#include "goal.hpp"

namespace solitaire {
auto
Goal::getEmptyId() -> std::optional<int> {
  int counter = 0;
  for (const auto& slot : goal) {
    if (!slot) {
      return counter;
    }
    ++counter;
  }
  return std::nullopt;
}

[[nodiscard]] auto
Goal::getId(CardType suit) const noexcept -> std::optional<int> {
  int counter = 0;
  for (const auto& slot : goal) {
    if (slot && slot->type == suit) {
      return counter;
    }
    ++counter;
  }
  return std::nullopt;
}

[[nodiscard]] auto
Goal::get(CardType suit) const noexcept -> std::optional<int> {
  if (auto index = getId(suit); index) {
    return goal[*index]->value;
  }
  return std::nullopt;
}

void
Goal::set(CardType suit, int value) noexcept {
  assert(value >= 0);
  assert(value <= 9);

  const auto card = [&]() -> std::optional<Card> {
    if (value == 0) {
      return std::nullopt;
    }
    return Card{suit, value};
  }();

  const int goal_index = [&]() -> int {
    if (auto index = getId(suit); index) {
      return *index;
    }
    return *getEmptyId();
  }();

  goal[goal_index] = card;
}

void
Goal::inc(CardType suit) noexcept {
  auto get_value = get(suit);
  int new_value = get_value ? (*get_value) + 1 : 1;
  set(suit, new_value);
}

} // namespace solitaire