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

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using System;
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using System.ComponentModel;
using System.Threading.Tasks;
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using Serilog;
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using TINK.Model.Bikes;
using TINK.Model;
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using TINK.Model.Device;
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using TINK.Model.Services.CopriApi;
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using Xamarin.Essentials;
using Xamarin.Forms;
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using TINK.Model.Connector;
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namespace TINK.ViewModel.Info
{
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/// <summary> Manges the tabbed info page. </summary>
public class InfoPageViewModel : 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; }
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/// <summary>
/// Relative path to agb resources of empty if value was not yet querried from backend.
/// </summary>
private string AgbResourcePath { get; set; }
/// <summary>
/// Relative path to privacy resources of empty if value was not yet querried from backend.
/// </summary>
private string PrivacyResourcePath { get; set; }
/// <summary>
/// Relative path to impress resources of empty if value was not yet querried from backend.
/// </summary>
private string ImpressResourcePath { get; set; }
private bool _IsIdle = false;
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/// <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;
}
}
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/// <summary>
/// Object to querry resources urls object from backend if required.
/// This object is used to update resources path values <see cref="AgbResourcePath"/>, <see cref="PrivacyResourcePath"/> and <see cref="ImpressResourcePath"/> from.
/// </summary>
private Func<IQuery> QueryProvider { get; }
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/// <summary>
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/// Action to update shared resources urls object exposed by main model.
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/// </summary>
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private Action<IResourceUrls> UpdateUrlsAction { get; }
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/// <summary> Constructs Info view model</summary>
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/// <param name="hostName">Name of the host to get html resources from.</param>
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/// <param name="isSiteCachingOn">Holds value wether site caching is on or off.</param>
/// <param name="agbResourcePath"> Agb resouce path received from backend.</param>
/// <param name="privacyResourcePath"> Privacy resouce path received from backend.</param>
/// <param name="impressResourcePath"> Impress resouce path received from backend.</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>
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/// <param name="queryProvider">Object to querry resources urls object from backend if required.</param>
/// <param name="updateUrlsAction">Action to update shared resources urls object</param>
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public InfoPageViewModel(
string hostName,
string agbResourcePath,
string privacyResourcePath,
string impressResourcePath,
bool isSiteCachingOn,
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Func<string, string> resourceProvider,
Func<IQuery> queryProvider,
Action<IResourceUrls> updateUrlsAction)
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{
HostName = hostName;
AgbResourcePath = agbResourcePath;
PrivacyResourcePath = privacyResourcePath;
ImpressResourcePath = impressResourcePath;
IsSiteCachingOn = isSiteCachingOn;
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QueryProvider = queryProvider;
UpdateUrlsAction = updateUrlsAction;
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InfoAgb = new HtmlWebViewSource { Html = "<html>Loading...</html>" };
ResourceProvider = resourceProvider
?? throw new ArgumentException($"Can not instantiate {typeof(InfoPageViewModel)}-object. No ressource provider availalbe.");
}
/// <summary> Called when page is shown. </summary>
public async void OnAppearing()
{
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// Get resource urls object from backend.
async Task<IResourceUrls> GetUrls()
{
Result<BikeCollection> bikes;
try
{
bikes = await QueryProvider().GetBikesAsync();
}
catch (Exception ex)
{
Log.ForContext<InfoPageViewModel>().Error($"Getting resource urls from COPRI failed. {ex.Message}");
return new ResourceUrls();
}
IResourceUrls resourceUrls = bikes?.GeneralData?.ResourceUrls ?? new ResourceUrls();
return resourceUrls;
}
// Set state to busy.
IsIdle = false;
// Check if urls to show info from are already known.
if (string.IsNullOrEmpty(PrivacyResourcePath))
{
var urls = await GetUrls();
PrivacyResourcePath = urls.PrivacyResourcePath;
ImpressResourcePath = urls.ImpressResourcePath;
AgbResourcePath = urls.AgbResourcePath;
UpdateUrlsAction(urls); // Update main model to prevent duplicate queries.
}
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// Gets privacy info from server.
async Task<HtmlWebViewSource> GetInfoPrivacy()
{
string GetUriText()
=> $"https://{HostName}/{PrivacyResourcePath}";
if (string.IsNullOrEmpty(PrivacyResourcePath))
{
// Information to access ressource is missing
return new HtmlWebViewSource
{
Html = await Task.FromResult(ViewModelHelper.FromBody("No privacy resource available. Resource path is null or empty."))
};
}
Log.Debug($"Request to open url {GetUriText()} to get privacy info.");
return new HtmlWebViewSource
{
Html = await ViewModelHelper.GetSource(
GetUriText(), // "site/privacy.html"
IsSiteCachingOn)
};
}
// Gets impress info from server.
async Task<HtmlWebViewSource> GetImpressum()
{
string GetUriText()
=> $"https://{HostName}/{ImpressResourcePath}";
if (string.IsNullOrEmpty(ImpressResourcePath))
{
// Information to access ressource is missing
return new HtmlWebViewSource
{
Html = await Task.FromResult(ViewModelHelper.FromBody("No impress resource available. Resource path is null or empty."))
};
}
Log.Debug($"Request to open url {GetUriText()} to get impress info.");
return new HtmlWebViewSource
{
Html = await ViewModelHelper.GetSource(
GetUriText(), // "site/privacy.html"
IsSiteCachingOn)
};
}
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InfoAgb = await GetAgb(HostName, AgbResourcePath, IsSiteCachingOn);
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InfoPrivacy = await GetInfoPrivacy();
InfoImpressum = await GetImpressum();
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// Set state to idle.
IsIdle = true;
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}
/// <summary> Gets the AGBs</summary>
/// <param name="resourceProvider"></param>
/// <returns> AGBs</returns>
public static async Task<HtmlWebViewSource> GetAgb(
string hostName,
string agbResourcePath,
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bool isSiteCachingOn)
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{
string GetUriText()
=> $"https://{hostName}/{agbResourcePath}";
if (string.IsNullOrEmpty(agbResourcePath))
{
return new HtmlWebViewSource
{
Html = await Task.FromResult(ViewModelHelper.FromBody("No terms resource available. Resource path is null or empty."))
};
}
Log.Debug($"Request to open url {GetUriText()} to get AGB infos.");
return new HtmlWebViewSource
{
Html = await ViewModelHelper.GetSource(
GetUriText(), // "agb.html"
isSiteCachingOn)
};
}
/// <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)
.Replace("APPSUPPORTMAILADDRESS", ContactPageViewModel.APPSUPPORTMAILADDRESS)
};
/// <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)));
}
}
}
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}
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