/// <summary>
/// In Nim a valid move is defined as removing from 1 to all tokens from 1 row,
/// this methods verifies that the difference between the first parameter
/// and the second constitutes a valid move.
/// </summary>
/// <param name="currentState">The current state of the game board</param>
/// <param name="proposedState">The state which an AI or Player's move will result in</param>
/// <returns>If the move the AI or Player is making is valid</returns>
public static bool IsMoveValid(BoardState currentState, BoardState proposedState)
{
if (currentState.RowCounts[0] > proposedState.RowCounts[0] &&
proposedState.RowCounts[0] >= 0)
{
if (currentState.RowCounts[1] == proposedState.RowCounts[1] &&
currentState.RowCounts[2] == proposedState.RowCounts[2]) return true;
}
if (currentState.RowCounts[1] > proposedState.RowCounts[1] &&
proposedState.RowCounts[1] >= 0)
{
if (currentState.RowCounts[0] == proposedState.RowCounts[0] &&
currentState.RowCounts[2] == proposedState.RowCounts[2]) return true;
}
if (currentState.RowCounts[2] > proposedState.RowCounts[2] &&
proposedState.RowCounts[2] >= 0)
{
if (currentState.RowCounts[0] == proposedState.RowCounts[0] &&
currentState.RowCounts[1] == proposedState.RowCounts[1]) return true;
}
return false;
}
public void RunPlayerVersusAIGame()
{
GameState = new BoardState();
MoveList.Clear();
Random randomGen = new Random();
//Randomly choose the AI to take first turn.
if (randomGen.Next(2) % 2 == 0)
{
GameState = NimAI_1.TakeTurn(GameState);
MoveList.Add(GameState);
Console.WriteLine();
GameState.PrintBoard();
Console.WriteLine("After AI Turn. Any Key To Continue");
Console.ReadLine();
}
do
{
Console.Clear();
GameState.PrintBoard();
GameState = UserConsoleInput.GetPlayerTurnInput(GameState);
MoveList.Add(GameState);
Console.WriteLine();
Console.WriteLine("After Player Turn.");
GameState.PrintBoard();
if (GameState.TotalLeft <= 0)
{
GameOver("AI_1");
break;
}
GameState = NimAI_1.TakeTurn(GameState);
MoveList.Add(GameState);
Console.WriteLine();
Console.WriteLine("After AI Turn");
GameState.PrintBoard();
if (GameState.TotalLeft <= 0)
{
GameOver("Player");
break;
}
Console.WriteLine("Press Any Key To Continue. ");
Console.ReadLine();
}
while (Playing);
NimLogic.WeightBoardStates(ref MoveList);
NimAI_1.IntegrateIntoCatalog(MoveList);
Console.ReadLine();
}
public BoardState(BoardState b)
{
this.RowCounts = new int[3];
for (int r = 0; r < RowCounts.Length; r++)
this.RowCounts[r] = b.RowCounts[r];
this.StateValue = b.StateValue;
this.Frequency = b.Frequency;
}
/// <summary>
/// Used to determine all possible moves based upon the current BoardState
/// </summary>
/// <param name="currentState">Current Game's BoardState</param>
/// <param name="weightedStateList">List to look for possible moves from</param>
/// <returns>Each valid move from the provided list</returns>
public static IEnumerable<BoardState> GetAllValidMoves(BoardState currentState, List<BoardState> weightedStateList)
{
foreach (var bs in weightedStateList)
{
if (IsMoveValid(currentState, bs))
yield return bs;
}
}
public static BoardState EmptyBoardState()
{
BoardState emptyBoard = new BoardState();
emptyBoard.RowCounts[0] = 0;
emptyBoard.RowCounts[1] = 0;
emptyBoard.RowCounts[2] = 0;
emptyBoard.StateValue = -1000;
return emptyBoard;
}
/// <summary>
/// Runs the logic for an AI to make a move. Iterates through all valid moves and returns the highest weighted possible move.
/// </summary>
/// <param name="currentState">Current Game's BoardState</param>
/// <returns>The AI's chosen move, guaranteed to be a valid move.</returns>
public BoardState TakeTurn(BoardState currentState)
{
BoardState moveToMake = BoardState.EmptyBoardState();
Random random = new Random();
foreach(var b in NimLogic.GetAllValidMoves(currentState, BoardStateCatalog))
{
if (b.StateValue > moveToMake.StateValue)
moveToMake = new BoardState(b);
else if (b.StateValue == moveToMake.StateValue)
if(random.Next(2) == 0) moveToMake = new BoardState(b);
}
return moveToMake;
}
/// <summary>
/// Used to provide a list of all possible BoardStates.
/// </summary>
/// <returns></returns>
public static IEnumerable<BoardState> EveryPossibleBoardState()
{
for (int rowA = 0; rowA <= 3; rowA++)
{
for (int rowB = 0; rowB <= 5; rowB++)
{
for (int rowC = 0; rowC <= 7; rowC++)
{
BoardState b = new BoardState();
b.Frequency = 0;
b.StateValue = 0;
b.RowCounts[0] = rowA;
b.RowCounts[1] = rowB;
b.RowCounts[2] = rowC;
yield return b;
}
}
}
}
public void RunAIVersusAIGame()
{
GameState = new BoardState();
MoveList.Clear();
Random randomGen = new Random();
if (randomGen.Next(2) % 2 == 0)
{
GameState = NimAI_2.TakeTurn(GameState);
MoveList.Add(GameState);
}
do
{
GameState = NimAI_1.TakeTurn(GameState);
MoveList.Add(GameState);
if (GameState.TotalLeft <= 0)
{
GameOver("AI_2");
break;
}
GameState = NimAI_2.TakeTurn(GameState);
MoveList.Add(GameState);
if (GameState.TotalLeft <= 0)
{
GameOver("AI_1");
break;
}
}
while (Playing);
NimLogic.WeightBoardStates(ref MoveList);
NimAI_1.IntegrateIntoCatalog(MoveList);
NimAI_2.IntegrateIntoCatalog(MoveList);
}
/// <summary>
/// Runs through the logic required to create a new BoardState based upon
/// the currentState and user input. First queries the user for which row using
/// ForceConsoleIntegerInput and checks that the row has more than 0 tokens.
/// Then asks for how many tokens to remove using ForceConsoleIntegerInput.
/// </summary>
/// <param name="currentState">Current game's BoardState</param>
/// <returns>A BoardState created from the currentState and UserInput</returns>
public static BoardState GetPlayerTurnInput(BoardState currentState)
{
BoardState newState = new BoardState(currentState);
do
{
int row = 0;
bool validChoice = false;
do
{
row = ForceConsoleIntegerInput("Choose a Row(1-3): ", "Invalid Input.", 1, 3);
validChoice = newState.RowCounts[row - 1] > 0;
}
while (!validChoice);
newState.RowCounts[row - 1] -= ForceConsoleIntegerInput("Choose an amount(1-" + currentState.RowCounts[row - 1] + "): ",
"Invalid Input.", 1, currentState.RowCounts[row - 1]);
}
while (!NimLogic.IsMoveValid(currentState, newState));
return newState;
}
public void ApplyNewData(BoardState state)
{
float totalValue = (float)Frequency * StateValue;
totalValue += state.StateValue;
Frequency++;
StateValue = totalValue / Frequency;
}
public bool Equals(BoardState board)
{
if (board.RowCounts.Length != this.RowCounts.Length) return false;
for(int r = 0; r < RowCounts.Length; r++)
if(board.RowCounts[r] != this.RowCounts[r]) return false;
return true;
}
