/* ShekSlots.hpp
 *
 * Kubo Ryosuke
 */

#ifndef SUNFISH_SEACH_SHEK_SHEKSLOTS_HPP__
#define SUNFISH_SEACH_SHEK_SHEKSLOTS_HPP__

#include "../../common/Def.hpp"
#include "ShekElement.hpp"
#include <cstdint>

using SizeType = uint32_t;

namespace sunfish {

class ShekSlots {
public:

  static CONSTEXPR_CONST SizeType Size = 4;

  ShekElement* findSlot(Zobrist::Type hash) {
    for (SizeType i = 0; i < Size; i++) {
      if (slots_[i].checkHash(hash)) {
        return &slots_[i];
      }
    }
    return nullptr;
  }

  ShekElement* findSlot(Zobrist::Type hash, const HandSet& handSet) {
    for (SizeType i = 0; i < Size; i++) {
      if (slots_[i].checkHash(hash) && slots_[i].handSet() == handSet) {
        return &slots_[i];
      }
    }
    return nullptr;
  }

  ShekElement* findVacantSlot() {
    for (SizeType i = 0; i < Size; i++) {
      if (slots_[i].isVacant()) {
        return &slots_[i];
      }
    }
    return nullptr;
  }

private:

  ShekElement slots_[Size];

};

static_assert(sizeof(ShekElement) == 8, "invalid struct size");
static_assert(sizeof(ShekSlots) <= 32, "invalid struct size");

} // namespace sunfish

#endif // SUNFISH_SEACH_SHEK_SHEKSLOTS_HPP__