/*

File: Deck.m

Abstract: A pile of Cards. Unlike a Stack, only the top card is visible or accessible.

Version: 1.0

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*/

#import "Deck.h"

#import "Card.h"

#import "Stack.h"

#import "QuartzUtils.h"

@interface Deck ()

- (void) x_showTopCard;

@end

/**  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 Deck

- (id) init

{

    self = [super init];

    if (self != nil) {

        self.bounds = CGRectMake(0,0,kCardWidth,kCardHeight);

        self.cornerRadius = 8;

        self.backgroundColor = kAlmostInvisibleWhiteColor;

        self.borderColor = kHighlightColor;

        _cards = [NSMutableArray array];

    }

    return self;

}

- (id) initWithCardsOfClass: (Class)klass

{

    self = [self init];

    if (self != nil) {

        // Create a full deck of cards:

        NSRange serials = [klass serialNumberRange];

        for( int i=serials.location; i<NSMaxRange(serials); i++ )

            [_cards addObject: [[klass alloc] initWithSerialNumber: i

                                                          position: CGPointZero]];

        [self x_showTopCard];

    }

    return self;

}

@synthesize cards=_cards;

- (Card*) topCard   {return (Card*)_bit;}

- (void) setBit: (Bit*)bit

{

    NSAssert(NO,@"Don't call -setBit");

}

- (void) x_removeObsoleteCard: (Card*)card

{

    if( [_cards containsObject: card] && card != _bit )

        RemoveImmediately(card);

}

/** Sync up my display with the _cards array. The last element of _cards should be shown,

    and no others (they shouldn't even be in the layer tree, for performance reasons.) */

- (void) x_showTopCard

{

    Card *curTopCard = [_cards lastObject];

    if( curTopCard != _bit ) {

        if( _bit ) {

            // Remove card that used to be the top one

            if( [_cards containsObject: _bit] )   // wait till new card animates on top of it

                [self performSelector: @selector(x_removeObsoleteCard:) withObject: _bit afterDelay: 1.0];

            else

                RemoveImmediately(_bit);

        }

        _bit = curTopCard;

        if( curTopCard ) {

            if( curTopCard.superlayer==self ) {

                [self addSublayer: curTopCard]; // move to top

                curTopCard.position = GetCGRectCenter(self.bounds);

            } else {

                if( curTopCard.superlayer )

                    ChangeSuperlayer(curTopCard, self, -1);

                curTopCard.position = GetCGRectCenter(self.bounds);

                if( ! curTopCard.superlayer )

                    [self addSublayer: curTopCard];

            }

        }

    }

}

- (void) shuffle

{

    int n = _cards.count;

    NSMutableArray *shuffled = [NSMutableArray arrayWithCapacity: n];

    for( ; n > 0; n-- ) {

        int i = random() % n;

        Card *card = [_cards objectAtIndex: i];

        [shuffled addObject: card];

        [_cards removeObjectAtIndex: i];

    }

    _cards = shuffled;

    [self x_showTopCard];

}

- (void) flip

{

    int n = _cards.count;

    NSMutableArray *flipped = [NSMutableArray arrayWithCapacity: n];

    while( --n >= 0 ) {

        Card *card = [_cards objectAtIndex: n];

        card.faceUp = ! card.faceUp;

        [flipped addObject: card];

    }

    _cards = flipped;

    [self x_showTopCard];

}

- (void) addCard: (Card*)card

{

    [_cards addObject: card];

    [self x_showTopCard];

}

- (void) addCardAtBottom: (Card*)card

{

    [_cards insertObject: card atIndex: 0];

    if( _cards.count==1 )

        [self x_showTopCard];

}

- (void) addCardAtRandom: (Card*)card

{

    // Put the card at some random location, but _not_ on top (unless the deck is empty.)

    int n = _cards.count;

    if( n==0 )

        [self addCard: card];

    else

        [_cards insertObject: card atIndex: (random() % (n-1))];

}

- (void) addCards: (NSArray*)cards

{

    [_cards addObjectsFromArray: cards];

    [self x_showTopCard];

}

- (BOOL) addBit: (Bit*)bit

{

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

        // Convert a DraggedStack back to a group of Cards:

        for( Bit *subBit in [(DraggedStack*)bit bits] )

            if( ! [self addBit: subBit] )

                return NO;

        return YES;

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

        [self addCard: (Card*)bit];

        return YES;

    } else

        return NO;

}

- (Card*) removeTopCard

{

    Card *card = [_cards lastObject];

    if( card ) {

        [_cards removeLastObject];

        _bit = nil;   // keep it from being removed from superlayer by _showTopCard

        [self x_showTopCard];

    }

    return card;

}

- (NSArray*) removeAllCards

{

    NSArray *removedCards = _cards;

    _cards = [NSMutableArray array];

    [removedCards makeObjectsPerformSelector: @selector(removeFromSuperlayer)];

    [self x_showTopCard];

    return removedCards;

}

#pragma mark -

#pragma mark BITHOLDER INTERFACE:

- (Bit*) canDragBit: (Bit*)bit

{

    if( bit == _bit ) {

        [_cards removeObjectIdenticalTo: bit];

        _bit = nil;   // prevent the card from being removed from my layer

        [self x_showTopCard];

        return bit;

    } else

        return nil;

}

- (void) cancelDragBit: (Bit*)bit

{

    [self addCard: (Card*)bit];

}

- (void) draggedBit: (Bit*)bit to: (id<BitHolder>)dst   {}

- (void) setHighlighted: (BOOL)h    

{

    [super setHighlighted: h];

    self.borderWidth = h ?6 :0;

}

- (BOOL) canDropBit: (Bit*)bit atPoint: (CGPoint)point

{

    return [bit isKindOfClass: [Card class]] || [bit isKindOfClass: [DraggedStack class]];

}

- (BOOL) dropBit: (Bit*)bit atPoint: (CGPoint)point

{

    return [self addBit: bit];

}

@end