/**
*
*/
private static void hardLevel(int size)
{
Board.Blank b = new Board.Blank();
if (!isWin(size))
{
Console.WriteLine("Computer is making the move...");
if (gb.blankPlaces(size, size).Count == gb.Size(size))
{
Random r = new Random();
b = new Board.Blank(r.Next(0, size), r.Next(0, size));
}
else
{
b = AI.GetBestMove(gb, Board.user.X, size, size);
}
gb[b.A, b.B] = Board.user.X;
dispBoard(size);
/**
* Check win conditions to stop the game or continue to the next move
*/
if (!isWin(size))
{
NextMove(size);
}
}
}
private static void easyLevel(int size)
{
Board.Blank b = new Board.Blank();
if (!isWin(size))
{
Console.WriteLine("Computer is making the move...");
if (gb.blankPlaces(size, size).Count == gb.Size(size)) //if all spaces are open, randomly pick one for excitement
{
Random r = new Random();
b = new Board.Blank(r.Next(0, size), r.Next(0, size));
}
else
{
Random r = new Random();
do
{
b = new Board.Blank(r.Next(0, size), r.Next(0, size));
} while (gb.isFull(b.A, b.B));
}
gb[b.A, b.B] = Board.user.X;
dispBoard(size);
if (!isWin(size))
{
NextMove(size);
}
}
}
public static Board.Blank GetBestMove(BoardInitialize gb, Board.user p, int length, int width)
{
Board.Blank? bestSpace = null;
List <Board.Blank> openSpaces = gb.blankPlaces(length, width);
BoardInitialize newBoard;
for (int i = 0; i < openSpaces.Count; i++)
{
newBoard = gb.Clone(length, width);
Board.Blank newSpace = openSpaces[i];
newBoard[newSpace.A, newSpace.B] = p;
if (newBoard.Winner(length, width) == Board.user.space && newBoard.blankPlaces(length, width).Count > 0)
{
Board.Blank tempMove = GetBestMove(newBoard, (Board.user)(-(int)p), length, width);
newSpace.Rank = tempMove.Rank;
}
else
{
if (newBoard.Winner(length, width) == Board.user.space)
{
newSpace.Rank = 0;
}
else if (newBoard.Winner(length, width) == Board.user.X)
{
newSpace.Rank = -1;
}
else if (newBoard.Winner(length, width) == Board.user.O)
{
newSpace.Rank = 1;
}
}
if (bestSpace == null ||
(p == Board.user.X && newSpace.Rank < ((Board.Blank)bestSpace).Rank) ||
(p == Board.user.O && newSpace.Rank > ((Board.Blank)bestSpace).Rank))
{
bestSpace = newSpace;
}
}
return((Board.Blank)bestSpace);
}
/**
* Prompt user for their next move
*/
private static void NextMove(int size)
{
int x = 0, y = 0;
string input = "";
Board.Blank b = new Board.Blank();
do
{
Console.WriteLine("What is your move?");
/**
* Error handling for when user selects a row or column that is out of bounds
*/
do
{
Console.WriteLine("Please type a row number from 1 to " + size);
input = Console.ReadLine().Trim();
x = Convert.ToInt32(input) - 1;
Console.WriteLine("Please type a column number from 1 to " + size);
input = Console.ReadLine().Trim();
y = Convert.ToInt32(input) - 1;
if (!(x >= 0 && x < size))
{
Console.WriteLine("Wrong input, please enter row between 1 to " + size);
}
if (!(y >= 0 && y < size))
{
Console.WriteLine("Wrong input, please enter column between 1 to " + size);
}
} while (!((x >= 0 && x < size) && (y >= 0 && y < size)));
b.A = x;
b.B = y;
if (gb.isFull(x, y))
{
Console.WriteLine("Place is already occupied.");
}
} while (gb.isFull(x, y));
gb[b.A, b.B] = Board.user.O;
/**
* Display the board with corrected user inputs and choose AI move based on selected difficulty
*/
dispBoard(size);
if (Level == 1)
{
easyLevel(size);
//break;
}
else if (Level == 2)
{
mediumLevel(size);
// break;
}
else
{
hardLevel(size);
}
/**
* Game is finished.
* Prompt to restart
*/
input = "";
do
{
Console.WriteLine("Want to continue the game(Y/N)");
input = Console.ReadLine().ToLower();
if (input != "y" && input != "n")
{
Console.WriteLine("Invalid input, please enter y/n");
}
else if (input == "y")
{
Console.Clear();
boardLoad();
}
else
{
Console.WriteLine("Thank you for playing Tic-Tac-Toe.");
Thread.Sleep(800);
Environment.Exit(0);
}
} while (input != "y" && input != "n");
}