voice-cat/clients/apple/dotnet/VoiceCat.iOS/RootViewController.cs

using VoiceCat.Core;
using UIKit;

namespace VoiceCat.iOS;

internal sealed class RootViewController : UIViewController
{
    private readonly AppModel model;
    private UIViewController? current;
    internal RootViewController(AppModel model) { this.model = model; model.Changed += Refresh; model.IdentityRequested += ShowIdentity; }
    public override void ViewDidLoad() { base.ViewDidLoad(); View!.BackgroundColor = UIColor.SystemBackground; Refresh(); }

    private void Refresh()
    {
        bool main = model.IsConnected;
        if (current is MainTabController && main || current is UINavigationController && !main) return;
        UIViewController next = main ? new MainTabController(model) : new UINavigationController(new ServerListController(model));
        if (current is not null) { current.WillMoveToParentViewController(null); current.View!.RemoveFromSuperview(); current.RemoveFromParentViewController(); }
        UIView rootView = View!, nextView = next.View!;
        AddChildViewController(next); nextView.Frame = rootView.Bounds; nextView.AutoresizingMask = UIViewAutoresizing.All; rootView.AddSubview(nextView); next.DidMoveToParentViewController(this); current = next;
    }

    private void ShowIdentity(ServerIdentityChallenge challenge)
    {
        UIAlertController alert = UIAlertController.Create(challenge.Status == VoiceCat.Crypto.TofuStatus.Mismatch ? "Server Identity Changed" : "New Server Identity",
            $"{challenge.Host}:{challenge.Port}\n\nSHA-256\n{challenge.CertificateFingerprint}", UIAlertControllerStyle.Alert);
        alert.AddAction(UIAlertAction.Create("Reject", UIAlertActionStyle.Destructive, _ => model.ResolveIdentity(false)));
        alert.AddAction(UIAlertAction.Create("Trust", UIAlertActionStyle.Default, _ => model.ResolveIdentity(true)));
        PresentViewController(alert, true, null);
    }
}