piece_moves.hpp

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#pragma once
 
#include <gameboard/board_data_structs.hpp>
#include <gameboard/move_data_structs.hpp>
 
using namespace gameboard;
 
namespace gameboard {
 
extern const array<BoardDirection, 2> kSideDirections;
extern const vector<pair<BoardDirection, vector<BoardDirection>>> kHorsePaths;
extern const vector<BoardDirection> kAllOrthogonalDirections;
extern const vector<BoardDirection> kAllDiagonalDirections;
 
class PieceMoves {
public:
  void SoldierMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void CannonMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void ChariotMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void HorseMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void ElephantMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void AdvisorMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void FlyingGeneralMove(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void StandardGeneralMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
  void GeneralMoves(
      const BoardMap_t &board_map,
      PieceColor color,
      const BoardSpace &space,
      MoveCollection &team_moves
  );
 
private:
  static inline BoardDirection FwdDirection(PieceColor color) {
    return BoardDirection{static_cast<int>(color), 0};
  }
 
  static inline bool ExistsAndPassesColorTest(
      const BoardMap_t &board_map,
      const BoardSpace &space,
      PieceColor moving_piece_color
  ) {
    return space.IsOnBoard() &&
           get_color(board_map, space) != static_cast<PieceColor>(moving_piece_color);
  }
};
} // namespace gameboard