sharee.bike-App/TINKLib/ViewModel/Info/InfoViewModel.cs

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C#
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2021-05-13 20:03:07 +02:00
using System;
using System.ComponentModel;
using System.Threading.Tasks;
using TINK.Model.Device;
using TINK.Services.CopriApi.ServerUris;
using Xamarin.Essentials;
using Xamarin.Forms;
namespace TINK.ViewModel.Info
{
/// <summary> Manges the tabbed info page. </summary>
public class InfoViewModel : INotifyPropertyChanged
{
/// <summary> Fired whenever a property changed.</summary>
public event PropertyChangedEventHandler PropertyChanged;
/// <summary> Holds the name of the host.</summary>
private string HostName { get; }
/// <summary> Holds value wether site caching is on or off.</summary>
bool IsSiteCachingOn { get; }
/// <summary> Constructs Info view model</summary>
/// <param name="isSiteCachingOn">Holds value wether site caching is on or off.</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>
public InfoViewModel(
string hostName,
bool isSiteCachingOn,
Func<string, string> resourceProvider)
{
HostName = hostName;
IsSiteCachingOn = isSiteCachingOn;
InfoAgb = new HtmlWebViewSource { Html = "<html>Loading...</html>" };
ResourceProvider = resourceProvider
?? throw new ArgumentException($"Can not instantiate {typeof(InfoViewModel)}-object. No ressource provider availalbe.");
}
/// <summary> Called when page is shown. </summary>
public async void OnAppearing()
{
InfoAgb = await GetAgb(HostName, IsSiteCachingOn, ResourceProvider);
InfoPrivacy = new HtmlWebViewSource
{
Html = await ViewModelHelper.GetSource(
$"https://{HostName}/{HostName.GetPrivacyResource()}",
IsSiteCachingOn,
HostName.GetIsCopri() ? () => ResourceProvider("HtmlResouces.V02.InfoDatenschutz.html") : (Func<string>) null) /* offline resources only available for TINK */,
};
InfoImpressum = new HtmlWebViewSource
{
Html = HostName.GetIsCopri()
? ResourceProvider("HtmlResouces.V02.InfoImpressum.html")
: await ViewModelHelper.GetSource($"https://{HostName}/{CopriHelper.SHAREE_SILTEFOLDERNAME}/impress.html", IsSiteCachingOn)
};
}
/// <summary> Gets the AGBs</summary>
/// <param name="resourceProvider"></param>
/// <returns> AGBs</returns>
public static async Task<HtmlWebViewSource> GetAgb(
string hostName,
bool isSiteCachingOn,
Func<string, string> resourceProvider)
{
return new HtmlWebViewSource
{
Html = await ViewModelHelper.GetSource(
$"https://{hostName}/{hostName.GetAGBResource()}",
isSiteCachingOn,
hostName.GetIsCopri() ? () => resourceProvider("HtmlResouces.V02.InfoAGB.html") : (Func<string>) null) /* offline resources only available for TINK */,
};
}
/// <summary> Gets the platfrom specific prefix. </summary>
private Func<string, string> ResourceProvider { get; set; }
/// <summary> Gets the app related information (app version and licenses). </summary>
public HtmlWebViewSource InfoLicenses => new HtmlWebViewSource
{
Html = ResourceProvider("HtmlResouces.V02.InfoLicenses.html")
.Replace("CURRENT_VERSION_TINKAPP", DependencyService.Get<IAppInfo>().Version.ToString())
.Replace("ACTIVE_APPNAME", AppInfo.Name)
};
/// <summary> Privacy text.</summary>
private HtmlWebViewSource infoImpress;
/// <summary> Gets the privacy related information. </summary>
public HtmlWebViewSource InfoImpressum
{
get => infoImpress;
set
{
infoImpress = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoImpressum)));
}
}
/// <summary> Agb information text.</summary>
private HtmlWebViewSource infoAgb;
/// <summary> Privacy text.</summary>
private HtmlWebViewSource infoPrivacy;
/// <summary> Agb information text.</summary>
public HtmlWebViewSource InfoAgb
{
get => infoAgb;
set
{
infoAgb = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoAgb)));
}
}
/// <summary> Agb information text.</summary>
public HtmlWebViewSource InfoPrivacy
{
get => infoPrivacy;
set
{
infoPrivacy = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoPrivacy)));
}
}
}
}