import pymysql
from typing import List, Dict, Any, Optional
from datetime import date
from common.log.module_logger import ModuleLogger
from common.config.app_settings import app_settings


class StarRocksClient:
    """StarRocks database client for querying user registration data"""
    
    def __init__(self):
        self.host = app_settings.STARROCKS_HOST
        self.port = app_settings.STARROCKS_PORT
        self.user = app_settings.STARROCKS_USER
        self.password = app_settings.STARROCKS_PASSWORD
        self.database = app_settings.STARROCKS_DATABASE
        self.connection = None
        self.module_logger = ModuleLogger(__file__)
    
    async def connect(self) -> bool:
        """Establish connection to StarRocks database"""
        try:
            self.connection = pymysql.connect(
                host=self.host,
                port=self.port,
                user=self.user,
                password=self.password,
                database=self.database,
                charset='utf8mb4',
                autocommit=True
            )
            await self.module_logger.log_info(f"Successfully connected to StarRocks at {self.host}:{self.port}")
            return True
        except Exception as e:
            await self.module_logger.log_error(f"Failed to connect to StarRocks: {e}")
            return False
    
    async def disconnect(self):
        """Close database connection"""
        if self.connection:
            self.connection.close()
            self.connection = None
            await self.module_logger.log_info("Disconnected from StarRocks")
    
    async def execute_query(self, query: str, params: Optional[tuple] = None) -> List[Dict[str, Any]]:
        """Execute SQL query and return results"""
        if not self.connection:
            if not await self.connect():
                raise Exception("Failed to connect to StarRocks database")
        
        try:
            with self.connection.cursor(pymysql.cursors.DictCursor) as cursor:
                cursor.execute(query, params)
                results = cursor.fetchall()
                await self.module_logger.log_info(f"Query executed successfully, returned {len(results)} rows")
                return results
        except Exception as e:
            await self.module_logger.log_error(f"Query execution failed: {e}")
            raise e