// Domain model — plain TypeScript shapes the screens use, deliberately decoupled
// from the FlatBuffers wire types. Both the real transport (which decodes
// FlatBuffers) and the mock transport speak this model, so the UI never touches
// generated wire code directly.

export type Variant = 'scrabble_en' | 'scrabble_ru' | 'erudit_ru';

/** Backend game status strings. 'open' is an auto-match game the player has entered
 *  but which is still waiting for an opponent (the opponent seat has no account). */
export type GameStatus = 'active' | 'finished' | 'open' | string;

/** Decoded move action kinds (history-independent, see ARCHITECTURE §9.1). */
export type MoveAction = 'play' | 'pass' | 'exchange' | 'resign' | 'timeout' | string;

/** Play orientation: H is across a row, V is down a column. */
export type Direction = 'H' | 'V';

export interface Tile {
  row: number;
  col: number;
  letter: string;
  blank: boolean;
}

export interface Seat {
  seat: number;
  accountId: string;
  displayName: string;
  score: number;
  hintsUsed: number;
  isWinner: boolean;
}

export interface GameView {
  id: string;
  variant: Variant;
  dictVersion: string;
  status: GameStatus;
  players: number;
  toMove: number;
  turnTimeoutSecs: number;
  /** true = standard Scrabble; false = the single-word rule (Russian games). */
  multipleWordsPerTurn: boolean;
  moveCount: number;
  endReason: string;
  /** Lobby sort key: the current turn's start (active) or the finish time (finished), Unix seconds. */
  lastActivityUnix: number;
  /** true = an honest-AI game: the opponent is shown as 🤖 and chat/nudge/add-friend are disabled. */
  vsAi: boolean;
  /** Per-viewer flag: the requesting player has at least one unread chat entry (message or
   *  nudge) in this game. Set on the authoritative REST views (lobby list, game state,
   *  move result); the live-event GameView leaves it false (events bump unread instead). */
  unreadChat: boolean;
  seats: Seat[];
}

export interface MoveRecord {
  player: number;
  action: MoveAction;
  dir: string;
  mainRow: number;
  mainCol: number;
  tiles: Tile[];
  words: string[];
  count: number;
  score: number;
  total: number;
}

/** A seated player's private view of a game. */
export interface StateView {
  game: GameView;
  seat: number;
  rack: string[];
  bagLen: number;
  hintsRemaining: number;
}

export interface MoveResult {
  move: MoveRecord;
  game: GameView;
  /** The actor's refilled rack after the move, so the mover renders the next state without a refetch. */
  rack: string[];
  bagLen: number;
}

export interface HintResult {
  move: MoveRecord;
  hintsRemaining: number;
}

export interface EvalResult {
  legal: boolean;
  score: number;
  words: string[];
  /** Orientation the backend inferred for the play ("H"/"V"), empty when illegal. */
  dir: string;
}

export interface WordCheckResult {
  word: string;
  legal: boolean;
}

export interface ChatMessage {
  id: string;
  gameId: string;
  senderId: string;
  kind: string;
  body: string;
  createdAtUnix: number;
}

/** FeedbackReply is the operator's answer shown on the feedback screen. */
export interface FeedbackReply {
  body: string;
  repliedAtUnix: number;
}

/**
 * FeedbackState is the feedback screen state. blockedReason is "" (can send),
 * "pending" (a previous message is still under review) or "banned"; reply is the
 * operator's answer to show, or null.
 */
export interface FeedbackState {
  canSend: boolean;
  blockedReason: string;
  reply: FeedbackReply | null;
}

export interface Profile {
  userId: string;
  displayName: string;
  preferredLanguage: string;
  timeZone: string;
  /** "HH:MM" daily away-window bounds, in timeZone. */
  awayStart: string;
  awayEnd: string;
  hintBalance: number;
  blockChat: boolean;
  blockFriendRequests: boolean;
  isGuest: boolean;
  /** Confine notifications to the in-app stream (no out-of-app platform push). */
  notificationsInAppOnly: boolean;
  /** The advertising-banner block, present only for a viewer eligible to see it. */
  banner?: Banner;
}

/** Banner is the advertising-banner block of an eligible viewer's profile. */
export interface Banner {
  campaigns: BannerCampaign[];
  timings: BannerTimings;
}

/** BannerCampaign is one campaign in the rotation feed. */
export interface BannerCampaign {
  /** GCD-reduced show weight for the client's smooth weighted round-robin. */
  weight: number;
  /** Messages in display order, already resolved to the viewer's bot language. */
  messages: string[];
}

/** BannerTimings are the global banner display timings (ms, except scrollPxPerSec). */
export interface BannerTimings {
  holdMs: number;
  edgePauseMs: number;
  scrollPxPerSec: number;
  fadeOutMs: number;
  gapMs: number;
  fadeInMs: number;
}

/** BlockStatus is the caller's current manual block, fetched after any call reports
 *  the "account_blocked" code. When blocked the app shows the terminal blocked screen
 *  and stops all push/poll. */
export interface BlockStatus {
  blocked: boolean;
  permanent: boolean;
  /** RFC3339 UTC instant for a temporary block; "" for a permanent one or when not blocked. */
  until: string;
  /** Operator reason resolved to the account's language; "" when none was cited. */
  reason: string;
}

/** The full editable profile sent to profileUpdate (overwrites every field). */
export interface ProfileUpdate {
  displayName: string;
  preferredLanguage: string;
  timeZone: string;
  awayStart: string;
  awayEnd: string;
  blockChat: boolean;
  blockFriendRequests: boolean;
  notificationsInAppOnly: boolean;
}

/** A referenced account with its display name (friend, blocked user, invitee). */
export interface AccountRef {
  accountId: string;
  displayName: string;
}

/** A freshly issued one-time friend code (the plaintext is returned once). */
export interface FriendCode {
  code: string;
  expiresAtUnix: number;
}

/** A durable account's lifetime statistics. */
export interface Stats {
  wins: number;
  losses: number;
  draws: number;
  maxGamePoints: number;
  maxWordPoints: number;
}

/** Settings the inviter chooses for a friend game. */
export interface InvitationSettings {
  variant: Variant;
  turnTimeoutSecs: number;
  hintsAllowed: boolean;
  hintsPerPlayer: number;
  dropoutTiles: 'remove' | 'return';
  /** true = standard Scrabble; false = the single-word rule (Russian games). */
  multipleWordsPerTurn: boolean;
}

export interface InvitationInvitee {
  accountId: string;
  displayName: string;
  seat: number;
  response: 'pending' | 'accepted' | 'declined' | string;
}

export interface Invitation {
  id: string;
  inviter: AccountRef;
  invitees: InvitationInvitee[];
  variant: Variant;
  turnTimeoutSecs: number;
  hintsAllowed: boolean;
  hintsPerPlayer: number;
  /** true = standard Scrabble; false = the single-word rule (Russian games). */
  multipleWordsPerTurn: boolean;
  dropoutTiles: string;
  status: string;
  gameId: string;
  expiresAtUnix: number;
}

/** A finished game's GCG transcript for download/share. */
export interface GcgExport {
  gameId: string;
  filename: string;
  content: string;
}

export interface Session {
  token: string;
  userId: string;
  isGuest: boolean;
  displayName: string;
  // supportedLanguages is the set of game languages the service the user signed in
  // through offers (subset of {en, ru}, at least one). New Game offers only the
  // variants these languages support (en -> English; ru -> Russian + Эрудит). Empty
  // means ungated (all variants).
  supportedLanguages: string[];
  // serviceLanguage is the en/ru tag of the Telegram bot this session was minted
  // through (empty for a non-Telegram login); used to share a link to the same bot.
  serviceLanguage: string;
}

// LinkResult is the outcome of an account link/merge step. status is
// 'linked' (bound to the current account), 'merge_required' (the identity belongs to
// another account — the secondary* fields summarise it for the irreversible
// confirmation) or 'merged'. session is set only when the active account switched
// (a guest initiator whose durable counterpart won); the client adopts it.
export interface LinkResult {
  status: 'linked' | 'merge_required' | 'merged';
  secondaryUserId: string;
  secondaryDisplayName: string;
  secondaryGames: number;
  secondaryFriends: number;
  session: Session | null;
}

export interface MatchResult {
  matched: boolean;
  game?: GameView;
}

export interface History {
  gameId: string;
  moves: MoveRecord[];
}

export interface GameList {
  games: GameView[];
  /** True when the caller has reached the simultaneous quick-game cap; the lobby then
   *  disables "New Game" and shows a notice. */
  atGameLimit: boolean;
}

/**
 * A live event delivered over the Subscribe stream. The game events carry the move as a
 * delta — move plus the post-move summary (and the bag size) — the client applies to its
 * cached game without a refetch; match_found / game_started / opponent_joined carry the
 * recipient's StateView; notify carries the changed lobby payload. The enriched fields are optional
 * so a client falls back to a refetch when a payload is absent (a gap, or an older peer).
 */
export type PushEvent =
  | { kind: 'your_turn'; gameId: string; deadlineUnix: number; opponentName: string; moveCount: number }
  | { kind: 'opponent_moved'; gameId: string; move?: MoveRecord; game?: GameView; bagLen: number }
  | { kind: 'game_over'; gameId: string; result: string; scoreLine: string; game?: GameView }
  | { kind: 'chat_message'; message: ChatMessage }
  | { kind: 'nudge'; gameId: string; fromUserId: string; senderName: string }
  | { kind: 'match_found'; gameId: string; state?: StateView }
  | { kind: 'opponent_joined'; gameId: string; state?: StateView }
  | { kind: 'notify'; sub: string; account?: AccountRef; invitation?: Invitation; state?: StateView }
  | { kind: 'heartbeat' };