"""
Logging configuration for Garmin Health Sync system.

Provides structured logging with file and console handlers.
"""

import os
import logging
import sys
from pathlib import Path
from typing import Optional

from health.config import LOGS_DIR

DEFAULT_LOG_LEVEL = getattr(logging, os.getenv("LOG_LEVEL", "INFO").upper(), logging.INFO)

def setup_logger(
    name: str,
    log_file: Optional[str] = None,
    level: int = DEFAULT_LOG_LEVEL,
) -> logging.Logger:
    """Set up a logger with console and optional file handlers.

    Args:
        name: Logger name (usually __name__)
        log_file: Optional log file name (relative to LOGS_DIR)
        level: Logging level (default: INFO)

    Returns:
        Configured logger instance
    """
    logger = logging.getLogger(name)
    logger.setLevel(level)

    # Prevent propagation to parent loggers to avoid duplicate output
    logger.propagate = False

    # Avoid duplicate handlers
    if logger.handlers:
        return logger

    # Create formatter
    formatter = logging.Formatter(
        fmt="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    # Console handler
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setLevel(level)
    console_handler.setFormatter(formatter)
    logger.addHandler(console_handler)

    # File handler (if log_file specified)
    if log_file:
        log_path = LOGS_DIR / log_file
        file_handler = logging.FileHandler(log_path, encoding="utf-8")
        file_handler.setLevel(level)
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)

    return logger


# Default logger for the health module
default_logger = setup_logger("health", log_file="health_sync.log")