"""
/***************************************************************************
Name                 : STDM Database Connection Dialog
Description          : Database connection dialog for only capturing UserName
                        and Port
Date                 : 26/May/2013
copyright            : (C) 2013 by John Gitau
email                : gkahiu@gmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
"""
from qgis.PyQt import uic
from qgis.PyQt.QtGui import (
    QIntValidator
)
from qgis.PyQt.QtWidgets import (
    QDialog,
    QDialogButtonBox,
    QApplication,
    QMessageBox
)

from stdm.data.config import DatabaseConfig
from stdm.data.connection import DatabaseConnection
from stdm.ui.gui_utils import GuiUtils
from stdm.exceptions import DummyException

WIDGET, BASE = uic.loadUiType(
    GuiUtils.get_ui_file_path('ui_dbconn.ui'))


class dbconnDlg(WIDGET, BASE):
    '''
    This dialog captures the database connection properties
    '''

    def __init__(self, parent):
        QDialog.__init__(self, parent)
        self.setupUi(self)

        # gui initialization
        self.initGui()

        # class property
        self.dbconn = None

    def initGui(self):
        '''
        Initialize GUI
        '''
        # Change the name of the OK button to Login
        btnSave = self.btnBox.button(QDialogButtonBox.Ok)
        btnSave.setText(QApplication.translate("DbConnectionDialog", "Save"))

        # Set port integer validator
        intValidator = QIntValidator(1, 60000, self)
        self.txtPort.setValidator(intValidator)

        # Connect slots
        self.btnBox.accepted.connect(self.acceptdlg)

    def validateInput(self):
        '''
        Assert whether required fields have been entered
        '''
        if self.txtHost.text() == "":
            QMessageBox.critical(self, QApplication.translate("DbConnectionDialog", "Required field"),
                                 QApplication.translate("DbConnectionDialog",
                                                        "Database server name/IP cannot be empty"))
            return False
        if self.txtPort.text() == "":
            QMessageBox.critical(self, QApplication.translate("DbConnectionDialog", "Required field"),
                                 QApplication.translate("DbConnectionDialog", "Database port cannot be empty"))
            return False
        if self.txtDatabase.text() == "":
            QMessageBox.critical(self, QApplication.translate("DbConnectionDialog", "Required field"),
                                 QApplication.translate("DbConnectionDialog", "Database name cannot be empty"))
            return False

        else:
            return True

    def acceptdlg(self):
        '''
        On user clicking the login button
        '''
        isValid = self.validateInput()
        if isValid:
            # Capture DB connection properties
            host = self.txtHost.text()
            port = self.txtPort.text()
            database = self.txtDatabase.text()
            dbconfig = DatabaseConfig()
            try:
                self.dbconn = DatabaseConnection(host, port, database)
                # Write DB conn object to the registry
                dbconfig.write(self.dbconn)
            except DummyException as ex:
                QMessageBox.critical(self, QApplication.translate("DbConnectionDialog", "Error saving settings"),
                                     QApplication.translate("DbConnectionDialog", str(ex)))

            self.accept()
