-- 002_add_cart_orders.sql
-- Таблицы для корзины и заказов

-- Таблица корзины
CREATE TABLE IF NOT EXISTS cart (
    cart_id SERIAL PRIMARY KEY,
    user_id INTEGER REFERENCES users(user_id) ON DELETE CASCADE,
    product_id INTEGER REFERENCES products(product_id) ON DELETE CASCADE,
    quantity INTEGER DEFAULT 1 CHECK (quantity > 0),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, product_id)
);

-- Таблица заказов
CREATE TABLE IF NOT EXISTS orders (
    order_id SERIAL PRIMARY KEY,
    order_number VARCHAR(50) UNIQUE NOT NULL,
    user_id INTEGER REFERENCES users(user_id) ON DELETE SET NULL,
    
    -- Контактная информация
    customer_name VARCHAR(100) NOT NULL,
    customer_email VARCHAR(255) NOT NULL,
    customer_phone VARCHAR(20) NOT NULL,
    
    -- Адрес доставки
    delivery_address TEXT NOT NULL,
    delivery_region VARCHAR(100),
    postal_code VARCHAR(20),
    
    -- Способы
    delivery_method VARCHAR(50) DEFAULT 'courier',
    payment_method VARCHAR(50) DEFAULT 'card',
    
    -- Суммы
    subtotal DECIMAL(10, 2) NOT NULL,
    discount_amount DECIMAL(10, 2) DEFAULT 0,
    delivery_price DECIMAL(10, 2) DEFAULT 0,
    final_amount DECIMAL(10, 2) NOT NULL,
    
    -- Промокод
    promo_code VARCHAR(50),
    
    -- Статус и даты
    status VARCHAR(30) DEFAULT 'pending',
    notes TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    completed_at TIMESTAMP
);

-- Таблица позиций заказа
CREATE TABLE IF NOT EXISTS order_items (
    item_id SERIAL PRIMARY KEY,
    order_id INTEGER REFERENCES orders(order_id) ON DELETE CASCADE,
    product_id INTEGER REFERENCES products(product_id) ON DELETE SET NULL,
    product_name VARCHAR(200) NOT NULL,
    product_price DECIMAL(10, 2) NOT NULL,
    quantity INTEGER NOT NULL CHECK (quantity > 0),
    total_price DECIMAL(10, 2) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Индексы
CREATE INDEX IF NOT EXISTS idx_cart_user ON cart(user_id);
CREATE INDEX IF NOT EXISTS idx_orders_user ON orders(user_id);
CREATE INDEX IF NOT EXISTS idx_orders_status ON orders(status);
CREATE INDEX IF NOT EXISTS idx_orders_created ON orders(created_at);
CREATE INDEX IF NOT EXISTS idx_order_items_order ON order_items(order_id);