using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using AuthenticationServices;
using Bit.App.Abstractions;
using Bit.App.Pages;
using Bit.App.Services;
using Bit.App.Utilities;
using Bit.Core;
using Bit.Core.Abstractions;
using Bit.Core.Enums;
using Bit.Core.Services;
using Bit.Core.Utilities;
using Bit.iOS.Core.Utilities;
using Bit.iOS.Services;
using CoreNFC;
using Foundation;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

namespace Bit.iOS
{
    [Register("AppDelegate")]
    public partial class AppDelegate : FormsApplicationDelegate
    {
        const int SPLASH_VIEW_TAG = 4321;

        private NFCNdefReaderSession _nfcSession = null;
        private iOSPushNotificationHandler _pushHandler = null;
        private Core.NFCReaderDelegate _nfcDelegate = null;
        private NSTimer _clipboardTimer = null;
        private nint _clipboardBackgroundTaskId;
        private NSTimer _eventTimer = null;
        private nint _eventBackgroundTaskId;

        private IDeviceActionService _deviceActionService;
        private IMessagingService _messagingService;
        private IBroadcasterService _broadcasterService;
        private IStorageService _storageService;
        private IStateService _stateService;
        private IEventService _eventService;

        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            Forms.Init();
            InitApp();

            _deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
            _messagingService = ServiceContainer.Resolve<IMessagingService>("messagingService");
            _broadcasterService = ServiceContainer.Resolve<IBroadcasterService>("broadcasterService");
            _storageService = ServiceContainer.Resolve<IStorageService>("storageService");
            _stateService = ServiceContainer.Resolve<IStateService>("stateService");
            _eventService = ServiceContainer.Resolve<IEventService>("eventService");

            LoadApplication(new App.App(null));
            iOSCoreHelpers.AppearanceAdjustments();
            ZXing.Net.Mobile.Forms.iOS.Platform.Init();

            _broadcasterService.Subscribe(nameof(AppDelegate), async (message) =>
            {
                if (message.Command == "startEventTimer")
                {
                    StartEventTimer();
                }
                else if (message.Command == "stopEventTimer")
                {
                    var task = StopEventTimerAsync();
                }
                else if (message.Command == "updatedTheme")
                {
                    Device.BeginInvokeOnMainThread(() =>
                    {
                        iOSCoreHelpers.AppearanceAdjustments();
                    });
                }
                else if (message.Command == "listenYubiKeyOTP")
                {
                    iOSCoreHelpers.ListenYubiKey((bool)message.Data, _deviceActionService, _nfcSession, _nfcDelegate);
                }
                else if (message.Command == "unlocked")
                {
                    var needsAutofillReplacement = await _storageService.GetAsync<bool?>(
                        Core.Constants.AutofillNeedsIdentityReplacementKey);
                    if (needsAutofillReplacement.GetValueOrDefault())
                    {
                        await ASHelpers.ReplaceAllIdentities();
                    }
                }
                else if (message.Command == "showAppExtension")
                {
                    Device.BeginInvokeOnMainThread(() => ShowAppExtension((ExtensionPageViewModel)message.Data));
                }
                else if (message.Command == "syncCompleted")
                {
                    if (message.Data is Dictionary<string, object> data && data.ContainsKey("successfully"))
                    {
                        var success = data["successfully"] as bool?;
                        if (success.GetValueOrDefault() && _deviceActionService.SystemMajorVersion() >= 12)
                        {
                            await ASHelpers.ReplaceAllIdentities();
                        }
                    }
                }
                else if (message.Command == "addedCipher" || message.Command == "editedCipher" ||
                    message.Command == "restoredCipher")
                {
                    if (_deviceActionService.SystemMajorVersion() >= 12)
                    {
                        if (await ASHelpers.IdentitiesCanIncremental())
                        {
                            var cipherId = message.Data as string;
                            if (message.Command == "addedCipher" && !string.IsNullOrWhiteSpace(cipherId))
                            {
                                var identity = await ASHelpers.GetCipherIdentityAsync(cipherId);
                                if (identity == null)
                                {
                                    return;
                                }
                                await ASCredentialIdentityStore.SharedStore?.SaveCredentialIdentitiesAsync(
                                    new ASPasswordCredentialIdentity[] { identity });
                                return;
                            }
                        }
                        await ASHelpers.ReplaceAllIdentities();
                    }
                }
                else if (message.Command == "deletedCipher" || message.Command == "softDeletedCipher")
                {
                    if (_deviceActionService.SystemMajorVersion() >= 12)
                    {
                        if (await ASHelpers.IdentitiesCanIncremental())
                        {
                            var identity = ASHelpers.ToCredentialIdentity(
                                message.Data as Bit.Core.Models.View.CipherView);
                            if (identity == null)
                            {
                                return;
                            }
                            await ASCredentialIdentityStore.SharedStore?.RemoveCredentialIdentitiesAsync(
                                new ASPasswordCredentialIdentity[] { identity });
                            return;
                        }
                        await ASHelpers.ReplaceAllIdentities();
                    }
                }
                else if (message.Command == "logout")
                {
                    if (_deviceActionService.SystemMajorVersion() >= 12)
                    {
                        await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
                    }
                }
                else if ((message.Command == "softDeletedCipher" || message.Command == "restoredCipher")
                    && _deviceActionService.SystemMajorVersion() >= 12)
                {
                    await ASHelpers.ReplaceAllIdentities();
                }
                else if (message.Command == "vaultTimeoutActionChanged")
                {
                    var timeoutAction = await _stateService.GetVaultTimeoutActionAsync();
                    if (timeoutAction == VaultTimeoutAction.Logout)
                    {
                        await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
                    }
                    else
                    {
                        await ASHelpers.ReplaceAllIdentities();
                    }
                }
            });

            return base.FinishedLaunching(app, options);
        }

        public override void OnResignActivation(UIApplication uiApplication)
        {
            var view = new UIView(UIApplication.SharedApplication.KeyWindow.Frame)
            {
                Tag = SPLASH_VIEW_TAG
            };
            var backgroundView = new UIView(UIApplication.SharedApplication.KeyWindow.Frame)
            {
                BackgroundColor = ThemeManager.GetResourceColor("SplashBackgroundColor").ToUIColor()
            };
            var logo = new UIImage(!ThemeManager.UsingLightTheme ? "logo_white.png" : "logo.png");
            var imageView = new UIImageView(logo)
            {
                Center = new CoreGraphics.CGPoint(view.Center.X, view.Center.Y - 30)
            };
            view.AddSubview(backgroundView);
            view.AddSubview(imageView);
            UIApplication.SharedApplication.KeyWindow.AddSubview(view);
            UIApplication.SharedApplication.KeyWindow.BringSubviewToFront(view);
            UIApplication.SharedApplication.KeyWindow.EndEditing(true);
            base.OnResignActivation(uiApplication);
        }

        public override void DidEnterBackground(UIApplication uiApplication)
        {
            _stateService?.SetLastActiveTimeAsync(_deviceActionService.GetActiveTime());
            _messagingService?.Send("slept");
            base.DidEnterBackground(uiApplication);
        }

        public override void OnActivated(UIApplication uiApplication)
        {
            base.OnActivated(uiApplication);
            UIApplication.SharedApplication.ApplicationIconBadgeNumber = 0;
            UIApplication.SharedApplication.KeyWindow?
                .ViewWithTag(SPLASH_VIEW_TAG)?
                .RemoveFromSuperview();

            ThemeManager.UpdateThemeOnPagesAsync();
        }

        public override void WillEnterForeground(UIApplication uiApplication)
        {
            _messagingService?.Send("resumed");
            base.WillEnterForeground(uiApplication);
        }

        public override bool OpenUrl(UIApplication application, NSUrl url, string sourceApplication,
            NSObject annotation)
        {
            return true;
        }

        public override bool OpenUrl(UIApplication app, NSUrl url, NSDictionary options)
        {
            return Xamarin.Essentials.Platform.OpenUrl(app, url, options);
        }

        public override bool ContinueUserActivity(UIApplication application, NSUserActivity userActivity,
            UIApplicationRestorationHandler completionHandler)
        {
            if (Xamarin.Essentials.Platform.ContinueUserActivity(application, userActivity, completionHandler))
            {
                return true;
            }
            return base.ContinueUserActivity(application, userActivity, completionHandler);
        }

        public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
        {
            _pushHandler?.OnErrorReceived(error);
        }

        public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
        {
            _pushHandler?.OnRegisteredSuccess(deviceToken);
        }

        public override void DidRegisterUserNotificationSettings(UIApplication application,
            UIUserNotificationSettings notificationSettings)
        {
            application.RegisterForRemoteNotifications();
        }

        public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo,
            Action<UIBackgroundFetchResult> completionHandler)
        {
            _pushHandler?.OnMessageReceived(userInfo);
        }

        public override void ReceivedRemoteNotification(UIApplication application, NSDictionary userInfo)
        {
            _pushHandler?.OnMessageReceived(userInfo);
        }

        public void InitApp()
        {
            if (ServiceContainer.RegisteredServices.Count > 0)
            {
                return;
            }

            // Migration services
            ServiceContainer.Register<INativeLogService>("nativeLogService", new ConsoleLogService());

            // Note: This might cause a race condition. Investigate more.
            Task.Run(() =>
            {
                FFImageLoading.Forms.Platform.CachedImageRenderer.Init();
                FFImageLoading.ImageService.Instance.Initialize(new FFImageLoading.Config.Configuration
                {
                    FadeAnimationEnabled = false,
                    FadeAnimationForCachedImages = false
                });
            });

            iOSCoreHelpers.RegisterLocalServices();
            RegisterPush();
            var deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
            ServiceContainer.Init(deviceActionService.DeviceUserAgent, Constants.ClearCiphersCacheKey, 
                Constants.iOSAllClearCipherCacheKeys);
            iOSCoreHelpers.InitLogger();
            _pushHandler = new iOSPushNotificationHandler(
                ServiceContainer.Resolve<IPushNotificationListenerService>("pushNotificationListenerService"));
            _nfcDelegate = new Core.NFCReaderDelegate((success, message) =>
                _messagingService.Send("gotYubiKeyOTP", message));

            iOSCoreHelpers.Bootstrap(async () => await ApplyManagedSettingsAsync());
        }

        private void RegisterPush()
        {
            var notificationListenerService = new PushNotificationListenerService();
            ServiceContainer.Register<IPushNotificationListenerService>(
                "pushNotificationListenerService", notificationListenerService);
            var iosPushNotificationService = new iOSPushNotificationService();
            ServiceContainer.Register<IPushNotificationService>(
                "pushNotificationService", iosPushNotificationService);
        }

        private void ShowAppExtension(ExtensionPageViewModel extensionPageViewModel)
        {
            var itemProvider = new NSItemProvider(new NSDictionary(), Core.Constants.UTTypeAppExtensionSetup);
            var extensionItem = new NSExtensionItem
            {
                Attachments = new NSItemProvider[] { itemProvider }
            };
            var activityViewController = new UIActivityViewController(new NSExtensionItem[] { extensionItem }, null)
            {
                CompletionHandler = (activityType, completed) =>
                {
                    extensionPageViewModel.EnabledExtension(completed && activityType == iOSCoreHelpers.AppExtensionId);
                }
            };
            var modal = UIApplication.SharedApplication.KeyWindow.RootViewController.ModalViewController;
            if (activityViewController.PopoverPresentationController != null)
            {
                activityViewController.PopoverPresentationController.SourceView = modal.View;
                var frame = UIScreen.MainScreen.Bounds;
                frame.Height /= 2;
                activityViewController.PopoverPresentationController.SourceRect = frame;
            }
            modal.PresentViewController(activityViewController, true, null);
        }

        private void StartEventTimer()
        {
            _eventTimer?.Invalidate();
            _eventTimer?.Dispose();
            _eventTimer = null;
            Device.BeginInvokeOnMainThread(() =>
            {
                _eventTimer = NSTimer.CreateScheduledTimer(60, true, timer =>
                {
                    var task = Task.Run(() => _eventService.UploadEventsAsync());
                });
            });
        }

        private async Task StopEventTimerAsync()
        {
            _eventTimer?.Invalidate();
            _eventTimer?.Dispose();
            _eventTimer = null;
            if (_eventBackgroundTaskId > 0)
            {
                UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
                _eventBackgroundTaskId = 0;
            }
            _eventBackgroundTaskId = UIApplication.SharedApplication.BeginBackgroundTask(() =>
            {
                UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
                _eventBackgroundTaskId = 0;
            });
            await _eventService.UploadEventsAsync();
            UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
            _eventBackgroundTaskId = 0;
        }

        private async Task ApplyManagedSettingsAsync()
        {
            var userDefaults = NSUserDefaults.StandardUserDefaults;
            var managedSettings = userDefaults.DictionaryForKey("com.apple.configuration.managed");
            if (managedSettings != null && managedSettings.Count > 0)
            {
                var dict = new Dictionary<string, string>();
                foreach (var setting in managedSettings)
                {
                    dict.Add(setting.Key.ToString(), setting.Value?.ToString());
                }
                await AppHelpers.SetPreconfiguredSettingsAsync(dict);
            }
        }
    }
}