 func (r *CartRepository) Total(ctx context.Context, cartID int) (float64, error) {
 	var total float64
 	err := r.pool.QueryRow(ctx, `
-		SELECT COALESCE(SUM(ci.quantity * p.price), 0)
+		SELECT COALESCE(SUM(ci.quantity * CASE
+			WHEN p.sale_price > 0 AND p.sale_price < p.price THEN p.sale_price
+			ELSE p.price END), 0)
 		FROM cart_items ci JOIN products p ON p.id = ci.product_id
 		WHERE ci.cart_id = $1
 	`, cartID).Scan(&total)

internal/repository/category.go

@@ -0,0 +1,125 @@
+package repository
+
+import (
+	"context"
+	"regexp"
+	"strings"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"shop/internal/models"
+)
+
+type CategoryRepository struct {
+	pool *pgxpool.Pool
+}
+
+func NewCategoryRepository(pool *pgxpool.Pool) *CategoryRepository {
+	return &CategoryRepository{pool: pool}
+}
+
+var slugRe = regexp.MustCompile(`[^a-z0-9]+`)
+
+func Slugify(name string) string {
+	translit := map[rune]string{
+		'а': "a", 'б': "b", 'в': "v", 'г': "g", 'д': "d", 'е': "e", 'ё': "e",
+		'ж': "zh", 'з': "z", 'и': "i", 'й': "y", 'к': "k", 'л': "l", 'м': "m",
+		'н': "n", 'о': "o", 'п': "p", 'р': "r", 'с': "s", 'т': "t", 'у': "u",
+		'ф': "f", 'х': "h", 'ц': "ts", 'ч': "ch", 'ш': "sh", 'щ': "sch",
+		'ъ': "", 'ы': "y", 'ь': "", 'э': "e", 'ю': "yu", 'я': "ya",
+	}
+	var b strings.Builder
+	for _, r := range strings.ToLower(name) {
+		if t, ok := translit[r]; ok {
+			b.WriteString(t)
+		} else if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') {
+			b.WriteRune(r)
+		} else if r == ' ' || r == '-' {
+			b.WriteRune('-')
+		}
+	}
+	s := slugRe.ReplaceAllString(b.String(), "-")
+	return strings.Trim(s, "-")
+}
+
+func (r *CategoryRepository) All(ctx context.Context) ([]models.Category, error) {
+	rows, err := r.pool.Query(ctx, `
+		SELECT c.id, c.name, c.slug, c.description, c.sort_order,
+		       COUNT(p.id) FILTER (WHERE p.is_active = true) AS cnt
+		FROM categories c
+		LEFT JOIN products p ON p.category_id = c.id
+		GROUP BY c.id
+		ORDER BY c.sort_order, c.name
+	`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var list []models.Category
+	for rows.Next() {
+		var c models.Category
+		if err := rows.Scan(&c.ID, &c.Name, &c.Slug, &c.Description, &c.SortOrder, &c.Count); err != nil {
+			return nil, err
+		}
+		list = append(list, c)
+	}
+	return list, rows.Err()
+}
+
+func (r *CategoryRepository) GetBySlug(ctx context.Context, slug string) (models.Category, error) {
+	var c models.Category
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, name, slug, description, sort_order FROM categories WHERE slug = $1
+	`, slug).Scan(&c.ID, &c.Name, &c.Slug, &c.Description, &c.SortOrder)
+	return c, err
+}
+
+func (r *CategoryRepository) GetByID(ctx context.Context, id int) (models.Category, error) {
+	var c models.Category
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, name, slug, description, sort_order FROM categories WHERE id = $1
+	`, id).Scan(&c.ID, &c.Name, &c.Slug, &c.Description, &c.SortOrder)
+	return c, err
+}
+
+func (r *CategoryRepository) Create(ctx context.Context, name, description string) (models.Category, error) {
+	slug := Slugify(name)
+	var c models.Category
+	err := r.pool.QueryRow(ctx, `
+		INSERT INTO categories (name, slug, description)
+		VALUES ($1, $2, $3)
+		ON CONFLICT (slug) DO UPDATE SET name = EXCLUDED.name
+		RETURNING id, name, slug, description, sort_order
+	`, name, slug, description).Scan(&c.ID, &c.Name, &c.Slug, &c.Description, &c.SortOrder)
+	return c, err
+}
+
+func (r *CategoryRepository) Update(ctx context.Context, c *models.Category) error {
+	tag, err := r.pool.Exec(ctx, `
+		UPDATE categories SET name = $1, slug = $2, description = $3, sort_order = $4 WHERE id = $5
+	`, c.Name, c.Slug, c.Description, c.SortOrder, c.ID)
+	if err != nil {
+		return err
+	}
+	if tag.RowsAffected() == 0 {
+		return pgx.ErrNoRows
+	}
+	return nil
+}
+
+func (r *CategoryRepository) Delete(ctx context.Context, id int) error {
+	_, err := r.pool.Exec(ctx, `UPDATE products SET category_id = NULL WHERE category_id = $1`, id)
+	if err != nil {
+		return err
+	}
+	tag, err := r.pool.Exec(ctx, `DELETE FROM categories WHERE id = $1`, id)
+	if err != nil {
+		return err
+	}
+	if tag.RowsAffected() == 0 {
+		return pgx.ErrNoRows
+	}
+	return nil
+}

internal/repository/order.go

@@ -37,7 +37,7 @@ func (r *OrderRepository) Create(ctx context.Context, order *models.Order, items
 		_, err = tx.Exec(ctx, `
 			INSERT INTO order_items (order_id, product_id, product_name, price, quantity)
 			VALUES ($1, $2, $3, $4, $5)
-		`, order.ID, item.ProductID, item.Product.Name, item.Product.Price, item.Quantity)
+		`, order.ID, item.ProductID, item.Product.Name, item.Product.EffectivePrice(), item.Quantity)
 		if err != nil {
 			return err
 		}

internal/repository/product.go

@@ -2,8 +2,8 @@ package repository
 
 import (
 	"context"
+	"database/sql"
 	"errors"
-	"fmt"
 
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
@@ -19,25 +19,32 @@ func NewProductRepository(pool *pgxpool.Pool) *ProductRepository {
 	return &ProductRepository{pool: pool}
 }
 
+const productSelect = `
+	SELECT p.id, p.name, p.description, p.details, p.price, COALESCE(p.sale_price, 0),
+	       p.image_url, COALESCE(c.name, p.category, 'Разное'), p.category_id,
+	       COALESCE(c.slug, ''), p.is_active, p.created_at, p.updated_at
+	FROM products p
+	LEFT JOIN categories c ON c.id = p.category_id
+`
+
 func (r *ProductRepository) scanProduct(row pgx.Row) (models.Product, error) {
 	var p models.Product
+	var catID sql.NullInt64
 	err := row.Scan(
-		&p.ID, &p.Name, &p.Description, &p.Details, &p.Price,
+		&p.ID, &p.Name, &p.Description, &p.Details, &p.Price, &p.SalePrice,
-		&p.ImageURL, &p.Category, &p.IsActive, &p.CreatedAt, &p.UpdatedAt,
+		&p.ImageURL, &p.Category, &catID, &p.CategorySlug, &p.IsActive, &p.CreatedAt, &p.UpdatedAt,
 	)
+	if catID.Valid {
+		id := int(catID.Int64)
+		p.CategoryID = &id
+	}
 	return p, err
 }
 
-const productColumns = `id, name, description, details, price, image_url, category, is_active, created_at, updated_at`
-
 func (r *ProductRepository) Featured(ctx context.Context, limit int) ([]models.Product, error) {
-	rows, err := r.pool.Query(ctx, `
+	rows, err := r.pool.Query(ctx, productSelect+`
-		SELECT `+productColumns+`
+		WHERE p.is_active = true
-		FROM products
+		ORDER BY p.created_at DESC LIMIT $1`, limit)
-		WHERE is_active = true
-		ORDER BY created_at DESC
-		LIMIT $1
-	`, limit)
 	if err != nil {
 		return nil, err
 	}
@@ -46,11 +53,18 @@ func (r *ProductRepository) Featured(ctx context.Context, limit int) ([]models.P
 }
 
 func (r *ProductRepository) All(ctx context.Context) ([]models.Product, error) {
-	rows, err := r.pool.Query(ctx, `
+	rows, err := r.pool.Query(ctx, productSelect+` ORDER BY p.created_at DESC`)
-		SELECT `+productColumns+`
+	if err != nil {
-		FROM products
+		return nil, err
-		ORDER BY created_at DESC
+	}
-	`)
+	defer rows.Close()
+	return r.collectProducts(rows)
+}
+
+func (r *ProductRepository) ByCategoryID(ctx context.Context, categoryID int) ([]models.Product, error) {
+	rows, err := r.pool.Query(ctx, productSelect+`
+		WHERE p.is_active = true AND p.category_id = $1
+		ORDER BY p.created_at DESC`, categoryID)
 	if err != nil {
 		return nil, err
 	}
@@ -59,7 +73,17 @@ func (r *ProductRepository) All(ctx context.Context) ([]models.Product, error) {
 }
 
 func (r *ProductRepository) GetByID(ctx context.Context, id int) (models.Product, error) {
-	row := r.pool.QueryRow(ctx, `SELECT `+productColumns+` FROM products WHERE id = $1`, id)
+	row := r.pool.QueryRow(ctx, productSelect+` WHERE p.id = $1`, id)
+	p, err := r.scanProduct(row)
+	if err != nil {
+		return models.Product{}, err
+	}
+	p.Images, err = r.ImagesByProduct(ctx, id)
+	return p, err
+}
+
+func (r *ProductRepository) GetActiveByID(ctx context.Context, id int) (models.Product, error) {
+	row := r.pool.QueryRow(ctx, productSelect+` WHERE p.id = $1 AND p.is_active = true`, id)
 	p, err := r.scanProduct(row)
 	if err != nil {
 		return models.Product{}, err
@@ -70,20 +94,20 @@ func (r *ProductRepository) GetByID(ctx context.Context, id int) (models.Product
 
 func (r *ProductRepository) Create(ctx context.Context, p *models.Product) error {
 	return r.pool.QueryRow(ctx, `
-		INSERT INTO products (name, description, details, price, image_url, category, is_active)
+		INSERT INTO products (name, description, details, price, sale_price, image_url, category, category_id, is_active)
-		VALUES ($1, $2, $3, $4, $5, $6, $7)
+		VALUES ($1, $2, $3, $4, NULLIF($5, 0), $6, $7, $8, $9)
 		RETURNING id, created_at, updated_at
-	`, p.Name, p.Description, p.Details, p.Price, p.ImageURL, p.Category, p.IsActive,
+	`, p.Name, p.Description, p.Details, p.Price, p.SalePrice, p.ImageURL, p.Category, p.CategoryID, p.IsActive,
 	).Scan(&p.ID, &p.CreatedAt, &p.UpdatedAt)
 }
 
 func (r *ProductRepository) Update(ctx context.Context, p *models.Product) error {
 	tag, err := r.pool.Exec(ctx, `
-		UPDATE products
+		UPDATE products SET name = $1, description = $2, details = $3, price = $4,
-		SET name = $1, description = $2, details = $3, price = $4,
+		    sale_price = NULLIF($5, 0), image_url = $6, category = $7, category_id = $8,
-		    image_url = $5, category = $6, is_active = $7, updated_at = NOW()
+		    is_active = $9, updated_at = NOW()
-		WHERE id = $8
+		WHERE id = $10
-	`, p.Name, p.Description, p.Details, p.Price, p.ImageURL, p.Category, p.IsActive, p.ID)
+	`, p.Name, p.Description, p.Details, p.Price, p.SalePrice, p.ImageURL, p.Category, p.CategoryID, p.IsActive, p.ID)
 	if err != nil {
 		return err
 	}
@@ -106,10 +130,12 @@ func (r *ProductRepository) Delete(ctx context.Context, id int) error {
 
 func (r *ProductRepository) Categories(ctx context.Context) ([]models.Category, error) {
 	rows, err := r.pool.Query(ctx, `
-		SELECT category, COUNT(*) AS cnt
+		SELECT c.id, c.name, c.slug, c.description, c.sort_order,
-		FROM products
+		       COUNT(p.id) FILTER (WHERE p.is_active = true)
-		GROUP BY category
+		FROM categories c
-		ORDER BY cnt DESC
+		LEFT JOIN products p ON p.category_id = c.id
+		GROUP BY c.id
+		ORDER BY c.sort_order, c.name
 	`)
 	if err != nil {
 		return nil, err
@@ -119,10 +145,9 @@ func (r *ProductRepository) Categories(ctx context.Context) ([]models.Category,
 	var categories []models.Category
 	for rows.Next() {
 		var c models.Category
-		if err := rows.Scan(&c.Name, &c.Count); err != nil {
+		if err := rows.Scan(&c.ID, &c.Name, &c.Slug, &c.Description, &c.SortOrder, &c.Count); err != nil {
 			return nil, err
 		}
-		c.Slug = c.Name
 		categories = append(categories, c)
 	}
 	return categories, rows.Err()
@@ -131,8 +156,7 @@ func (r *ProductRepository) Categories(ctx context.Context) ([]models.Category,
 func (r *ProductRepository) ImagesByProduct(ctx context.Context, productID int) ([]models.ProductImage, error) {
 	rows, err := r.pool.Query(ctx, `
 		SELECT id, product_id, file_path, is_primary, sort_order, created_at
-		FROM product_images
+		FROM product_images WHERE product_id = $1
-		WHERE product_id = $1
 		ORDER BY is_primary DESC, sort_order ASC, id ASC
 	`, productID)
 	if err != nil {
@@ -154,21 +178,17 @@ func (r *ProductRepository) ImagesByProduct(ctx context.Context, productID int)
 func (r *ProductRepository) AddImage(ctx context.Context, img *models.ProductImage) error {
 	return r.pool.QueryRow(ctx, `
 		INSERT INTO product_images (product_id, file_path, is_primary, sort_order)
-		VALUES ($1, $2, $3, $4)
+		VALUES ($1, $2, $3, $4) RETURNING id, created_at
-		RETURNING id, created_at
+	`, img.ProductID, img.FilePath, img.IsPrimary, img.SortOrder).Scan(&img.ID, &img.CreatedAt)
-	`, img.ProductID, img.FilePath, img.IsPrimary, img.SortOrder,
-	).Scan(&img.ID, &img.CreatedAt)
 }
 
 func (r *ProductRepository) DeleteImage(ctx context.Context, imageID, productID int) (string, error) {
 	var path string
 	err := r.pool.QueryRow(ctx, `
-		DELETE FROM product_images
+		DELETE FROM product_images WHERE id = $1 AND product_id = $2 RETURNING file_path
-		WHERE id = $1 AND product_id = $2
-		RETURNING file_path
 	`, imageID, productID).Scan(&path)
 	if errors.Is(err, pgx.ErrNoRows) {
-		return "", fmt.Errorf("image not found")
+		return "", errors.New("image not found")
 	}
 	return path, err
 }
@@ -177,12 +197,17 @@ func (r *ProductRepository) collectProducts(rows pgx.Rows) ([]models.Product, er
 	var products []models.Product
 	for rows.Next() {
 		var p models.Product
+		var catID sql.NullInt64
 		if err := rows.Scan(
-			&p.ID, &p.Name, &p.Description, &p.Details, &p.Price,
+			&p.ID, &p.Name, &p.Description, &p.Details, &p.Price, &p.SalePrice,
-			&p.ImageURL, &p.Category, &p.IsActive, &p.CreatedAt, &p.UpdatedAt,
+			&p.ImageURL, &p.Category, &catID, &p.CategorySlug, &p.IsActive, &p.CreatedAt, &p.UpdatedAt,
 		); err != nil {
 			return nil, err
 		}
+		if catID.Valid {
+			id := int(catID.Int64)
+			p.CategoryID = &id
+		}
 		products = append(products, p)
 	}
 	return products, rows.Err()

migrations/005_categories_sale.sql

@@ -0,0 +1,24 @@
+-- Категории и цена со скидкой
+
+CREATE TABLE IF NOT EXISTS categories (
+    id          SERIAL PRIMARY KEY,
+    name        VARCHAR(100) NOT NULL UNIQUE,
+    slug        VARCHAR(100) NOT NULL UNIQUE,
+    description TEXT NOT NULL DEFAULT '',
+    sort_order  INT NOT NULL DEFAULT 0,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+ALTER TABLE products ADD COLUMN IF NOT EXISTS category_id INT REFERENCES categories(id) ON DELETE SET NULL;
+ALTER TABLE products ADD COLUMN IF NOT EXISTS sale_price NUMERIC(10, 2);
+
+INSERT INTO categories (name, slug, sort_order) VALUES
+    ('Электроника', 'elektronika', 1),
+    ('Одежда', 'odezhda', 2),
+    ('Дом и сад', 'dom-i-sad', 3),
+    ('Аксессуары', 'aksessuary', 4),
+    ('Разное', 'raznoe', 5)
+ON CONFLICT (slug) DO NOTHING;
+
+UPDATE products p SET category_id = c.id
+FROM categories c WHERE p.category = c.name AND p.category_id IS NULL;