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swift
2 months ago
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import SwiftUI
import Combine

@MainActor
struct LaunchViewModel: View {
    @ObservedObject var viewModel = AuthenticationViewModel()

    @State private var navigationDestination: NavigationDestination? = .welcomeScreen
    
    enum NavigationDestination {
        case welcomeScreen
        case onboardingScreen
        case mainScreen
        case mainAuthScreen
    }
    
    var body: some View {
        NavigationView {
            Group {
                switch navigationDestination {
                case .welcomeScreen:
                    WelcomeScreen()
                        .onAppear {
                            async {
                                await handleWelcomeScreen()
                            }
                        }
                case .onboardingScreen:
                    OnBoardingScreen()
                case .mainScreen:
                    MainScreenView()
                        .environmentObject(viewModel)
                case .mainAuthScreen:
                    MainAuthView(isLoggedIn: $viewModel.isLoggedIn)
                case .none:
                    ProgressView()
                }
            }
            .onAppear {
                async {
                    await handleOnAppear()
                }
            }
        }
    }
    
    private func handleWelcomeScreen() async {
        let isNewUser = await viewModel.checkIfNewUser()
        if isNewUser {
            navigationDestination = .onboardingScreen
        } else {
            await checkAuthentication()
        }
    }
    
    private func handleOnAppear() async {
        if UserDefaults.standard.bool(forKey: "hasSeenWelcomeScreen") {
            let isNewUser = await viewModel.checkIfNewUser()
            if isNewUser {
                navigationDestination = .onboardingScreen
            } else {
                await checkAuthentication()
            }
        } else {
            UserDefaults.standard.set(true, forKey: "hasSeenWelcomeScreen")
            UserDefaults.standard.set(true, forKey: "isNewUser")
        }
    }
    
    private func checkAuthentication() async {
        let isAuthenticated = await viewModel.checkIfAuthenticated()
        if isAuthenticated {
            navigationDestination = .mainScreen
            viewModel.isLoggedIn = true
        } else {
            navigationDestination = .mainAuthScreen
            viewModel.isLoggedIn = false
        }
    }
}
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