import SwiftUI

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

    var body: some Scene {
        #if os(macOS)
        MenuBarExtra("idp.global", systemImage: "shield.lefthalf.filled") {
            RootSceneContent(model: model)
                .frame(minWidth: 400, minHeight: 560)
                .tint(IdP.tint)
                .task {
                    await model.bootstrap()
                }
                .alert("Something went wrong", isPresented: errorPresented) {
                    Button("OK") {
                        model.errorMessage = nil
                    }
                } message: {
                    Text(model.errorMessage ?? "")
                }
        }
        .menuBarExtraStyle(.window)
        #else
        WindowGroup {
            RootSceneContent(model: model)
                .tint(IdP.tint)
                .task {
                    await model.bootstrap()
                }
                .alert("Something went wrong", isPresented: errorPresented) {
                    Button("OK") {
                        model.errorMessage = nil
                    }
                } message: {
                    Text(model.errorMessage ?? "")
                }
        }
        #endif
    }

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

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

    var body: some View {
        Group {
            if model.session == nil {
                LoginRootView(model: model)
            } else if model.isShowingPairingSuccess {
                PairingSuccessView()
            } else {
                #if os(macOS)
                MenuBarPopover(model: model)
                #else
                HomeRootView(model: model)
                #endif
            }
        }
        .background {
            Color.idpGroupedBackground.ignoresSafeArea()
        }
        .onOpenURL { url in
            model.openDeepLink(url)
        }
    }
}

private struct PairingSuccessView: View {
    var body: some View {
        VStack(spacing: 18) {
            Image(systemName: "checkmark.circle.fill")
                .font(.system(size: 72, weight: .semibold))
                .foregroundStyle(.green)

            Text("Passport linked")
                .font(.title2.weight(.semibold))

            Text("Your device is ready to approve sign-ins.")
                .font(.subheadline)
                .foregroundStyle(.secondary)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .padding(32)
    }
}