"""
MediGenius — core/logging_config.py
Rotating file + console logging setup.
"""

import logging
import os
import sys
from datetime import datetime
from logging.handlers import RotatingFileHandler

from app.core.config import LOG_DIR


def setup_logging(log_dir: str = LOG_DIR) -> logging.Logger:
    """Setup rotating file + console logging. Returns the 'medigenius' logger."""
    _logger = logging.getLogger("medigenius")

    # Avoid duplicate handlers on re-import
    if _logger.handlers:
        return _logger

    # Skip file logging if in test environment
    is_testing = "pytest" in sys.modules or os.getenv("TESTING") == "1"

    if is_testing:
        _logger.setLevel(logging.DEBUG)
    else:
        _logger.setLevel(logging.INFO)
        if not os.path.exists(log_dir):
            os.makedirs(log_dir)

        log_file = os.path.join(
            log_dir, f"medigenius_{datetime.now().strftime('%Y%m%d')}.log"
        )
        file_handler = RotatingFileHandler(log_file, maxBytes=10 * 1024 * 1024, backupCount=5)
        file_handler.setLevel(logging.INFO)
        file_handler.setFormatter(logging.Formatter(
            "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
            datefmt="%Y-%m-%d %H:%M:%S",
        ))
        _logger.addHandler(file_handler)

    console_handler = logging.StreamHandler()
    console_handler.setLevel(logging.INFO)

    formatter = logging.Formatter(
        "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )
    console_handler.setFormatter(formatter)
    _logger.addHandler(console_handler)

    return _logger


# Module-level singleton
logger = setup_logging()