import CoreLocation
import MapKit
import SwiftUI

struct AttachmentLocationPickerView: View {
    @StateObject var locationManager = LocationManager()
    @State private var region = MKCoordinateRegion()
    @State var userInteracted: Bool = false

    var body: some View {
        Map(
            coordinateRegion: $region,
            interactionModes: .all,
            showsUserLocation: false,
            userTrackingMode: .none
        )
        .onAppear {
            locationManager.start()
        }
        .onDisappear {
            locationManager.stop()
        }
        .onChange(of: locationManager.region) { region in
            if !userInteracted {
                let currentLoc = CLLocation(latitude: self.region.center.latitude, longitude: self.region.center.longitude)
                let newLoc = CLLocation(latitude: region.center.latitude, longitude: region.center.longitude)
                if newLoc.distance(from: currentLoc) > 10 {
                    DispatchQueue.main.async {
                        withAnimation {
                            self.region = region
                        }
                    }
                }
            }
        }
        .overlay {
            Image(systemName: "mappin")
                .font(.title2)
                .foregroundColor(.Material.Elements.active)
        }
        .onChange(of: region) { region in
            print("Region changed: \(region.center)")
        }
    }
}

class LocationManager: NSObject, ObservableObject, CLLocationManagerDelegate {
    @Published var region = MKCoordinateRegion()
    private let locationManager = CLLocationManager()

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

    func start() {
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }

    func stop() {
        locationManager.stopUpdatingLocation()
    }

    func locationManager(_: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.last else { return }
        region = MKCoordinateRegion(center: location.coordinate, span: MKCoordinateSpan(latitudeDelta: 0.001, longitudeDelta: 0.001))
    }
}

extension MKCoordinateRegion: Equatable {
    public static func == (lhs: MKCoordinateRegion, rhs: MKCoordinateRegion) -> Bool {
        lhs.center.latitude == rhs.center.latitude &&
            lhs.center.longitude == rhs.center.longitude &&
            lhs.span.latitudeDelta == rhs.span.latitudeDelta &&
            lhs.span.longitudeDelta == rhs.span.longitudeDelta
    }
}