import type { Entitlements, Plan } from './plans';
import type { NotificationPrefs } from './notifications';
import type { NowPlayingProvider, StreamingService } from './services';

export interface TrackDTO {
  id: string;
  title: string;
  artist: string;
  album: string | null;
  artworkUrl: string | null;
  durationMs: number | null;
  isrc: string | null;
  links: Partial<Record<StreamingService, string>>;
}

export interface UserSummaryDTO {
  id: string;
  username: string;
  displayName: string | null;
  avatarUrl: string | null;
}

export interface MeDTO extends UserSummaryDTO {
  email: string;
  emailVerified: boolean;
  /** A new address waiting to be confirmed (the link was sent there). */
  pendingEmail: string | null;
  bio: string | null;
  preferredService: StreamingService | null;
  /** The services they use; null until chosen, meaning all of them. */
  services: StreamingService[] | null;
  notifyPrefs: NotificationPrefs;
  role: 'user' | 'admin';
  /** When onboarding was finished; null means show it. */
  onboardedAt: string | null;
  /** ISO time sharing resumes, or null when sharing. Far future means "until turned back on". */
  sharingPausedUntil: string | null;
  plan: Plan;
  entitlements: Entitlements;
}

/** One emoji on a play, and who left it (newest first). */
export interface ReactionDTO {
  emoji: string;
  count: number;
  users: UserSummaryDTO[];
}

export interface NowPlayingDTO {
  user: UserSummaryDTO;
  track: TrackDTO;
  isPlaying: boolean;
  source: NowPlayingProvider;
  /** The app it's playing in, when a phone reported it (e.g. "Spotify"). */
  sourceApp: string | null;
  /** Link to the source for attribution, e.g. the user's Last.fm profile (required by Last.fm's terms). */
  sourceUrl: string | null;
  progressMs: number | null;
  updatedAt: string;
  /** The play this is, for reactions (null for very old rows). */
  listenId: string | null;
  reactions: ReactionDTO[];
}

/** A feed entry. pinnedAt is set when the viewer pinned this friend. */
export interface FeedItemDTO extends NowPlayingDTO {
  pinnedAt: string | null;
}

/** Pinned first (oldest pin on top, so order is stable), then live listeners, then most recent. */
export function sortFeed<T extends FeedItemDTO>(items: T[]): T[] {
  return [...items].sort(
    (a, b) =>
      Number(Boolean(b.pinnedAt)) - Number(Boolean(a.pinnedAt)) ||
      (a.pinnedAt && b.pinnedAt ? a.pinnedAt.localeCompare(b.pinnedAt) : 0) ||
      Number(b.isPlaying) - Number(a.isPlaying) ||
      b.updatedAt.localeCompare(a.updatedAt),
  );
}

export interface FeaturedSongDTO {
  track: TrackDTO;
  comment: string | null;
  updatedAt: string;
}

export interface RecentPlayDTO {
  listenId: string;
  track: TrackDTO;
  source: NowPlayingProvider;
  playedAt: string;
  reactions: ReactionDTO[];
}

export interface ProfileDTO {
  user: UserSummaryDTO & { bio: string | null };
  followerCount: number;
  followingCount: number;
  isFollowing: boolean;
  isPinned: boolean;
  isSelf: boolean;
  /** They follow the viewer. */
  followsYou: boolean;
  /** The viewer has blocked them (activity is hidden; they can be unblocked). */
  isBlocked: boolean;
  featured: FeaturedSongDTO | null;
  nowPlaying: NowPlayingDTO | null;
  /** Most recent first, not including the track playing right now. */
  recent: RecentPlayDTO[];
  /** Profile links for sources whose data appears here (Last.fm requires attribution). */
  attribution: Partial<Record<'lastfm' | 'listenbrainz', string>>;
}

export interface AdminReportDTO {
  id: string;
  reason: string;
  note: string | null;
  status: 'open' | 'resolved';
  createdAt: string;
  reporter: UserSummaryDTO | null;
  reported: UserSummaryDTO & { suspended: boolean };
}

export interface AdminStatsDTO {
  users: number;
  listeningNow: number;
  openReports: number;
  suspended: number;
}

/** A row in a followers/following list. */
export interface FollowListItemDTO extends UserSummaryDTO {
  /** Whether the viewer follows this person (for Follow/Following buttons). */
  isFollowing: boolean;
}

export interface FollowListDTO {
  users: FollowListItemDTO[];
  /** Pass back as ?cursor= for the next page; null when there are no more. */
  nextCursor: string | null;
}

export interface ConnectionDTO {
  provider: NowPlayingProvider;
  externalUserId: string;
  displayName: string | null;
  status: 'active' | 'error';
  lastError: string | null;
  lastPolledAt: string | null;
  /** Last time this connection saw something playing. */
  lastActivityAt: string | null;
  /** Secret URL the user can paste into Plex/Jellyfin for instant updates. */
  webhookUrl: string | null;
}

export interface TrackSearchResultDTO {
  deezerId: string;
  title: string;
  artist: string;
  album: string | null;
  artworkUrl: string | null;
  durationMs: number | null;
}

/** Messages pushed over the realtime websocket. */
export type RealtimeMessage =
  | { type: 'now_playing'; data: NowPlayingDTO }
  /** Something new in the viewer's notifications. */
  | { type: 'notification'; data: { unread: number } };