"""第5-3课标准示例：根据业务结果生成HTTP响应。"""

from http import HTTPStatus


BOOKS = {1: "Python入门", 2: "数据库实践"}


def find_book(book_id: int) -> dict:
    """查询图书，并用状态码明确表达查询结果。"""

    title = BOOKS.get(book_id)
    if title is None:
        return {
            "status": HTTPStatus.NOT_FOUND,
            "headers": {"Content-Type": "application/json; charset=utf-8"},
            "body": {"message": "图书不存在"},
        }
    return {
        "status": HTTPStatus.OK,
        "headers": {"Content-Type": "application/json; charset=utf-8"},
        "body": {"id": book_id, "title": title},
    }


def print_response(response: dict) -> None:
    """输出响应状态行、响应头和响应体。"""

    status = response["status"]
    print(f"HTTP/1.1 {status.value} {status.phrase}")
    print(f"Content-Type: {response['headers']['Content-Type']}")
    print(f"响应体：{response['body']}")


def main() -> None:
    """分别展示查询成功与资源不存在的响应。"""

    print_response(find_book(1))
    print("---")
    print_response(find_book(99))


if __name__ == "__main__":
    main()