import SwiftUI
import MapKit

@MainActor
@Observable
final class MapInteractionViewModel {
    // Default region: Continental US
    static let defaultRegion = MKCoordinateRegion(
        center: CLLocationCoordinate2D(latitude: 39.8283, longitude: -98.5795),
        span: MKCoordinateSpan(latitudeDelta: 35, longitudeDelta: 55)
    )

    // City-level zoom span
    static let stadiumZoomSpan = MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)

    var region: MKCoordinateRegion = MapInteractionViewModel.defaultRegion
    var hasUserInteracted: Bool = false
    var selectedStadiumId: String?

    var shouldShowResetButton: Bool {
        hasUserInteracted
    }

    func userDidInteract() {
        hasUserInteracted = true
    }

    func resetToDefault() {
        Theme.Animation.withMotion(.easeInOut(duration: 0.5)) {
            region = MapInteractionViewModel.defaultRegion
        }
        hasUserInteracted = false
        selectedStadiumId = nil
    }

    func zoomToStadium(at coordinate: CLLocationCoordinate2D) {
        Theme.Animation.withMotion(.easeInOut(duration: 0.3)) {
            region = MKCoordinateRegion(
                center: coordinate,
                span: MapInteractionViewModel.stadiumZoomSpan
            )
        }
        hasUserInteracted = true
    }

    func selectStadium(id: String, coordinate: CLLocationCoordinate2D) {
        selectedStadiumId = id
        zoomToStadium(at: coordinate)
    }

    func deselectStadium() {
        selectedStadiumId = nil
    }
}