"""Logging configuration."""

import logging
import sys
from pathlib import Path
from logging.handlers import RotatingFileHandler


def setup_logger(
    name: str = "bot",
    log_level: int = logging.INFO,
    log_file: str = "logs/bot.log"
) -> logging.Logger:
    """
    Configure and return logger instance.
    
    Args:
        name: Logger name
        log_level: Logging level
        log_file: Path to log file
    
    Returns:
        Configured logger instance
    """
    logger = logging.getLogger(name)
    logger.setLevel(log_level)
    
    # Create formatters
    console_formatter = logging.Formatter(
        '%(asctime)s | %(levelname)-8s | %(name)s | %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S'
    )
    
    file_formatter = logging.Formatter(
        '%(asctime)s | %(levelname)-8s | %(name)s | %(funcName)s:%(lineno)d | %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S'
    )
    
    # Console handler
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setLevel(log_level)
    console_handler.setFormatter(console_formatter)
    
    # File handler
    if log_file:
        Path(log_file).parent.mkdir(parents=True, exist_ok=True)
        file_handler = RotatingFileHandler(
            log_file,
            maxBytes=10*1024*1024,  # 10MB
            backupCount=5,
            encoding='utf-8'
        )
        file_handler.setLevel(log_level)
        file_handler.setFormatter(file_formatter)
        logger.addHandler(file_handler)
    
    logger.addHandler(console_handler)
    
    return logger


logger = setup_logger()