#pragma once
#include <array>
#include <vector>

using namespace std;

// Need to rethink struct Move when gravity toggling
// is implemented in the future.  For now, tokens placed
// on the board fall to the lowest unoccupied height 
// for a given pin (uniquely identified by row and column).

struct Move { int row, col; };

// GameBoard class definition

class GameBoard {
   public:
      GameBoard();

      bool isValid(int r, int c) const;
      bool isValid(int r, int c, int z) const;  // future use with gravity toggling
      void updateBoard(int r, int c, int piece);
      void updateBoard(int r, int c, int z, int piece); // future use with gravity toggling
      void undoMove(int r, int c);
      void undoMove(int r, int c, int z);  // future use with gravity toggling
      bool movesLeft() const;
      int checkWinner() const;
      int evaluateBoard() const;
      int minimax(int depth, int player, int alpha, int beta, int maxDepth);
      Move findBestMove(int depth, int player);
      void computerMove(int depth);
      void displayBoard() const;

private:
    array<array<array<int, 4>, 4>, 4> board;
    vector<vector<array<int,3>>> winningLines;
    void findWinningLines();
};