sharee.bike-App/TINKLib/ViewModel/FeesAndBikes/FeesAndBikesPageViewModel.cs
2022-10-03 17:55:10 +02:00

161 lines
4.6 KiB
C#

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
{
public class FeesAndBikesPageViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
/// <summary> Holds value wether site caching is on or off.</summary>
bool IsSiteCachingOn { get; }
/// <summary>
/// Relative path to fees resources of empty if value was not yet querried from backend.
/// </summary>
private string FeesResourcePath { get; set; }
/// <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,
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>
private string HostName { get; }
/// <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}", IsSiteCachingOn)
: await Task.FromResult(ViewModelHelper.FromBody("No fees resource available. Resource path is null or empty."))
};
TypesOfBikesText = new HtmlWebViewSource
{
Html = !string.IsNullOrEmpty(BikesResourcePath)
? 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;
private HtmlWebViewSource typesOfBikesText;
public HtmlWebViewSource RentBikeText
{
get => rentBikeText;
set
{
rentBikeText = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(RentBikeText)));
}
}
public HtmlWebViewSource TypesOfBikesText
{
get => typesOfBikesText;
set
{
typesOfBikesText = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(TypesOfBikesText)));
}
}
}
}