#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2023/4/8 9:05
# @Author  : old tom
# @File    : metadata_reader.py
# @Project : futool-tiny-datahub
# @Desc    : 元数据读取

import abc
import os
from configparser import ConfigParser
from datahub.log_conf import Logger
from datahub.datasource.datasource_manage import DataSource
from datahub.metadata.metadatadao.metadata_dao import MetadataDao

BASE_DIR = os.path.dirname(os.path.abspath(__file__))

reader_conf = ConfigParser()
reader_conf.read(os.path.join(BASE_DIR, 'reader_conf.ini'))

logger = Logger().get_logger()


class AbsMetadataReader(metaclass=abc.ABCMeta):
    """
    抽象元数据读取器
    """

    def __init__(self, datasource):
        self.datasource = datasource

    @abc.abstractmethod
    def query_tables(self):
        """
        查询当前连接下所有表
        :return:
        """
        pass

    @abc.abstractmethod
    def query_views(self):
        """
        查询当前连接下所有视图
        :return:
        """
        pass

    @abc.abstractmethod
    def query_procedure(self):
        """
        查询当前连接下所有存储过程
        :return:
        """
        pass

    @abc.abstractmethod
    def query_table_fields(self, table):
        """
        查询字段
        :param table:
        :return:
        """
        pass


class MetadataReader(AbsMetadataReader):
    def __init__(self, datasource: DataSource):
        super().__init__(datasource)
        self.db_type = datasource.connector.db_type
        self.dao = MetadataDao(datasource.connector)

    def query_tables(self):
        return self.dao.query_all_tables(reader_conf[self.db_type]['tables'])

    def query_views(self):
        return self.dao.query_all_views(reader_conf[self.db_type]['views'])

    def query_procedure(self):
        return self.dao.query_all_procedure(reader_conf[self.db_type]['procedure'])

    def query_table_fields(self, table):
        return self.dao.query_table_field(reader_conf[self.db_type]['table_field'].replace('#$#', table))

    def query_metadata_detail(self, obj_name, obj_type):
        """
        查询元数据明细
        例：obj_type 为view或procedure 则查询对应创建语句
        为table 则查询中文注释
        :param obj_name: 对象名称
        :param obj_type: 对象类型
        :return:
        """
        return {
            'table': self.dao.query_table_field(
                reader_conf[self.db_type][obj_type + '_detail'].replace('#$#', obj_name)),
            'view': self.dao.query_view_detail(obj_name,
                                               reader_conf[self.db_type][obj_type + '_detail'].replace('#$#',
                                                                                                       obj_name)),
            'procedure': self.dao.query_procedure_detail(
                reader_conf[self.db_type][obj_type + '_detail'].replace('#$#', obj_name))
        }[obj_type]