"""Kleine Hilfsfunktionen ohne Fachlogik."""

from __future__ import annotations

import re
import time
from pathlib import Path
from typing import Any

import yaml

_DURATION = re.compile(r"^\s*(\d+(?:\.\d+)?)\s*([smhd]?)\s*$")
_FACTORS = {"": 1, "s": 1, "m": 60, "h": 3600, "d": 86400}
_PLACEHOLDER = re.compile(r"\{([a-zA-Z0-9_]+)\}")


def now() -> float:
    return time.time()


def load_yaml(path: str | Path) -> Any:
    with open(path, encoding="utf-8") as fh:
        return yaml.safe_load(fh) or {}


def parse_duration(value: str | int | float | None) -> float:
    """'5m' -> 300.0; Zahlen gelten als Sekunden."""
    if value is None:
        return 0.0
    if isinstance(value, int | float):
        return float(value)
    match = _DURATION.match(value)
    if not match:
        raise ValueError(f"Ungültige Dauer: {value!r}")
    return float(match.group(1)) * _FACTORS[match.group(2)]


class MissingLabel(KeyError):
    pass


def fill_template(value: Any, labels: dict[str, str]) -> Any:
    """Ersetzt {label} rekursiv; fehlende Labels lösen MissingLabel aus."""
    if isinstance(value, str):
        def repl(m: re.Match[str]) -> str:
            key = m.group(1)
            if key not in labels:
                raise MissingLabel(key)
            return str(labels[key])

        return _PLACEHOLDER.sub(repl, value)
    if isinstance(value, dict):
        return {k: fill_template(v, labels) for k, v in value.items()}
    if isinstance(value, list):
        return [fill_template(v, labels) for v in value]
    return value