Andrea Busi
93 lines
2.9 KiB
Swift
93 lines
2.9 KiB
Swift
//
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// EQNRealtimeAlert.swift
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// Earthquake Network
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//
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// Created by Andrea Busi on 17/06/22.
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// Copyright © 2022 Earthquake Network. All rights reserved.
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//
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import Foundation
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import CoreLocation
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import Shogun
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@objc
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class EQNRealtimeAlert: NSObject {
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typealias NotificationPayload = [String: Any]
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/// Title to display
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var title: String = ""
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/// Earthquake coordinate
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let coordinate: CLLocation
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/// Earthquake intensity
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let intensity: Int
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/// Earthquake wave speed
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let waveSpeed: Double
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/// Calculated timestamp for earthquake on user position
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let impactTimestamp: Date
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// MARK: - Init
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@objc
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init?(notification: [String: Any]) {
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guard let alert = Self.getPushAlertPayload(from: notification),
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let coordinate = Self.getCoordinate(from: notification),
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let impactTimestamp = EQNUtility.calculateUserSeismicTimestamp(fromUserInfo: notification) else {
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return nil
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}
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self.coordinate = coordinate
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self.impactTimestamp = impactTimestamp
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if let title = alert["loc-key"] as? String, let args = alert["loc-args"] as? [String], let arg = args.first {
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self.title = String(format: NSLocalizedString(title, comment: ""), arg)
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}
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self.intensity = notification.integer(forKey: "intensity", orDefault: 0)
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self.waveSpeed = notification.double(forKey: "wave_speed", orDefault: 0.0) * 1000 // m/s
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}
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func distanceFromUser() -> CLLocationDistance {
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EQNUser.default().lastPosition?.distance(from: coordinate) ?? 0.0
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}
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/// Remaining time before earthquake gets user position
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func currentCountdown() -> Int {
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let now = Date()
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let difference = lround(max(impactTimestamp.timeIntervalSince(now), 0))
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return difference
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}
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@objc
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func isCountdownExpired() -> Bool {
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currentCountdown() <= 0
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}
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// MARK: - Helpers
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/// Get `aps.alert` object inside a given notification payload
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/// - Parameter notification: Notification payload
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/// - Returns: `aps.alert` object if found, nil otherwise
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static func getPushAlertPayload(
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from notification: NotificationPayload
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) -> NotificationPayload? {
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guard let aps = notification["aps"] as? [String: Any],
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let alert = aps["alert"] as? [String: Any] else {
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return nil
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}
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return alert
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}
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/// Retrieve coordinate of earthquake from the notification payload
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/// - Parameter notification: Notification payload
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/// - Returns: Coordinate if found, nil otherwise
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static func getCoordinate(
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from notification: NotificationPayload
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) -> CLLocation? {
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guard let latitude = notification.double(forKey: "latitude"),
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let longitude = notification.double(forKey: "longitude") else {
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return nil
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}
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return CLLocation(latitude: latitude, longitude: longitude)
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}
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}
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