eqn.ios/Sources/Earthquake Network/Models/EQNOfficialPushNotification.swift

//
//  EQNOfficialPushNotification.swift
//  Earthquake Network
//
//  Created by Andrea Busi on 29/06/24.
//  Copyright © 2024 Earthquake Network. All rights reserved.
//

import Foundation
import Shogun


@objc
class EQNOfficialPushNotification: NSObject, Codable {
    
    private enum CodingKeys: String, CodingKey {
        case latitude
        case longitude
        case magnitude
        case date
    }
    
    private let latitude: Double
    private let longitude: Double
    let magnitude: Double
    let date: Date?
    
    var coordinate: CLLocation {
        .init(latitude: latitude, longitude: longitude)
    }
    
    // MARK: - Init
    
    init(
        latitude: Double,
        longitude: Double,
        magnitude: Double,
        date: Date?
    ) {
        self.latitude = latitude
        self.longitude = longitude
        self.magnitude = magnitude
        self.date = date
    }
    
    // MARK: - Class
    
    /// Remove any saved notification
    static func removeStored() {
        UserDefaults.standard.removeObject(forKey: UserDefaults.OfficialAlertPayload)
    }
    
    /// Retrieve stored notification (if any)
    static func stored() -> EQNOfficialPushNotification? {
        guard let data = UserDefaults.standard.object(forKey: UserDefaults.OfficialAlertPayload) as? Data else {
            print("[EQNOfficialPushNotification] No notification saved for key '\(UserDefaults.OfficialAlertPayload)'")
            return nil
        }
        
        guard let notification = try? JSONDecoder().decode(EQNOfficialPushNotification.self, from: data) else {
            print("[EQNOfficialPushNotification] Unable to decode given notification")
            return nil
        }
        
        return notification
    }
    
    /// Convert and store a push notification payload.
    /// Expected payload has the following structure:
    /// ```
    /// {
    ///     "title": "Segnalazione da rete sismica",
    ///     "body": "Sisma rilevato a 4km S Valfabbrica (PG)",
    ///     "userInfo": {
    ///         "data" : "2024-06-29 11:21:30",
    ///         ...
    ///         "aps": {
    ///             "alert" : {
    ///                 "loc-key" : "Sisma rilevato a",
    ///                 "title-loc-key" : "Segnalazione da rete sismica",
    ///                 "title" : "Segnalazione da rete sismica",
    ///                 "action-loc-key" : "",
    ///                 "loc-args" : [
    ///                     "6 km S Acate (RG) - M1.9"
    ///                 ]
    ///             },
    ///         }
    ///     }
    /// }
    /// ```
    /// - Parameter payload: Notification payload
    /// - Returns: `true` if save succeed, `false` otherwise
    @objc(storeNotificationWithPayload:)
    @discardableResult
    static func store(payload: [String: Any]) -> Bool {
        guard let notification = from(payload: payload) else {
            print("[EQNOfficialPushNotification] Unable to convert received notification")
            return false
        }
        
        guard let data = try? JSONEncoder().encode(notification) else {
            print("[EQNOfficialPushNotification] Unable to encode given notification")
            return false
        }

        UserDefaults.standard.set(data, forKey: UserDefaults.OfficialAlertPayload)
        return true
    }
    
    @objc
    private static func from(payload: [String: Any]) -> EQNOfficialPushNotification? {
        guard let userInfo = payload["userInfo"] as? [String: Any] else {
            print("[EQNOfficialPushNotification] Missing required info to parse push notification")
            return nil
        }
        
        let latitude = userInfo.double(forKey: "latitude") ?? 0
        let longitude = userInfo.double(forKey: "longitude") ?? 0
        let magnitude = userInfo.double(forKey: "magnitude") ?? 0
        let dateString = userInfo.string(forKey: "data") ?? ""
        let date = EQNUtility.getDateFrom(dateString)
        
        return .init(
            latitude: latitude,
            longitude: longitude,
            magnitude: magnitude,
            date: date
        )
    }
}