/**
 * Per-member output volume lives in the browser, not on the server: the tile menu
 * writes it while the user drags the slider, and the deafen toggle reads the same
 * keys back when the sound comes on again. Both go through this module so the
 * storage format cannot drift between them.
 */
const VOLUME_PREFIX = 'gitdata.voice.volume.'

/** Remembered volume for one member; 1 when nothing usable is stored. */
export function rememberedVolume(roomId: string | null, identity: string): number {
  if (!roomId) return 1
  try {
    const raw = Number(localStorage.getItem(VOLUME_PREFIX + roomId + '.' + identity))
    return Number.isFinite(raw) && raw > 0 ? raw : 1
  } catch {
    return 1
  }
}

/** Persist one member's volume. Best effort: memory is a convenience. */
export function rememberVolume(roomId: string, identity: string, volume: number): void {
  try {
    localStorage.setItem(VOLUME_PREFIX + roomId + '.' + identity, String(volume))
  } catch {
    // Volume memory is a convenience, never a requirement.
  }
}