const registry = new Map();

export function registerGame(definition) {
  if (!definition?.slug) throw new Error('Game definition needs a slug.');
  registry.set(definition.slug, {
    slug: definition.slug,
    name: definition.name ?? definition.slug,
    category: definition.category ?? 'tabletop',
    cardGame: definition.cardGame ?? false,
    minPlayers: definition.minPlayers ?? 2,
    maxPlayers: definition.maxPlayers ?? 2,
    minOpponents: definition.minOpponents ?? 1,
    maxOpponents: definition.maxOpponents ?? 1,
    supportsMultiplayer: definition.supportsMultiplayer ?? true,
    multiplayerOnly: definition.multiplayerOnly ?? false,
  });
}

export function listGames() {
  return [...registry.values()];
}

export function getGame(slug) {
  return registry.get(slug) ?? null;
}

// Built-in placeholders so the menu has something to show.
registerGame({ slug: 'backgammon', name: 'Backgammon', category: 'tabletop', minPlayers: 2, maxPlayers: 2, minOpponents: 1, maxOpponents: 1, multiplayerOnly: false });
registerGame({ slug: 'parchisi', name: 'Parchisi', category: 'tabletop', minPlayers: 1, maxPlayers: 4, minOpponents: 3, maxOpponents: 3, multiplayerOnly: false });
registerGame({ slug: 'blackjack', name: 'Blackjack', category: 'casino', cardGame: true, minPlayers: 1, maxPlayers: 5, minOpponents: 0, maxOpponents: 4, multiplayerOnly: false });
registerGame({ slug: 'holdem', name: "Texas Hold 'Em", category: 'casino', cardGame: true, minPlayers: 2, maxPlayers: 8, minOpponents: 3, maxOpponents: 3, multiplayerOnly: false });