// Return a new state with the given move on the given state with new reference
private static StringState GetStateWithMove(StringState state, MoveString move)
{
// Deep clone previous state
StringState resultState = TypeConverter.DeepCloneState(state);
// Remove the token from the previous field (if already placed)
resultState = RemoveTokenFromGameState(resultState, move.Token);
// If the field already has a token
if (resultState.ContainsKey(move.Field))
{
Stack <string> tokenStack = new Stack <string>(resultState[move.Field]);
tokenStack.Push(move.Token);
// Place the allowed Token above the old Token
resultState.Remove(move.Field);
resultState.Add(move.Field, tokenStack);
}
else
{
// Otherwise add the Field with a new Stack with the allowed Token
Stack <string> tokenStack = new Stack <string>();
tokenStack.Push(move.Token);
resultState.Add(move.Field, tokenStack);
}
return(resultState);
}
// Returns a new Gamestate without the given Token with new reference
// Removes the Token from the given GameState if it is on the Gamestate
// otherwise the given GameState will be returned with new reference
// (only has to check the peeks because the covered Tokens are ignored by GetAvailableTokensForGameState)
private static StringState RemoveTokenFromGameState(StringState state, string token)
{
// Deep clone the given state without reference
StringState resultState = TypeConverter.DeepCloneState(state);
// Iterate through all available fields of the state
foreach (var field in state)
{
// Check if the token is on the peek of the field
if (field.Value.Peek() == token)
{
// When the field has more than one token
if (field.Value.Count > 1)
{
// Remove the highest token from the field
resultState[field.Key].Pop();
}
// When the token is the only token on the field
else
{
// Remove the field from the state
resultState.Remove(field.Key);
}
}
}
return(resultState);
}
