eqn.ios/Sources/EQNNotificationContent/NotificationViewController.m

//
//  NotificationViewController.m
//  EQNNotificationContent
//
//  Refactored by Andrea Busi on 14/10/2020.
//  Copyright © 2020 Earthquake Network. All rights reserved.
//

#import "NotificationViewController.h"
#import "PastquakesAnnotation.h"
#import "ReteSismicaAnnotation.h"
#import "EQNUtility.h"

@import UserNotifications;
@import UserNotificationsUI;
@import MapKit;

@interface NotificationViewController () <UNNotificationContentExtension, MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet UILabel *titleLabel;
@property (weak, nonatomic) IBOutlet UILabel *descriptionLabel;
@property (weak, nonatomic) IBOutlet UILabel *waveLabel;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;

/// This will be calculated as seismic date + warning time
@property (strong, nonatomic) NSDate *userSeismicTimestamp;
@property (strong, nonatomic) NSTimer *countdownTimer;
@end

@implementation NotificationViewController

- (void)setMapView:(MKMapView *)mapView
{
    _mapView = mapView;
    _mapView.scrollEnabled = NO;
    _mapView.zoomEnabled = NO;
}

#pragma mark - View Lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any required interface initialization here.
}

- (void)didReceiveNotification:(UNNotification *)notification
{
    UNNotificationContent *content = notification.request.content;
    NSDictionary *userInfo = content.userInfo;
    
    // set title and description
    self.titleLabel.text = content.title;
    self.descriptionLabel.text = content.body;
    
    // add annotation onthe map
    CLLocation *coordinate = [[CLLocation alloc] initWithLatitude:[userInfo[@"latitude"] doubleValue]
                                                        longitude:[userInfo[@"longitude"] doubleValue]];
    MKCoordinateSpan span = MKCoordinateSpanMake(10.5, 10.5);
    MKCoordinateRegion region = MKCoordinateRegionMake(coordinate.coordinate, span);
    [self.mapView setCenterCoordinate:coordinate.coordinate animated:NO];
    [self.mapView setRegion:region animated:YES];
    
    if ([userInfo[@"type"] isEqualToString:@"eqn"]) {
        PastquakesAnnotation *annotation = [[PastquakesAnnotation alloc] initWithTitle:content.body
                                                                              location:coordinate.coordinate
                                                                             intensita:[userInfo[@"intensity"] intValue]];
        [self.mapView addAnnotation:annotation];
    
    } else if ([userInfo[@"type"] isEqualToString:@"manual"]){
        ReteSismicaAnnotation *annotation = [[ReteSismicaAnnotation alloc] initWithTitle:content.body
                                                                                location:coordinate.coordinate
                                                                               magnitudo:[userInfo[@"magnitudo"] intValue]];
        [self.mapView addAnnotation:annotation];
    }


    self.userSeismicTimestamp = [self calculateUserSeismicTimestampWithInfo:userInfo];
    if (self.userSeismicTimestamp) {
        // start the countdown
        self.countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                                               target:self
                                                             selector:@selector(countdownFired:)
                                                             userInfo:nil
                                                              repeats:YES];
        [self.countdownTimer fire];
    }
}

#pragma mark - Private

- (nullable NSDate *)calculateUserSeismicTimestampWithInfo:(NSDictionary *)info
{
    // dobbiamo calcolare l'ora in cui il sisma arriverà nella posizione dell'utente
    // per fare questo, il calcolo sarà:
    // timestamp sisma + warning time
    
    // ultima posizione nota dell'utente
    CLLocationManager *manager = [[CLLocationManager alloc] init];
    CLLocation *lastUserLocation = manager.location;
    if (!lastUserLocation) {
        return nil;
    }
    
    // posizione sisma
    double latitude = [info[@"latitude"] doubleValue];
    double longitude = [info[@"longitude"] doubleValue];
    CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
    
    // distanza tra sisma e utente (in km)
    CLLocationDistance distance = [lastUserLocation distanceFromLocation:location];
    double userDistance = distance/1000;
    
    // calcoliamo warning_time
    double waveSpeed = [info[@"wave_speed"] doubleValue];
    double warningTime = round(userDistance/waveSpeed - 5);
    
    // aggiungiamo il warning time al timestamp del sisma
    NSDate *seismicDate = [EQNUtility getDateFromString:info[@"datetime"]];
    NSDate *userSeismicDate = [seismicDate dateByAddingTimeInterval:warningTime];
    
    return userSeismicDate;
}

- (void)countdownFired:(id)sender
{
    NSDate *now = [NSDate date];
    NSTimeInterval difference = MAX([self.userSeismicTimestamp timeIntervalSinceDate:now], 0);
    
    self.waveLabel.text = [NSString stringWithFormat:@"%@ %.0f %@", NSLocalizedString(@"alert_wave", @""), difference,  NSLocalizedString(@"alert_seconds", @"")];
    
    if (difference <= 0) {
        // stop the countdown
        [self.countdownTimer invalidate];
        self.countdownTimer = nil;
    }
}

#pragma mark - MKMapViewDelegate

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    if ([annotation isKindOfClass:[PastquakesAnnotation class]]) {
        PastquakesAnnotation *anLocation = (PastquakesAnnotation *)annotation;
        MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:IDENTIFIER_ANNOTATION_PASTQUAKES];
        if (annotationView == nil) {
            annotationView = anLocation.annotationView;
        } else {
            annotationView.annotation = anLocation;
        }
        return annotationView;
    
    } else if ([annotation isKindOfClass:[ReteSismicaAnnotation class]]) {
        ReteSismicaAnnotation *anLocation = (ReteSismicaAnnotation *)annotation;
        MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:IDENTIFIER_ANNOTATION_RETESMARTPHONE];
        if (annotationView == nil) {
            annotationView = anLocation.annotationView;
        } else {
            annotationView.annotation = anLocation;
        }
        return annotationView;
    }
    return nil;
}

@end