using System;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using MonkeyCache.FileStore;
using Serilog;
using ShareeBike.Model.Bikes.BikeInfoNS.BC;
using ShareeBike.Model.Device;
using ShareeBike.Model.State;
using ShareeBike.Model.Stations.StationNS;
using ShareeBike.Model.User;
using ShareeBike.MultilingualResources;
using ShareeBike.Repository;
using ShareeBike.Repository.Exception;
using Xamarin.Forms;

namespace ShareeBike.ViewModel
{
	public static class ViewModelHelper
	{
		/// <summary> First part of text making up a station name.</summary>
		private const string USER_FIENDLY_STATIONNUMBER_PREFIX = "Station";

		/// <summary>Holds the color which marks link to ShareeBike- app pages, web sites, ...</summary>
		public static Color LINK_COLOR = Color.Blue;

		/// <summary>
		/// Gets station name from station object.
		/// </summary>
		/// <param name="station">Station to get id from</param>
		/// <returns></returns>
		public static string GetStationName(this IStation station)
		{
			if (station == null)
			{
				return string.Empty;
			}

			if (!string.IsNullOrEmpty(station.StationName))
			{
				return $"{station.StationName}, Nr. {station.Id}.";
			}

			return GetStationName(station.Id);
		}

		/// <summary>
		/// Gets station name from station object.
		/// </summary>
		/// <param name="p_oStation">Station to get id from</param>
		/// <returns></returns>
		public static string GetStationName(string station)
		{
			return string.Format("{0} {1}", USER_FIENDLY_STATIONNUMBER_PREFIX, station);
		}

		/// <summary>
		/// Gets station id from station name.
		/// </summary>
		/// <param name="p_oStation">Station to get id from</param>
		/// <returns></returns>
		public static int GetStationId(string stationName)
		{
			return int.Parse(stationName.Replace(USER_FIENDLY_STATIONNUMBER_PREFIX, "").Trim());
		}

		/// <summary> Get full display name of a bike which includes id. </summary>
		/// <remarks>
		/// If name is empty return Id as name.
		/// </remarks>
		/// <param name="bike">bike to get name for.</param>
		/// <returns>Display name of bike.</returns>
		public static string GetFullDisplayName(this IBikeInfoMutable bike)
			=> $"{(!string.IsNullOrEmpty(bike.Description) ? $"{bike.Description}, " : string.Empty)}Nr. {bike.Id}";

		/// <summary> Get the display name of a bike. </summary>
		/// <param name="bike">bike to get name for.</param>
		/// <returns>Display name of bike.</returns>
		public static string GetDisplayName(this IBikeInfoMutable bike)
			=> $"{(!string.IsNullOrEmpty(bike.Description) ? $"{bike.Description}" : $"{bike.Id}")}";

		public static string GetDisplayTypeOfBike(this IBikeInfoMutable bike)
			=> $"{(!string.IsNullOrEmpty(bike.Description) ? $"{bike.TypeOfBike}" : $"{bike.Id}")}";
		public static string GetDisplayWheelType(this IBikeInfoMutable bike)
			=> $"{(!string.IsNullOrEmpty(bike.Description) ? $"{bike.WheelType}" : $"{bike.Id}")}";

		/// <summary> Get the display id of a bike.</summary>
		/// <remarks>
		/// If name is empty id is used as name. For this reason return nothing in this case to avoid duplicate output of id.
		/// </remarks>
		/// <param name="bike">bike to get name for.</param>
		/// <returns>Display name of bike.</returns>
		public static string GetDisplayId(this IBikeInfoMutable bike)
			=> $"{(!string.IsNullOrEmpty(bike.Description) ? $"{bike.Id}" : string.Empty)}";

		/// <summary>
		/// Maps state to color.
		/// </summary>
		/// <param name="state"></param>
		/// <returns></returns>
		public static Color GetColor(this InUseStateEnum state)
		{
			switch (state)
			{
				case InUseStateEnum.FeedbackPending:
				case InUseStateEnum.Disposable:
					return Color.Default;

				case InUseStateEnum.Reserved:
					return Color.Orange;

				case InUseStateEnum.Booked:
					return Color.Green;

				default:
					return Color.Default;
			}
		}

		/// <summary> Gets message that logged in user has not booked any bikes. </summary>
		/// <param name="isReportLevelVerbose">Holds whether report level is verbose or not.</param>
		public static string GetShortErrorInfoText(this Exception exception, bool isReportLevelVerbose)
		{
			if (exception == null)
			{
				return string.Empty;
			}

			if (exception is AuthcookieNotDefinedException)
				return AppResources.ActivityTextAuthcookieNotDefinedException;

			if (!isReportLevelVerbose)
			{
				return AppResources.ActivityTextException;
			}

			// An error occurred getting bikes information.
#if USCSHARP9
            switch (exception)
            {
                case WebConnectFailureException:
                    return AppResources.ActivityTextErrorWebConnectFailureException;
                case InvalidResponseException:
                    return AppResources.ActivityTextErrorInvalidResponseException;
                case WebForbiddenException:
                    return AppResources.ActivityTextErrorWebForbiddenException;
                case DeserializationException:
                    return AppResources.ActivityTextErrorDeserializationException;
                case WebException webException:
                        return webException.Status == WebExceptionStatus.ProtocolError && webException.Response is HttpWebResponse webResponse
                            ? string.Format(AppResources.ActivityTextErrorWebExceptionProtocolError, webResponse.StatusDescription)
                            : string.Format(AppResources.ActivityTextErrorWebExceptionGeneralError, webException.Status.ToString());
                default:
                    return AppResources.ActivityTextErrorException;
            }
#else
			if (exception is WebConnectFailureException)
				return AppResources.ActivityTextErrorWebConnectFailureException;
			if (exception is InvalidResponseException)
				return AppResources.ActivityTextErrorInvalidResponseException;
			if (exception is WebForbiddenException)
				return AppResources.ActivityTextErrorWebForbiddenException;
			if (exception is DeserializationException)
				return AppResources.ActivityTextErrorDeserializationException;
			if (exception is WebException webException)
			{
				return webException.Status == WebExceptionStatus.ProtocolError && webException.Response is HttpWebResponse webResponse
					? string.Format(AppResources.ActivityTextErrorWebExceptionProtocolError, webResponse.StatusDescription)
					: string.Format(AppResources.ActivityTextErrorWebExceptionGeneralError, webException.Status.ToString());
			}

			return AppResources.ActivityTextErrorException;
#endif

		}

		/// <summary> Gets error message and handles aggregate exceptions. </summary>
		public static string GetErrorMessage(this Exception exception)
		{
			if (exception == null)
				return string.Empty;

			if (!(exception is AggregateException aggregateException))
				return exception.Message;

			if (aggregateException.InnerExceptions.Count == 1)
				return aggregateException.InnerExceptions[0].Message;

			return new AggregateException().Message + "\r\n" + string.Join("\r\n", aggregateException.InnerExceptions.Select(x => x.Message));
		}

		/// <summary> Gets message that logged in user has not booked any bikes. </summary>
		public static FormattedString GetErrorInfoText(this Exception exception)
		{
			if (exception == null)
			{
				return string.Empty;
			}

			FormattedString l_oError;
			// An error occurred getting bikes information.
			if (exception is WebConnectFailureException)
			{

				l_oError = new FormattedString();
				l_oError.Spans.Add(new Span { Text = "Information!\r\n", FontAttributes = FontAttributes.Bold });
				l_oError.Spans.Add(new Span { Text = $"{exception.Message}\r\n{AppResources.ErrorNoWeb}" });
				return l_oError;

			}
			else if (exception is InvalidResponseException)
			{
				l_oError = new FormattedString();
				l_oError.Spans.Add(new Span { Text = "Fehler, ungültige Serverantwort!\r\n", FontAttributes = FontAttributes.Bold });
				l_oError.Spans.Add(new Span { Text = $"{exception.Message}" });
				return l_oError;
			}
			else if (exception is WebForbiddenException)
			{
				l_oError = new FormattedString();
				l_oError.Spans.Add(new Span { Text = "Beschäftigt... Einen Moment bitte!" });
				return l_oError;
			}

			l_oError = new FormattedString();
			l_oError.Spans.Add(new Span { Text = "Allgemeiner Fehler!\r\n", FontAttributes = FontAttributes.Bold });
			l_oError.Spans.Add(new Span { Text = $"{exception}" });
			return l_oError;
		}

		/// <summary> Gets the user group if a user friendly name.</summary>
		/// <param name="user"></param>
		/// <returns></returns>
		public static string GetUserGroupDisplayName(this User user)
		{
			return string.Join(" & ", user.Group);
		}


		/// <summary> Called when page is shown. </summary>
		/// <param name="resourceUrl">Url to load data from.</param>
		/// <param name="isSiteCachingOn">Holds value whether site caching is on or off.</param>
		/// <param name="resourceProvider"> Provides resource from embedded resources.</param>
		public static async Task<string> GetSource(
			string resourceUrl,
			bool isSiteCachingOn,
			Func<string> resourceProvider = null)
		{
			if (!Barrel.Current.IsExpired(resourceUrl) && isSiteCachingOn)
			{
				// Cached html is still valid and caching is on.
				return Barrel.Current.Get<string>(resourceUrl);
			}

			string htmlContent = string.Empty;

			try
			{
				// Get info from web server.
				htmlContent = await CopriCallsHttps.Get(resourceUrl);
			}
			catch (Exception l_oException)
			{
				// Getting html failed.
				Log.Error($"Requesting {resourceUrl} failed. {l_oException.Message}");
			}

			switch (string.IsNullOrEmpty(htmlContent))
			{
				case true:
					// An error occurred getting resource from web
					htmlContent = Barrel.Current.Exists(resourceUrl)
						? Barrel.Current.Get<string>(key: resourceUrl) // Get from MonkeyCache
						: resourceProvider != null ? resourceProvider() : $"<DOCTYPE html>Error loading {resourceUrl}.";  // Get build in resource.
					break;

				default:
					// Add resource to cache.
					Barrel.Current.Add(key: resourceUrl, data: htmlContent, expireIn: isSiteCachingOn ? TimeSpan.FromDays(1) : TimeSpan.FromMilliseconds(1));
					break;
			}

			return htmlContent ?? FromBody("An error occurred loading html- resource.");
		}

		public static string FromBody(string message) => $"<!DOCTYPE html><html lang=\"de\"><head><title>Error Information</title></head><body>{message}</body></html>";
	}
}