import { buildChatChannelMetaById, type ChatChannelMeta } from "./chat-meta-shared.js";
import { CHAT_CHANNEL_ORDER, type ChatChannelId } from "./ids.js";

let chatChannelMetaCache: Record<ChatChannelId, ChatChannelMeta> | null = null;

function getChatChannelMetaById(): Record<ChatChannelId, ChatChannelMeta> {
  chatChannelMetaCache ??= buildChatChannelMetaById();
  return chatChannelMetaCache;
}

export type { ChatChannelMeta };

export function listChatChannels(): ChatChannelMeta[] {
  const metaById = getChatChannelMetaById();
  return CHAT_CHANNEL_ORDER.map((id) => metaById[id]).filter((meta): meta is ChatChannelMeta =>
    Boolean(meta),
  );
}

export function getChatChannelMeta(id: ChatChannelId): ChatChannelMeta {
  return getChatChannelMetaById()[id];
}