import { useQuery } from '@tanstack/react-query';
import { useClient } from 'hooks/useClient';
import type { SlskdUserInfo, SlskdUserStatus } from './shared';

/** A peer's presence and profile, as far as either could be reached. */
export type SoulseekUser = {
  username: string;
  status: SlskdUserStatus | null;
  info: SlskdUserInfo | null;
};

/**
 * One peer's presence and profile, cached per username. Selecting a peer you've already looked at paints
 * from cache instead of blanking the panel back to its empty state and re-asking the network for an
 * answer it just had — which is what local state did, once per click.
 */
export function useSoulseekUser(username: string) {
  const { get } = useClient();

  return useQuery({
    queryKey: ['soulseek', 'user', username],
    queryFn: async (): Promise<SoulseekUser> => {
      const u = encodeURIComponent(username);
      const [status, info] = await Promise.allSettled([
        get<SlskdUserStatus>(`/soulseek/api/v0/users/${u}/status`),
        get<SlskdUserInfo>(`/soulseek/api/v0/users/${u}/info`),
      ]);
      // Half an answer is still worth showing — a reachable peer with a private profile answers only one
      // of the two. Both failing is what actually means "couldn't reach them".
      if (status.status === 'rejected' && info.status === 'rejected') {
        throw new Error(`Couldn't reach ${username} — they may be offline.`);
      }
      return {
        username,
        status: status.status === 'fulfilled' ? status.value : null,
        info: info.status === 'fulfilled' ? info.value : null,
      };
    },
    enabled: !!username,
    // Presence drifts, but not fast enough to be worth a round trip every time the panel remounts.
    staleTime: 60_000,
    // An unreachable peer IS the answer, not a fault to retry: retrying only delays saying so.
    retry: false,
  });
}