/// <summary>
/// Maps the user's preferences onto the specified view model as an asynchronous operation.
/// </summary>
/// <param name="model">The view model to map.</param>
/// <param name="cancellationToken">The cancellation token to use.</param>
/// <returns>
/// A <see cref="Task"/> representing the asynchronous operation to map the view model.
/// </returns>
private async Task MapPreferencesAsync(LinePreferencesViewModel model, CancellationToken cancellationToken)
{
var user = await _userManager.GetUserAsync(User);
if (user == null)
{
_logger?.LogError($"Failed to get user to render preferences.");
return;
}
model.ETag = user.ETag;
model.IsAuthenticated = true;
model.IsLinkedToAlexa = !string.IsNullOrWhiteSpace(user.AlexaToken);
ITflService service = _tflFactory.CreateService();
ICollection <LineInfo> lines = await service.GetLinesAsync(cancellationToken);
MapFavoriteLines(model, lines, user.FavoriteLines);
string updateResult = HttpContext.Request.Query["UpdateSuccess"].FirstOrDefault();
if (!string.IsNullOrEmpty(updateResult))
{
model.UpdateResult = string.Equals(updateResult, bool.TrueString, StringComparison.OrdinalIgnoreCase);
}
}
/// <summary>
/// Maps the user's favorite lines to the specified view model.
/// </summary>
/// <param name="model">The view model to map.</param>
/// <param name="tflLines">The lines reported by the TfL service.</param>
/// <param name="userFavorites">The user's favorite lines.</param>
private void MapFavoriteLines(
LinePreferencesViewModel model,
ICollection <LineInfo> tflLines,
ICollection <string> userFavorites)
{
if (tflLines.Count == 0)
{
_logger?.LogError($"Failed to map TfL lines as there were no values.");
return;
}
foreach (LineInfo line in tflLines)
{
var favorite = new FavoriteLineItem()
{
DisplayName = line.Name,
Id = line.Id,
};
model.AllLines.Add(favorite);
}
model.AllLines
.OrderBy((p) => p.DisplayName, StringComparer.Ordinal)
.ToList();
if (userFavorites?.Count > 0)
{
foreach (var favorite in model.AllLines)
{
favorite.IsFavorite = userFavorites.Contains(favorite.Id, StringComparer.Ordinal);
}
}
}
public async Task <IActionResult> Index(CancellationToken cancellationToken)
{
var model = new LinePreferencesViewModel();
if (User.Identity.IsAuthenticated)
{
await MapPreferencesAsync(model, cancellationToken);
}
return(View(model));
}
