import SwiftUI

struct RootView: View {
    @EnvironmentObject var appState: AppState

    var body: some View {
        TabView(selection: $appState.selectedTab) {
            ScanScreen()
                .tabItem {
                    Label(AppState.Tab.scan.title, systemImage: AppState.Tab.scan.icon)
                }
                .tag(AppState.Tab.scan)

            FavoritesScreen()
                .tabItem {
                    Label(AppState.Tab.favorites.title, systemImage: AppState.Tab.favorites.icon)
                }
                .tag(AppState.Tab.favorites)

            HistoryScreen()
                .tabItem {
                    Label(AppState.Tab.history.title, systemImage: AppState.Tab.history.icon)
                }
                .tag(AppState.Tab.history)

            AccountScreen()
                .tabItem {
                    Label(AppState.Tab.account.title, systemImage: AppState.Tab.account.icon)
                }
                .tag(AppState.Tab.account)
        }
        .tint(.green)
        .sheet(isPresented: $appState.showLoginSheet) {
            LoginSheet()
                .environmentObject(appState)
        }
        .sheet(isPresented: $appState.showRegisterSheet) {
            RegisterSheet()
                .environmentObject(appState)
        }
        .overlay {
            if let error = appState.errorMessage {
                VStack {
                    Spacer()
                    Text(error)
                        .font(.subheadline)
                        .foregroundColor(.white)
                        .padding()
                        .background(Color.red.opacity(0.9))
                        .cornerRadius(10)
                        .padding(.bottom, 100)
                }
                .transition(.move(edge: .bottom).combined(with: .opacity))
                .animation(.easeInOut, value: appState.errorMessage)
            }
        }
    }
}