/** Computer players for solo practice (docs/06-lobby-rooms.md §12). Shared by server and web (no runtime deps). */
import type { PublicUser } from './types';

/** Bot user ids look like `bot:<n>:<ulid>`; real user ids are plain ULIDs, so they can never collide. */
export const BOT_PREFIX = 'bot:';

export const isBotId = (id: string): boolean => id.startsWith(BOT_PREFIX);

export const makeBotId = (n: number, unique: string): string => `${BOT_PREFIX}${n}:${unique}`;

/** Number shown in the bot's name ("컴퓨터 2"). */
export function botNumber(id: string): number | null {
  if (!isBotId(id)) return null;
  const n = Number(id.slice(BOT_PREFIX.length).split(':')[0]);
  return Number.isInteger(n) && n > 0 ? n : null;
}

/** Public profile of a bot id, or null for anything else. */
export function botProfile(id: string): PublicUser | null {
  const n = botNumber(id);
  return n === null ? null : { id, nickname: `컴퓨터 ${n}`, avatar: null, kind: 'bot' };
}

/**
 * Games that offer computer players. Real-time and talk-based games (도블, 할리갈리, 그림 맞히기, 마피아)
 * don't: a bot there is either unbeatable or meaningless.
 */
export const BOT_GAMES: readonly string[] = [
  'omok',
  'othello',
  'chess',
  'janggi',
  'baduk',
  'seotda',
  'poker',
  'yacht',
  'yut',
  'one-card',
  'rummikub',
  'gostop',
  'bang',
  'davinci-code',
  'mahjong',
  'marble',
  'dalmuti',
  'splendor',
  'quoridor',
  'las-vegas',
  'cockroach-poker',
  'ninety-nine',
];

export const botsAllowed = (gameId: string): boolean => BOT_GAMES.includes(gameId);