/*  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 "Bit.h"

 #import "Game.h"

 #import "QuartzUtils.h"

 @implementation Bit

 - (id) copyWithZone: (NSZone*)zone

 {

     // NSLayer isn't copyable, but it is archivable. So create a copy by archiving to

     // a temporary data block, then unarchiving a new layer from that block.

     // One complication is that, due to a bug in Core Animation, CALayer can't archive

     // a pattern-based CGColor. So as a workaround, clear the background before archiving,

     // then restore it afterwards.

     // Also, archiving a CALayer with an image in it leaks memory. (Filed as rdar://5786865 )

     // As a workaround, clear the contents before archiving, then restore.

     CGColorRef bg = CGColorRetain(self.backgroundColor);

     self.backgroundColor = NULL;

     id contents = [self.contents retain];

     self.contents = nil;

     NSData *data = [NSKeyedArchiver archivedDataWithRootObject: self];

     self.backgroundColor = bg;

     self.contents = contents;

     Bit *clone = [NSKeyedUnarchiver unarchiveObjectWithData: data];

     clone.backgroundColor = bg;

     clone.contents = contents;

     CGColorRelease(bg);

     [contents release];

     clone->_owner = _owner;             // _owner is not archived

     return [clone retain];

 }

 - (NSString*) description

 {

     return [NSString stringWithFormat: @"%@[(%g,%g)]", self.class,self.position.x,self.position.y];

 }

 @synthesize owner=_owner;

 - (BOOL) isFriendly         {return _owner.friendly;}

 - (BOOL) isUnfriendly       {return _owner.unfriendly;}

 - (CGFloat) scale

 {

     NSNumber *scale = [self valueForKeyPath: @"transform.scale"];

     return scale.floatValue;

 }

 - (void) setScale: (CGFloat)scale

 {

     [self setValue: [NSNumber numberWithFloat: scale]

         forKeyPath: @"transform.scale"];

 }

 - (int) rotation

 {

     NSNumber *rot = [self valueForKeyPath: @"transform.rotation"];

     return round( rot.doubleValue * 180.0 / M_PI );

 }

 - (void) setRotation: (int)rotation

 {

     [self setValue: [NSNumber numberWithDouble: rotation*M_PI/180.0]

         forKeyPath: @"transform.rotation"];

 }

 - (BOOL) pickedUp

 {

     return self.zPosition >= kPickedUpZ;

 }

 - (void) setPickedUp: (BOOL)up

 {

     if( up != self.pickedUp ) {

         CGFloat shadow, offset, radius, opacity, z, scale;

         if( up ) {

             shadow = 0.8;

             offset = 2;

             radius = 8;

             opacity = 0.9;

             scale = 1.2;

             z = kPickedUpZ;

             _restingZ = self.zPosition;

         } else {

             shadow = offset = radius = 0.0;

             opacity = 1.0;

             scale = 1.0/1.2;

             z = _restingZ;

         }

         self.zPosition = z;

         self.shadowOpacity = shadow;

         self.shadowOffset = CGSizeMake(offset,-offset);

         self.shadowRadius = radius;

         self.opacity = opacity;

         self.scale *= scale;

     }

 }

 - (BOOL)containsPoint:(CGPoint)p

 {

     // Make picked-up pieces invisible to hit-testing.

     // Otherwise, while dragging a Bit, hit-testing the cursor position would always return

     // that Bit, since it's directly under the cursor...

     if( self.pickedUp )

         return NO;

     else

         return [super containsPoint: p];

 }

 -(id<BitHolder>) holder

 {

     // Look for my nearest ancestor that's a BitHolder:

     for( CALayer *layer=self.superlayer; layer; layer=layer.superlayer ) {

         if( [layer conformsToProtocol: @protocol(BitHolder)] )

             return (id<BitHolder>)layer;

         else if( [layer isKindOfClass: [Bit class]] )

             return nil;

     }

     return nil;

 }

 - (void) destroy

 {

     // "Pop" the Bit by expanding it 5x as it fades away:

     self.scale = 5;

     self.opacity = 0.0;

     // Removing the view from its superlayer right now would cancel the animations.

     // Instead, defer the removal until sometime shortly after the animations finish:

     [self performSelector: @selector(removeFromSuperlayer) withObject: nil afterDelay: 1.0];

 }

 @end