Version 3.0.342

TINKLib/ViewModel/FeesAndBikes/FeesAndBikesPageViewModel.cs

@@ -1,5 +1,12 @@
-using System.ComponentModel;
+using System;
+using System.ComponentModel;
 using System.Threading.Tasks;
+using Serilog;
+using TINK.Model;
+using TINK.Model.Bikes;
+using TINK.Model.Connector;
+using TINK.Model.Services.CopriApi;
+using TINK.ViewModel.Info;
 using Xamarin.Forms;
 
 namespace TINK.ViewModel.Contact
@@ -12,24 +19,67 @@ namespace TINK.ViewModel.Contact
 		/// <summary> Holds value wether site caching is on or off.</summary>
 		bool IsSiteCachingOn { get; }
 
-		private string FeesResourcePath { get; }
+		/// <summary>
+		/// Relative path to fees resources of empty if value was not yet querried from backend.
+		/// </summary>
+		private string FeesResourcePath { get; set; }
 
-		private string BikesResourcePath { get; }
+		/// <summary>
+		/// Relative path to bike info resources of empty if value was not yet querried from backend.
+		/// </summary>
+		private string BikesResourcePath { get; set; }
 
+		private bool _IsIdle = false;
+
+		/// <summary>
+		/// Is true if no action is pending, false otherwise.
+		/// </summary>
+		public bool IsIdle
+		{
+			get => _IsIdle;
+			private set
+			{
+				if (_IsIdle == value)
+				{
+					// Nothing to do.
+					return;
+				}
+
+				_IsIdle = value;
+				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsIdle)));
+				return;
+			}
+		}
+
+		/// <summary>
+		/// Object to querry resources urls object from backend if required.
+		/// This object is used to update resources path values <see cref="FeesResourcePath"/>, and <see cref="BikesResourcePath"/> from.
+		/// </summary>
+		private Func<IQuery> QueryProvider { get; }
+
+		/// <summary>
+		/// Action to update shared resources urls object exposed by main model. 
+		/// </summary>
+		private Action<IResourceUrls> UpdateUrlsAction { get; }
 
 		/// <summary> Constructs view model.</summary>
 		/// <param name="isSiteCachingOn">Set of user permissions</param>
 		/// <param name="resourceProvider">Delegate to get an an embedded html ressource. Used as fallback if download from web page does not work and cache is empty.</param>
+		/// <param name="query">Object to querry resources path values if required.</param>
 		public FeesAndBikesPageViewModel(
 			string hostName,
 			string feesResourcePath,
 			string bikesResourcePath,
-			bool isSiteCachingOn)
+			bool isSiteCachingOn,
+			Func<IQuery> queryProvider,
+			Action<IResourceUrls> updateUrlsAction)
 		{
 			HostName = hostName;
 			FeesResourcePath = feesResourcePath;
 			BikesResourcePath = bikesResourcePath;
 			IsSiteCachingOn = isSiteCachingOn;
+			QueryProvider = queryProvider;
+			UpdateUrlsAction = updateUrlsAction;
 		}
 
 		/// <summary> Holds the name of the host.</summary>
@@ -38,10 +88,38 @@ namespace TINK.ViewModel.Contact
 		/// <summary> Called when page is shown. </summary>
 		public async void OnAppearing()
 		{
+			// Get resource urls object from backend.
+			async Task<IResourceUrls> GetUrls()
+			{
+				Result<BikeCollection> bikes;
+				try
+				{
+					bikes = await QueryProvider().GetBikesAsync();
+				}
+				catch (Exception ex)
+				{
+					Log.ForContext<FeesAndBikesPageViewModel>().Error($"Getting resource urls from COPRI failed. {ex.Message}");
+					return new ResourceUrls();
+				}
+
+				return bikes?.GeneralData?.ResourceUrls ?? new ResourceUrls();
+			}
+
+			// Set state to busy.
+			IsIdle = false;
+
+			if (string.IsNullOrEmpty(FeesResourcePath))
+			{
+				var urls = await GetUrls();
+				FeesResourcePath = urls.FeesResourcePath;
+				BikesResourcePath = urls.BikesResourcePath;
+				UpdateUrlsAction(urls); // Update main model to prevent duplicate queries.
+			}
+
 			RentBikeText = new HtmlWebViewSource
 			{
 				Html = !string.IsNullOrEmpty(FeesResourcePath)
-					? await ViewModelHelper.GetSource($"https://{HostName}/{FeesResourcePath}" /* "site/tariff_info_1.html" */, IsSiteCachingOn)
+					? await ViewModelHelper.GetSource($"https://{HostName}/{FeesResourcePath}", IsSiteCachingOn)
 					: await Task.FromResult(ViewModelHelper.FromBody("No fees resource available. Resource path is null or empty."))
 			};
 
@@ -51,6 +129,9 @@ namespace TINK.ViewModel.Contact
 					? await ViewModelHelper.GetSource($"https://{HostName}/{BikesResourcePath}" /*"site/bike_info.html"*/, IsSiteCachingOn)
 					: await Task.FromResult(ViewModelHelper.FromBody("No bikes instruction resource available. Resource path is null or empty."))
 			};
+
+			// Set state to idle.
+			IsIdle = true;
 		}
 
 		private HtmlWebViewSource rentBikeText;