import logging
from functools import wraps
import sys

# Configure logging: writes to file and optionally to console
def setup_logger(log_file="agent.log", console: bool = True, level=logging.INFO):
    logger = logging.getLogger("agent_logger")
    logger.setLevel(level)

    # File handler
    file_handler = logging.FileHandler(log_file)
    file_handler.setLevel(level)
    file_formatter = logging.Formatter("%(asctime)s | %(levelname)s | %(message)s")
    file_handler.setFormatter(file_formatter)
    logger.addHandler(file_handler)

    if console:
        # Console handler
        console_handler = logging.StreamHandler(sys.stdout)
        console_handler.setLevel(level)
        console_formatter = logging.Formatter("%(asctime)s | %(levelname)s | %(message)s")
        console_handler.setFormatter(console_formatter)
        logger.addHandler(console_handler)

    return logger


# Initialize logger (call once in your app)
logger = setup_logger()

def log_event(event: str, level: int = logging.INFO):
    """Log an event message at given level."""
    logger.log(level, event)


def log_function_call(func):
    """Decorator to log entry, exit and exceptions of a function."""

    @wraps(func)
    def wrapper(*args, **kwargs):
        logger.info(f"Started: {func.__name__}")
        try:
            result = func(*args, **kwargs)
            logger.info(f"Finished: {func.__name__}")
            return result
        except Exception as e:
            logger.error(f"Exception in {func.__name__}: {e}", exc_info=True)
            raise

    return wrapper