/*
 * 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

struct UserProfileView: View {
  @EnvironmentObject var authViewModel: AuthenticationViewModel
  @StateObject var birthdayViewModel = BirthdayViewModel()
  private var user: GIDGoogleUser? {
    return GIDSignIn.sharedInstance.currentUser
  }

  var body: some View {
    return Group {
      if let userProfile = user?.profile {
        VStack(spacing: 10) {
          HStack(alignment: .top) {
            UserProfileImageView(userProfile: userProfile)
              .padding(.leading)
            VStack(alignment: .leading) {
              Text(userProfile.name)
                .font(.headline)
              Text(userProfile.email)
            }
          }
          NavigationLink(
            NSLocalizedString("View Days Until Birthday", comment: "View birthday days"),
            destination: BirthdayView(birthdayViewModel: birthdayViewModel)
              .onAppear {
                guard self.birthdayViewModel.birthday != nil else {
                  if !self.authViewModel.hasBirthdayReadScope {
                    guard let viewController = UIApplication.shared.windows.first?.rootViewController else {
                      print("There was no root view controller")
                      return
                    }
                    Task { @MainActor in
                      do {
                        let signInResult = try await authViewModel.addBirthdayReadScope(
                          viewController: viewController
                        )
                        self.authViewModel.state = .signedIn(signInResult.user)
                        self.birthdayViewModel.fetchBirthday()
                      } catch {
                        print("Failed to fetch birthday: \(error)")
                      }
                    }
                  } else {
                    self.birthdayViewModel.fetchBirthday()
                  }
                  return
                }
              })
          Spacer()
        }
        .toolbar {
          ToolbarItemGroup(placement: .navigationBarTrailing) {
            Button(
              NSLocalizedString("Disconnect", comment: "Disconnect button"),
              action: authViewModel.disconnect
            )
            Button(
              NSLocalizedString("Sign Out", comment: "Sign out button"),
              action: authViewModel.signOut
            )
          }
        }
      } else {
        Text(NSLocalizedString("Failed to get user profile!", comment: "Empty user profile text"))
      }
    }
  }
}