"""Logging: jurnal de acces lizibil, fara zgomotul polling-ului.

Flask/werkzeug scrie un rand pentru fiecare cerere. Pagina de cantarire
interogheaza greutatea de mai multe ori pe secunda, deci jurnalul devine
inutilizabil. Aici:
  - cererile de polling (/api/weight) si fisierele statice nu sunt logate;
  - erorile (4xx/5xx) sunt pastrate intotdeauna;
  - jurnalul aplicatiei merge la stderr, cu timestamp.
"""
from __future__ import annotations

import logging
import re
import sys

QUIET_PREFIXES = (
    "GET /api/weight",
    "GET /static/",
    "GET /favicon.ico",
)

# Werkzeug access line: ... "GET /path HTTP/1.1" 200 -
_STATUS_RE = re.compile(r'"\s(\d{3})\s')


class _QuietPolling(logging.Filter):
    """Drop access-log records for polling and static assets, keep errors."""

    def filter(self, record: logging.LogRecord) -> bool:
        try:
            message = record.getMessage()
        except Exception:  # noqa: BLE001 - never let logging break a request
            return True
        if not any(prefix in message for prefix in QUIET_PREFIXES):
            return True
        match = _STATUS_RE.search(message)
        if match is None:
            return True
        # Keep only failures (4xx / 5xx); 2xx and 304 are noise.
        return not match.group(1).startswith(("2", "3"))


def configure_logging(level: int = logging.INFO) -> None:
    handler = logging.StreamHandler(sys.stderr)
    handler.setFormatter(logging.Formatter("%(asctime)s %(levelname)-7s %(name)s: %(message)s",
                                          "%H:%M:%S"))
    root = logging.getLogger()
    if not root.handlers:
        root.addHandler(handler)
    root.setLevel(level)

    werkzeug = logging.getLogger("werkzeug")
    werkzeug.setLevel(logging.INFO)
    if not any(isinstance(f, _QuietPolling) for f in werkzeug.filters):
        werkzeug.addFilter(_QuietPolling())

    logging.getLogger("scale_bridge").setLevel(logging.WARNING)