"""
数据库配置管理模块
统一管理数据库连接和SQL操作
"""
import pymysql
import logging

logger = logging.getLogger(__name__)

# 数据库配置
DB_CONFIG = {
    'host': '8.149.233.36',
    'user': 'ai_article_read',
    'password': '7aK_H2yvokVumr84lLNDt8fDBp6P',
    'database': 'ai_article',
    'charset': 'utf8mb4'
}


class DatabaseManager:
    """数据库管理器：统一管理数据库连接和操作"""
    
    def __init__(self, config=None):
        """初始化数据库管理器
        
        Args:
            config: 数据库配置字典，默认使用 DB_CONFIG
        """
        self.config = config or DB_CONFIG
    
    def get_connection(self, autocommit=False):
        """获取数据库连接
        
        Args:
            autocommit: 是否启用自动提交模式
            
        Returns:
            pymysql连接对象
        """
        return pymysql.connect(**self.config, autocommit=autocommit)
    
    def execute_query(self, sql, params=None, fetch_one=False):
        """执行查询SQL（SELECT）
        
        Args:
            sql: SQL语句
            params: SQL参数（tuple或list）
            fetch_one: True返回单条记录，False返回所有记录
            
        Returns:
            查询结果
        """
        conn = None
        cursor = None
        try:
            conn = self.get_connection()
            cursor = conn.cursor()
            
            logger.info(f'[SQL] {sql.strip()} | params: {params}')
            cursor.execute(sql, params or ())
            
            if fetch_one:
                result = cursor.fetchone()
            else:
                result = cursor.fetchall()
            
            logger.debug(f'[SQL结果] 返回 {len(result) if not fetch_one and result else (1 if result else 0)} 条记录')
            return result
        except Exception as e:
            logger.error(f'执行查询失败：{e}', exc_info=True)
            raise
        finally:
            if cursor:
                cursor.close()
            if conn:
                conn.close()
    
    def execute_update(self, sql, params=None, autocommit=True):
        """执行更新SQL（INSERT/UPDATE/DELETE）
        
        Args:
            sql: SQL语句
            params: SQL参数（tuple或list）
            autocommit: 是否自动提交
            
        Returns:
            影响的行数
        """
        conn = None
        cursor = None
        try:
            conn = self.get_connection(autocommit=autocommit)
            cursor = conn.cursor()
            
            logger.info(f'[SQL] {sql.strip()} | params: {params}')
            result = cursor.execute(sql, params or ())
            
            if not autocommit:
                conn.commit()
            
            logger.info(f'[SQL执行] 影响 {result} 行')
            return result
        except Exception as e:
            if not autocommit and conn:
                conn.rollback()
            logger.error(f'执行更新失败：{e}', exc_info=True)
            raise
        finally:
            if cursor:
                cursor.close()
            if conn:
                conn.close()
    
    def execute_many(self, sql, params_list, autocommit=True):
        """批量执行SQL
        
        Args:
            sql: SQL语句
            params_list: 参数列表，每个元素是一组参数
            autocommit: 是否自动提交
            
        Returns:
            成功执行的行数
        """
        conn = None
        cursor = None
        try:
            conn = self.get_connection(autocommit=autocommit)
            cursor = conn.cursor()
            
            logger.info(f'[SQL批量] {sql.strip()} | 批次数: {len(params_list)}')
            
            success_count = 0
            for params in params_list:
                try:
                    result = cursor.execute(sql, params)
                    if result > 0:
                        success_count += 1
                except Exception as e:
                    logger.debug(f'批量执行跳过：params={params}，错误：{e}')
            
            if not autocommit:
                conn.commit()
            
            logger.info(f'[SQL批量执行] 成功 {success_count}/{len(params_list)} 条')
            return success_count
        except Exception as e:
            if not autocommit and conn:
                conn.rollback()
            logger.error(f'批量执行失败：{e}', exc_info=True)
            raise
        finally:
            if cursor:
                cursor.close()
            if conn:
                conn.close()


# 创建全局数据库管理器实例
db_manager = DatabaseManager()