import { beforeEach, describe, expect, it } from 'vitest';
import { clearLobby, getLobby, patchLobbyGame, setLobby } from './lobbycache';
import type { AccountRef, GameView } from './model';

function gameView(id: string, status: GameView['status'] = 'active', toMove = 0): GameView {
  return {
    id,
    variant: 'scrabble_en',
    dictVersion: 'v1',
    status,
    players: 2,
    toMove,
    turnTimeoutSecs: 300,
    multipleWordsPerTurn: true,
    moveCount: 0,
    endReason: '',
    lastActivityUnix: 0,
    seats: [],
  };
}

beforeEach(() => clearLobby());

describe('patchLobbyGame', () => {
  it('replaces the matching game by id and leaves the others untouched', () => {
    setLobby({ games: [gameView('a', 'active', 0), gameView('b', 'active', 0)], invitations: [], incoming: [] });
    // The player's own move flipped game "a" to the opponent's turn.
    patchLobbyGame(gameView('a', 'active', 1));
    const snap = getLobby();
    expect(snap?.games.map((g) => g.id)).toEqual(['a', 'b']);
    expect(snap?.games.find((g) => g.id === 'a')?.toMove).toBe(1);
    expect(snap?.games.find((g) => g.id === 'b')?.toMove).toBe(0);
  });

  it('preserves invitations and incoming when patching a game', () => {
    const incoming: AccountRef[] = [{ accountId: 'u9', displayName: 'Nine' }];
    setLobby({ games: [gameView('a')], invitations: [], incoming });
    patchLobbyGame(gameView('a', 'finished'));
    expect(getLobby()?.incoming).toEqual(incoming);
    expect(getLobby()?.games[0].status).toBe('finished');
  });

  it('adds the game when it is not yet in the cached lobby (a game started elsewhere)', () => {
    setLobby({ games: [gameView('a')], invitations: [], incoming: [] });
    patchLobbyGame(gameView('z', 'active'));
    // Order is irrelevant — the lobby re-groups and re-sorts on render — so assert membership.
    expect(getLobby()?.games.map((g) => g.id).sort()).toEqual(['a', 'z']);
  });

  it('is a no-op when there is no cached lobby yet', () => {
    patchLobbyGame(gameView('a'));
    expect(getLobby()).toBeNull();
  });

  it('does not mutate the previous snapshot array', () => {
    const games = [gameView('a', 'active', 0)];
    setLobby({ games, invitations: [], incoming: [] });
    patchLobbyGame(gameView('a', 'active', 1));
    expect(games[0].toMove).toBe(0); // the original array/object is left intact
  });
});