#import "WKFlipsView.h"

#import "WKFlipPageView.h"

@interface TestImagePageView : WKFlipPageView{
    
}
@property (nonatomic,retain) UIImageView* testImageView;
@end

#import "TestImagePageView.h"

@implementation TestImagePageView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}
-(id)init{
    self=[super init];
    if (self){

    }
    return self;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/
-(void)dealloc{
    [_testImageView release];
    [super dealloc];
}
-(void)prepareForReuse{
    if (!_testImageView){
        _testImageView=[[UIImageView alloc]initWithFrame:self.bounds];
        [self addSubview:_testImageView];
    }
    for (UIView* view in self.subviews) {
        if (view!=_testImageView){
            [view removeFromSuperview];
        }
    }
}
@end

if (!_flipsView){
    _flipsView=[[WKFlipsView alloc]initWithFrame:self.view.bounds atPageIndex:1 withCacheIdentity:@"test"];
    _flipsView.backgroundColor=[UIColor darkGrayColor];
    _flipsView.dataSource=self;
    _flipsView.delegate=self;
    [_flipsView registerClass:[TestImagePageView class] forPageWithReuseIdentifier:@"page"];
    [self.view addSubview:_flipsView];

}
[_flipsView reloadPages];

	///从一个文件中载入一堆图片
	-(void)testPrepareImages{
	    if (!_images){
	        _images=[[NSMutableArray alloc]init];
	    }
	    [_images removeAllObjects];
	    NSString* filename=[NSString stringWithFormat:@"%@/test.images",WKFLIPS_PATH_DOCUMENT];
	    if ([[NSFileManager defaultManager] fileExistsAtPath:filename]){
	        NSLog(@"load test images");
	        NSString* string=[NSString stringWithContentsOfFile:filename encoding:NSUTF8StringEncoding error:NULL];
	        NSArray* array=[string componentsSeparatedByString:@"\n"];
	        [_images addObjectsFromArray:array];
	        NSMutableArray* delete_array=[NSMutableArray array];
	        for (NSString* one_image in _images) {
	            if (!one_image || [one_image isEqualToString:@""]){
	                [delete_array addObject:one_image];
	            }
	        }
	        [_images removeObjectsInArray:delete_array];
	    }
	    else{
	        NSLog(@"new images");
	        for (int a=0; a<23; a++) {
	            [_images addObject:[NSString stringWithFormat:@"%d.png",a]];
	        }
	        [self testWriteImages];
	    }
	}

- UIView 
	- WKFlipsView
		- UIView (currentPageView) #下层是真正显示的内容
			- WKFlipPageView (currentFlipPageView)
		- WKFlipsLayerView (flippingLayersView) #上层是用来实现翻页的效果，翻页结束后隐藏
			- CALayer (layer)
				- WKFlipsLayer 
					- frontLayer
						- CALayer (_shaodwOnFrontLayer)
					- backLayer				
						- CALayer (_shadowOnBackLayer)
				- WKFlipsLayer
					- frontLayer
						- CALayer (_shaodwOnFrontLayer)
					- backLayer				
						- CALayer (_shadowOnBackLayer)
				- WKFlipsLayer
					- frontLayer
						- CALayer (_shaodwOnFrontLayer)
					- backLayer				
						- CALayer (_shadowOnBackLayer)	

上半部分
- WKFlipsLayer (layer on top, 181°)
- WKFlipsLayer (layer on top, 182°)
- WKFlipsLyaer (layer on top, 180°，可见)
--- 
下半部分
- WKFlipsLayer (layer on bottom, 0°,可见)
- WKFlipsLayer (layer on bottom, -1°)
- WKFlipsLayer (layer on bottom, -2°)

	///在允许的时间范围内为尽可能多的layer贴图,如果maxSeconds是0那就忽略时间
	///应该从当前页面两边优先贴图
	-(void)_pasteImagesToLayersForTargetPageIndex:(int)targetPageIndex inSeconds:(double)maxSeconds{
	    double startTime=CFAbsoluteTimeGetCurrent();
	    double duration=0;
	    int totalPages=(int)[self.flipsView.dataSource numberOfPagesForFlipsView:self.flipsView];
	    ///检查缓存索引键是否完全
	    for (int a=0; a<totalPages; a++) {
	        if (![self.flipsView.cache pageCacheAtPageIndex:a]){
	            [self.flipsView.cache addPage];
	        }
	    }
	    ///对贴图顺序进行排序
	    NSArray* sortedPages=[self _sortedPagesForTargetPageIndex:targetPageIndex];
	    ///统计贴图的页面数和跳过的页面数(WKFlipsLayer的正反面)
	    int numbersPastes=0,numbersSkips=0;
	    for(NSNumber* pageNumber in sortedPages) {
	        int pageIndex=[pageNumber intValue];
	        duration=CFAbsoluteTimeGetCurrent()-startTime;
	        ///超出设定时间了，跳过贴图
	        if (maxSeconds>0 && duration>=maxSeconds){
	            //NSLog(@"duration:%f",duration);
	            //break;
	            numbersSkips+=2;
	            continue;
	        }
	        int layerIndexForTop=totalPages-pageIndex;
	        int layerIndexForBottom=layerIndexForTop-1;
	        WKFlipsLayer* layerForTop=self.layer.sublayers[layerIndexForTop];
	        WKFlipsLayer* layerForBottom=self.layer.sublayers[layerIndexForBottom];
	        ///如果已经有贴图了就跳过
	        if (layerForTop.backLayer.contents && layerForBottom.frontLayer.contents){
	            numbersSkips+=2;
	            continue;
	        }
	        WKFlipPageView* page=[self.flipsView.dataSource flipsView:self.flipsView pageAtPageIndex:pageIndex];
	        WKFlipPageViewCache* pageCache=[self.flipsView.cache pageCacheAtPageIndex:pageIndex];
	        NSArray* images=nil;
	        if (!layerForTop.backLayer.contents){
	            ///没有缓存
	            if (!pageCache.topImage){
	                images=[page makeHSnapShotImages];
	                [pageCache setTopImage:images[0]];
	            }
	            layerForTop.backLayer.contents=(id)pageCache.topImage.CGImage;
	            numbersPastes+=1;
	            //NSLog(@"new image pasted");
	        }
	        else{
	            numbersSkips+=1;
	        }
	        if (!layerForBottom.frontLayer.contents){
	            if (!pageCache.bottomImage){
	                ///如果已经有截图了就不要重新创建了
	                if (!images){
	                    images=[page makeHSnapShotImages];
	                }
	                [pageCache setBottomImage:images[1]];
	            }
	            layerForBottom.frontLayer.contents=(id)pageCache.bottomImage.CGImage;
	            numbersPastes+=1;
	            //NSLog(@"new images pasted");
	        }
	        else{
	            numbersSkips+=1;
	        }
	        
	    }
	    duration=CFAbsoluteTimeGetCurrent()-startTime;
	    NSLog(@"pastes:%d,skips:%d,duration:%f",numbersPastes,numbersSkips,duration);
	}