class ProductService:
    def list_categories(self) -> dict:
        return {
            "total": 2,
            "page_no": 1,
            "page_size": 20,
            "list": [
                {"category_id": 1, "category_name": "工业品", "category_code": "industry", "status": 1},
                {"category_id": 2, "category_name": "日用品", "category_code": "daily", "status": 1},
            ],
        }

    def create_category(self) -> dict:
        return {
            "category_id": 3,
            "category_name": "新分类",
            "category_code": "new-category",
            "status": 1,
        }

    def update_category(self, category_id: int) -> dict:
        return {"category_id": category_id, "updated": True}

    def list_products(self) -> dict:
        return {
            "total": 1,
            "page_no": 1,
            "page_size": 20,
            "list": [
                {
                    "product_id": 2001,
                    "product_name": "产品A",
                    "specification": "10kg",
                    "unit": "袋",
                    "category_id": 1,
                    "category_name": "工业品",
                    "cost_price": 60,
                    "sale_price": 100,
                    "status": 1,
                }
            ],
        }

    def create_product(self) -> dict:
        return {
            "product_id": 2002,
            "product_name": "产品B",
            "specification": "20kg",
            "unit": "袋",
            "status": 1,
        }

    def get_product(self, product_id: int) -> dict:
        return {
            "product_id": product_id,
            "product_name": "产品A",
            "specification": "10kg",
            "unit": "袋",
            "category_id": 1,
            "category_name": "工业品",
            "cost_price": 60,
            "sale_price": 100,
            "status": 1,
        }


product_service = ProductService()