GoogleSignIn-iOS/Samples/Swift/DaysUntilBirthday/Shared/DaysUntilBirthday.swift

/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import SwiftUI
import GoogleSignIn

@main
struct DaysUntilBirthday: App {
  @StateObject var authViewModel = AuthenticationViewModel()

  var body: some Scene {
    WindowGroup {
      ContentView()
        .environmentObject(authViewModel)
        .onAppear {
          GIDSignIn.sharedInstance.restorePreviousSignIn { user, error in
            if let user = user {
              self.authViewModel.state = .signedIn(user)
            } else if let error = error {
              self.authViewModel.state = .signedOut
              print("There was an error restoring the previous sign-in: \(error)")
            } else {
              self.authViewModel.state = .signedOut
            }
          }
        }
        .onOpenURL { url in
          GIDSignIn.sharedInstance.handle(url)
        }
    }
  }
}