using System;
using System.ComponentModel;
using System.Threading.Tasks;
using Serilog;
using TINK.Model;
using TINK.Model.Device;
using TINK.Model.Services.CopriApi;
using Xamarin.Essentials;
using Xamarin.Forms;
using TINK.Model.Connector;
using TINK.ViewModel.Contact;
namespace TINK.ViewModel.LegalInformation
{
/// Manges the tabbed info page.
public class LegalInformationPageViewModel : INotifyPropertyChanged
{
/// Fired whenever a property changed.
public event PropertyChangedEventHandler PropertyChanged;
/// Holds the name of the host.
private string HostName { get; }
/// Holds value whether 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 GtcResourcePath { 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 query 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 whether site caching is on or off.
/// Agb resource path received from backend.
/// PrivacyHtml resource path received from backend.
/// ImpressHtml resource path received from backend.
/// Delegate to get embedded html resource. Used as fallback if download from web page does not work and cache is empty.
/// Object to query resources urls object from backend if required.
/// Action to update shared resources urls object
public LegalInformationPageViewModel(
string hostName,
string gtcResourcePath,
string privacyResourcePath,
string impressResourcePath,
bool isSiteCachingOn,
Func resourceProvider,
Func queryProvider,
Action updateUrlsAction)
{
HostName = hostName;
GtcResourcePath = gtcResourcePath;
PrivacyResourcePath = privacyResourcePath;
ImpressResourcePath = impressResourcePath;
IsSiteCachingOn = isSiteCachingOn;
QueryProvider = queryProvider;
UpdateUrlsAction = updateUrlsAction;
GtcHtml = new HtmlWebViewSource { Html = "Loading..." };
ResourceProvider = resourceProvider
?? throw new ArgumentException($"Can not instantiate {typeof(LegalInformationPageViewModel)}-object. No resource provider centered.");
}
// Get resource urls object from backend.
public async Task GetUrls()
{
Result stations;
try
{
stations = await QueryProvider().GetBikesAndStationsAsync();
}
catch (Exception ex)
{
Log.ForContext().Error($"Getting resource urls from COPRI failed. {ex.Message}");
return new ResourceUrls();
}
return stations?.GeneralData?.ResourceUrls ?? new ResourceUrls();
}
/// Called when page is shown.
public async void OnAppearing()
{
// 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;
GtcResourcePath = urls.GtcResourcePath;
UpdateUrlsAction(urls); // Update main model to prevent duplicate queries.
}
//set font size for html content (necessary for iOS)
string headerString = "";
// Gets privacy info from server.
async Task GetPrivacy()
{
string GetUriText()
=> $"https://{HostName}/{PrivacyResourcePath}";
if (string.IsNullOrEmpty(PrivacyResourcePath))
{
// Information to access resource is missing
return new HtmlWebViewSource
{
Html = headerString + await Task.FromResult(ViewModelHelper.FromBody("No privacy resource available. Resource path is null or empty."))
};
}
Log.Debug($"Request to open url {GetUriText()} to get privacy info.");
return new HtmlWebViewSource
{
Html = headerString + await ViewModelHelper.GetSource(
GetUriText(), // "site/privacy.html"
IsSiteCachingOn)
};
}
// Gets impress info from server.
async Task GetImpress()
{
string GetUriText()
=> $"https://{HostName}/{ImpressResourcePath}";
if (string.IsNullOrEmpty(ImpressResourcePath))
{
// Information to access resource is missing
return new HtmlWebViewSource
{
Html = headerString + await Task.FromResult(ViewModelHelper.FromBody("No impress resource available. Resource path is null or empty."))
};
}
Log.Debug($"Request to open url {GetUriText()} to get impress info.");
return new HtmlWebViewSource
{
Html = headerString + await ViewModelHelper.GetSource(
GetUriText(), // "site/privacy.html"
IsSiteCachingOn)
};
}
GtcHtml = await GetGtc(HostName, GtcResourcePath, IsSiteCachingOn);
PrivacyHtml = await GetPrivacy();
ImpressHtml = await GetImpress();
// Set state to idle.
IsIdle = true;
}
/// Gets the AGBs
///
/// AGBs
public static async Task GetGtc(
string hostName,
string gtcResourcePath,
bool isSiteCachingOn)
{
string GetUriText()
=> $"https://{hostName}/{gtcResourcePath}";
//set font size for html content (necessary for iOS)
string headerString = "";
if (string.IsNullOrEmpty(gtcResourcePath))
{
return new HtmlWebViewSource
{
Html = headerString + await Task.FromResult(ViewModelHelper.FromBody("No terms resource available. Resource path is null or empty."))
};
}
Log.Debug($"Request to open url {GetUriText()} to get AGB infos.");
return new HtmlWebViewSource
{
Html = headerString + 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 AppHtml => 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)
};
/// PrivacyHtml text.
private HtmlWebViewSource impressHtml;
/// Gets the privacy related information.
public HtmlWebViewSource ImpressHtml
{
get => impressHtml;
set
{
impressHtml = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ImpressHtml)));
}
}
/// Agb information text.
private HtmlWebViewSource gtcHtml;
/// PrivacyHtml text.
private HtmlWebViewSource privacyHtml;
/// Agb information text.
public HtmlWebViewSource GtcHtml
{
get => gtcHtml;
set
{
gtcHtml = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(GtcHtml)));
}
}
/// Agb information text.
public HtmlWebViewSource PrivacyHtml
{
get => privacyHtml;
set
{
privacyHtml = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(PrivacyHtml)));
}
}
}
}