-- Order items table
CREATE TABLE order_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    order_id UUID NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
    product_id UUID NOT NULL REFERENCES products(id) ON DELETE RESTRICT,
    product_variant_id UUID REFERENCES product_variants(id) ON DELETE SET NULL,
    quantity INTEGER NOT NULL CHECK (quantity > 0),
    unit_price DECIMAL(10,2) NOT NULL CHECK (unit_price >= 0),
    total_price DECIMAL(10,2) NOT NULL CHECK (total_price >= 0),
    modifiers JSONB DEFAULT '[]',
    status VARCHAR(50) DEFAULT 'pending' CHECK (status IN ('pending', 'preparing', 'ready', 'served', 'cancelled')),
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Indexes
CREATE INDEX idx_order_items_order_id ON order_items(order_id);
CREATE INDEX idx_order_items_product_id ON order_items(product_id);
CREATE INDEX idx_order_items_product_variant_id ON order_items(product_variant_id);
CREATE INDEX idx_order_items_status ON order_items(status);
CREATE INDEX idx_order_items_created_at ON order_items(created_at);