public GameState Execute(GameState gameState)
{
// Enforce rules
Validate(gameState);
var nextAvailableTokens = gameState.Bank.CreateCopy();
var nextPlayerTokens = gameState.CurrentPlayer.Purse.CreateCopy();
// Perform transaction
foreach (var colour in TokensToTake.Colours().Union(TokensToReturn.Colours()).ToArray())
{
// Take coins
nextAvailableTokens[colour] -= TokensToTake[colour];
nextPlayerTokens[colour] += TokensToTake[colour];
// Return coins
nextAvailableTokens[colour] += TokensToReturn[colour];
nextPlayerTokens[colour] -= TokensToReturn[colour];
}
var player = gameState.CurrentPlayer with {
Purse = nextPlayerTokens
};
return(gameState.WithUpdatedPlayerByName(player) with {
Bank = nextAvailableTokens
});
public override string ToString()
{
var things = TokensToTake.Colours().Select(col => (TokensToTake[col] == 1 ? "" : $"{TokensToTake[col]} ") + $"{col}");
var thingsBack = TokensToReturn.Colours().Select(col => (TokensToReturn[col] == 1 ? "" : $"{TokensToReturn[col]} ") + $"{col}");
var returning = TokensToReturn.Sum == 0 ? "" : $", returning {string.Join(", ", thingsBack)}";
return($"Taking {string.Join(", ", things)}{returning}");
}
private void Validate(GameState gameState)
{
var player = gameState.CurrentPlayer;
if (TokensToTake.Sum > 3)
{
throw new RulesViolationException("You can only take up to three different tokens, or two of the same if there are four of that type available.");
}
else if (TokensToTake.Colours().Any(col => TokensToTake[col] > 2))
{
throw new RulesViolationException("You can only take up to two tokens of any one colour.");
}
if (TokensToTake[TokenColour.Gold] > 0)
{
throw new RulesViolationException("You can't take gold tokens, except when reserving cards.");
}
if (TokensToTake.Colours().Any(col => TokensToTake[col] == 2)) // If two taken
{
if (TokensToTake.Colours().Count() > 1)
{
throw new RulesViolationException("You can only take two tokens of the same colour if you take no other tokens.");
}
var doubleCoinColour = TokensToTake.Colours().Single();
if (gameState.Bank[doubleCoinColour] < 4)
{
throw new RulesViolationException("You can only take two tokens of the same colour if there are four or more available of that colour.");
}
}
var totalCoinsAfterTransaction = player.Purse.Sum + TokensToTake.Sum - TokensToReturn.Sum;
if (totalCoinsAfterTransaction > 10)
{
throw new RulesViolationException("A player cannot end a turn with more than 10 tokens.");
}
foreach (var colour in TokensToTake.Colours())
{
if (gameState.Bank[colour] < TokensToTake[colour])
{
throw new RulesViolationException($"There aren't enough {colour} tokens to take.");
}
}
foreach (var colour in TokensToReturn.Colours())
{
if (player.Purse[colour] + TokensToTake[colour] < TokensToReturn[colour])
{
throw new RulesViolationException($"The player doesn't have enough {colour} tokens to give back.");
}
}
}
public GameState Execute(GameState gameState)
{
// Enforce rules
Validate(gameState);
var nextAvailableTokens = gameState.Bank.CreateCopy();
var nextPlayerTokens = gameState.CurrentPlayer.Purse.CreateCopy();
// Perform transaction
foreach (var colour in TokensToTake.Colours().Union(TokensToReturn.Colours()).ToArray())
{
// Take coins
nextAvailableTokens[colour] -= TokensToTake[colour];
nextPlayerTokens[colour] += TokensToTake[colour];
// Return coins
nextAvailableTokens[colour] += TokensToReturn[colour];
nextPlayerTokens[colour] -= TokensToReturn[colour];
}
var player = gameState.CurrentPlayer.Clone(withPurse: nextPlayerTokens);
return(gameState.Clone(withTokensAvailable: nextAvailableTokens).CloneWithPlayerReplacedByName(player));
}