import SwiftUI
import SwiftData

struct MainTabView: View {
    @Environment(AuthSession.self) private var auth
    @Environment(\.modelContext) private var ctx
    @State private var selectedTab = 0
    private let launcher = WalkLauncher.shared

    var body: some View {
        TabView(selection: $selectedTab) {
            HeimView()
                .tabItem { Label("Heim", systemImage: "house.fill") }
                .tag(0)

            RoutesListView()
                .tabItem { Label("Touren", systemImage: "map.fill") }
                .tag(1)

            TrackingView()
                .tabItem { Label("Aufnehmen", systemImage: "figure.walk") }
                .tag(2)

            SettingsView()
                .tabItem { Label("Mehr", systemImage: "person.crop.circle") }
                .tag(3)
        }
        .task {
            await auth.loadProfile()
            // Offline gesicherte Touren beim Start hochladen (falls online).
            await OfflineCache.syncPendingRoutes(in: ctx)
            launcher.consumePendingFlag()
        }
        .onChange(of: launcher.pendingStart) { _, pending in
            if pending { selectedTab = 2 }
        }
    }
}