using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using TINK.Model.Connector;
using TINK.Model.Device;
using TINK.Settings;
using TINK.Model.User.Account;
using TINK.Model.Settings;
using TINK.Model.Logging;
using Serilog.Events;
using Serilog.Core;
using Serilog;
using Plugin.Connectivity;
using System.Threading;
using TINK.Services.BluetoothLock;
using TINK.Model.Services.Geolocation;
using TINK.Model.Services.CopriApi.ServerUris;
using Plugin.Permissions.Abstractions;
using TINK.Services.BluetoothLock.Crypto;
using TINK.ViewModel.Map;
using TINK.ViewModel.Settings;
using TINK.Services;
using TINK.Services.BluetoothLock.BLE;
using Xamarin.Forms;
using TINK.Model.Station;

namespace TINK.Model
{
    [DataContract]
    public class TinkApp : ITinkApp
    {
        /// <summary> Delegate used by login view to commit user name and password. </summary>
        /// <param name="p_strMailAddress">Mail address used as id login.</param>
        /// <param name="p_strPassword">Password for login.</param>
        /// <returns>True if setting credentials succeeded.</returns>
        public delegate bool SetCredentialsDelegate(string p_strMailAddress, string p_strPassword);

        /// <summary>Returns the id of the app (sharee.bike) to be identified by copri.</summary>
        public static string MerchantId { get; private set; }

        /// <summary>
        /// Holds status about whants new page.
        /// </summary>
        public WhatsNew WhatsNew { get; private set; }

        /// <summary>Sets flag whats new page was already shown to true. </summary>
        public void SetWhatsNewWasShown() => WhatsNew = WhatsNew.SetWasShown();

        /// <summary>Holds uris of copri servers. </summary>
        public CopriServerUriList Uris { get; }

        /// <summary> Holds the filters loaded from settings. </summary>
        public IGroupFilterSettings FilterGroupSetting { get; set; }

        /// <summary> Holds the filter which is applied on the map view. Either TINK or Konrad stations are displayed. </summary>
        private IGroupFilterMapPage m_oFilterDictionaryMapPage;

        /// <summary> Holds the filter which is applied on the map view. Either TINK or Konrad stations are displayed. </summary>
        public IGroupFilterMapPage GroupFilterMapPage
        {
            get => m_oFilterDictionaryMapPage;
            set => m_oFilterDictionaryMapPage = value ?? new GroupFilterMapPage();
        }

        /// <summary> Value indicating whether map is centerted to current position or not. </summary>
        public bool CenterMapToCurrentLocation { get; set; }

        /// <summary> Holds the map area to display when starting app for first time/ when center map to is off. </summary>
        private Xamarin.Forms.GoogleMaps.MapSpan HomeMapSpan { get; }

        /// <summary> Holds the map area where user is or was located or null if this position is unknown. </summary>
        public Xamarin.Forms.GoogleMaps.MapSpan UserMapSpan { get; set; } = null;

        /// <summary> Holds the map span to display either default span or span centered to current position depending on option <see cref="CenterMapToCurrentLocation"/>.</summary>
        public Xamarin.Forms.GoogleMaps.MapSpan ActiveMapSpan 
            => CenterMapToCurrentLocation 
                ? UserMapSpan ?? HomeMapSpan
                : HomeMapSpan;

        /// <summary> Gets the minimum logging level. </summary>
        public LogEventLevel MinimumLogEventLevel { get; set; }

        /// <summary> Gets a value indicating whether reporting level is verbose or not.</summary>
        public bool IsReportLevelVerbose { get; set; }

        /// <summary> Holds the uri which is applied after restart. </summary>
        public Uri NextActiveUri { get; set; }

        /// <summary> Saves object to file. </summary>
        public void Save()
            => JsonSettingsDictionary.Serialize(
                        SettingsFileFolder,
                        new Dictionary<string, string>()
                            .SetGroupFilterMapPage(GroupFilterMapPage)
                            .SetCopriHostUri(NextActiveUri.AbsoluteUri)
                            .SetPollingParameters(Polling)
                            .SetGroupFilterSettings(FilterGroupSetting)
                            .SetAppVersion(AppVersion)
                            .SetMinimumLoggingLevel(MinimumLogEventLevel)
                            .SetIsReportLevelVerbose(IsReportLevelVerbose)
                            .SetExpiresAfter(ExpiresAfter)
                            .SetWhatsNew(AppVersion)
                            .SetActiveLockService(LocksServices.Active.GetType().FullName)
                            .SetActiveGeolocationService(GeolocationServices.Active.GetType().FullName)
                            .SetCenterMapToCurrentLocation(CenterMapToCurrentLocation)
                            .SetLogToExternalFolder(LogToExternalFolder)
                            .SetConnectTimeout(LocksServices.Active.TimeOut.MultiConnect)
                            .SetIsSiteCachingOn(IsSiteCachingOn)
                            .SetActiveTheme(Themes.Active.GetType().FullName));

        /// <summary> 
        /// Update connector from filters when
        /// - login state changes
        /// - view is toggled (TINK to Kornrad and vice versa)
        /// </summary>
        public void UpdateConnector()
        {
            // Create filtered connector.
            m_oConnector = FilteredConnectorFactory.Create(
                FilterGroupSetting.DoFilter(ActiveUser.DoFilter(GroupFilterMapPage.DoFilter())),
                m_oConnector.Connector);
        }

        /// <summary>Polling periode.</summary>
        public PollingParameters Polling { get; set; }

        public TimeSpan ExpiresAfter { get; set; }

        /// <summary> Holds the version of the app.</summary>
        public Version AppVersion { get; }

        /// <summary>
        /// Holds the default polling value.
        /// </summary>
#if USCSHARP9
        public TimeSpan DefaultPolling => new (0, 0, 10);
#else
        public TimeSpan DefaultPolling => new TimeSpan(0, 0, 10);
#endif

        /// <summary> Constructs TinkApp object. </summary>
        /// <param name="settings"></param>
        /// <param name="accountStore"></param>
        /// <param name="passwordValidator"></param>
        /// <param name="p_oConnectorFactory"></param>
        /// <param name="geolocationService">Null in productive context. Service to querry geoloation for testing purposes. Parameter can be made optional.</param>
        /// <param name="locksService">Null in productive context. Service to control locks/ get locks information for testing proposes. Parameter can be made optional.</param>
        /// <param name="device">Object allowing platform specific operations.</param>
        /// <param name="specialFolder"></param>
        /// <param name="p_oDateTimeProvider"></param>
        /// <param name="isConnectedFunc">True if connector has access to copri server, false if cached values are used.</param>
        /// <param name="currentVersion">Version of the app. If null version is set to a fixed dummy value (3.0.122) for testing purposes.</param>
        /// <param name="lastVersion">Version of app which was used before this session.</param>
        /// <param name="whatsNewShownInVersion"> Holds 
        /// - the version when whats new info was shown last or 
        /// - version of application used last if whats new functionality was not implemented in this version or
        /// - null if app is installed for the first time.
        /// /// </param>
        public TinkApp(
            Settings.Settings settings,
            IStore accountStore,
            Func<bool, Uri, string /* session cookie*/, string /* mail address*/, TimeSpan, IConnector> connectorFactory,
            string merchantId,
            IServicesContainer<IGeolocation> geolocationServicesContainer,
            ILocksService locksService,
            ISmartDevice device,
            ISpecialFolder specialFolder,
            ICipher cipher,
            IPermissions permissions = null,
            object arendiCentral = null,
            Func<bool> isConnectedFunc = null,
            Action<SendOrPostCallback, object> postAction = null,
            Version currentVersion = null,
            Version lastVersion = null,
            Version whatsNewShownInVersion = null)
        {
            PostAction = postAction
                ?? ((d, obj) => d(obj));

            ConnectorFactory = connectorFactory
                ?? throw new ArgumentException("Can not instantiate TinkApp- object. No connector factory object available.");

            MerchantId = merchantId
                ?? throw new ArgumentException($"Can not instantiate {nameof(TinkApp)}. No merchant id available.");

            Cipher = cipher ?? new Cipher();

            var locksServices = locksService != null
                ? new HashSet<ILocksService> { locksService }
                : new HashSet<ILocksService> {
                    new LockItByScanServiceEventBased(Cipher),
                    new LockItByScanServicePolling(Cipher),
                    new LockItByGuidService(Cipher),
#if BLUETOOTHLE // Requires LockItBluetoothle library.
                    new Bluetoothle.LockItByGuidService(Cipher),
#endif
#if ARENDI // Requires LockItArendi library.
                    new Arendi.LockItByGuidService(Cipher, arendiCentral),
                    new Arendi.LockItByScanService(Cipher, arendiCentral),
#endif
                    new LocksServiceInReach(),
                    new LocksServiceOutOfReach(),
                };

            LocksServices = new LocksServicesContainerMutable( 
                lastVersion >= new Version(3, 0, 173) ? settings.ActiveLockService : LocksServicesContainerMutable.DefaultLocksservice,
                locksServices);

            LocksServices.SetTimeOut(settings.ConnectTimeout);

            Themes = new ServicesContainerMutable<object>(
                new HashSet<object> { 
                    new Themes.Konrad(), 
                    new Themes.ShareeBike(), 
                    new Themes.LastenradBayern() 
                },
                settings.ActiveTheme);

            GeolocationServices = geolocationServicesContainer
                ?? throw new ArgumentException($"Can not instantiate {nameof(TinkApp)}- object. No geolocation services container object available.");

            FilterGroupSetting = settings.GroupFilterSettings;
            GroupFilterMapPage = settings.GroupFilterMapPage;

            CenterMapToCurrentLocation = settings.CenterMapToCurrentLocation;

            HomeMapSpan = settings.MapSpan;

            SmartDevice = device
               ?? throw new ArgumentException("Can not instantiate TinkApp- object. No device information provider available.");

            if (specialFolder == null)
            {
                throw new ArgumentException("Can not instantiate TinkApp- object. No special folder provider available.");
            }

            // Set logging level.
            Level.MinimumLevel = settings.MinimumLogEventLevel;
            
            LogToExternalFolder = settings.LogToExternalFolder;

            IsSiteCachingOn = settings.IsSiteCachingOn;

            ExternalFolder = specialFolder.GetExternalFilesDir();

            SettingsFileFolder = specialFolder.GetInternalPersonalDir();

            ActiveUser = new User.User(
                accountStore.GetType().Name == "StoreLegacy" ? new Store() : accountStore,
                accountStore.Load().Result,
                device.Identifier);

            this.isConnectedFunc = isConnectedFunc ?? (() => CrossConnectivity.Current.IsConnected);

            ExpiresAfter = settings.ExpiresAfter;

            // Create filtered connector for offline mode.
            m_oConnector = FilteredConnectorFactory.Create(
                FilterGroupSetting.DoFilter(GroupFilterMapPage.DoFilter()),
                ConnectorFactory(GetIsConnected(), settings.ActiveUri, ActiveUser.SessionCookie, ActiveUser.Mail, ExpiresAfter));

            // Get uris from file.
            // Initialize all settings to defaults
            // Process uris.
            Uris = new CopriServerUriList(settings.ActiveUri);

            NextActiveUri = Uris.ActiveUri;

            Polling = settings.PollingParameters ??
                throw new ArgumentException("Can not instantiate TinkApp- object. Polling parameters must never be null.");

            AppVersion = currentVersion ?? new Version(3, 0, 122);

            MinimumLogEventLevel = settings.MinimumLogEventLevel;

            IsReportLevelVerbose = settings.IsReportLevelVerbose;

            WhatsNew = new WhatsNew(AppVersion, lastVersion, whatsNewShownInVersion);

            if (Themes.Active.GetType().FullName == typeof(Themes.ShareeBike).FullName)
            {
                // Nothing to do.
                // Theme to activate is default theme.
                return;
            }

            // Set active app theme
            ICollection<ResourceDictionary> mergedDictionaries = Application.Current.Resources.MergedDictionaries;
            if (mergedDictionaries == null)
            {
                Log.ForContext<TinkApp>().Error("No merged dictionary available.");
                return;
            }

            mergedDictionaries.Clear();

            if (Themes.Active.GetType().FullName == typeof(Themes.Konrad).FullName)
            {
                mergedDictionaries.Add(new Themes.Konrad());
            } 
            else if (Themes.Active.GetType().FullName == typeof(Themes.LastenradBayern).FullName)
            {
                mergedDictionaries.Add(new Themes.LastenradBayern());
            }
            else
            {
                Log.ForContext<TinkApp>().Debug($"No theme {Themes.Active} found.");
            }
        }

        /// <summary> Holds the user of the app. </summary>
        [DataMember]
        public User.User ActiveUser { get; }

        /// <summary> Reference of object which provides device information. </summary>
        public ISmartDevice SmartDevice { get; }

        /// <summary> Holds delegate to determine whether device is connected or not.</summary>
        private readonly Func<bool> isConnectedFunc;

        /// <summary> Gets whether device is connected to internet or not. </summary>
        public bool GetIsConnected() => isConnectedFunc();

        /// <summary> Holds the folder where settings files are stored. </summary>
        public string SettingsFileFolder { get; }

        /// <summary> Holds folder parent of the folder where log files are stored. </summary>
        public string LogFileParentFolder => LogToExternalFolder && !string.IsNullOrEmpty(ExternalFolder) ? ExternalFolder : SettingsFileFolder;

        /// <summary> Holds a value indicating whether to log to external or internal folder. </summary>
        public bool LogToExternalFolder { get; set; }

        /// <summary> Holds a value indicating whether Site caching is on or off. </summary>
        public bool IsSiteCachingOn { get; set; }

        /// <summary> External folder. </summary>
        public string ExternalFolder { get; }

        public ICipher Cipher { get; }

        /// <summary> Name of the station which is selected. </summary>
        public IStation SelectedStation { get; set; } = new NullStation();

        /// <summary> Holds the stations availalbe. </summary>
        public IEnumerable<IStation> Stations { get; set; } = new List<Station.Station>();

        public IResourceUrls ResourceUrls { get; set; } = new ResourceUrls();

        /// <summary> Action to post to GUI thread.</summary>
        public Action<SendOrPostCallback, object> PostAction { get; }

        /// <summary> Function which creates a connector depending on connected status.</summary>
        private Func<bool, Uri, string /*userAgent*/, string /*sessionCookie*/, TimeSpan, IConnector> ConnectorFactory { get; }

        /// <summary> Holds the object which provides offline data.</summary>
        private IFilteredConnector m_oConnector;

        /// <summary> Holds the system to copri.</summary>
        public IFilteredConnector GetConnector(bool isConnected)
        {
            if (m_oConnector.IsConnected == isConnected
                && m_oConnector.Command.SessionCookie == ActiveUser.SessionCookie)
            {                
                // Neither connection nor logged in stated changed.
                return m_oConnector;
            }

            // Connected state changed. New connection object has to be created.
            m_oConnector = FilteredConnectorFactory.Create(
                FilterGroupSetting.DoFilter(ActiveUser.DoFilter(GroupFilterMapPage.DoFilter())),
                ConnectorFactory(
                    isConnected, 
                    Uris.ActiveUri,
                    ActiveUser.SessionCookie, 
                    ActiveUser.Mail,
                    ExpiresAfter));

            return m_oConnector;
        }

        /// <summary> Manages the different types of LocksService objects.</summary>
        public LocksServicesContainerMutable LocksServices { get; set; }

        /// <summary> Holds available app themes.</summary>
        public IServicesContainer<IGeolocation> GeolocationServices { get; }

        /// <summary> Manages the different types of LocksService objects.</summary>
        public ServicesContainerMutable<object> Themes { get; }

        /// <summary> Object to switch logging level. </summary>
        private LoggingLevelSwitch m_oLoggingLevelSwitch;

        /// <summary>
        /// Object to allow swithing logging level
        /// </summary>
        public LoggingLevelSwitch Level
        {
            get
            {
                if (m_oLoggingLevelSwitch == null)
                {
                    m_oLoggingLevelSwitch = new LoggingLevelSwitch
                    {

                        // Set warning level to error.
                        MinimumLevel = Settings.Settings.DEFAULTLOGGINLEVEL
                    };
                }

                return m_oLoggingLevelSwitch;
            }
        }

        /// <summary> Updates logging level. </summary>
        /// <param name="p_oNewLevel">New level to set.</param>
        public void UpdateLoggingLevel(LogEventLevel p_oNewLevel)
        {
            if (Level.MinimumLevel == p_oNewLevel)
            {
                // Nothing to do.
                return;
            }

            Log.CloseAndFlush(); // Close before modifying logger configuration. Otherwise a sharing vialation occurs.

           Level.MinimumLevel = p_oNewLevel;

            // Update logging
            Log.Logger = new LoggerConfiguration()
                .MinimumLevel.ControlledBy(Level)
                .WriteTo.Debug()
                .WriteTo.File(LogFileParentFolder, Logging.RollingInterval.Session)
                .CreateLogger();
        }
    }
}