public StepModel Step()
{
TicTacHelper helper = new TicTacHelper();
List<StepModel> allowedSteps = new List<StepModel>();
List<StepModel> loseEscapeSteps = new List<StepModel>();
// Trying all steps...
for (int x = 1; x <= 3; x++)
for (int y = 1; y <= 3; y++)
{
StepModel step = new StepModel { X = x, Y = y, TicTac = Game.Player2TicTac };
// Check if step is allowed
if (!helper.IsAllowedStep(Game, step))
continue;
// Check if step is win. If it is I do this step immediatelly
List<StepModel> oneStepForward = Game.Steps.ToList();
oneStepForward.Add(step);
if (helper.IsWin(oneStepForward))
return step;
// Check if next enemy step will be win
step.TicTac = Game.Player1TicTac;
List<StepModel> oneEnemyStepForward = Game.Steps.ToList();
oneEnemyStepForward.Add(step);
if (helper.IsWin(oneEnemyStepForward))
{
// Don't forget to set step TicTac back to my TicTac
step.TicTac = Game.Player2TicTac;
loseEscapeSteps.Add(step);
continue;
}
else
step.TicTac = Game.Player2TicTac;
allowedSteps.Add(step);
}
int stepIndex;
// If there are steps which can avoid my loss I selects random from them.
// If there aren't I I selects random from allowed steps.
if (loseEscapeSteps.Any())
{
stepIndex = random.Next(loseEscapeSteps.Count);
return loseEscapeSteps[stepIndex];
}
else if (allowedSteps.Any())
{
stepIndex = random.Next(allowedSteps.Count);
return allowedSteps[stepIndex];
}
else
return null;
}
// Check if step is allowed in game
public bool IsAllowedStep(GameModel game, StepModel step)
{
return !game.Steps.Where(s => s.X == step.X && s.Y == step.Y).Any();
}