import logging
import os
from logging.handlers import RotatingFileHandler
from dotenv import load_dotenv
load_dotenv()

# Configuration values
LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO").upper()
LOG_FORMAT = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
LOG_DIR = os.getenv("LOG_DIR", os.path.join(os.getcwd(), "logs"))

# Ensure log directory exists
os.makedirs(LOG_DIR, exist_ok=True)

# Log file path
LOG_FILE = os.path.join(LOG_DIR, "app.log")

# Create root logger
logger = logging.getLogger("gpt-agent")
logger.setLevel(LOG_LEVEL)

# Formatter
formatter = logging.Formatter(LOG_FORMAT)

# Console handler
console_handler = logging.StreamHandler()
console_handler.setLevel(LOG_LEVEL)
console_handler.setFormatter(formatter)
logger.addHandler(console_handler)

# Rotating file handler
file_handler = RotatingFileHandler(LOG_FILE, maxBytes=5*1024*1024, backupCount=5)
file_handler.setLevel(LOG_LEVEL)
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)

def get_logger(name: str | None = None) -> logging.Logger:
    """
    Retrieve a configured logger instance. If name is provided,
    returns a child logger of the configured root logger.
    """
    if name:
        return logger.getChild(name)
    return logger