export class DeckManager {
  static validate(deck, cardManager) {
    const errors = [];
    if (!deck.commander) {
      errors.push('No commander selected');
    } else {
      const cmd = cardManager.getCard(deck.commander);
      if (!cmd || cmd.type !== 'commander') errors.push('Invalid commander');
    }
    if (!deck.cards || deck.cards.length < 3) {
      errors.push('Deck needs at least 3 assault cards');
    }
    if (deck.cards && deck.cards.length > 10) {
      errors.push('Deck can have at most 10 assault cards');
    }
    const counts = {};
    for (const id of (deck.cards || [])) {
      counts[id] = (counts[id] || 0) + 1;
      if (counts[id] > 3) errors.push(`Too many copies of ${id} (max 3)`);
    }
    return { valid: errors.length === 0, errors };
  }

  static createStarterDeck(cardManager) {
    return {
      id: 'deck_starter',
      name: 'Starter Deck',
      commander: 'imp_cmd_1',
      cards: [
        'imp_trooper_1', 'imp_trooper_1', 'imp_trooper_1',
        'imp_gunner_1', 'imp_gunner_1', 'imp_gunner_1',
        'imp_guardian_1', 'imp_guardian_1', 'imp_guardian_1',
      ]
    };
  }
}