move_calculator.hpp

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#pragma once
 
#include <any>
#include <gameboard/board_data_structs.hpp>
#include <gameboard/move_calculator_details.hpp>
#include <gameboard/piece_moves.hpp>
 
using namespace std;
using namespace gameboard;
 
namespace gameboard {
 
class MoveCalculator {
public:
  MoveCalculator()
      : piece_moves_{PieceMoves()}
      , piece_dispatch_array_(build_piece_dispatch_array()) {}
 
  bool IsOccupied(const BoardMap_t &board_map, const BoardSpace &space) {
    return board_map[space.rank][space.file].piece_color != PieceColor::kNul;
  }
 
  void CalcMovesFrom(
      const BoardSpace space,
      MoveCollection &team_moves,
      const BoardMap_t &board_map
  ) {
    ImplementCalcMovesFrom(space, team_moves, board_map);
  }
  MoveCollection CalcAllMovesNoCheckTest(PieceColor color, const BoardMap_t &board_map) {
    return ImplementCalcAllMovesNoCheckTest(color, board_map);
  }
 
private:
  PieceDispatchArray_t piece_dispatch_array_;
  PieceMoves piece_moves_;
 
  // Helpful links for using pointers to class methods  and any_cast:
  // https://opensource.com/article/21/2/ccc-method-pointers
  // https://stackoverflow.com/questions/6265851
  // https://stackoverflow.com/questions/55520876/
  // https://en.cppreference.com/w/cpp/utility/any/any_cast
 
  void ImplementCalcMovesFrom(
      const BoardSpace space,
      MoveCollection &team_moves,
      const BoardMap_t &board_map
  ) {
    auto piece_type = get_type(board_map, space);
    auto color = get_color(board_map, space);
    auto move_func = piece_dispatch_array_[piece_type];
    auto move_func_ptr = any_cast<MethodPtr_t>(move_func);
    (piece_moves_.*move_func_ptr)(board_map, color, space, team_moves);
  }
 
  MoveCollection ImplementCalcAllMovesNoCheckTest(
      PieceColor color,
      const BoardMap_t &board_map
  ) {
    auto untested_moves = MoveCollection(120);
    auto occ_spaces = get_all_spaces_occupied_by(board_map, color);
    for (size_t space = 0; space < occ_spaces.size(); space++) {
      CalcMovesFrom(occ_spaces[space], untested_moves, board_map);
    }
    return untested_moves;
  }
};
 
} // namespace gameboard