/** Conversions between the room UI's shutter model and Home Assistant's `cover.*`
 * convention. Home Assistant's `current_position`/`position` are percent *open* (100 =
 * fully open, 0 = fully closed); the UI (following the design mockup) thinks in percent
 * *closed*. Kept pure and separate because that inversion is easy to get backwards. */

export interface ShutterPreset {
  label: string;
  /** Percent closed: 0 = fully open, 100 = fully closed. */
  closedPercent: number;
}

export const SHUTTER_PRESETS: ShutterPreset[] = [
  { label: "Offen", closedPercent: 0 },
  { label: "Halb zu", closedPercent: 50 },
  { label: "Fast zu", closedPercent: 85 },
  { label: "Ganz zu", closedPercent: 100 },
];

/** HA's `current_position` -> the UI's "how closed" percent. */
export function closedPercentFromPosition(position: number): number {
  return 100 - position;
}

/** The UI's "how closed" percent -> the `position` `cover.set_cover_position` expects. */
export function positionFromClosedPercent(closedPercent: number): number {
  return 100 - closedPercent;
}

export function closedLabelFor(closedPercent: number): string {
  if (closedPercent <= 1) return "Offen";
  if (closedPercent >= 99) return "Ganz zu";
  if (closedPercent >= 80) return "Fast zu";
  if (closedPercent >= 40) return "Halb zu";
  return `${Math.round(closedPercent)}% zu`;
}