swiftapp/swift/Sources/App/IDPGlobalApp.swift

import SwiftUI

@main
struct IDPGlobalApp: App {
    @StateObject private var model = AppViewModel()

    var body: some Scene {
        WindowGroup {
            RootView(model: model)
                .tint(AppTheme.accent)
                .task {
                    await model.bootstrap()
                }
                .alert("Something went wrong", isPresented: errorPresented) {
                    Button("OK") {
                        model.errorMessage = nil
                    }
                } message: {
                    Text(model.errorMessage ?? "")
                }
        }
        #if os(macOS)
        .defaultSize(width: 1380, height: 920)
        #endif
    }

    private var errorPresented: Binding<Bool> {
        Binding(
            get: { model.errorMessage != nil },
            set: { isPresented in
                if !isPresented {
                    model.errorMessage = nil
                }
            }
        )
    }
}

private struct RootView: View {
    @ObservedObject var model: AppViewModel

    var body: some View {
        Group {
            if model.session == nil {
                LoginRootView(model: model)
            } else {
                HomeRootView(model: model)
            }
        }
        .background {
            AppBackground()
        }
    }
}