/*

File: Bit.m

Abstract: A moveable item in a card/board game.

Version: 1.0

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*/

#import "Bit.h"

#import "Game.h"

#import "QuartzUtils.h"

/**  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 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.

    CGColorRef bg = CGColorRetain(self.backgroundColor);

    self.backgroundColor = NULL;

    NSData *data = [NSKeyedArchiver archivedDataWithRootObject: self];

    self.backgroundColor = bg;

    Bit *clone = [NSKeyedUnarchiver unarchiveObjectWithData: data];

    clone.backgroundColor = bg;

    CGColorRelease(bg);

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

    return clone;

}

- (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