import logging
import sys
from pathlib import Path


BASE_DIR = Path(__file__).parent.parent.parent
LOG_DIR = BASE_DIR / "logs"
LOG_DIR.mkdir(exist_ok=True)


def setup_logger(name: str, level: str = "INFO") -> logging.Logger:
    logger = logging.getLogger(name)
    logger.setLevel(getattr(logging, level.upper()))
    
    if logger.handlers:
        return logger
    
    formatter = logging.Formatter(
        fmt="%(asctime)s | %(levelname)-8s | %(name)s | %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S"
    )
    
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setFormatter(formatter)
    logger.addHandler(console_handler)
    
    file_handler = logging.FileHandler(LOG_DIR / "app.log")
    file_handler.setFormatter(formatter)
    logger.addHandler(file_handler)
    
    return logger


logger = setup_logger("rag_chatbot")