from .base import BaseMySQLClient


class Contents(BaseMySQLClient):
    async def insert_content(self, doc_id, text, text_type, title, dataset_id):
        query = """
            INSERT IGNORE INTO contents
                (doc_id, text, text_type, title, dataset_id)
            VALUES (%s, %s, %s, %s, %s);
        """
        return await self.pool.async_save(
            query=query, params=(doc_id, text, text_type, title, dataset_id)
        )

    async def update_content_info(self, doc_id, text, text_type, title, dataset_id):
        query = """
            UPDATE contents 
            SET text = %s, text_type = %s, title = %s, dataset_id = %s, status = %s
            WHERE doc_id = %s;
        """
        return await self.pool.async_save(
            query=query,
            params=(text, text_type, title, dataset_id, self.INIT_STATUS, doc_id),
        )

    async def update_content_status(self, doc_id, ori_status, new_status):
        query = """
            UPDATE contents
            SET status = %s
            WHERE doc_id = %s AND status = %s;
        """
        return await self.pool.async_save(
            query=query, params=(new_status, doc_id, ori_status)
        )

    async def update_dataset_status(self, dataset_id, ori_status, new_status):
        query = """
            UPDATE contents
            SET status = %s
            WHERE dataset_id = %s AND status = %s;
        """
        return await self.pool.async_save(
            query=query, params=(new_status, dataset_id, ori_status)
        )

    async def update_doc_status(self, doc_id, ori_status, new_status):
        """
        this function is to change the using status of each document
        :param doc_id:
        :param ori_status:
        :param new_status:
        :return:
        """
        query = """
            UPDATE contents SET doc_status = %s WHERE doc_id = %s AND doc_status = %s;
        """
        return await self.pool.async_save(
            query=query, params=(new_status, doc_id, ori_status)
        )

    async def select_count(self, dataset_id, doc_status=1):
        query = """
            SELECT count(*) AS count FROM contents WHERE dataset_id = %s AND doc_status = %s;
        """
        rows = await self.pool.async_fetch(query=query, params=(dataset_id, doc_status))
        return rows[0]["count"] if rows else 0

    async def select_content_by_doc_id(self, doc_id):
        query = """SELECT * FROM contents WHERE doc_id = %s;"""
        return await self.pool.async_fetch(query=query, params=(doc_id,))

    async def select_contents(
        self,
        page_num: int,
        page_size: int,
        order_by=None,
        dataset_id: int = None,
        doc_status: int = 1,
    ):
        """
        分页查询 contents 表，并返回分页信息
        :param page_num: 页码，从 1 开始
        :param page_size: 每页数量
        :param order_by: 排序条件，例如 {"id": "desc"} 或 {"created_at": "asc"}
        :param dataset_id: 数据集 ID
        :param doc_status: 文档状态（默认 1）
        :return: dict，包含 entities、total_count、page、page_size、total_pages
        """
        if order_by is None:
            order_by = {"id": "desc"}
        offset = (page_num - 1) * page_size

        # 动态拼接 where 条件
        where_clauses = ["doc_status = %s"]
        params = [doc_status]

        if dataset_id:
            where_clauses.append("dataset_id = %s")
            params.append(dataset_id)

        where_sql = " AND ".join(where_clauses)

        # 动态拼接 order by
        order_field, order_direction = list(order_by.items())[0]
        order_sql = f"ORDER BY {order_field} {order_direction.upper()}"

        # 查询总数
        count_query = f"SELECT COUNT(*) as total_count FROM contents WHERE {where_sql};"
        count_result = await self.pool.async_fetch(
            query=count_query, params=tuple(params)
        )
        total_count = count_result[0]["total_count"] if count_result else 0

        # 查询分页数据
        query = f"""
            SELECT * FROM contents
            WHERE {where_sql}
            {order_sql}
            LIMIT %s OFFSET %s;
        """
        params.extend([page_size, offset])
        entities = await self.pool.async_fetch(query=query, params=tuple(params))

        total_pages = (total_count + page_size - 1) // page_size  # 向上取整

        return {
            "entities": entities,
            "total_count": total_count,
            "page": page_num,
            "page_size": page_size,
            "total_pages": total_pages,
        }