/** Availability of saved servers; one monitor in the Rust Core, the state is shared by the whole UI. */
import { call, subscribe } from "../transport";

export type AvailabilityStatus = "checking" | "online" | "offline" | "unknown" | "unverified";
export interface ServerAvailability {
  id: string;
  status: AvailabilityStatus;
  latencyMs: number | null;
  lastSuccessAt: number | null;
  lastAttemptAt: number | null;
  failures: number;
  reason: string | null;
  via: "direct" | "jump";
}
export interface AvailabilityChange { servers: ServerAvailability[]; removed?: string[]; reset?: boolean }

export const availability = Object.freeze({
  list: () => call<ServerAvailability[]>("core_availability_list", "availability:list"),
  refresh: () => call<{ refreshing: boolean }>("core_availability_refresh", "availability:refresh"),
  onChanged: (callback: (event: AvailabilityChange) => void) => subscribe("availability:changed", callback)
});