"""Bottom status bar: battery level + current time, refreshed every second.
Battery is read via psutil (cross-platform); on a desktop machine with no
battery, psutil.sensors_battery() returns None and the bar just shows time.
"""

from __future__ import annotations

from datetime import datetime

from textual.widgets import Static

try:
    import psutil
except ImportError:
    psutil = None  # battery display degrades gracefully to time-only


class StatusBar(Static):
    def on_mount(self) -> None:
        self._refresh()
        self.set_interval(1.0, self._refresh)

    def _refresh(self) -> None:
        self.update(self._render_text())

    def _render_text(self) -> str:
        parts = []
        battery = self._battery_text()
        if battery:
            parts.append(battery)
        parts.append(datetime.now().strftime("%H:%M:%S"))
        return "  ".join(parts)

    def _battery_text(self) -> str | None:
        if psutil is None:
            return None
        try:
            battery = psutil.sensors_battery()
        except Exception:
            return None
        if battery is None:
            return None
        state = "lädt" if battery.power_plugged else "Akku"
        return f"{state} {round(battery.percent)}%"