"""
Shared logger for Yugensys Vision AI.
Writes to stdout (visible in HF Spaces / container logs) and to
logs/app.log so you can also inspect the file locally.
"""
import logging
import os
import sys
from pathlib import Path

_LOG_DIR = Path(__file__).parent.parent / "logs"
_LOG_DIR.mkdir(exist_ok=True)
_LOG_FILE = _LOG_DIR / "app.log"

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

    if logger.handlers:          # already configured — return as-is
        return logger

    logger.setLevel(logging.DEBUG)

    fmt = logging.Formatter(
        fmt="%(asctime)s  %(levelname)-8s  %(name)s  —  %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    # stdout handler — shows up in HF Spaces "Logs" tab
    sh = logging.StreamHandler(sys.stdout)
    sh.setLevel(logging.DEBUG)
    sh.setFormatter(fmt)
    logger.addHandler(sh)

    # file handler — local inspection
    fh = logging.FileHandler(_LOG_FILE, encoding="utf-8")
    fh.setLevel(logging.DEBUG)
    fh.setFormatter(fmt)
    logger.addHandler(fh)

    return logger