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

load_dotenv()

LOG_ENABLED = os.getenv('LOG_ENABLED', 'true').lower() == 'true'
LOG_LEVEL = getattr(logging, os.getenv('LOG_LEVEL', 'DEBUG').upper(), logging.DEBUG)

os.makedirs('logs', exist_ok=True)

FORMATTER = logging.Formatter(
    '%(asctime)s | %(levelname)s | %(name)s | %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S'
)

def _file_handler(filename: str, level: int) -> RotatingFileHandler:
    handler = RotatingFileHandler(
        f'logs/{filename}',
        maxBytes=5 * 1024 * 1024,
        backupCount=3,
        encoding='utf-8'
    )
    handler.setLevel(level)
    handler.setFormatter(FORMATTER)
    return handler

def _console_handler() -> logging.StreamHandler:
    handler = logging.StreamHandler()
    handler.setLevel(logging.INFO)
    handler.setFormatter(FORMATTER)
    return handler

def get_logger(name: str) -> logging.Logger:
    logger = logging.getLogger(name)

    if logger.handlers:
        return logger

    if not LOG_ENABLED:
        logger.addHandler(logging.NullHandler())
        return logger

    logger.setLevel(LOG_LEVEL)
    logger.addHandler(_file_handler('app.log', LOG_LEVEL))
    logger.addHandler(_file_handler('error.log', logging.ERROR))
    logger.addHandler(_console_handler())

    return logger