/*

File: KlondikeGame.m

Abstract: The classic card solitaire game Klondike.

Version: 1.0

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*/

#import "KlondikeGame.h"

#import "Deck.h"

#import "PlayingCard.h"

#import "Stack.h"

#define kStackHeight 500

/**  WARNING: THIS CODE REQUIRES GARBAGE COLLECTION!

 **  This sample application uses Objective-C 2.0 garbage collection.

 **  Therefore, the source code in this file does NOT perform manual object memory management.

 **  If you reuse any of this code in a process that isn't garbage collected, you will need to

 **  add all necessary retain/release/autorelease calls, and implement -dealloc methods,

 **  otherwise unpleasant leakage will occur!

 **/

@implementation KlondikeGame

- (id) initWithBoard: (CALayer*)board

{

    self = [super initWithBoard: board];

    if (self != nil) {

        [self setNumberOfPlayers: 1];

        _deck = [[Deck alloc] initWithCardsOfClass: [PlayingCard class]];

        [_deck shuffle];

        _deck.position = CGPointMake(kCardWidth/2+16,kCardHeight/2+16);

        [board addSublayer: _deck];

        _sink = [[Deck alloc] init];

        _sink.position = CGPointMake(3*kCardWidth/2+32,kCardHeight/2+16);

        [board addSublayer: _sink];

        for( CardSuit suit=kSuitClubs; suit<=kSuitSpades; suit++ ) {

            Deck *aces = [[Deck alloc] init];

            aces.position = CGPointMake(kCardWidth/2+16+(kCardWidth+16)*(suit%2),

                                        120+kCardHeight+(kCardHeight+16)*(suit/2));

            [board addSublayer: aces];

            _aces[suit] = aces;

        }

        for( int s=0; s<7; s++ ) {

            Stack *stack = [[Stack alloc] initWithStartPos: CGPointMake(kCardWidth/2,

                                                                        kStackHeight-kCardHeight/2.0)

                                                   spacing: CGSizeMake(0,-22)];

            stack.frame = CGRectMake(260+s*(kCardWidth+16),16, kCardWidth,kStackHeight);

            stack.backgroundColor = nil;

            stack.dragAsStacks = YES;

            [board addSublayer: stack];

            // According to the rules, one card should be added to each stack in turn, instead

            // of populating entire stacks one at a time. However, if one trusts the Deck's

            // -shuffle method (which uses the random() function, seeded with a high-entropy

            // cryptographically-strong value), it shouldn't make any difference :-)

            for( int c=0; c<=s; c++ )

                [stack addBit: [_deck removeTopCard]];

            ((Card*)stack.bits.lastObject).faceUp = YES;

        }

        [self nextPlayer];

    }

    return self;

}

- (BOOL) clickedBit: (Bit*)bit

{

    if( [bit isKindOfClass: [Card class]] ) {

        Card *card = (Card*)bit;

        if( card.holder == _deck ) {

            // Click on deck deals 3 cards to the sink:

            for( int i=0; i<3; i++ ) {

                Card *card = [_deck removeTopCard];

                if( card ) {

                    [_sink addCard: card];

                    card.faceUp = YES;

                }

            }

            [self endTurn];

            return YES;

        } else if( card.holder == _sink ) {

            // Clicking the sink when the deck is empty re-deals:

            if( _deck.empty ) {

                [_deck addCards: [_sink removeAllCards]];

                [_deck flip];

                [self endTurn];

                return YES;

            }

        } else {

            // Click on a card elsewhere turns it face-up:

            if( ! card.faceUp ) {

                card.faceUp = YES;

                return YES;

            }

        }

    }

    return NO;

}

- (BOOL) canBit: (Bit*)bit moveFrom: (id<BitHolder>)src

{

    if( [bit isKindOfClass: [DraggedStack class]] ) {

        Card *bottomSrc = [[(DraggedStack*)bit bits] objectAtIndex: 0];

        if( ! bottomSrc.faceUp )

            return NO;

    }

    return YES;

}

- (BOOL) canBit: (Bit*)bit moveFrom: (id<BitHolder>)src to: (id<BitHolder>)dst

{

    if( src==_deck || dst==_deck || dst==_sink )

        return NO;

    // Find the bottom card being moved, and the top card it's moving onto:

    PlayingCard *bottomSrc;

    if( [bit isKindOfClass: [DraggedStack class]] )

        bottomSrc = [[(DraggedStack*)bit bits] objectAtIndex: 0];

    else

        bottomSrc = (PlayingCard*)bit;

    PlayingCard *topDst;

    if( [dst isKindOfClass: [Deck class]] ) {

        // Dragging to an ace pile:

        if( ! [bit isKindOfClass: [Card class]] )

            return NO;

        topDst = (PlayingCard*) ((Deck*)dst).topCard;

        if( topDst == nil )

            return bottomSrc.rank == kRankAce;

        else

            return bottomSrc.suit == topDst.suit && bottomSrc.rank == topDst.rank+1;

    } else {

        // Dragging to a card stack:

        topDst = (PlayingCard*) ((Stack*)dst).topBit;

        if( topDst == nil )

            return bottomSrc.rank == kRankKing;

        else

            return bottomSrc.color != topDst.color && bottomSrc.rank == topDst.rank-1;

    }

}

- (Player*) checkForWinner

{

    for( CardSuit suit=kSuitClubs; suit<=kSuitSpades; suit++ )

        if( _aces[suit].cards.count < 13 )

            return nil;

    return _currentPlayer;

}

@end