from database import  MySqlDatabaseHelper
from sqlalchemy import text
import pandas as pd

class MySqlDao:
    _instance = None
    
    def __new__(cls):
        if not cls._instance:
            cls._instance = super(MySqlDao, cls).__new__(cls)
            cls._instance._initialized = False
        return cls._instance
    
    def __init__(self):
        if self._initialized:
            return
        
        self.db_helper = MySqlDatabaseHelper()
        
        self._cust_table_name = "tads_brandcul_retail_cust_label"              # 商户信息表
        self._analysis_table_name = "tads_brandcul_analysis_index"             # 指标分析表
        
        self.cust_table_dao = self.CustTableDao(self.db_helper, self._cust_table_name)
        
        self._initialized = True
        
    class CustTableDao:
        """商户数据操作类"""
        def __init__(self, db_helper: MySqlDatabaseHelper, tablename):
            self.db_helper = db_helper
            self.tablename = tablename
            
        def load_data(self, features, corp_uuid):
            """读取商户数据"""
            features_column = ",".join(features)
            
            query = f"SELECT {features_column} FROM {self.tablename} WHERE corp_uuid = :corp_uuid"
            params = {"corp_uuid": corp_uuid}
            
            data = self.db_helper.load_data_with_page(query, params)
            
            return data
        
        def get_column_unique_value(self, column, corp_uuid):
            """获取指定列的唯一值列表"""
            query = f"SELECT {column} FROM {self.tablename} WHERE corp_uuid = :corp_uuid"
            params = {"corp_uuid", corp_uuid}
            
            data = self.db_helper.load_data_with_page(query, params)
            
            return data
            
            
            
        
        
if __name__ == '__main__':
    features = ["cust_code", "cust_name", "busi_place_area_section"]
    
    dao = MySqlDao()
    corp_uuid = "00000000000000000000000011440101"
    
    data = dao.cust_table_dao.get_column_unique_value("busi_place_area_section", corp_uuid)
    print(data)