Enhance stability and error handling across various components

README.md

@@ -35,16 +35,11 @@ Allows authorized users to create, edit, and manage document pages. Support for
 
 ---
 
-## 💡 What's New (v0.2.1) - Stability & Profile Improvements
+## 🛠 What's New (v0.2.16)
 
-This patch release improves reliability and profile editing behavior.
-
-### 🛠 Improved
-
-- Fixed a crash when opening the profile window for accounts without a filled display name.
-- Improved reliability of profile data updates after backend deployment updates.
-- Improved handling of empty values in document and page names.
-- Improved stability of search and document loading in edge cases.
+- Improved toolbar behavior in document edit/create windows.
+- `Duplicate` and `Delete` now only mark a document as changed when pages were actually modified.
+- Reduced accidental “unsaved changes” state when pressing toolbar actions with no selected pages.
 
 ---
 

README_RU.md

@@ -35,16 +35,11 @@
 
 ---
 
-## 💡 Что нового (v0.2.1) - Стабильность и профиль
+## 🛠 Что нового (v0.2.16)
 
-Это патч-обновление повышает надежность и улучшает поведение при работе с профилем.
-
-### 🛠 Улучшено
-
-- Исправлен сбой при открытии профиля для аккаунтов без заполненного отображаемого имени.
-- Повышена надежность обновления данных профиля после обновлений backend-сервиса.
-- Улучшена обработка пустых значений в названиях документов и страниц.
-- Повышена стабильность поиска и загрузки документов в пограничных сценариях.
+- Улучшено поведение панели инструментов в окнах создания и редактирования документа.
+- `Дублировать` и `Удалить` теперь помечают документ как изменённый только при реальном изменении страниц.
+- Снижен риск ложного состояния “есть несохранённые изменения” при нажатии действий без выбранных страниц.
 
 ---
 

api/api_client.py

@@ -539,4 +539,10 @@ def _request(self, method: str, url: str, timeout: int = 10, **kwargs) -> dict:
         request.raise_for_status()
         if request.status_code == 204 or not request.content:
             return {}
-        return request.json()
+        try:
+            return request.json()
+        except ValueError:
+            # Some backends may return 200 with an empty/whitespace body.
+            if not (request.text or "").strip():
+                return {}
+            raise

app.py

@@ -27,7 +27,7 @@
 os.environ.setdefault("QT_SCALE_FACTOR_ROUNDING_POLICY", "PassThrough")
 
 
-APP_VERSION = "0.2.1"
+APP_VERSION = "0.2.16"
 
 class Application:
     """

core/updater.py

@@ -78,6 +78,7 @@ class UpdateDownloader(QThread):
     """Thread for downloading the update file."""
     progress = pyqtSignal(int, int) # downloaded_bytes, total_bytes
     finished = pyqtSignal(str)  # путь к скачанному файлу
+    canceled = pyqtSignal()
     error = pyqtSignal(str)
 
     def __init__(self, url: str, expected_size: int = 0):
@@ -91,6 +92,7 @@ def stop(self):
         self._is_running = False
 
     def run(self):
+        path = None
         try:
             # Use requests context manager to ensure connection closure
             with requests.get(self.url, stream=True, timeout=30, allow_redirects=True) as response:
@@ -121,6 +123,7 @@ def run(self):
                                 os.remove(path)
                             except OSError:
                                 pass
+                            self.canceled.emit()
                             return
 
                         if chunk:
@@ -138,10 +141,24 @@ def run(self):
                                     self.progress.emit(downloaded_size, total_size)
                                     last_emitted_size = downloaded_size
 
-                if self._is_running:
-                    self.finished.emit(path)
+                if not self._is_running:
+                    try:
+                        os.remove(path)
+                    except OSError:
+                        pass
+                    self.canceled.emit()
+                    return
+
+                self.finished.emit(path)
 
         except Exception as e:
+            if path and not self._is_running:
+                try:
+                    os.remove(path)
+                except OSError:
+                    pass
+                self.canceled.emit()
+                return
             logger.error(f"Download failed: {e}")
             self.error.emit(str(e))
 
@@ -193,6 +210,7 @@ def _start_download(self, url, size):
         self._downloader = UpdateDownloader(url, size)
         self._downloader.progress.connect(self.progress_dialog.set_progress)
         self._downloader.finished.connect(self._on_download_finished)
+        self._downloader.canceled.connect(self._on_download_canceled)
         self._downloader.error.connect(self._on_download_error)
 
         self.progress_dialog.canceled.connect(self._downloader.stop)
@@ -201,13 +219,20 @@ def _start_download(self, url, size):
 
     def _on_download_error(self, error_msg):
         self.progress_dialog.close()
+        self._downloader = None
         # If main window is not created yet (check on startup), NotificationService won't work
         if NotificationService().main_window:
             NotificationService().show_toast("error", "Ошибка", f"Ошибка скачивания: {error_msg}")
         else:
             # Use standard QMessageBox as a fallback
             QMessageBox.critical(self.parent_widget, "Ошибка", f"Ошибка скачивания:\n{error_msg}")
 
+    def _on_download_canceled(self):
+        self.progress_dialog.close()
+        self._downloader = None
+        if NotificationService().main_window:
+            NotificationService().show_toast("info", "Обновление", "Скачивание обновления отменено.")
+
     def _on_download_finished(self, file_path):
         # Force set 100% so user sees completion
         self.progress_dialog.set_progress(100, 100)
@@ -216,6 +241,7 @@ def _on_download_finished(self, file_path):
 
     def _show_install_confirmation(self, file_path):
         self.progress_dialog.close()
+        self._downloader = None
         dialog = InstallConfirmDialog(self.parent_widget)
         if dialog.exec_() == QDialog.Accepted:
             self._install_update(file_path)

modules/auth/mvc/auth_controller.py

@@ -96,6 +96,13 @@ def login_user(self, data: dict) -> None:
         try:
             auto_login = self.view.login_page.get_auto_login_state()
             user_id = self.model.save_user(user_data=data, auto_login=auto_login)
+            if not isinstance(user_id, int):
+                NotificationService().show_toast(
+                    "error",
+                    "Ошибка входа",
+                    "Не удалось сохранить сессию. Попробуйте войти снова."
+                )
+                return
 
             self.view.login_page.clear_lineedits()
             self.login_successful.emit("auth", user_id)
@@ -120,6 +127,13 @@ def signup_user(self, user_data: dict) -> None:
         try:
             auto_login = self.view.signup_page.get_auto_login_state()
             user_id = self.model.save_user(user_data=user_data, auto_login=auto_login)
+            if not isinstance(user_id, int):
+                NotificationService().show_toast(
+                    "error",
+                    "Ошибка регистрации",
+                    "Не удалось сохранить сессию. Попробуйте войти снова."
+                )
+                return
 
             self.view.signup_page.clear_lineedits()
 
@@ -154,6 +168,13 @@ def signup(self, data: dict, email: str, password: str) -> None:
             message=f"Код подтверждения отправлен на {email}"
         )
         code = EmailConfirmDialog.get_code(parent=self.auth_window)
+        if not code:
+            NotificationService().show_toast(
+                notification_type="info",
+                title="Подтверждение отменено",
+                message="Регистрация не завершена: код подтверждения не введён."
+            )
+            return
 
         # Create success callback
         success_cb = lambda data: self.signup_user(user_data=data)
@@ -228,6 +249,13 @@ def open_email_confirm_modal_window(self, data, email: str) -> None:
         """
         logging.info(f"Reset password data received: {data}")
         code = EmailConfirmDialog.get_code(parent=self.auth_window)
+        if not code:
+            NotificationService().show_toast(
+                notification_type="info",
+                title="Подтверждение отменено",
+                message="Сброс пароля не завершён: код подтверждения не введён."
+            )
+            return
 
         # Create success callback
         success_cb = lambda data: self.switch_to_reset_password_page(data=data)
@@ -328,10 +356,12 @@ def on_login_page_lineedits_changed(self) -> None:
 
         # Validate email
         if not self.field_validator.validate_email(email=email):
+            self.view.login_page.update_submit_button_state(state=False)
             return
 
         # Validate password
         if not self.field_validator.validate_password(password=password):
+            self.view.login_page.update_submit_button_state(state=False)
             return
 
         # Defining login button state (True if both lineedits has text, else False)
@@ -400,10 +430,12 @@ def on_signup_page_lineedits_changed(self) -> None:
 
         # Validate email
         if not self.field_validator.validate_email(email=email):
+            self.view.signup_page.update_submit_button_state(state=False)
             return
 
         # Validate password
         if not self.field_validator.validate_password(password=password):
+            self.view.signup_page.update_submit_button_state(state=False)
             return
 
         # Check password matching
@@ -491,6 +523,7 @@ def on_reset_password_page_lineedits_changed(self) -> None:
 
         # Validate password
         if not self.field_validator.validate_password(password=password):
+            self.view.forgot_page_reset_password.update_submit_button_state(state=False)
             return
 
         # Check password matching

modules/auth/mvc/auth_model.py

@@ -138,6 +138,9 @@ def save_user(self, user_data: dict, auto_login: bool) -> int | None:
             return None
 
         user_id = user.get("id", None)
+        if not isinstance(user_id, int):
+            logging.error("Cannot save user session: invalid or missing user id.")
+            return None
 
         # Save access and refresh tokens
         self.save_token(token_name=f"access_token_{user_id}", token="access_token", data=user_data)

modules/document_editor/mvc/document_editor_controller.py

@@ -129,8 +129,10 @@ def _on_add_page_button_clicked(self) -> None:
 
     def _on_duplicate_page_button_clicked(self) -> None:
         """Handles the duplicate page button click event."""
-        self.view.duplicate_selected_pages()
-        self._on_document_data_changed()
+        changed = self.view.duplicate_selected_pages()
+        if changed:
+            self._on_document_data_changed()
+        self._on_table_selection_changed()
 
 
     def _on_print_button_clicked(self) -> None:
@@ -250,8 +252,9 @@ def _on_export_button_clicked(self) -> None:
 
     def _on_delete_page_button_clicked(self) -> None:
         """Handles the delete page button click event."""
-        self.view.delete_selected_pages()
-        self._on_document_data_changed()
+        changed = self.view.delete_selected_pages()
+        if changed:
+            self._on_document_data_changed()
         self._on_table_selection_changed()
 
 

modules/document_editor/mvc/document_editor_model.py

@@ -190,11 +190,12 @@ def save_document(self, data: dict) -> None:
 
     def _get_user_token(self) -> str | None:
         last_logged = read_json(self.LOCAL_DIR_LAST_LOGGED)
-
-        if not last_logged:
+        if not isinstance(last_logged, dict):
             return None
 
-        user_id = last_logged["user_id"]
+        user_id = last_logged.get("user_id")
+        if user_id in (None, ""):
+            return None
 
         access_token = keyring.get_password(
             service_name="Documents Exp",
@@ -222,10 +223,12 @@ def _refresh_tokens(self) -> bool:
         """Refreshes tokens using the stored refresh token."""
         try:
             last_logged = read_json(self.LOCAL_DIR_LAST_LOGGED)
-            if not last_logged:
+            if not isinstance(last_logged, dict):
                 return False
 
             user_id = last_logged.get("user_id")
+            if user_id in (None, ""):
+                return False
             refresh_token = keyring.get_password("Documents Exp", f"refresh_token_{user_id}")
 
             if not refresh_token:
@@ -237,4 +240,4 @@ def _refresh_tokens(self) -> bool:
             return True
         except Exception as e:
             logging.error(f"Failed to refresh tokens: {e}")
-            return False
+            return False

modules/document_editor/mvc/document_editor_view.py

@@ -292,8 +292,12 @@ def add_new_page(self) -> None:
         self.table_view.edit(index)
 
 
-    def delete_selected_pages(self) -> None:
-        """Deletes selected or checked pages from the table."""
+    def delete_selected_pages(self) -> bool:
+        """Deletes selected or checked pages from the table.
+
+        Returns:
+            bool: True if any page was deleted, otherwise False.
+        """
         model = self.table_view.model()
         rows_to_delete = set()
 
@@ -313,10 +317,15 @@ def delete_selected_pages(self) -> None:
             model.removeRow(row)
 
         self.table_view.clearSelection()
+        return bool(rows_to_delete)
 
 
-    def duplicate_selected_pages(self) -> None:
-        """Duplicates selected or checked pages."""
+    def duplicate_selected_pages(self) -> bool:
+        """Duplicates selected or checked pages.
+
+        Returns:
+            bool: True if any page was duplicated, otherwise False.
+        """
         model = self.table_view.model()
         rows_to_duplicate = set()
 
@@ -375,6 +384,7 @@ def duplicate_selected_pages(self) -> None:
                 model.index(insert_row, 0), 
                 QItemSelectionModel.Select | QItemSelectionModel.Rows
             )
+        return bool(rows_to_duplicate)
 
 
     def has_selection_or_checks(self) -> bool:
@@ -561,14 +571,22 @@ def has_selected_pages(self) -> bool:
         return self.pages_table.has_selection_or_checks()
 
 
-    def delete_selected_pages(self) -> None:
-        """Deletes selected or checked pages."""
-        self.pages_table.delete_selected_pages()
+    def delete_selected_pages(self) -> bool:
+        """Deletes selected or checked pages.
+
+        Returns:
+            bool: True if any page was deleted, otherwise False.
+        """
+        return self.pages_table.delete_selected_pages()
 
 
-    def duplicate_selected_pages(self) -> None:
-        """Duplicates selected or checked pages."""
-        self.pages_table.duplicate_selected_pages()
+    def duplicate_selected_pages(self) -> bool:
+        """Duplicates selected or checked pages.
+
+        Returns:
+            bool: True if any page was duplicated, otherwise False.
+        """
+        return self.pages_table.duplicate_selected_pages()
 
 
     def get_document_data(self) -> dict:
@@ -811,4 +829,4 @@ def switch_to_files_tab(self) -> None:
         self.ui.tabs_tabWidget.setCurrentIndex(1)
 
     def set_file_drop_active(self, active: bool) -> None:
-        self.files_tab.file_drop_widget.setDragActive(active)
+        self.files_tab.file_drop_widget.setDragActive(active)