"""Logging setup shared by every entrypoint.

Console handler is UTF-8 (so Kashmiri samples print on Windows cp1252 shells)
and a per-run file handler mirrors everything to <run_dir>/train.log.
"""
from __future__ import annotations

import logging
import os
import sys

_CONFIGURED = False


def get_logger(name: str = "ksbyte", run_dir: str | None = None,
               level: int = logging.INFO) -> logging.Logger:
    global _CONFIGURED
    logger = logging.getLogger(name)
    logger.setLevel(level)
    if not _CONFIGURED:
        fmt = logging.Formatter(
            "%(asctime)s | %(levelname)-7s | %(message)s", datefmt="%H:%M:%S"
        )
        # Console: force UTF-8 so Arabic-script samples never crash the stream.
        stream = sys.stdout
        try:
            stream.reconfigure(encoding="utf-8")  # py3.7+
        except Exception:
            pass
        ch = logging.StreamHandler(stream)
        ch.setFormatter(fmt)
        logger.addHandler(ch)

        if run_dir:
            os.makedirs(run_dir, exist_ok=True)
            fh = logging.FileHandler(os.path.join(run_dir, "train.log"), encoding="utf-8")
            fh.setFormatter(fmt)
            logger.addHandler(fh)
        _CONFIGURED = True
    return logger