export interface ChatMessage {
  id: string;
  userId: string;
  text: string;
  createdAt: string;
  clientId: string;
  /** True while the message is only local (not yet echoed by server). */
  optimistic?: boolean;
}

/** Raw shape returned by the REST API (snake_case from Postgres). */
export interface RawApiMessage {
  id: string;
  user_id: string;
  text: string;
  created_at: string;
  client_id?: string;
}

export type ServerMessage =
  | { type: "message.new"; id: string; userId: string; text: string; createdAt: string; clientId: string }
  | { type: "typing"; userId: string; isTyping: boolean }
  | { type: "presence.update"; userId: string; status: "online" | "offline" }
  | { type: "error"; code: string; message: string };

export interface UnreadCount {
  channel_id: string;
  unread_count: number;
}

export function normalizeMessage(raw: RawApiMessage): ChatMessage {
  return {
    id: raw.id,
    userId: raw.user_id,
    text: raw.text,
    createdAt: raw.created_at,
    clientId: raw.client_id ?? "",
  };
}