//
//  RMMapOverlayView.m
//  MapView
//
//  Created by Thomas Rasch on 25.08.11.
//  Copyright (c) 2011 Alpstein. All rights reserved.
//

#import "RMMapOverlayView.h"
#import "RMMarker.h"
#import "RMAnnotation.h"
#import "RMPixel.h"
#import "RMMapView.h"
#import "RMUserLocation.h"

@implementation RMMapOverlayView

+ (Class)layerClass
{
    return [CAScrollLayer class];
}

- (id)initWithFrame:(CGRect)frame
{
    if (!(self = [super initWithFrame:frame]))
        return nil;

    self.layer.masksToBounds = NO;

    return self;
}

- (unsigned)sublayersCount
{
    return [self.layer.sublayers count];
}

- (void)addSublayer:(CALayer *)aLayer
{
    [self.layer addSublayer:aLayer];
}

- (void)insertSublayer:(CALayer *)aLayer atIndex:(unsigned)index
{
    [self.layer insertSublayer:aLayer atIndex:index];
}

- (void)insertSublayer:(CALayer *)aLayer below:(CALayer *)sublayer
{
    [self.layer insertSublayer:aLayer below:sublayer];
}

- (void)insertSublayer:(CALayer *)aLayer above:(CALayer *)sublayer
{
    [self.layer insertSublayer:aLayer above:sublayer];
}

- (void)moveLayersBy:(CGPoint)delta
{
    [self.layer scrollPoint:CGPointMake(-delta.x, -delta.y)];
}

- (CALayer *)overlayHitTest:(CGPoint)point
{
    RMMapView *mapView = ((RMMapView *)self.superview);

    // Here we be sure to hide disabled but visible annotations' layers to
    // avoid touch events, then re-enable them after scoring the hit. We
    // also show the user location if enabled and we're in tracking mode,
    // since its layer is hidden and we want a possible hit. 
    //
    NSPredicate *annotationPredicate = [NSPredicate predicateWithFormat:@"SELF.enabled = NO AND SELF.layer != %@ AND SELF.layer.isHidden = NO", [NSNull null]];

    NSArray *disabledVisibleAnnotations = [mapView.annotations filteredArrayUsingPredicate:annotationPredicate];

    for (RMAnnotation *annotation in disabledVisibleAnnotations)
        annotation.layer.hidden = YES;

    if (mapView.userLocation.enabled && mapView.userTrackingMode == RMUserTrackingModeFollowWithHeading)
        mapView.userLocation.layer.hidden = NO;

    CALayer *hit = [self.layer hitTest:point];

    if (mapView.userLocation.enabled && mapView.userTrackingMode == RMUserTrackingModeFollowWithHeading)
        mapView.userLocation.layer.hidden = YES;

    for (RMAnnotation *annotation in disabledVisibleAnnotations)
        annotation.layer.hidden = NO;

    return hit;
}

@end