using System;
using System.ComponentModel;
using System.Threading.Tasks;
using Serilog;
using TINK.Model.Bikes;
using TINK.Model;
using TINK.Model.Device;
using TINK.Model.Services.CopriApi;
using Xamarin.Essentials;
using Xamarin.Forms;
using TINK.Model.Connector;
namespace TINK.ViewModel.Info
{
/// Manges the tabbed info page.
public class InfoPageViewModel : INotifyPropertyChanged
{
/// Fired whenever a property changed.
public event PropertyChangedEventHandler PropertyChanged;
/// Holds the name of the host.
private string HostName { get; }
/// Holds value wether site caching is on or off.
bool IsSiteCachingOn { get; }
///
/// Relative path to agb resources of empty if value was not yet querried from backend.
///
private string AgbResourcePath { get; set; }
///
/// Relative path to privacy resources of empty if value was not yet querried from backend.
///
private string PrivacyResourcePath { get; set; }
///
/// Relative path to impress resources of empty if value was not yet querried from backend.
///
private string ImpressResourcePath { get; set; }
private bool _IsIdle = false;
///
/// Is true if no action is pending, false otherwise.
///
public bool IsIdle
{
get => _IsIdle;
private set
{
if (_IsIdle == value)
{
// Nothing to do.
return;
}
_IsIdle = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsIdle)));
return;
}
}
///
/// Object to querry resources urls object from backend if required.
/// This object is used to update resources path values , and from.
///
private Func QueryProvider { get; }
///
/// Action to update shared resources urls object exposed by main model.
///
private Action UpdateUrlsAction { get; }
/// Constructs Info view model
/// Name of the host to get html resources from.
/// Holds value wether site caching is on or off.
/// Agb resouce path received from backend.
/// Privacy resouce path received from backend.
/// Impress resouce path received from backend.
/// Delegate to get an an embedded html ressource. Used as fallback if download from web page does not work and cache is empty.
/// Object to querry resources urls object from backend if required.
/// Action to update shared resources urls object
public InfoPageViewModel(
string hostName,
string agbResourcePath,
string privacyResourcePath,
string impressResourcePath,
bool isSiteCachingOn,
Func resourceProvider,
Func queryProvider,
Action updateUrlsAction)
{
HostName = hostName;
AgbResourcePath = agbResourcePath;
PrivacyResourcePath = privacyResourcePath;
ImpressResourcePath = impressResourcePath;
IsSiteCachingOn = isSiteCachingOn;
QueryProvider = queryProvider;
UpdateUrlsAction = updateUrlsAction;
InfoAgb = new HtmlWebViewSource { Html = "Loading..." };
ResourceProvider = resourceProvider
?? throw new ArgumentException($"Can not instantiate {typeof(InfoPageViewModel)}-object. No ressource provider availalbe.");
}
/// Called when page is shown.
public async void OnAppearing()
{
// Get resource urls object from backend.
async Task GetUrls()
{
Result bikes;
try
{
bikes = await QueryProvider().GetBikesAsync();
}
catch (Exception ex)
{
Log.ForContext().Error($"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.
}
// Gets privacy info from server.
async Task 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 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)
};
}
InfoAgb = await GetAgb(HostName, AgbResourcePath, IsSiteCachingOn);
InfoPrivacy = await GetInfoPrivacy();
InfoImpressum = await GetImpressum();
// Set state to idle.
IsIdle = true;
}
/// Gets the AGBs
///
/// AGBs
public static async Task GetAgb(
string hostName,
string agbResourcePath,
bool isSiteCachingOn)
{
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)
};
}
/// Gets the platfrom specific prefix.
private Func ResourceProvider { get; set; }
/// Gets the app related information (app version and licenses).
public HtmlWebViewSource InfoLicenses => new HtmlWebViewSource
{
Html = ResourceProvider("HtmlResouces.V02.InfoLicenses.html")
.Replace("CURRENT_VERSION_TINKAPP", DependencyService.Get().Version.ToString())
.Replace("ACTIVE_APPNAME", AppInfo.Name)
.Replace("APPSUPPORTMAILADDRESS", ContactPageViewModel.APPSUPPORTMAILADDRESS)
};
/// Privacy text.
private HtmlWebViewSource infoImpress;
/// Gets the privacy related information.
public HtmlWebViewSource InfoImpressum
{
get => infoImpress;
set
{
infoImpress = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoImpressum)));
}
}
/// Agb information text.
private HtmlWebViewSource infoAgb;
/// Privacy text.
private HtmlWebViewSource infoPrivacy;
/// Agb information text.
public HtmlWebViewSource InfoAgb
{
get => infoAgb;
set
{
infoAgb = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoAgb)));
}
}
/// Agb information text.
public HtmlWebViewSource InfoPrivacy
{
get => infoPrivacy;
set
{
infoPrivacy = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoPrivacy)));
}
}
}
}