// executes a single trick and stores state in a new TrickContext instance, as well
private void PlaySingleTrick(int trickNum)
{
_frontend.DisplayStartTrick(trickNum);
_gameContext.CurRound.Tricks.Add(new TrickContext(trickNum));
var curRound = _gameContext.CurRound;
var curTrick = curRound.CurTrick;
Player leader = trickNum == 1
? leader = _players[(_players.IndexOf(curRound.Dealer) + 1) % _players.Count]
: leader = curRound.PrevTrick.Winner;
int leaderIndex = _players.IndexOf(leader);
// create a player list that starts at the trick leader and wraps around
List <Player> trickPlayerOrder = _players
.GetRange(leaderIndex, _players.Count - leaderIndex)
.Concat(_players.GetRange(0, leaderIndex)).ToList();
trickPlayerOrder.ForEach(player =>
{
var cardPlayed = player.MakeTurn(_gameContext);
curTrick.CardsPlayed.Add(cardPlayed);
_frontend.DisplayTurnTaken(cardPlayed, player);
});
// find winner and save it to trick context
var winningCard = CardUtils.CalcWinningCard(curTrick.CardsPlayed, curRound.TrumpSuite, curTrick.LeadingSuite);
var winningPlayer = trickPlayerOrder[curTrick.CardsPlayed.IndexOf(winningCard)];
curTrick.Winner = winningPlayer;
_frontend.DisplayTrickWinner(winningPlayer, winningCard);
}
public override Card MakeTurn(GameContext gameContext)
{
var curRound = gameContext.CurRound;
var curTrick = curRound.CurTrick;
var curRoundTricks = curRound.Tricks;
var playableCards = CardUtils.GetPlayableCards(_hand, curTrick.LeadingSuite);
List <Card> allKnownCards = _hand.Concat(curRoundTricks.Aggregate(new List <Card>(), (acc, trick) =>
{
acc.AddRange(trick.CardsPlayed);
return(acc);
})).ToList();
List <Card> remainingCards = new List <Card>(new Deck().Cards);
foreach (var card in allKnownCards)
{
remainingCards.Remove(card);
}
Dictionary <Card, int> winsByCard = playableCards.Aggregate(new Dictionary <Card, int>(), (acc, next) => { acc[next] = 0; return(acc); });
for (int i = 0; i < SIMULATION_COUNT; i++)
{
foreach (var card in playableCards)
{
var curSimRemainingCards = new List <Card>(remainingCards);
var cardsPlayed = new List <Card>(curTrick.CardsPlayed);
cardsPlayed.Add(card);
// each remaining player plays a random card from a randomly generated hand
for (int j = cardsPlayed.Count(); j < gameContext.PlayerCount; j++)
{
// rand hand selected from the remaining cards specific to this simulation
var randHand = takeRandomCardsFromList(curSimRemainingCards, _hand.Count());
var playableCardsFromRandHand = CardUtils.GetPlayableCards(randHand, curTrick.LeadingSuite);
cardsPlayed.Add(playableCardsFromRandHand[_rand.Next() % playableCardsFromRandHand.Count()]);
}
var winningCard = CardUtils.CalcWinningCard(cardsPlayed, curRound.TrumpSuite, curTrick.LeadingSuite);
if (card.Equals(winningCard))
{
winsByCard[card]++;
}
}
}
List <KeyValuePair <Card, double> > cardsSortedByWinPctg = winsByCard.Aggregate(new List <KeyValuePair <Card, double> >(), (acc, nextPair) =>
{
double winPercentage = nextPair.Value * 1.0 / SIMULATION_COUNT;
acc.Add(new KeyValuePair <Card, double>(nextPair.Key, winPercentage));
return(acc);
});
// sort it so that weakest cards are at lower indices and stronger card at higher indices
cardsSortedByWinPctg.Sort((a, b) => a.Value < b.Value ? -1 : 1);
var curBid = curRound.Bids[this];
var curWins = curRound.Results[this];
var roundsLeft = curRound.RoundNum - curRound.Tricks.Count + 1;
/*
* requieredStrengthOfPlay is a value determining strength of card to play based on game context
* given that requiredStrengthOfPlay = k:
*
* k>1 => impossible to win, play strongest card
* k=1 => play strongest cards from here on out to win
* 0<k<1 => sort cards by strength and select closest index to k val
* i.e. k = .6 and 5 cards => choose card 3 /5 ranked by strength
* k=0 => play weakest cards from here on out to win
* k<0 => won too many, impossible to win, play weakest card
*
*/
double requiredStrengthOfPlay = (curBid - curWins) * 1.0 / roundsLeft;
Card cardToPlay = null;
if (requiredStrengthOfPlay >= 1)
{
cardToPlay = cardsSortedByWinPctg.Last().Key;
}
else if (requiredStrengthOfPlay <= 0)
{
cardToPlay = cardsSortedByWinPctg.First().Key;
}
else
{
// requiredStrengthOfPlay between 0 and 1
int indexToPlay = (int)(requiredStrengthOfPlay * cardsSortedByWinPctg.Count());
cardToPlay = cardsSortedByWinPctg[indexToPlay].Key;
}
_frontend.DisplayTurnInProgress(this);
_hand.Remove(cardToPlay);
return(cardToPlay);
}
