IceCubes/IceCubesApp/App/Tabs/Settings/PushNotificationsView.swift

import SwiftUI
import Models
import DesignSystem
import NukeUI
import Network
import UserNotifications
import Env

struct PushNotificationsView: View {
  @EnvironmentObject private var theme: Theme
  @EnvironmentObject private var appAccountsManager: AppAccountsManager
  @EnvironmentObject private var pushNotifications: PushNotificationsService
  
  @State private var subscriptions: [PushSubscription] = []
    
  var body: some View {
    Form {
      Section {
        Toggle(isOn: $pushNotifications.isPushEnabled) {
          Text("Push notifications")
        }
      } footer: {
        Text("Receive push notifications on new activities")
      }
      .listRowBackground(theme.primaryBackgroundColor)
      
      if pushNotifications.isPushEnabled {
        Section {
          Toggle(isOn: $pushNotifications.isMentionNotificationEnabled) {
            Label("Mentions", systemImage: "at")
          }
          Toggle(isOn: $pushNotifications.isFollowNotificationEnabled) {
            Label("Follows", systemImage: "person.badge.plus")
          }
          Toggle(isOn: $pushNotifications.isFavoriteNotificationEnabled) {
            Label("Favorites", systemImage: "star")
          }
          Toggle(isOn: $pushNotifications.isReblogNotificationEnabled) {
            Label("Boosts", systemImage: "arrow.left.arrow.right.circle")
          }
          Toggle(isOn: $pushNotifications.isPollNotificationEnabled) {
            Label("Polls Results", systemImage: "chart.bar")
          }
          Toggle(isOn: $pushNotifications.isNewPostsNotificationEnabled) {
            Label("New Posts", systemImage: "bubble.right")
          }
        }
        .listRowBackground(theme.primaryBackgroundColor)
        .transition(.move(edge: .bottom))
      }
      
      Section {
        VStack(alignment: .leading) {
          Text("Auth key:")
          Text(pushNotifications.notificationsAuthKeyAsKey.base64EncodedString())
            .font(.footnote)
            .foregroundColor(.gray)
        }
        VStack(alignment: .leading) {
          Text("Public key:")
          Text(pushNotifications.notificationsPrivateKeyAsKey.publicKey.x963Representation.base64EncodedString())
            .font(.footnote)
            .foregroundColor(.gray)
        }
      } header: {
        Text("Keys information")
      } footer: {
        Text("Your notifications are sent through a proxy server and are encrypted using a public/private key pair that is stored only on your device. The public key is sent to the server, so it can encrypt your notifications so that only your device can decrypt them.")
      }
      .listRowBackground(theme.primaryBackgroundColor)

    }
    .navigationTitle("Push Notifications")
    .scrollContentBackground(.hidden)
    .background(theme.secondaryBackgroundColor)
    .onAppear {
      Task {
        await pushNotifications.fetchSubscriptions(accounts: appAccountsManager.pushAccounts)
      }
    }
    .onChange(of: pushNotifications.isPushEnabled) { newValue in
      pushNotifications.isUserPushEnabled = newValue
      if !newValue {
        Task {
          await pushNotifications.deleteSubscriptions(accounts: appAccountsManager.pushAccounts)
        }
      } else {
        updateSubscriptions()
      }
    }
    .onChange(of: pushNotifications.isFollowNotificationEnabled) { _ in
      updateSubscriptions()
    }
    .onChange(of: pushNotifications.isPollNotificationEnabled) { _ in
      updateSubscriptions()
    }
    .onChange(of: pushNotifications.isReblogNotificationEnabled) { _ in
      updateSubscriptions()
    }
    .onChange(of: pushNotifications.isMentionNotificationEnabled) { _ in
      updateSubscriptions()
    }
    .onChange(of: pushNotifications.isFavoriteNotificationEnabled) { _ in
      updateSubscriptions()
    }
    .onChange(of: pushNotifications.isNewPostsNotificationEnabled) { _ in
      updateSubscriptions()
    }
  }
  
  private func updateSubscriptions() {
    Task {
      await pushNotifications.updateSubscriptions(accounts: appAccountsManager.pushAccounts)
    }
  }
}