/// <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>
/// updates a quizinfo in a threaded realm
/// </summary>
/// <param name="editedQuizInfo">quiz to update</param>
/// <param name="threadedRealm">threaded realm to use</param>
private static void EditQuizInfo(QuizInfo editedQuizInfo, Realm threadedRealm)
{
threadedRealm.Write(() =>
{
threadedRealm.Add(editedQuizInfo, update: true);
});
}
/// <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>
/// Handle when user clicks edit button
/// </summary>
private async void ButtonEdit_Clicked(string DBId)
{
QuizInfo info = QuizRosterDatabase.GetQuizInfo(DBId);
if (!CredentialManager.IsLoggedIn)
{
await this.DisplayAlert("Hold on!", "Before you can edit any quizzes, you have to login.", "Ok");
}
else if (info.SyncStatus == (int)SyncStatusEnum.NotDownloadedAndNeedDownload)
{
await this.DisplayAlert("Hold on!", "This quiz isn't on your device, download it before you try to edit it", "Ok");
}
else
{
CreateNewQuizPage quizPage = new CreateNewQuizPage(info); //Create the quizPage
quizPage.SetQuizName(info.QuizName);
Quiz quizDB = new Quiz(info.DBId);
foreach (Question question in quizDB.GetQuestions())
{
quizPage.AddNewQuestion(question);
}
await this.Navigation.PushAsync(quizPage);
}
}
/// <summary>
/// Saves a quizinfo to the roster
/// </summary>
/// <param name="quizInfo">Quizinfo to save</param>
public static void SaveQuizInfo(QuizInfo quizInfo)
{
RealmConfiguration threadConfig = App.realmConfiguration(RosterPath);
Realm realmDB = Realm.GetInstance(threadConfig);
realmDB.Write(() =>
{
realmDB.Add(quizInfo);
});
}
/// <summary>
/// updates a quiz in the roster
/// </summary>
/// <param name="editedQuizInfo">quiz to update</param>
public static void EditQuizInfo(QuizInfo editedQuizInfo)
{
RealmConfiguration threadConfig = App.realmConfiguration(RosterPath);
Realm realmDB = Realm.GetInstance(threadConfig);
realmDB.Write(() =>
{
realmDB.Add(editedQuizInfo, update: true);
});
realmDB.Dispose();
}
/// <summary>
/// Send a quiz to the server with the current user credentials.
/// </summary>
/// <param name="relativeQuizPath">The path to the quiz on the current device.</param>
/// <returns>A bool wrapped in a task representing whether the quiz successfully sent or not.</returns>
public async static Task <bool> SendQuiz(string relativeQuizPath)
{
try
{
string realmFilePath = Directory.GetFiles(App.UserPath + relativeQuizPath, "*.realm").First();
Realm realm = Realm.GetInstance(App.realmConfiguration(realmFilePath));
QuizInfo info = realm.All <QuizInfo>().First();
if (await SendRealmFile(realmFilePath) != OperationReturnMessage.True)
{
throw new Exception();
}
string[] imageFilePaths = Directory.GetFiles(App.UserPath + relativeQuizPath, "*.jpg");
for (int i = 0; i < imageFilePaths.Length; i++)
{
//[0] = path, [1] = fileName, [2] = dBId
string fileName = imageFilePaths[i].Split('/').Last().Split('.').First();
string dbID = info.DBId;
OperationReturnMessage message = await SendImageFile(imageFilePaths[i], fileName, dbID);
if (message == OperationReturnMessage.False)
{
throw new Exception();
}
}
// When finished, confirm with server that quiz send has completed
OperationReturnMessage finalizationMessage = (OperationReturnMessage)SendStringData(
$"{info.DBId}`{info.LastModifiedDate}`{imageFilePaths.Length + 1}`" +
$"{CredentialManager.Username}`{await SecureStorage.GetAsync("password")}`-",
ServerRequestTypes.FinalizeQuizSend);
if (finalizationMessage == OperationReturnMessage.True)
{
QuizInfo infoCopy = new QuizInfo(info)
{
SyncStatus = (int)SyncStatusEnum.Synced
};
QuizRosterDatabase.EditQuizInfo(infoCopy);
return(true);
}
else
{
throw new Exception();
}
}
catch (Exception ex)
{
string test = ex.ToString();
// Alert server that quiz send failed Delete records
return(false);
}
}
/// <summary>
/// Constructing from an already existing quiz
/// </summary>
/// <param name="originalName"> </param>
/// <param name="originalAuthor"> </param>
public CreateNewQuizPage(QuizInfo oldQuizInfo)
{
this.InitializeComponent();
this.SetUpBar();
this.originalCategory = oldQuizInfo.Category;
this.originalAuthor = oldQuizInfo.AuthorName;
this.originalName = oldQuizInfo.QuizName;
this.PickerCategory.SelectedItem = oldQuizInfo.Category;
this.originalQuizInfo = oldQuizInfo;
}
/// <summary>
/// Creates a new QuizInfo based on the information in another
/// </summary>
/// <param name="quizInfoToCopy">The quizInfo to make a copy of</param>
public QuizInfo(QuizInfo quizInfoToCopy)
{
this.DBId = quizInfoToCopy.DBId;
this.AuthorName = quizInfoToCopy.AuthorName;
this.QuizName = quizInfoToCopy.QuizName;
this.Category = quizInfoToCopy.Category;
this.LastModifiedDate = quizInfoToCopy.LastModifiedDate;
this.SyncStatus = quizInfoToCopy.SyncStatus;
this.IsDeletedLocally = quizInfoToCopy.IsDeletedLocally;
this.IsDeletedOnServer = quizInfoToCopy.IsDeletedOnServer;
this.SubscriberCount = quizInfoToCopy.SubscriberCount;
}
/// <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>
/// 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>
/// Saves updates to a quizInfo
/// </summary>
/// <param name="editedQuizInfo">the new version of the quizinfo to save</param>
public void EditQuizInfo(QuizInfo editedQuizInfo)
{
Realm realmDB = Realm.GetInstance(App.realmConfiguration(this.dbPath));
realmDB.Write(() =>
{
realmDB.Add(editedQuizInfo, update: true);
});
QuizInfo rosterCopy = new QuizInfo(editedQuizInfo)
{
SyncStatus = (int)SyncStatusEnum.NeedUpload // Default to 1, meaning "needs upload" in roster
};
QuizRosterDatabase.EditQuizInfo(rosterCopy);
}
/// <summary>
/// Convert List of String arrays containing quiz data (from server) to QuizInfo objects
/// </summary>
/// <param name="quizData"></param>
private static List <QuizInfo> ListOfDataToQuizInfo(List <string[]> quizDatas)
{
List <QuizInfo> toReturn = new List <QuizInfo>();
foreach (string[] quizData in quizDatas)
{
QuizInfo newInfo = new QuizInfo();
newInfo.DBId = quizData[0];
newInfo.AuthorName = quizData[1];
newInfo.QuizName = quizData[2];
newInfo.Category = quizData[3];
newInfo.SubscriberCount = int.Parse(quizData[4]);
toReturn.Add(newInfo);
}
return(toReturn);
}
/// <summary>
/// Called when the user tries to download a quiz
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void SyncDownload_Clicked(object sender, EventArgs e)
{
// this.serverConnected = true;
ImageButton button = sender as ImageButton;
string dbId = button.ClassId;
QuizInfo quizInfo = QuizRosterDatabase.GetQuizInfo(dbId);
// DOES THIS WORK?
while (quizInfo == null && Plugin.Connectivity.CrossConnectivity.Current.IsConnected)
{
await QuizRosterDatabase.UpdateLocalDatabaseAsync();
quizInfo = QuizRosterDatabase.GetQuizInfo(dbId);
}
string authorName = quizInfo.AuthorName;
string quizName = quizInfo.QuizName;
string category = quizInfo.Category;
ActivityIndicator indicatorSyncing = (button.Parent as StackLayout).Children[(int)UISyncStatus.Syncing] as ActivityIndicator;
string quizPath = button.ClassId;
button.IsVisible = false;
indicatorSyncing.IsVisible = true;
indicatorSyncing.IsRunning = true;
if (await Task.Run(() => ServerOperations.GetQuiz(dbId, category)))
{
ImageButton buttonSyncNoChange = (button.Parent as StackLayout).Children[(int)UISyncStatus.NoChange] as ImageButton;
indicatorSyncing.IsVisible = false;
buttonSyncNoChange.IsVisible = true;
(((button.Parent as StackLayout).Parent as StackLayout).Parent as Frame).StyleId = "Local";
}
else // If it failed to download
{
indicatorSyncing.IsVisible = false;
button.IsVisible = true;
await this.DisplayAlert("Quiz Download Failed",
"This quiz could not be downloaded from the server. Please try again.",
"OK");
}
indicatorSyncing.IsRunning = false;
await this.UpdateProfileContentAsync(
this.SelectedCategory);
}
/// <summary>
/// Subscribes to a quiz given the ID
/// </summary>
/// <param name="dbId">the ID of the quiz to sub to</param>
/// <param name="quizzesSearched">the quizzes currently displayed (used to get info about the quiz from the dbid)</param>
/// <returns>If the subscription was successful</returns>
public static async Task <OperationReturnMessage> SubscribeToQuizAsync(string dbId, List <QuizInfo> quizzesSearched)
{
if (QuizRosterDatabase.GetQuizInfo(dbId) == null) // make sure it isn't in yet
{
OperationReturnMessage returnMessage = await Task.Run(async() => await ServerOperations.SubscribeToQuiz(dbId));
if (returnMessage == OperationReturnMessage.True)
{
QuizInfo quiz = quizzesSearched.Where(quizInfo => quizInfo.DBId == dbId).First();
string lastModifiedDate = await Task.Run(() => ServerOperations.GetLastModifiedDate(dbId));
QuizInfo newInfo = new QuizInfo
{
DBId = quiz.DBId,
AuthorName = quiz.AuthorName,
QuizName = quiz.QuizName,
Category = quiz.Category,
LastModifiedDate = lastModifiedDate,
SyncStatus = (int)SyncStatusEnum.NotDownloadedAndNeedDownload // 4 to represent not present in local directory and need download
};
QuizRosterDatabase.SaveQuizInfo(newInfo);
return(returnMessage);
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
CredentialManager.IsLoggedIn = false;
return(returnMessage);
}
else
{
return(returnMessage);
}
}
else
{
return(OperationReturnMessage.False);
}
}
/// <summary>
/// Create a new quizinfo and adds it to the Quiz DB.
/// A copy is stored in the device quiz roster.
/// </summary>
/// <param name="authorName">Author</param>
/// <param name="quizName">Quiz name</param>
/// <param name="category">Category</param>
public void NewQuizInfo(string authorName, string quizName, string category)
{
QuizInfo newQuizInfo = new QuizInfo(authorName, quizName, category)
{
// Sync status is irrelevant in a Quiz Database's copy of the QuizInfo
SyncStatus = -1
};
this.QuizInfo = newQuizInfo;
Realm realmDB = Realm.GetInstance(App.realmConfiguration(this.dbPath));
realmDB.Write(() =>
{
realmDB.Add(newQuizInfo);
});
QuizInfo rosterCopy = new QuizInfo(newQuizInfo)
{
SyncStatus = (int)SyncStatusEnum.NeedUpload // Default to 1, meaning "needs upload" in roster
};
QuizRosterDatabase.SaveQuizInfo(rosterCopy);
}
/// <summary>
/// Handle when user presses "three dot" icon on the quiz tab
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ImageButtonMenu_Clicked(object sender, EventArgs e)
{
string DBId = ((ImageButton)sender).ClassId;
QuizInfo quizInfo = QuizRosterDatabase.GetQuizInfo(DBId);
string quizName = quizInfo.QuizName;
string author = quizInfo.AuthorName;
string deleteText = "Delete";
if (author != CredentialManager.Username)
{
deleteText = "Unsubscribe";
}
string action = await this.DisplayActionSheet(quizName, "Back", null, deleteText, "Edit");
if (action == deleteText)
{
this.ButtonDelete_Clicked(((ImageButton)sender).StyleId, ((ImageButton)sender).ClassId);
}
else if (action == "Edit")
{
this.ButtonEdit_Clicked(DBId);
}
}
/// <summary>
/// Download a quiz from the server.
/// </summary>
/// <param name="dBId">The DBId of the quiz to download</param>
/// <param name="category">The category the quiz belongs in.</param>
/// <returns></returns>
public static bool GetQuiz(string dBId, string category)
{
// TO DO: CHECK IF quizName or category changed and save accordingly
string tempPath = App.UserPath + "/" + "temp" + "/" + dBId + "/";
string tempFilePath = tempPath + "/" + realmFileExtension;
// Store the realm file into a temporary directory in order the retrieve information from it
// (Information regarding the images in order to retrieve them from the server)
Directory.CreateDirectory(tempPath);
byte[] realmFile = (byte[])SendStringData($"{dBId}/-", ServerRequestTypes.GetRealmFile);
if (realmFile.Length > 0)
{
File.WriteAllBytes(tempFilePath, realmFile);
}
else
{
return(false);
}
// Retrieve info regarding the images from the realm file from its temporary location
Realm realmDB = Realm.GetInstance(App.realmConfiguration(tempFilePath));
IQueryable <Question> questionsWithPictures = realmDB.All <Question>().Where(question => question.NeedsPicture);
foreach (Question question in questionsWithPictures)
{
byte[] jpegFile = (byte[])SendStringData($"{question.QuestionId}/{dBId}/-", ServerRequestTypes.GetJPEGImage);
string jpegFilePath = tempPath + "/" + question.QuestionId + jpegFileExtension;
if (jpegFile.Length > 0)
{
File.WriteAllBytes(jpegFilePath, jpegFile);
}
else
{
return(false);
}
}
QuizInfo info = realmDB.All <QuizInfo>().First();
string newQuizName = info.QuizName;
string newCategory = info.Category;
string newLastModfiedDate = info.LastModifiedDate;
string quizPath = info.RelativePath;
string realmFilePath = quizPath + "/" + info.DBId + realmFileExtension;
Directory.CreateDirectory(quizPath);
string[] imageFilePaths = Directory.GetFiles(tempPath, "*.jpg");
string[] realmFilePaths = Directory.GetFiles(tempPath, "*.realm");
foreach (string path in realmFilePaths)
{
File.Copy(path, quizPath + "/" + info.DBId + realmFileExtension, true);
}
foreach (string path in imageFilePaths)
{
string imageName = path.Split('/').Last();
File.Copy(path, quizPath + "/" + imageName, true);
}
if (category != newCategory)
{
DeleteDirectory(info.RelativePath, true);
}
DeleteDirectory(tempPath, true);
QuizInfo infoCopy = new QuizInfo(QuizRosterDatabase.GetQuizInfo(dBId))
{
SyncStatus = (int)SyncStatusEnum.Synced,
QuizName = newQuizName,
Category = newCategory,
LastModifiedDate = newLastModfiedDate
};
QuizRosterDatabase.EditQuizInfo(infoCopy);
return(true);
}
/// <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);
}
}
}
}
/// <summary>
/// Generate a frame (card-like button) for the UI based on a QuizInfo
/// </summary>
/// <param name="quizInfo">QuizInfo of the quiz to generate a frame for</param>
/// <returns></returns>
private Frame GenerateFrame(QuizInfo quizInfo)
{
Frame frame = new Frame()
{
VerticalOptions = LayoutOptions.Start,
HorizontalOptions = LayoutOptions.FillAndExpand,
CornerRadius = 10
};
StackLayout frameStack = new StackLayout // 1st Child of frameLayout
{
FlowDirection = FlowDirection.LeftToRight,
Orientation = StackOrientation.Vertical,
Padding = 10
};
StackLayout topStack = new StackLayout
{
FlowDirection = FlowDirection.LeftToRight,
Orientation = StackOrientation.Horizontal,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand
};
Label title = new Label // 0
{
Text = quizInfo.QuizName,
FontSize = Device.GetNamedSize(NamedSize.Large, typeof(Label)),
FontAttributes = FontAttributes.Bold,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand //,
//HeightRequest = 45
};
topStack.Children.Add(title);
// Add the sync buttons, We create one for each sync action to keep correct formatting and fix a sizing bug.
ImageButton SyncOffline = new ImageButton // 1
{
IsVisible = false,
Source = "ic_cloud_off_black_48dp.png",
HeightRequest = 25,
WidthRequest = 25,
BackgroundColor = Color.White,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
ClassId = quizInfo.DBId,
StyleId = quizInfo.Category
};
SyncOffline.Clicked += this.SyncOffline_Clicked;
topStack.Children.Add(SyncOffline);
ImageButton SyncUpload = new ImageButton // 2
{
IsVisible = false,
Source = "ic_cloud_upload_black_48dp.png",
HeightRequest = 25,
WidthRequest = 25,
BackgroundColor = Color.White,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
ClassId = quizInfo.DBId,
StyleId = quizInfo.Category
};
SyncUpload.Clicked += this.SyncUpload_Clicked;
topStack.Children.Add(SyncUpload);
ImageButton SyncDownload = new ImageButton // 3
{
IsVisible = false,
Source = "ic_cloud_download_black_48dp.png",
HeightRequest = 25,
WidthRequest = 25,
BackgroundColor = Color.White,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
ClassId = quizInfo.DBId,
StyleId = quizInfo.Category
};
SyncDownload.Clicked += this.SyncDownload_Clicked;
topStack.Children.Add(SyncDownload);
ImageButton SyncNoChange = new ImageButton // 4
{
IsVisible = false,
Source = "ic_cloud_done_black_48dp.png",
HeightRequest = 25,
WidthRequest = 25,
BackgroundColor = Color.White,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
ClassId = quizInfo.DBId,
StyleId = quizInfo.Category
};
SyncNoChange.Clicked += this.SyncNoChange_Clicked;
topStack.Children.Add(SyncNoChange);
ActivityIndicator Syncing = new ActivityIndicator // 5
{
IsVisible = false,
Color = Color.Accent,
HeightRequest = 25,
WidthRequest = 25,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
};
topStack.Children.Add(Syncing);
ImageButton imageButtonMenu = new ImageButton // 6
{
Source = "ic_more_vert_black_48dp.png",
HeightRequest = 35,
WidthRequest = 35,
BackgroundColor = Color.White,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
ClassId = quizInfo.DBId
};
imageButtonMenu.Clicked += this.ImageButtonMenu_Clicked;
topStack.Children.Add(imageButtonMenu);
if (CredentialManager.Username == quizInfo.AuthorName)
{
imageButtonMenu.StyleId = "Delete";
}
else
{
imageButtonMenu.StyleId = "Unsubscribe";
}
frameStack.Children.Add(topStack);
BoxView Seperator = new BoxView // 1
{
Color = Color.LightGray,
CornerRadius = 1,
HeightRequest = 2,
WidthRequest = Application.Current.MainPage.Width - 75,
HorizontalOptions = LayoutOptions.CenterAndExpand,
VerticalOptions = LayoutOptions.CenterAndExpand
};
frameStack.Children.Add(Seperator);
Label Author = new Label // 2
{
Text = "Created by: " + quizInfo.AuthorName,
FontSize = Device.GetNamedSize(NamedSize.Medium, typeof(Label)),
VerticalOptions = LayoutOptions.End,
HorizontalOptions = LayoutOptions.StartAndExpand
};
frameStack.Children.Add(Author);
// The sync button thats active in the current frame
ImageButton activeSync;
if (quizInfo.SyncStatus == (int)SyncStatusEnum.Offline) // SyncOffline
{
SyncOffline.IsVisible = true;
activeSync = SyncOffline;
}
else if (quizInfo.SyncStatus == (int)SyncStatusEnum.Synced) // SyncNoChange
{
SyncNoChange.IsVisible = true;
activeSync = SyncNoChange;
}
else if (quizInfo.SyncStatus == (int)SyncStatusEnum.NeedUpload && quizInfo.AuthorName == CredentialManager.Username) // SyncUpload
{
SyncUpload.IsVisible = true;
activeSync = SyncUpload;
}
else if (quizInfo.SyncStatus == (int)SyncStatusEnum.NeedDownload ||
quizInfo.SyncStatus == (int)SyncStatusEnum.NotDownloadedAndNeedDownload) // SyncDownload
{
SyncDownload.IsVisible = true;
activeSync = SyncDownload;
if (quizInfo.SyncStatus == (int)SyncStatusEnum.NotDownloadedAndNeedDownload) // Sync Download & notLocal yet
{
frame.StyleId = "notLocal";
}
}
else
{
SyncOffline.IsVisible = true;
activeSync = SyncOffline;
}
TapGestureRecognizer recognizer = new TapGestureRecognizer();
recognizer.Tapped += async(object sender, EventArgs e) =>
{
if (frame.StyleId != "notLocal")
{
frame.GestureRecognizers.Remove(recognizer);
frame.BackgroundColor = Color.LightGray;
Seperator.Color = Color.Gray;
imageButtonMenu.BackgroundColor = Color.LightGray;
activeSync.BackgroundColor = Color.LightGray;
// Load the quiz associated with this DBId
Quiz newQuiz = new Quiz(quizInfo.DBId);
//await this.RemoveMenu(frameMenu);
await this.Navigation.PushAsync(new Game(newQuiz));
frame.BackgroundColor = Color.Default;
Seperator.Color = Color.LightGray;
imageButtonMenu.BackgroundColor = Color.White;
activeSync.BackgroundColor = Color.White;
frame.GestureRecognizers.Add(recognizer);
}
else
{
await this.DisplayAlert("Hold on!", "In order to study with this quiz, you must download it first", "OK");
}
};
frame.GestureRecognizers.Add(recognizer);
frame.Content = frameStack;
return(frame);
}
/// <summary>
/// Saves the user created quiz
/// </summary>
/// <param name="sender"> </param>
/// <param name="e"> </param>
private async void ButtonCreateQuiz_Clicked(object sender, EventArgs e)
{
this.Done.IsEnabled = false;
if (string.IsNullOrWhiteSpace(this.EditorQuizName.Text))
{
await this.DisplayAlert("Couldn't Create Quiz", "Please give your quiz a name.", "OK");
}
else if (this.StackLayoutQuestionStack.Children.Count < 2)
{
await this.DisplayAlert("Couldn't Create Quiz", "Please create at least two questions", "OK");
}
else if (this.PickerCategory.SelectedIndex == -1)
{
await this.DisplayAlert("Couldn't Create Quiz", "Please give your quiz a category", "OK");
}
else
{
List <Question> previousQuestions = new List <Question>();
List <Question> NewQuestions = new List <Question>(); // A list of questions the user wants to add to the database
// Loops through each question frame on the screen
foreach (Frame frame in this.StackLayoutQuestionStack.Children)
{
// A list of all the children of the current frame
IList <View> children = ((StackLayout)frame.Content).Children;
Question addThis;
//The answers to the question
string[] answers = { ((Editor)children[2]).Text?.Trim(), //Correct answer
((Editor)children[3]).Text?.Trim(), // Incorect answer
((Editor)children[4]).Text?.Trim(), // Incorect answer
((Editor)children[5]).Text?.Trim() }; // Incorect answer
// Checks if there is a question set
if (string.IsNullOrWhiteSpace(((Editor)children[1]).Text))
{
await this.DisplayAlert("Couldn't Create Quiz", "Every question must have a question set", "OK");
goto exit;
}
if (((ImageButton)children[6]).IsVisible) // if the question needs an image
{
addThis = new Question(
((Editor)children[1]).Text?.Trim(), // The Question
((ImageButton)children[6]).Source.ToString().Substring(6), // adds image using the image source
answers)
{
NeedsPicture = true
};
}
else // if the question does not need an image
{
addThis = new Question(
((Editor)children[1]).Text?.Trim(),
answers);
}
string questionType = ((Button)((StackLayout)children[0]).Children[0]).Text;
// Sets the question type
if (questionType == "Question Type: Multiple choice")
{
int size = 0;
foreach (string answer in answers)
{
if (!string.IsNullOrWhiteSpace(answer))
{
size++;
}
}
if (size < 2 || string.IsNullOrWhiteSpace(answers[0]))
{
await this.DisplayAlert("Couldn't Create Quiz", "Mulitple choice questions must have a correct answer and at least one wrong answer", "OK");
goto exit;
}
addThis.QuestionType = 0;
}
else
{
if (string.IsNullOrWhiteSpace(answers[0]))
{
await this.DisplayAlert("Couldn't Create Quiz", "Text answer questions must have an answer", "OK");
goto exit;
}
if (questionType == "Question Type: Text answer")
{
addThis.QuestionType = 1;
}
else
{
addThis.QuestionType = 2;
}
}
addThis.QuestionId = frame.StyleId; // Set the questionId
NewQuestions.Add(addThis);
}
Quiz database;
// If editing their own quiz
if (this.originalQuizInfo != null && this.originalAuthor == CredentialManager.Username)
{
database = new Quiz(this.originalQuizInfo.DBId);
// Set previousQuestions to the correct previous questions
previousQuestions = database.GetQuestions();
}
else // If new quiz
{
database = new Quiz(
CredentialManager.Username,
this.EditorQuizName.Text.Trim(),
this.PickerCategory.Items[this.PickerCategory.SelectedIndex]);
}
// Add if it doesn't already exist, delete if it doesn't exist anymore, update the ones that need to be updated, and do nothing to the others
if (previousQuestions.Count == 0 || originalAuthor != CredentialManager.Username)
{
// if the user created this for the first time
// Save a new QuizInfo into the quiz database, which also adds this QuizInfo to the device quiz roster
database.AddQuestions(NewQuestions.ToArray());
}
else // edit
{
string currentDirectory = database.DBFolderPath;
QuizInfo updatedQuizInfo = new QuizInfo(database.QuizInfo)
{
QuizName = this.EditorQuizName.Text?.Trim(),
LastModifiedDate = DateTime.Now.ToString(),
Category = this.PickerCategory.Items[this.PickerCategory.SelectedIndex]
};
database.EditQuizInfo(updatedQuizInfo);
if (currentDirectory != updatedQuizInfo.RelativePath)
{
Directory.CreateDirectory(updatedQuizInfo.RelativePath);
Directory.Delete(updatedQuizInfo.RelativePath, true);
Directory.Move(currentDirectory, updatedQuizInfo.RelativePath);
}
// Logic for how to save each question.
for (int i = 0; i <= previousQuestions.Count() - 1; i++)
{
bool DBIdSame = true;
// test each old question with each new question
foreach (Question newQuestion in NewQuestions)
{
if (previousQuestions[i].QuestionId == newQuestion.QuestionId)
{
DBIdSame = true;
// the same question, but changed, so update
database.EditQuestion(newQuestion);
NewQuestions.Remove(newQuestion);
break;
}
else
{
DBIdSame = false;
}
}
if (!DBIdSame) // if the question doesn't exist in the new list. delete it
{
database.DeleteQuestions(previousQuestions[i]);
}
}
// Add all the questions that aren't eddited
database.AddQuestions(NewQuestions.ToArray());
}
File.Create(database.DBFolderPath + ".nomedia");
// Returns user to front page of QuizEditor and refreshed database
await this.Navigation.PopAsync(true);
}
exit :;
this.Done.IsEnabled = true;
}
