"""Logging setup.

Root logger writes to stdout (so tmux/systemd captures it) and to
``logs/relay-YYYY-MM-DD.log`` with daily rotation. Format includes
timestamp, level, logger name, and message.
"""

from __future__ import annotations

import logging
import sys
from logging.handlers import TimedRotatingFileHandler
from pathlib import Path


def configure(logs_dir: Path, level: int = logging.INFO) -> None:
    logs_dir.mkdir(parents=True, exist_ok=True)
    fmt = logging.Formatter(
        fmt="%(asctime)s %(levelname)-7s %(name)-22s %(message)s",
        datefmt="%Y-%m-%dT%H:%M:%S",
    )

    root = logging.getLogger()
    root.setLevel(level)

    # Remove pre-existing handlers (idempotent across reload during tests)
    for handler in list(root.handlers):
        root.removeHandler(handler)

    stdout = logging.StreamHandler(stream=sys.stdout)
    stdout.setFormatter(fmt)
    root.addHandler(stdout)

    file_handler = TimedRotatingFileHandler(
        filename=str(logs_dir / "relay.log"),
        when="midnight",
        backupCount=14,
        encoding="utf-8",
        utc=True,
    )
    file_handler.setFormatter(fmt)
    root.addHandler(file_handler)

    # Quiet libraries that are too chatty at INFO
    for noisy in ("urllib3", "httpx", "httpcore", "anthropic"):
        logging.getLogger(noisy).setLevel(logging.WARNING)