import glob

import psutil

_temp_path: str | None = None
_temp_checked = False


def _read(path: str) -> str | None:
    try:
        with open(path) as f:
            return f.read().strip()
    except OSError:
        return None


def _find_temp_path() -> str | None:
    for hwmon in sorted(glob.glob("/sys/class/hwmon/hwmon*")):
        name = (_read(f"{hwmon}/name") or "").lower()
        if name in ("k10temp", "coretemp", "cpu_thermal"):
            for t in sorted(glob.glob(f"{hwmon}/temp*_input")):
                return t
            return None
    for zone in sorted(glob.glob("/sys/class/thermal/thermal_zone*")):
        if (_read(f"{zone}/type") or "").lower() == "acpitz":
            return f"{zone}/temp"
    return None


def temp() -> float | None:
    global _temp_path, _temp_checked
    if not _temp_checked:
        _temp_checked = True
        _temp_path = _find_temp_path()
    if _temp_path is None:
        return None
    v = _read(_temp_path)
    if not v:
        return None
    try:
        n = float(v)
    except ValueError:
        return None
    return round(n / 1000.0, 1)


def prime() -> None:
    _ = psutil.cpu_percent(None)


def core_count() -> int:
    return psutil.cpu_count(logical=True) or 1


def sample() -> dict[str, float]:
    out: dict[str, float] = {"cpu": psutil.cpu_percent(None)}
    t = temp()
    if t is not None:
        out["cpu_temp"] = t
    l1, l5, l15 = psutil.getloadavg()
    out["load1"] = l1
    out["load5"] = l5
    out["load15"] = l15
    return out