"""
CRM MySQL Service - Подключение к MySQL БД vtiger CRM
"""
import aiomysql
from typing import Optional, Dict, Any, List
from ..config import settings
import logging

logger = logging.getLogger(__name__)


class CrmMySQLService:
    """Сервис для работы с MySQL БД vtiger CRM"""
    
    def __init__(self):
        self.pool: Optional[aiomysql.Pool] = None
    
    async def connect(self):
        """Подключение к MySQL БД vtiger CRM"""
        try:
            self.pool = await aiomysql.create_pool(
                host=settings.mysql_crm_host,
                port=settings.mysql_crm_port,
                user=settings.mysql_crm_user,
                password=settings.mysql_crm_password,
                db=settings.mysql_crm_db,
                autocommit=True,
                minsize=1,
                maxsize=5
            )
            logger.info(f"✅ MySQL CRM DB connected: {settings.mysql_crm_host}:{settings.mysql_crm_port}/{settings.mysql_crm_db}")
        except Exception as e:
            logger.error(f"❌ MySQL CRM DB connection error: {e}")
            raise
    
    async def fetch_one(self, query: str, *args) -> Optional[Dict[str, Any]]:
        """
        Выполнить SQL запрос и вернуть одну запись
        
        Args:
            query: SQL запрос с плейсхолдерами %s
            *args: Параметры для запроса
        
        Returns:
            Dict с данными или None если не найдено
        """
        if not self.pool:
            await self.connect()
        
        try:
            async with self.pool.acquire() as conn:
                async with conn.cursor(aiomysql.DictCursor) as cursor:
                    await cursor.execute(query, args)
                    result = await cursor.fetchone()
                    return dict(result) if result else None
        except Exception as e:
            logger.error(f"❌ Error executing query: {e}")
            raise
    
    async def fetch_all(self, query: str, *args) -> List[Dict[str, Any]]:
        """
        Выполнить SQL запрос и вернуть все записи
        
        Args:
            query: SQL запрос с плейсхолдерами %s
            *args: Параметры для запроса
        
        Returns:
            List[Dict] с данными
        """
        if not self.pool:
            await self.connect()
        
        try:
            async with self.pool.acquire() as conn:
                async with conn.cursor(aiomysql.DictCursor) as cursor:
                    await cursor.execute(query, args)
                    results = await cursor.fetchall()
                    return [dict(row) for row in results] if results else []
        except Exception as e:
            logger.error(f"❌ Error executing query: {e}")
            raise
    
    async def execute(self, query: str, *args) -> int:
        """
        Выполнить SQL запрос (INSERT, UPDATE, DELETE)
        
        Args:
            query: SQL запрос с плейсхолдерами %s
            *args: Параметры для запроса
        
        Returns:
            Количество затронутых строк
        """
        if not self.pool:
            await self.connect()
        
        try:
            async with self.pool.acquire() as conn:
                async with conn.cursor() as cursor:
                    await cursor.execute(query, args)
                    return cursor.rowcount
        except Exception as e:
            logger.error(f"❌ Error executing query: {e}")
            raise
    
    async def close(self):
        """Закрыть пул подключений"""
        if self.pool:
            self.pool.close()
            await self.pool.wait_closed()
            logger.info("MySQL CRM DB pool closed")


# Глобальный экземпляр
crm_mysql_service = CrmMySQLService()