/// <summary>
/// A recursive method to generate a new username based on the first and last names.
/// </summary>
/// <param name="firstName">The user's first name.</param>
/// <param name="lastName">The user's last name.</param>
/// <param name="userNumber">The number appended to the end of the user's username.</param>
/// <param name="source">A cancellation token source to generate CancellationToken objects as needed.</param>
/// <returns>An awaitable task who's result is the user's username as a string.</returns>
private async Task <string> GenerateUsername(string firstName, string lastName, int userNumber)
{
// First we get their first three of the first and last names (or how many of the letters we can fit if there are less than three).
string userName;
if (lastName.Length < 3)
{
userName = lastName.ToUpper();
}
else
{
userName = lastName.Substring(0, 3).ToUpper();
}
if (firstName.Length < 3)
{
userName += firstName.ToUpper();
}
else
{
userName += firstName.Substring(0, 3).ToUpper();
}
userName += "_" + userNumber.ToString("00"); // The format will always be 01, 02, 03, etc.
// Try to get the user from the database via an API GET call.
try
{
await client.GetUser(userName); // Call the API.
return(await GenerateUsername(firstName, lastName, userNumber + 1)); // If we got someone back, call this function again but with a different user number.
}
catch (ValidationApiException)
{
return(userName); // We got an error? That's actually a good thing. Show them the money!
}
catch (ApiException)
{
return(userName); // Same here. This is the one that will more than likely be the reason we return.
}
}
/// <summary>
/// This is called when the submit button is pressed.
/// </summary>
/// <param name="sender">The object that causes the event.</param>
/// <param name="e">Event arguments.</param>
private async void Submit_Clicked(object sender, EventArgs e)
{
// First, ensure that the user either logged in or they are submitting the request anonymously.
if (!chkAnonymous.IsChecked && !Application.Current.Properties.ContainsKey("Username"))
{
UserDialogs.Instance.Toast(new ToastConfig("You are not logged in! Please log in or check anonymous request and try again.")
{
BackgroundColor = App.toastColor
});
}
// Now, make sure that there is text in the prayer request text area.
else if (txtDescription.Text == null || txtDescription.Text.Equals(string.Empty))
{
UserDialogs.Instance.Toast(new ToastConfig("Prayer request is empty!")
{
BackgroundColor = App.toastColor
});
}
// If they passed those simple validations, call here.
else
{
try
{
// Let the user know we are creating the prayer request.
UserDialogs.Instance.Toast(new ToastConfig("Creating prayer request...")
{
BackgroundColor = App.toastColor, Duration = TimeSpan.FromMilliseconds(App.timeoutTime)
});
// Build the actual prayer request model using the information provided.
Models.PrayerRequest prayerRequest = new Models.PrayerRequest()
{
PrayerDate = DateTime.Now,
PrayerDescription = txtDescription.Text,
UserId = (chkAnonymous.IsChecked ? -1 : (await client.GetUser(Application.Current.Properties["Username"].ToString())).UserId) // If anonymous is selected, use the -1 user ID (the special anonymous user).
};
await client.CreatePrayerRequest(prayerRequest); // Actually post the new prayer request.
// Let the user know the request was created.
UserDialogs.Instance.Toast(new ToastConfig("Prayer request posted!")
{
BackgroundColor = App.toastColor
});
// Reset the form.
txtDescription.Text = "";
chkAnonymous.IsChecked = false;
}
catch (Refit.ValidationApiException) // Bad input.
{
UserDialogs.Instance.Toast(new ToastConfig("Database rejected the post! Try again later.")
{
BackgroundColor = App.toastColor
});
}
catch (Refit.ApiException) // User was deleted.
{
UserDialogs.Instance.Toast(new ToastConfig("Database rejected the post! Try again later.")
{
BackgroundColor = App.toastColor
});
}
catch (System.Net.Http.HttpRequestException) // Lost connection.
{
UserDialogs.Instance.Toast(new ToastConfig("Connection blocked! Try again later.")
{
BackgroundColor = App.toastColor
});
}
catch (TaskCanceledException) // Request timed out.
{
UserDialogs.Instance.Toast(new ToastConfig("Request timed out... Try again later.")
{
BackgroundColor = App.toastColor
});
}
}
}