fix: Fixed crash on profile import

Fixed #3660. Removed using of GUI class in Profile Importer. Because, it
cannot be used before Nexus instance will be created. As result, it
provide crash in some cases.

src/widget/tool/profileimporter.cpp

@@ -18,34 +18,67 @@
 */
 
 #include "profileimporter.h"
-#include <QString>
-#include <QFile>
-#include <QDir>
+
+#include <QApplication>
 #include <QFileDialog>
-#include <QFileInfo>
-#include "src/persistence/settings.h"
-#include "src/core/core.h"
-#include "src/widget/gui.h"
-#include <QDebug>
 #include <QMessageBox>
+#include <QPushButton>
+
+#include "src/core/core.h"
+#include "src/persistence/settings.h"
+
+/**
+ * @class ProfileImporter
+ * @brief This class provides the ability to import profile.
+ * @note This class can be used before @a Nexus instance will be created,
+ * consequently it can't use @a GUI class. Therefore it should use QMessageBox
+ * to create dialog forms.
+ */
 
 ProfileImporter::ProfileImporter(QWidget *parent) : QWidget(parent)
 {
 
 }
 
+/**
+ * @brief Show a file dialog. Selected file will be imported as Tox profile.
+ * @return True, if the import was succesful. False otherwise.
+ */
 bool ProfileImporter::importProfile()
 {
-    QString path = QFileDialog::getOpenFileName(this,
-                                                tr("Import profile", "import dialog title"),
-                                                QDir::homePath(),
-                                                tr("Tox save file (*.tox)", "import dialog filter"),
-                                                0,
+    QString title = tr("Import profile", "import dialog title");
+    QString filter = tr("Tox save file (*.tox)", "import dialog filter");
+    QString dir = QDir::homePath();
+    QString path = QFileDialog::getOpenFileName(this, title, dir, filter, 0,
                                                 QFileDialog::DontUseNativeDialog);
 
     return importProfile(path);
 }
 
+/**
+ * @brief Asks the user a question with Yes/No choices.
+ * @param title Title of question window.
+ * @param message Text in question window.
+ * @return True if the answer is positive, false otherwise.
+ */
+bool ProfileImporter::askQuestion(QString title, QString message)
+{
+    QMessageBox::Icon icon = QMessageBox::Warning;
+    QMessageBox box(icon, title, message, QMessageBox::NoButton, this);
+    QPushButton* pushButton1 = box.addButton(QApplication::tr("Yes"), QMessageBox::AcceptRole);
+    QPushButton* pushButton2 = box.addButton(QApplication::tr("No"), QMessageBox::RejectRole);
+    box.setDefaultButton(pushButton2);
+    box.setEscapeButton(pushButton2);
+
+    box.exec();
+    return box.clickedButton() == pushButton1;
+}
+
+/**
+ * @brief Try to import Tox profile.
+ * @param path Path to Tox profile.
+ * @return True, if the import was succesful. False otherwise.
+ */
 bool ProfileImporter::importProfile(const QString &path)
 {
     if (path.isEmpty())
@@ -54,8 +87,8 @@ bool ProfileImporter::importProfile(const QString &path)
     QFileInfo info(path);
     if (!info.exists())
     {
-        GUI::showWarning(tr("File doesn't exist"),
-                         tr("Profile doesn't exist"));
+        QMessageBox::warning(this, tr("File doesn't exist"),
+                             tr("Profile doesn't exist"), QMessageBox::Ok);
         return false;
     }
 
@@ -63,18 +96,23 @@ bool ProfileImporter::importProfile(const QString &path)
 
     if (info.suffix() != "tox")
     {
-        GUI::showWarning(tr("Ignoring non-Tox file", "popup title"),
-                         tr("Warning: You have chosen a file that is not a Tox save file; ignoring.", "popup text"));
+        QMessageBox::warning(this, tr("Ignoring non-Tox file", "popup title"),
+                             tr("Warning: You have chosen a file that is not a "
+                                "Tox save file; ignoring.", "popup text"),
+                             QMessageBox::Ok);
         return false; //ingore importing non-tox file
     }
 
-    QString profilePath = QDir(Settings::getInstance().getSettingsDirPath()).filePath(profile + Core::TOX_EXT);
+    QString settingsPath = Settings::getInstance().getSettingsDirPath();
+    QString profilePath = QDir(settingsPath).filePath(profile + Core::TOX_EXT);
 
     if (QFileInfo(profilePath).exists())
     {
         QString title = tr("Profile already exists", "import confirm title");
-        QString message = tr("A profile named \"%1\" already exists. Do you want to erase it?", "import confirm text").arg(profile);
-        bool erase = GUI::askQuestion(title, message);
+        QString message = tr("A profile named \"%1\" already exists. "
+                             "Do you want to erase it?",
+                             "import confirm text").arg(profile);
+        bool erase = askQuestion(title, message);
 
         if (!erase)
             return false; //import canelled
@@ -85,7 +123,9 @@ bool ProfileImporter::importProfile(const QString &path)
     QFile::copy(path, profilePath);
     // no good way to update the ui from here... maybe we need a Widget:refreshUi() function...
     // such a thing would simplify other code as well I believe
-    GUI::showInfo(tr("Profile imported"),
-                  tr("%1.tox was successfully imported").arg(profile));
+    QMessageBox::information(this,  tr("Profile imported"),
+                             tr("%1.tox was successfully imported").arg(profile),
+                             QMessageBox::Ok);
+
     return true; //import successfull
 }

src/widget/tool/profileimporter.h

@@ -31,9 +31,8 @@ public:
     bool importProfile(const QString &path);
     bool importProfile();
 
-signals:
-
-public slots:
+private:
+    bool askQuestion(QString title, QString message);
 };
 
 #endif // PROFILEIMPORTER_H