from db.pgsql import PostgreSQL
from db.system_config_dao import SystemConfigDAO
import logging

class LoginDAO:
    """用户登录数据访问对象"""
    
    def __init__(self):
        """初始化数据访问对象"""
        self.db = PostgreSQL()
        
    def __del__(self):
        """析构函数，确保数据库连接关闭"""
        if hasattr(self, 'db'):
            # 如果连接还打开着，确保关闭
            try:
                self.db.disconnect()
            except:
                pass
                
    def check_user_login(self, user_id: str, password: str) -> bool:
        """检查用户登录凭证
        
        Args:
            user_id: 用户ID
            password: 用户密码
            
        Returns:
            bool: 登录是否成功
        """
        try:
            self.db.connect()
            sql = "SELECT 1 FROM sys_user WHERE user_id=%s AND password=md5(%s)"
            result = self.db.execute_query(sql, (user_id, password))
            return bool(len(result) > 0)
        except Exception as e:
            logging.error(f"检查用户登录失败: {str(e)}")
            return False
        finally:
            self.db.disconnect()

    def get_user_info(self, user_id: str):
        """获取用户信息
        
        Args:
            user_id: 用户ID
            
        Returns:
            tuple: (用户名, 公司名, 公司ID, 职位ID) 或 (None, None, None, None)
        """
        try:
            self.db.connect()
            sql = """
                SELECT user_id, nick_name AS user_name, position_id, 
                       f_getname('GETCORPEXP', '', '', org_id) AS corp_name, 
                       org_id AS corp_id, default_org_id
                FROM sys_user
                WHERE user_id = %s
            """
            result = self.db.execute_query(sql, (user_id,))
            if result:
                user_name = result[0]['user_name']
                corp_name = result[0]['corp_name']
                corp_id = result[0]['corp_id']
                position_id = result[0]['position_id']
                default_org_id = result[0]['default_org_id']
                
                # 如果有默认账套ID，使用默认账套ID替代登录账套ID
                if default_org_id:
                    corp_id = default_org_id
                    # 查询默认账套的名称
                    corp_name_sql = """
                        SELECT corp_exp
                        FROM sys_org
                        WHERE org_id = %s
                    """
                    corp_result = self.db.execute_query(corp_name_sql, (corp_id,))
                    if corp_result:
                        corp_name = corp_result[0]['corp_exp']
                
                # 将用户的当前账套ID保存到内存中
                SystemConfigDAO.save_user_selected_corp(user_id, corp_id)
                
                return user_name, corp_name, corp_id, position_id
            return None, None, None, None
        except Exception as e:
            logging.error(f"获取用户信息失败: {str(e)}")
            return None, None, None, None
        finally:
            self.db.disconnect()

# 为保持向后兼容，添加全局函数
def check_user_login(user_id: str, password: str) -> bool:
    dao = LoginDAO()
    return dao.check_user_login(user_id, password)

def get_user_info(user_id: str):
    dao = LoginDAO()
    return dao.get_user_info(user_id)