/// <summary>
/// Unsubscribe from a quiz
/// </summary>
/// <param name="dbId">ID to unsub from</param>
/// <returns>If the unsub was successful</returns>
public static async Task <OperationReturnMessage> UnsubscribeFromQuizAsync(string dbId)
{
QuizInfo info = QuizRosterDatabase.GetQuizInfo(dbId);
if (info.SyncStatus != (int)SyncStatusEnum.NotDownloadedAndNeedDownload)
{
string location = App.UserPath + "/" + info.Category + "/" + info.QuizName + "`" + info.AuthorName;
if (Directory.Exists(location))
{
Directory.Delete(location, true);
}
}
OperationReturnMessage returnMessage = await Task.Run(async() => await ServerOperations.UnsubscribeToQuizAsync(dbId));
if (returnMessage == OperationReturnMessage.True)
{
QuizRosterDatabase.DeleteQuizInfo(dbId);
return(returnMessage);
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
CredentialManager.IsLoggedIn = false;
return(returnMessage);
}
else
{
return(returnMessage);
}
}
/// <summary>
/// When a user wants to unsubscribe from a quiz
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ImageButtonUnsubscribe_Clicked(object sender, EventArgs e)
{
if (CredentialManager.IsLoggedIn)
{
ImageButton button = (sender as ImageButton);
string dbId = button.StyleId;
bool answer = await this.DisplayAlert("Are you sure you want to unsubscribe?", "You will no longer get updates of this quiz", "Yes", "No");
if (answer)
{
ActivityIndicator indicatorSyncing = (button.Parent as StackLayout).Children[(int)SubscribeUtils.SubscribeType.Syncing] as ActivityIndicator;
button.IsVisible = false;
indicatorSyncing.IsVisible = true;
indicatorSyncing.IsRunning = true;
// get rosterInfo
QuizInfo rosterInfo = QuizRosterDatabase.GetQuizInfo(dbId);
// tell the roster that the quiz is deleted
QuizInfo rosterInfoUpdated = new QuizInfo(rosterInfo)
{
IsDeletedLocally = true,
LastModifiedDate = DateTime.Now.ToString()
};
QuizRosterDatabase.EditQuizInfo(rosterInfoUpdated);
OperationReturnMessage returnMessage = await SubscribeUtils.UnsubscribeFromQuizAsync(dbId);
if (returnMessage == OperationReturnMessage.True)
{
(button.Parent as StackLayout).Children[(int)SubscribeUtils.SubscribeType.Subscribe].IsVisible = true; // add in subscribe button
QuizRosterDatabase.DeleteQuizInfo(dbId);
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
button.IsVisible = true;
await this.DisplayAlert("Invalid Credentials", "Your current login credentials are invalid. Please log in and try again.", "OK");
}
else
{
button.IsVisible = true;
await this.DisplayAlert("Unsubscribe Failed", "The unsubscription request could not be completed. Please try again.", "OK");
}
indicatorSyncing.IsVisible = false;
indicatorSyncing.IsRunning = false;
}
}
else
{
await this.DisplayAlert("Hold on!", "Before you can subscribe to any quizzes, you have to login.", "Ok");
}
}
/// <summary>
/// Deletes the quiz from the roster
/// </summary>
private async Task ButtonDelete_Clicked(string DBId)
{
bool answer = await this.DisplayAlert("Are you sure you want to delete this quiz?", "This will delete the copy on your device and in the cloud. This is not reversable.", "Yes", "No");
if (answer)
{
// Acquire QuizInfo from roster
QuizInfo rosterInfo = QuizRosterDatabase.GetQuizInfo(DBId);
string path = rosterInfo.RelativePath;
if (rosterInfo != null)
{
string dbId = rosterInfo.DBId;
// tell the roster that the quiz is deleted
QuizInfo rosterInfoUpdated = new QuizInfo(rosterInfo)
{
IsDeletedLocally = true,
LastModifiedDate = DateTime.Now.ToString()
};
QuizRosterDatabase.EditQuizInfo(rosterInfoUpdated);
// If connected, tell server to delete this quiz If not, it will tell server to delete next time it is connected in QuizRosterDatabase.UpdateLocalDatabase()
OperationReturnMessage returnMessage = await ServerOperations.DeleteQuiz(dbId);
if (returnMessage == OperationReturnMessage.True)
{
QuizRosterDatabase.DeleteQuizInfo(dbId);
}
if (System.IO.Directory.Exists(path))
{
Directory.Delete(path, true);
}
this.QuizNumber.Text =
"You have published a total of " +
await Task.Run(() => ServerOperations.GetNumberOfQuizzesByAuthorName(CredentialManager.Username)) +
" quizzes!";
}
else
{
await DisplayAlert("Could not delete quiz", "This quiz could not be deleted at this time. Please try again later", "OK");
}
// Setup Page again after deletion
await this.UpdateProfilePageAsync();
}
}