/* Copyright (c) 2014-present, Facebook, Inc.

* All rights reserved.

*

* This source code is licensed under the BSD-style license found in the

* LICENSE file in the root directory of this source tree. An additional grant

* of patent rights can be found in the PATENTS file in the same directory.

*/

#import "ASMapNode.h"

#import <AsyncDisplayKit/ASInsetLayoutSpec.h>

#import <AsyncDisplayKit/ASCenterLayoutSpec.h>

#import <AsyncDisplayKit/ASThread.h>

@interface ASMapNode()

{

ASDN::RecursiveMutex _propertyLock;

MKMapSnapshotter *_snapshotter;

MKMapSnapshotOptions *_options;

NSArray *_annotations;

CLLocationCoordinate2D _centerCoordinateOfMap;

}

@end

@implementation ASMapNode

@synthesize needsMapReloadOnBoundsChange = _needsMapReloadOnBoundsChange;

@synthesize mapDelegate = _mapDelegate;

@synthesize region = _region;

@synthesize liveMap = _liveMap;

#pragma mark - Lifecycle

- (instancetype)init

{

if (!(self = [super init])) {

return nil;

}

self.backgroundColor = ASDisplayNodeDefaultPlaceholderColor();

self.clipsToBounds = YES;

_needsMapReloadOnBoundsChange = YES;

_liveMap = NO;

_centerCoordinateOfMap = kCLLocationCoordinate2DInvalid;

//Default world-scale view

_region = MKCoordinateRegionForMapRect(MKMapRectWorld);

_options = [[MKMapSnapshotOptions alloc] init];

_options.region = _region;

return self;

}

- (void)didLoad

{

[super didLoad];

if (self.isLiveMap) {

self.userInteractionEnabled = YES;

[self addLiveMap];

}

}

- (void)setLayerBacked:(BOOL)layerBacked

{

ASDisplayNodeAssert(!self.isLiveMap, @"ASMapNode can not be layer backed whilst .liveMap = YES, set .liveMap = NO to use layer backing.");

[super setLayerBacked:layerBacked];

}

- (void)fetchData

{

[super fetchData];

if (self.isLiveMap) {

[self addLiveMap];

} else {

[self takeSnapshot];

}

}

- (void)clearContents

{

[super clearContents];

if (self.isLiveMap) {

[self removeLiveMap];

}

}

#pragma mark - Settings

- (BOOL)isLiveMap

{

ASDN::MutexLocker l(_propertyLock);

return _liveMap;

}

- (void)setLiveMap:(BOOL)liveMap

{

ASDisplayNodeAssert(!self.isLayerBacked, @"ASMapNode can not use the interactive map feature whilst .isLayerBacked = YES, set .layerBacked = NO to use the interactive map feature.");

ASDN::MutexLocker l(_propertyLock);

if (liveMap == _liveMap) {

return;

}

_liveMap = liveMap;

if (self.nodeLoaded) {

liveMap ? [self addLiveMap] : [self removeLiveMap];

}

}

- (BOOL)needsMapReloadOnBoundsChange

{

ASDN::MutexLocker l(_propertyLock);

return _needsMapReloadOnBoundsChange;

}

- (void)setNeedsMapReloadOnBoundsChange:(BOOL)needsMapReloadOnBoundsChange

{

ASDN::MutexLocker l(_propertyLock);

_needsMapReloadOnBoundsChange = needsMapReloadOnBoundsChange;

}

- (MKCoordinateRegion)region

{

ASDN::MutexLocker l(_propertyLock);

return _region;

}

- (void)setRegion:(MKCoordinateRegion)region

{

ASDN::MutexLocker l(_propertyLock);

_region = region;

if (self.isLiveMap) {

[_mapView setRegion:_region animated:YES];

} else {

_options.region = _region;

[self resetSnapshotter];

[self takeSnapshot];

}

}

#pragma mark - Snapshotter

- (void)takeSnapshot

{

if (!_snapshotter) {

[self setUpSnapshotter];

}

[_snapshotter cancel];

[_snapshotter startWithCompletionHandler:^(MKMapSnapshot *snapshot, NSError *error) {

if (!error) {

UIImage *image = snapshot.image;

CGRect finalImageRect = CGRectMake(0, 0, image.size.width, image.size.height);

UIGraphicsBeginImageContextWithOptions(image.size, YES, image.scale);

[image drawAtPoint:CGPointMake(0, 0)];

if (_annotations.count > 0 ) {

// Get a standard annotation view pin. Future implementations should use a custom annotation image property.

MKAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:nil reuseIdentifier:@""];

UIImage *pinImage = pin.image;

for (id<MKAnnotation>annotation in _annotations)

{

CGPoint point = [snapshot pointForCoordinate:annotation.coordinate];

if (CGRectContainsPoint(finalImageRect, point))

{

CGPoint pinCenterOffset = pin.centerOffset;

point.x -= pin.bounds.size.width / 2.0;

point.y -= pin.bounds.size.height / 2.0;

point.x += pinCenterOffset.x;

point.y += pinCenterOffset.y;

[pinImage drawAtPoint:point];

}

}

}

UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

self.image = finalImage;

}

}];

}

- (void)setUpSnapshotter

{

ASDisplayNodeAssert(!CGSizeEqualToSize(CGSizeZero, self.calculatedSize), @"self.calculatedSize can not be zero. Make sure that you are setting a preferredFrameSize or wrapping ASMapNode in a ASRatioLayoutSpec or similar.");

_options.size = self.calculatedSize;

_snapshotter = [[MKMapSnapshotter alloc] initWithOptions:_options];

}

- (void)resetSnapshotter

{

[_snapshotter cancel];

_snapshotter = [[MKMapSnapshotter alloc] initWithOptions:_options];

}

#pragma mark - Actions

- (void)addLiveMap

{

ASDisplayNodeAssertMainThread();

if (!_mapView) {

__weak ASMapNode *weakSelf = self;

_mapView = [[MKMapView alloc] initWithFrame:CGRectZero];

_mapView.delegate = weakSelf.mapDelegate;

[_mapView setRegion:_options.region];

[_mapView addAnnotations:_annotations];

[weakSelf setNeedsLayout];

[weakSelf.view addSubview:_mapView];

if (CLLocationCoordinate2DIsValid(_centerCoordinateOfMap)) {

[_mapView setCenterCoordinate:_centerCoordinateOfMap];

}

}

}

- (void)removeLiveMap

{

_centerCoordinateOfMap = _mapView.centerCoordinate;

[_mapView removeFromSuperview];

_mapView = nil;

}

- (void)setAnnotations:(NSArray *)annotations

{

ASDN::MutexLocker l(_propertyLock);

_annotations = [annotations copy];

if (self.isLiveMap) {

[_mapView removeAnnotations:_mapView.annotations];

[_mapView addAnnotations:annotations];

} else {

[self takeSnapshot];

}

}

#pragma mark - Layout

// Layout isn't usually needed in the box model, but since we are making use of MKMapView which is hidden in an ASDisplayNode this is preferred.

- (void)layout

{

[super layout];

if (self.isLiveMap) {

_mapView.frame = CGRectMake(0.0f, 0.0f, self.calculatedSize.width, self.calculatedSize.height);

} else {

// If our bounds.size is different from our current snapshot size, then let's request a new image from MKMapSnapshotter.

if (!CGSizeEqualToSize(_options.size, self.bounds.size) && _needsMapReloadOnBoundsChange) {

_options.size = self.bounds.size;

[self resetSnapshotter];

[self takeSnapshot];

}

}

}

@end