/*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.

     http://developer.apple.com/samplecode/GeekGameBoard/

     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.

     Redistribution and use in source and binary forms, with or without modification, are permitted

     provided that the following conditions are met:

     * Redistributions of source code must retain the above copyright notice, this list of conditions

       and the following disclaimer.

     * Redistributions in binary form must reproduce the above copyright notice, this list of

       conditions and the following disclaimer in the documentation and/or other materials provided

       with the distribution.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR

     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 

     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-

     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 

     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 

     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 

     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

 #import "Card.h"

 #import "QuartzUtils.h"

 @implementation Card

 static CATransform3D kFaceUpTransform, kFaceDownTransform;

 + (void) initialize

 {

     if( self==[Card class] ) {

         kFaceUpTransform = kFaceDownTransform = CATransform3DIdentity;

         // Construct a 180-degree rotation matrix:

         kFaceDownTransform.m11 = kFaceDownTransform.m33 = -1;

         // The more obvious way to create kFaceDownTransform would be to call

         // CATransform3DMakeRotation(pi,0,1,0), but due to round-off errors, that transform

         // will have non-zero values in some other places, making it appear to CA as a true

         // 3D transform; this will then cause unexpected clipping behaviors when used.

     }

 }

 + (NSRange) serialNumberRange;

 {

     NSAssert1(NO,@"%@ forgot to override +serialNumberRange",self);

     return NSMakeRange(0,0);

 }

 - (id) initWithSerialNumber: (int)serial position: (CGPoint)pos

 {

     self = [super init];

     if (self != nil) {

         _serialNumber = serial;

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

         self.position = pos;

         self.edgeAntialiasingMask = 0;

         _back = [self createBack];

         [self addSublayer: _back];

         _front = [self createFront];

         _front.transform = kFaceDownTransform;

         [self addSublayer: _front];

     }

     return self;

 }

 - (void)encodeWithCoder:(NSCoder *)aCoder

 {

     [super encodeWithCoder: aCoder];

     [aCoder encodeInt: _serialNumber forKey: @"serialNumber"];

 }

 - (id)initWithCoder:(NSCoder *)aDecoder

 {

     self = [super initWithCoder: aDecoder];

     if( self ) {

         _serialNumber = [aDecoder decodeIntForKey: @"serialNumber"];

     }

     return self;

 }

 - (NSString*) description

 {

     return [NSString stringWithFormat: @"%@[#%i]",self.class,_serialNumber];

 }

 @synthesize serialNumber=_serialNumber;

 - (BOOL) faceUp

 {

     return _faceUp;

 }

 - (void) setFaceUp: (BOOL)up

 {

     if( up != _faceUp ) {

         // The Card has separate sub-layers for its front and back. At any time, one of them

         // is hidden, by having a 180 degree rotation about the Y axis.

         // To flip the card, both front and back layers are flipped over.

         CATransform3D xform;

         xform = up ?kFaceUpTransform :kFaceDownTransform;

         _front.transform = xform;

         xform = up ?kFaceDownTransform :kFaceUpTransform;

         _back.transform = xform;

         _faceUp = up;

     }

 }

 - (CALayer*) createFront

 {

     CALayer *front = [[CALayer alloc] init];

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

     front.position = CGPointMake(kCardWidth/2,kCardHeight/2);

     front.edgeAntialiasingMask = 0;

     front.backgroundColor = kWhiteColor;

     front.cornerRadius = 8;

     front.borderWidth = 1;

     front.borderColor = CGColorCreateGenericGray(0.7, 1.0);

     front.doubleSided = NO;         // this makes the layer invisible when it's flipped

     return [front autorelease];

 }

 - (CALayer*) createBack

 {

     CGSize size = self.bounds.size;

     CALayer *back = [[CALayer alloc] init];

     back.bounds = CGRectMake(0,0,size.width,size.height);

     back.position = CGPointMake(kCardWidth/2,kCardHeight/2);

     back.contents = (id) GetCGImageNamed(@"/Library/Desktop Pictures/Classic Aqua Blue.jpg");

     back.contentsGravity = kCAGravityResize;

     back.masksToBounds = YES;

     back.borderWidth = 4;

     back.borderColor = kWhiteColor;

     back.cornerRadius = 8;

     back.edgeAntialiasingMask = 0;

     back.doubleSided = NO;          // this makes the layer invisible when it's flipped

     CATextLayer *label = AddTextLayer(back, @"\u2603",          // Unicode snowman character

                                       [NSFont systemFontOfSize: 0.9*size.width],

                                       kCALayerWidthSizable|kCALayerHeightSizable);

     label.foregroundColor = CGColorCreateGenericGray(1.0,0.5);

     return [back autorelease];

 }    

 #pragma mark -

 #pragma mark DRAG-AND-DROP:

 // An image from another app can be dragged onto a Card to change its background. */

 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender

 {

     NSPasteboard *pb = [sender draggingPasteboard];

     if( [NSImage canInitWithPasteboard: pb] )

         return NSDragOperationCopy;

     else

         return NSDragOperationNone;

 }

 - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender

 {

     CGImageRef image = GetCGImageFromPasteboard([sender draggingPasteboard]);

     if( image ) {

         CALayer *face = _faceUp ?_front :_back;

         face.contents = (id) image;

         face.contentsGravity = kCAGravityResizeAspectFill;

         face.masksToBounds = YES;

         return YES;

     } else

         return NO;

 }

 @end