eqn.ios/Sources/Earthquake Network/Controllers/Alerts/Cells/AlertsSeismicNotificationExpandedTableViewCell.swift

//
//  AlertsSeismicNotificationTableViewCell.swift
//  Earthquake Network
//
//  Created by Busi Andrea on 05/10/2020.
//  Copyright © 2020 Earthquake Network. All rights reserved.
//

import UIKit
import MapKit

class AlertsSeismicNotificationExpandedTableViewCell: EQNBaseTableViewCell, MKMapViewDelegate {

    typealias DefaultCompletion = () -> Void
    
    @objc var notification: [String: Any]? {
        didSet {
            startCountdown()
            updateUI()
        }
    }
    @objc var onTapOpenTwitter: DefaultCompletion?
    @objc var onTapRateApp: DefaultCompletion?
    @objc var onTapClose: DefaultCompletion?
    @objc var onTapShareApp: DefaultCompletion?
    
    
    // MARK: - Internal
    
    @IBOutlet weak var notificationTitleLabel: UILabel!
    @IBOutlet weak var notificationDescriptionLabel: UILabel!
    @IBOutlet weak var waveTimeLabel: UILabel!
    @IBOutlet weak var mapView: MKMapView! {
        didSet {
            mapView.delegate = self
            mapView.isScrollEnabled = false
            mapView.isZoomEnabled = false
            mapView.register(EQNCustomAnnotationView.self, forAnnotationViewWithReuseIdentifier: EQNCustomAnnotationView.Identifier)
        }
    }
    private var impactTimestamp: Date?
    private var countdownTimer: Timer?
    
    // MARK: - Private
    
    private func startCountdown() {
        guard let notification = notification else { return }
        
        // calculate the impact timestamp and start a timer for the countdown label
        if let impactTimestamp = EQNUtility.calculateUserSeismicTimestamp(fromUserInfo: notification) {
            self.impactTimestamp = impactTimestamp
            countdownTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(countdownTimerFired(_:)), userInfo: nil, repeats: true)
            countdownTimer?.fire()
        }
    }
    
    private func updateUI() {
        notificationTitleLabel.text = ""
        notificationDescriptionLabel.text = ""
        
        guard let notification = notification,
              let aps = notification["aps"] as? [String: Any],
              let alert = aps["alert"] as? [String: Any] else { return }
        
        var intensity = -1
        if let intensityString = notification["intensity"] as? String, let anIntensity = Int(intensityString) {
            intensity = anIntensity
        }
        containerView.backgroundColor = color(for: intensity)
        
        if let title = alert["loc-key"] as? String, let args = alert["loc-args"] as? [String], let arg = args.first {
            notificationTitleLabel.text = String(format: NSLocalizedString(title, comment: ""), arg)
        }
        
        // get coordinate
        var coordinate: CLLocation?
        if let latitudeString = notification["latitude"] as? String, let latitude = Double(latitudeString),
           let longitudeString = notification["longitude"] as? String, let longitude = Double(longitudeString) {
            
            coordinate = CLLocation(latitude: latitude, longitude: longitude)
        }
        
        if  let coordinate = coordinate,
            let counter = notification["counter"],
            let dateString = notification["datetime"] as? String,
            let date = EQNUtility.getDateFrom(dateString) {
            
            let distance = EQNUser.default().lastPosition?.distance(from: coordinate) ?? 0.0
            let distanceRound = Int(round(distance / 1_000))
            let difference = Int(NSDate().timeIntervalSince(date) / 60.0)
            
            notificationDescriptionLabel.text = ""
            + NSLocalizedString("Distanza", comment: "") + " \(distanceRound) km"
            + " - " + EQNUtility.formattedString(forTimeDifference: difference)
            + "\n" + String(format: NSLocalizedString("map_number", comment: ""), "\(counter)")
        }
        
        if let coordinate = coordinate {
            let span = MKCoordinateSpan(latitudeDelta: 10.5, longitudeDelta: 10.5)
            let region = MKCoordinateRegion(center: coordinate.coordinate, span: span)
            
            mapView.setCenter(coordinate.coordinate, animated: false)
            mapView.setRegion(region, animated: true)
            
            let annotation = EQNMapAnnotationPastquake(title: "", coordinate: coordinate.coordinate, intensity: intensity)
            mapView.addAnnotation(annotation)
        }
    }
    
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard let annotation = annotation as? EQNMapAnnotationPastquake else {
            return nil
        }
        
        let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: EQNCustomAnnotationView.Identifier, for: annotation) as! EQNCustomAnnotationView
        annotationView.image = annotation.image
        annotationView.title = annotation.title
        return annotationView
    }
    
    private func color(for intensity: Int) -> UIColor? {
        switch intensity {
        case 0: return UIColor(red: 208.0/255.0, green: 234.0/255.0, blue: 201.0/255.0, alpha:1.0)
        case 1: return UIColor(red: 254.0/255.0, green: 252.0/255.0, blue: 203.0/255.0, alpha:1.0)
        case 2: return UIColor(red: 254.0/255.0, green: 186.0/255.0, blue: 186.0/255.0, alpha:1.0)
        default: return nil
        }
    }

    // MARK: - Actions
    
    @objc private func countdownTimerFired(_ sender: Timer) {
        guard let impactTimestamp = impactTimestamp else { return }
        
        let now = Date()
        let difference = max(impactTimestamp.timeIntervalSince(now), 0)
        waveTimeLabel.text = String(format: "%@ %.0f %@", NSLocalizedString("alert_wave", comment: ""), difference,  NSLocalizedString("alert_seconds", comment: ""))
        
        if difference <= 0 {
            // stop the countdown
            countdownTimer?.invalidate()
            countdownTimer = nil
        }
    }
    
    @IBAction private func shareAppTapped(_ sender: UIButton) {
        onTapShareApp?()
    }
    
    @IBAction private func rateAppTapped(_ sender: UIButton) {
        onTapRateApp?()
    }

    @IBAction private func viewInTwitterTapped(_ sender: UIButton) {
        onTapOpenTwitter?()
    }
    
    @IBAction private func closeTapped(_ sender: UIButton) {
        onTapClose?()
    }
}