/**
 * [Gitea #327] Room state Synapse does NOT copy into the replacement room on
 * `POST /rooms/{id}/upgrade` (it carries only power levels, join rules,
 * name/topic/avatar, history visibility, guest access, encryption, server ACL
 * and space parent/child). Lotus keeps call policy, voice limits, soundboard,
 * message retention, role tags and room emoji packs in state, so an upgrade
 * silently dropped all of them.
 */
const CARRIED_TYPES = new Set([
  'm.room.retention',
  'in.cinny.room.power_level_tags',
  'im.ponies.room_emotes',
]);
const CARRIED_PREFIXES = ['io.lotus.'];

export type StateToCarry = { type: string; stateKey: string; content: Record<string, unknown> };

export const isCarriedStateType = (type: string): boolean =>
  CARRIED_TYPES.has(type) || CARRIED_PREFIXES.some((p) => type.startsWith(p));

/** The state events to re-create in the replacement room (non-empty content only). */
export const stateToCarry = (
  events: Array<{
    getType: () => string;
    getStateKey: () => string | undefined;
    getContent: () => Record<string, unknown>;
  }>,
): StateToCarry[] =>
  events
    .filter((ev) => isCarriedStateType(ev.getType()))
    .map((ev) => ({
      type: ev.getType(),
      stateKey: ev.getStateKey() ?? '',
      content: ev.getContent(),
    }))
    .filter((s) => s.content && Object.keys(s.content).length > 0);