# frozen_string_literal: true

module ClashDeckGenerator2
  module Services
    class DeckGenerator
      DECK_SIZE = 8

      def initialize(cards_repo:)
        @cards_repo = cards_repo
      end

      def call(only_meta: true)
        pool = only_meta ? @cards_repo.meta_cards : @cards_repo.all_cards
        deck = sample_unique(pool, DECK_SIZE)

        {
          cards: deck,
          avg_elixir: average_elixir(deck)
        }
      end

      private

      def sample_unique(pool, n)
        raise "Not enough cards in pool (need #{n}, have #{pool.size})" if pool.size < n

        pool.sample(n)
      end

      def average_elixir(deck)
        sum = deck.sum { |c| c[:elixir_cost].to_i }
        sum.fdiv(deck.size).round(2)
      end
    end
  end
end