Add download db window with connection checks

download_window.py

@@ -0,0 +1,63 @@
+from PyQt5 import uic
+from PyQt5.QtCore import Qt, pyqtSlot
+from PyQt5.QtWidgets import QWidget, QMessageBox
+from download_thread import DownloadThread
+Ui_Download_window, _ = uic.loadUiType("download_db_window.ui")
+
+class DownloadWindow(QWidget, Ui_Download_window):
+    def __init__(self, db_location, data_folder):
+        super().__init__()
+        self.setupUi(self)
+        self.setWindowFlags(
+            #Qt.Window                |
+            Qt.CustomizeWindowHint   |
+            Qt.WindowTitleHint       |
+            Qt.WindowCloseButtonHint #|
+            # Qt.WindowStaysOnTopHint
+        )
+        self.everything_ok = True
+        self.no_internet_msg = QMessageBox(self)
+        self.no_internet_msg.setWindowTitle("No internet connection")
+        self.no_internet_msg.setText("Unable to establish an internet connection")
+        # self.no_internet_msg.buttonClicked.connect(self.close)
+        self.no_internet_msg.finished.connect(self.close)
+
+        self.bad_db_download_msg = QMessageBox(self)
+        self.bad_db_download_msg.setWindowTitle("Something wrong")
+        self.bad_db_download_msg.finished.connect(self.close)
+
+        self.download_thread = DownloadThread(db_location, data_folder)
+        self.download_thread.finished.connect(self.wait_close)
+        self.download_thread.no_connection_error.connect(self.show_no_connection_warning)
+        self.download_thread.bad_db_download_error.connect(self.show_bad_download_warning)
+
+        self.cancel_btn.clicked.connect(self.terminate_process)
+
+    @pyqtSlot()
+    def show_no_connection_warning(self):
+        self.bad_db_download_msg.setText(f"Unable to correctly download the database.\nReason: {self.download_thread.reason}")
+        self.no_internet_msg.show()
+        self.everything_ok = False
+
+    @pyqtSlot()
+    def show_bad_download_warning(self):
+        self.bad_db_download_msg.show()
+        self.everything_ok = False
+
+    @pyqtSlot()
+    def terminate_process(self):
+        if self.download_thread.isRunning():
+            self.download_thread.terminate()
+            self.download_thread.wait()    
+        self.close()
+
+    @pyqtSlot()
+    def wait_close(self):
+        if self.download_thread.regular_execution:
+            self.close() 
+
+    def reject(self):
+        if self.download_thread.isRunning():
+            self.download_thread.terminate()
+            self.download_thread.wait()
+        super().reject()