#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif

#import "GoogleMapsDemos/Samples/IndoorMuseumNavigationViewController.h"

@implementation IndoorMuseumNavigationViewController {
  GMSMapView *_mapView;
  NSArray *_exhibits;     // Array of JSON exhibit data.
  NSDictionary *_exhibit; // The currently selected exhibit. Will be nil initially.
  GMSMarker *_marker;
  NSDictionary *_levels;  // The levels dictionary is updated when a new building is selected, and
                          // contains mapping from localized level name to GMSIndoorLevel.
}

- (void)viewDidLoad {
  [super viewDidLoad];

  GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:38.8879
                                                          longitude:-77.0200
                                                               zoom:17];
  _mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
  _mapView.settings.myLocationButton = NO;
  _mapView.settings.indoorPicker = NO;
  _mapView.delegate = self;
  _mapView.indoorDisplay.delegate = self;

  self.view = _mapView;

  // Load the exhibits configuration from JSON
  NSString *jsonPath = [[NSBundle mainBundle] pathForResource:@"museum-exhibits" ofType:@"json"];
  NSData *data = [NSData dataWithContentsOfFile:jsonPath];
  _exhibits = [NSJSONSerialization JSONObjectWithData:data
                                              options:kNilOptions
                                                error:nil];


  UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] init];
  [segmentedControl setTintColor:[UIColor colorWithRed:0.373f green:0.667f blue:0.882f alpha:1.0f]];

  segmentedControl.translatesAutoresizingMaskIntoConstraints = NO;
  [segmentedControl addTarget:self
                       action:@selector(exhibitSelected:)
             forControlEvents:UIControlEventValueChanged];
  [self.view addSubview:segmentedControl];

  for (NSDictionary *exhibit in _exhibits) {
    [segmentedControl insertSegmentWithImage:[UIImage imageNamed:exhibit[@"key"]]
                                     atIndex:[_exhibits indexOfObject:exhibit]
                                    animated:NO];
  }

  NSDictionary *views = NSDictionaryOfVariableBindings(segmentedControl);

  [self.view addConstraints:[NSLayoutConstraint
                             constraintsWithVisualFormat:@"[segmentedControl]-|"
                             options:kNilOptions
                             metrics:nil
                             views:views]];
  [self.view addConstraints:[NSLayoutConstraint
                             constraintsWithVisualFormat:@"V:[segmentedControl]-|"
                             options:kNilOptions
                             metrics:nil
                             views:views]];

}

- (void)moveMarker {
  CLLocationCoordinate2D loc = CLLocationCoordinate2DMake([_exhibit[@"lat"] doubleValue],
                                                          [_exhibit[@"lng"] doubleValue]);
  if (_marker == nil) {
    _marker = [GMSMarker markerWithPosition:loc];
    _marker.map = _mapView;
  } else {
    _marker.position = loc;
  }
  _marker.title = _exhibit[@"name"];
  [_mapView animateToLocation:loc];
  [_mapView animateToZoom:19];
}

- (void)exhibitSelected:(UISegmentedControl *)segmentedControl {
  _exhibit = _exhibits[[segmentedControl selectedSegmentIndex]];
  [self moveMarker];
}

#pragma mark - GMSMapViewDelegate

- (void)mapView:(GMSMapView *)mapView idleAtCameraPosition:(GMSCameraPosition *)camera {
  if (_exhibit != nil) {
    CLLocationCoordinate2D loc = CLLocationCoordinate2DMake([_exhibit[@"lat"] doubleValue],
                                                            [_exhibit[@"lng"] doubleValue]);
    if ([_mapView.projection containsCoordinate:loc] && _levels != nil) {
      [mapView.indoorDisplay setActiveLevel:_levels[_exhibit[@"level"]]];
    }
  }
}

#pragma mark - GMSIndoorDisplayDelegate

- (void)didChangeActiveBuilding:(GMSIndoorBuilding *)building {
  if (building != nil) {
    NSMutableDictionary *levels = [NSMutableDictionary dictionary];

    for (GMSIndoorLevel *level in building.levels) {
      [levels setObject:level forKey:level.shortName];
    }

    _levels = [NSDictionary dictionaryWithDictionary:levels];
  } else {
    _levels = nil;
  }
}

@end