ContentView.swift

import SwiftUI
import AuthenticationServices
import SafariServices

struct ContentView: View {
    @State private var isPresented = false
    @State private var token: String?

    var body: some View {
        VStack {
            if let token = token {
                Text("Authenticated with token: \(token)")
            } else {
                Button("Sign In") {
                    isPresented = true
                }
            }
        }
        .sheet(isPresented: $isPresented) {
            SafariView(url: URL(string: "https://aero-web-alpha-d0932c904dc1.herokuapp.com/api/auth/signin")!) { callbackURL in
                // Handle the callback URL here
                if let token = extractToken(from: callbackURL) {
                    self.token = token
                    self.isPresented = false
                }
            }
        }
    }
    
    private func extractToken(from url: URL) -> String? {
        // Implement token extraction logic here
        // This is a placeholder implementation
        return url.absoluteString.components(separatedBy: "token=").last
    }
}

struct SafariView: UIViewControllerRepresentable {
    let url: URL
    let onFinish: (URL) -> Void

    func makeUIViewController(context: Context) -> SFSafariViewController {
        let config = SFSafariViewController.Configuration()
        config.entersReaderIfAvailable = false
        let controller = SFSafariViewController(url: url, configuration: config)
        controller.dismissButtonStyle = .close
        controller.delegate = context.coordinator
        return controller
    }

    func updateUIViewController(_ uiViewController: SFSafariViewController, context: Context) {}

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, SFSafariViewControllerDelegate {
        let parent: SafariView

        init(_ parent: SafariView) {
            self.parent = parent
        }

        func safariViewController(_ controller: SFSafariViewController, initialLoadDidRedirectTo URL: URL) {
            // Check if the URL is your callback URL
            if URL.absoluteString.starts(with: "your-app-scheme://callback") {
                controller.dismiss(animated: true) {
                    self.parent.onFinish(URL)
                }
            }
        }
    }
}