ConnectFourManager.cs

using UnityEngine;

namespace ConnectFourGame
{
    public class ConnectFourManager : MonoBehaviour
    {
        private Board board;
        private Player player1;
        private Player player2;
        private Player curr;

        void Start()
        {
            board = new Board();
            player1 = new Player();
            player2 = new Player();
            player1.SetID(1);
            player2.SetID(2);
            curr = player1;

            // TODO: Initialize your Unity board UI here
        }

        // This method should be called from Unity UI when a player makes a move
        public void OnPlayerMove(int col)
        {
            int row = board.Drop(curr.GetID(), col);

            // TODO: Update board visuals in Unity here

            if (board.IsWin(row, col))
            {
                // TODO: Show win message in Unity UI
                Debug.Log($"\n\ncongratulations! player: {curr.GetID()} won\n\n\n");
                // TODO: End game or restart
            }
            else if (board.IsDraw())
            {
                // TODO: Show draw message in Unity UI
                Debug.Log("\n\nREALLY? A DRAW?!\n\n\n");
                // TODO: End game or restart
            }
            else
            {
                curr = (curr == player1) ? player2 : player1;
                // TODO: Update current player indicator in UI
            }
        }

        public void OnUndo()
        {
            board.UnDo();
            curr = (curr == player1) ? player2 : player1;
            // TODO: Update board visuals and current player UI
        }

        public void OnRedo()
        {
            board.ReDo();
            curr = (curr == player1) ? player2 : player1;
            // TODO: Update board visuals and current player UI
        }
    }
}