import SwiftUI
import FeatureAuth
import FeatureCheckin
import FeatureHome
import FeaturePlan
import FeatureProfile

public struct AppRootView: View {
    @State private var homeViewModel: HomeViewModel
    @State private var checkinViewModel: CheckinViewModel
    @State private var planViewModel: PlanViewModel
    @State private var profileViewModel: ProfileViewModel
    @State private var authViewModel: AuthViewModel
    @State private var selectedTab: AppTab = .home
    @State private var isAuthPresented = false

    public init() {
        _homeViewModel = State(initialValue: AppContainer.makeHomeViewModel())
        _checkinViewModel = State(initialValue: AppContainer.makeCheckinViewModel())
        _planViewModel = State(initialValue: AppContainer.makePlanViewModel())
        _profileViewModel = State(initialValue: AppContainer.makeProfileViewModel())
        _authViewModel = State(initialValue: AppContainer.makeAuthViewModel())
    }

    public var body: some View {
        TabView(selection: $selectedTab) {
            NavigationStack {
                HomeScreen(
                    viewModel: homeViewModel,
                    onNavigateToCheckin: { selectedTab = .checkin },
                    onNavigateToPlan: { selectedTab = .plan },
                    onNavigateToAuth: { isAuthPresented = true }
                )
            }
            .tabItem { Label("首页", systemImage: "house.fill") }
            .tag(AppTab.home)

            NavigationStack {
                CheckinScreen(viewModel: checkinViewModel, onNavigateToAuth: { isAuthPresented = true })
            }
            .tabItem { Label("打卡", systemImage: "checkmark.seal.fill") }
            .tag(AppTab.checkin)

            NavigationStack {
                PlanScreen(
                    viewModel: planViewModel,
                    onNavigateToAuth: { isAuthPresented = true },
                    makePlanSubmitViewModel: { type, periodKey in
                        AppContainer.makePlanSubmitViewModel(type: type, periodKey: periodKey)
                    }
                )
            }
            .tabItem { Label("计划", systemImage: "calendar") }
            .tag(AppTab.plan)

            NavigationStack {
                ProfileScreen(viewModel: profileViewModel, onNavigateToAuth: { isAuthPresented = true })
            }
            .tabItem { Label("我的", systemImage: "person.crop.circle") }
            .tag(AppTab.profile)
        }
        .sheet(isPresented: $isAuthPresented) {
            AuthScreen(viewModel: authViewModel, onLoggedIn: { isAuthPresented = false })
        }
    }
}

private enum AppTab: Hashable {
    case home
    case checkin
    case plan
    case profile
}