/**
 * [Gitea #283] Do Not Disturb as a real presence state: MSC3026 "busy"
 * (Synapse `experimental_features.msc3026_enabled`). Before, DND was sent as
 * presence `unavailable` with the literal status text "dnd", which replaced
 * your status and showed as "dnd" in other clients.
 */
export const BUSY_PRESENCE = 'org.matrix.msc3026.busy';
export const BUSY_PRESENCE_FEATURE = 'org.matrix.msc3026.busy_presence';

let busySupported = false;

/** Recorded by the presence updater from the server's unstable_features. */
export const setBusyPresenceSupported = (supported: boolean): void => {
  busySupported = supported;
};

export const isBusyPresenceSupported = (): boolean => busySupported;

/** Pure: whether a presence means Do Not Disturb (busy, or the legacy "dnd" text). */
export const isDndPresence = (presence: string | undefined, status: string | undefined): boolean =>
  presence === BUSY_PRESENCE || (presence === 'unavailable' && status === 'dnd');