/*
* Copyright 2016 Google LLC. All rights reserved.
*
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
* file except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under
* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
* ANY KIND, either express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/

#import "GoogleMapsDemos/Samples/PolylinesViewController.h"

#import <GoogleMaps/GoogleMaps.h>

@interface GMSPolyline (length)

@property(nonatomic, readonly) double length;

@end

@implementation GMSPolyline (length)

- (double)length {
GMSLengthKind kind = [self geodesic] ? kGMSLengthGeodesic : kGMSLengthRhumb;
return [[self path] lengthOfKind:kind];
}

@end

static CLLocationCoordinate2D kSydneyAustralia = {-33.866901, 151.195988};
static CLLocationCoordinate2D kHawaiiUSA = {21.291982, -157.821856};
static CLLocationCoordinate2D kFiji = {-18, 179};
static CLLocationCoordinate2D kMountainViewUSA = {37.423802, -122.091859};
static CLLocationCoordinate2D kLimaPeru = {-12, -77};
static bool kAnimate = true;

@implementation PolylinesViewController {
NSArray *_styles;
NSArray *_lengths;
NSArray *_polys;
double _pos, _step;
GMSMapView *_mapView;
}

- (void)tick {
for (GMSPolyline *poly in _polys) {
poly.spans = GMSStyleSpansOffset(poly.path, _styles, _lengths, kGMSLengthGeodesic, _pos);
}
_pos -= _step;
if (kAnimate) {
__weak id weakSelf = self;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC / 10), dispatch_get_main_queue(),
^{
[weakSelf tick];
});
}
}

- (void)initLines {
if (!_polys) {
NSMutableArray *polys = [NSMutableArray array];
GMSMutablePath *path = [GMSMutablePath path];
[path addCoordinate:kSydneyAustralia];
[path addCoordinate:kFiji];
[path addCoordinate:kHawaiiUSA];
[path addCoordinate:kMountainViewUSA];
[path addCoordinate:kLimaPeru];
[path addCoordinate:kSydneyAustralia];
path = [path pathOffsetByLatitude:-30 longitude:0];
_lengths = @[ @([path lengthOfKind:kGMSLengthGeodesic] / 21) ];
for (int i = 0; i < 30; ++i) {
GMSPolyline *poly = [[GMSPolyline alloc] init];
poly.path = [path pathOffsetByLatitude:(i * 1.5) longitude:0];
poly.strokeWidth = 8;
poly.geodesic = YES;
poly.map = _mapView;
[polys addObject:poly];
}
_polys = polys;
}
}

- (void)viewDidLoad {
[super viewDidLoad];
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-30 longitude:-175 zoom:3];
GMSMapView *mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView.accessibilityElementsHidden = YES;
self.view = mapView;
_mapView = mapView;

CGFloat alpha = 1;
UIColor *green = [UIColor colorWithRed:0 green:1 blue:0 alpha:alpha];
UIColor *greenTransp = [UIColor colorWithRed:0 green:1 blue:0 alpha:0];
UIColor *red = [UIColor colorWithRed:1 green:0 blue:0 alpha:alpha];
UIColor *redTransp = [UIColor colorWithRed:1 green:0 blue:0 alpha:0];
GMSStrokeStyle *grad1 = [GMSStrokeStyle gradientFromColor:green toColor:greenTransp];
GMSStrokeStyle *grad2 = [GMSStrokeStyle gradientFromColor:redTransp toColor:red];
_styles = @[
grad1,
grad2,
[GMSStrokeStyle solidColor:[UIColor colorWithWhite:0 alpha:0]],
];
_step = 50000;
[self initLines];
[self tick];
}

@end