MapKit integration for location features

import SwiftUI
import MapKit
import CoreLocation

struct Location: Identifiable {
    let id = UUID()
    let name: String
    let coordinate: CLLocationCoordinate2D
}

struct MapView: View {
    @StateObject private var locationManager = LocationManager()
    @State private var region = MKCoordinateRegion(
        center: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194),
        span: MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
    )

    let locations = [
        Location(name: "San Francisco", coordinate: CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194)),
        Location(name: "Los Angeles", coordinate: CLLocationCoordinate2D(latitude: 34.0522, longitude: -118.2437)),
        Location(name: "San Diego", coordinate: CLLocationCoordinate2D(latitude: 32.7157, longitude: -117.1611))
    ]

    var body: some View {
        ZStack(alignment: .bottomTrailing) {
            Map(coordinateRegion: $region, showsUserLocation: true, annotationItems: locations) { location in
                MapAnnotation(coordinate: location.coordinate) {
                    VStack {
                        Image(systemName: "mappin.circle.fill")
                            .foregroundColor(.red)
                            .font(.title)

                        Text(location.name)
                            .font(.caption)
                            .padding(4)
                            .background(Color.white)
                            .cornerRadius(4)
                    }
                }
            }

            VStack(spacing: 10) {
                Button {
                    if let userLocation = locationManager.location {
                        region.center = userLocation
                    }
                } label: {
                    Image(systemName: "location.fill")
                        .padding()
                        .background(Color.white)
                        .clipShape(Circle())
                        .shadow(radius: 3)
                }
            }
            .padding()
        }
        .onAppear {
            locationManager.requestPermission()
        }
    }
}

class LocationManager: NSObject, ObservableObject, CLLocationManagerDelegate {
    private let manager = CLLocationManager()
    @Published var location: CLLocationCoordinate2D?
    @Published var authorizationStatus: CLAuthorizationStatus?

    override init() {
        super.init()
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
    }

    func requestPermission() {
        manager.requestWhenInUseAuthorization()
        manager.startUpdatingLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        location = locations.first?.coordinate
    }

    func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
        authorizationStatus = manager.authorizationStatus
    }

    func geocodeAddress(_ address: String, completion: @escaping (CLLocationCoordinate2D?) -> Void) {
        let geocoder = CLGeocoder()
        geocoder.geocodeAddressString(address) { placemarks, error in
            completion(placemarks?.first?.location?.coordinate)
        }
    }

    func reverseGeocode(coordinate: CLLocationCoordinate2D, completion: @escaping (String?) -> Void) {
        let geocoder = CLGeocoder()
        let location = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)

        geocoder.reverseGeocodeLocation(location) { placemarks, error in
            if let placemark = placemarks?.first {
                let address = [
                    placemark.thoroughfare,
                    placemark.locality,
                    placemark.administrativeArea,
                    placemark.postalCode
                ].compactMap { $0 }.joined(separator: ", ")
                completion(address)
            } else {
                completion(nil)
            }
        }
    }
}