/// <summary>
/// Handle event when user clicks delete quiz button.
/// </summary>
/// <param name="e"></param>
private async void ButtonDelete_Clicked(string deleteType, string DBId)
{
if (CredentialManager.IsLoggedIn)
{
bool unsubscribe = deleteType == "Unsubscribe";
string question;
string message;
if (unsubscribe)
{
question = "Are you sure you want to unsubscribe?";
message = "This will remove the copy from your device";
}
else
{
question = "Are you sure you want to delete this quiz?";
message = "This will delete the copy on your device and in the cloud. This is not reversable.";
}
bool answer = await this.DisplayAlert(question, message, "Yes", "No");
if (answer)
{
// Acquire QuizInfo from roster
QuizInfo rosterInfo = QuizRosterDatabase.GetQuizInfo(DBId); // Author
string path = rosterInfo.RelativePath;
// 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()
if (CrossConnectivity.Current.IsConnected)
{
OperationReturnMessage returnMessage;
if (unsubscribe)
{
returnMessage = await SubscribeUtils.UnsubscribeFromQuizAsync(DBId);
}
else
{
returnMessage = await ServerOperations.DeleteQuiz(DBId);
}
if (System.IO.Directory.Exists(path))
{
Directory.Delete(path, true);
}
this.Setup();
}
}
}
else
{
await this.DisplayAlert("Hold on!", "You must be create an account or log in before you can unsubscribe", "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();
}
}
/// <summary>
/// Updates the local database by syncing with the server
/// </summary>
/// <returns>an awaitable task for the completion of syncing</returns>
public static async Task UpdateLocalDatabaseAsync()
{
if (App.Path != null && App.UserPath.Length > 2)
{
RealmConfiguration threadConfig = App.realmConfiguration(RosterPath);
Realm threadInstance = Realm.GetInstance(threadConfig);
List <QuizInfo> QuizInfos = new List <QuizInfo>(threadInstance.All <QuizInfo>());
if (CrossConnectivity.Current.IsConnected)
{
for (int i = 0; i < QuizInfos.Count(); i++)
{
if (CredentialManager.IsLoggedIn)
{
if (QuizInfos[i].IsDeletedLocally)
{
if (await ServerOperations.DeleteQuiz(QuizInfos[i].DBId) == OperationReturnMessage.True)
{
string toDeleteDBId = QuizInfos[i].DBId;
QuizInfos.Remove(QuizInfos[i]);
DeleteQuizInfo(toDeleteDBId);
}
}
else if (QuizInfos[i].SyncStatus != (int)SyncStatusEnum.NotDownloadedAndNeedDownload)
{
string lastModifiedDate = ServerOperations.GetLastModifiedDate(QuizInfos[i].DBId);
if (lastModifiedDate == "") // returns empty string could not reach server
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.Offline // 3 represents offline
};
EditQuizInfo(copy, threadInstance);
}
else
{
// Server returns "false" if quiz is not already on the server
if (lastModifiedDate == "false" || lastModifiedDate == null)
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.NeedUpload // 1 represents need upload
};
EditQuizInfo(copy, threadInstance);
}
else
{
DateTime localModifiedDateTime = Convert.ToDateTime(QuizInfos[i].LastModifiedDate);
DateTime serverModifiedDateTime = Convert.ToDateTime(lastModifiedDate);
if (localModifiedDateTime > serverModifiedDateTime)
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.NeedUpload // 1 represents need upload
};
EditQuizInfo(copy, threadInstance);
}
else if (localModifiedDateTime < serverModifiedDateTime)
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.NeedDownload // 0 represents needs download
};
EditQuizInfo(copy, threadInstance);
}
else if (localModifiedDateTime == serverModifiedDateTime)
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.Synced // 2 represents in sync
};
EditQuizInfo(copy, threadInstance);
}
}
}
}
}
else
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.Synced // 2 represents in sync
};
EditQuizInfo(copy, threadInstance);
}
}
string[] dbIds = new string[QuizInfos.Count];
for (int i = 0; i < dbIds.Length; i++)
{
dbIds[i] = QuizInfos[i].DBId;
}
List <string[]> missingQuizs = ServerOperations.GetMissingQuizzesByAuthorName(CredentialManager.Username, dbIds);
foreach (string[] missingQuiz in missingQuizs)
{
QuizInfo info = new QuizInfo
{
DBId = missingQuiz[0],
AuthorName = missingQuiz[1],
QuizName = missingQuiz[2],
Category = missingQuiz[3],
LastModifiedDate = missingQuiz[4],
SubscriberCount = int.Parse(missingQuiz[5]),
SyncStatus = (int)SyncStatusEnum.NotDownloadedAndNeedDownload
};
threadInstance.Write(() =>
{
threadInstance.Add(info);
});
}
}
else
{
for (int i = 0; i < QuizInfos.Count; i++)
{
QuizInfo copy = new QuizInfo(QuizInfos[i])
{
SyncStatus = (int)SyncStatusEnum.Offline // 3 represents offline
};
EditQuizInfo(copy, threadInstance);
}
}
}
}
