# -*- coding: utf-8 -*-

# Copyright (c) 2009 - 2014 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to enter the connection parameters.
"""

from __future__ import unicode_literals

from PyQt4.QtCore import pyqtSlot
from PyQt4.QtGui import QDialog, QDialogButtonBox
from PyQt4.QtSql import QSqlDatabase

from E5Gui.E5Completers import E5FileCompleter
from E5Gui import E5FileDialog

from .Ui_SqlConnectionDialog import Ui_SqlConnectionDialog

import Utilities
import UI.PixmapCache


class SqlConnectionDialog(QDialog, Ui_SqlConnectionDialog):
    """
    Class implementing a dialog to enter the connection parameters.
    """
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent reference to the parent widget (QWidget)
        """
        super(SqlConnectionDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.databaseFileButton.setIcon(UI.PixmapCache.getIcon("open.png"))
        
        self.databaseFileCompleter = E5FileCompleter()
        
        self.okButton = self.buttonBox.button(QDialogButtonBox.Ok)
        
        drivers = QSqlDatabase.drivers()
        
        # remove compatibility names
        if "QMYSQL3" in drivers:
            drivers.remove("QMYSQL3")
        if "QOCI8" in drivers:
            drivers.remove("QOCI8")
        if "QODBC3" in drivers:
            drivers.remove("QODBC3")
        if "QPSQL7" in drivers:
            drivers.remove("QPSQL7")
        if "QTDS7" in drivers:
            drivers.remove("QTDS7")
        
        self.driverCombo.addItems(drivers)
        
        self.__updateDialog()
        
        msh = self.minimumSizeHint()
        self.resize(max(self.width(), msh.width()), msh.height())
    
    def __updateDialog(self):
        """
        Private slot to update the dialog depending on its contents.
        """
        driver = self.driverCombo.currentText()
        if driver.startswith("QSQLITE"):
            self.databaseEdit.setCompleter(self.databaseFileCompleter)
            self.databaseFileButton.setEnabled(True)
        else:
            self.databaseEdit.setCompleter(None)
            self.databaseFileButton.setEnabled(False)
        
        if self.databaseEdit.text() == "" or driver == "":
            self.okButton.setEnabled(False)
        else:
            self.okButton.setEnabled(True)
    
    @pyqtSlot(str)
    def on_driverCombo_activated(self, txt):
        """
        Private slot handling the selection of a database driver.
        
        @param txt text of the driver combo (string)
        """
        self.__updateDialog()
    
    @pyqtSlot(str)
    def on_databaseEdit_textChanged(self, txt):
        """
        Private slot handling the change of the database name.
        
        @param txt text of the edit (string)
        """
        self.__updateDialog()
    
    @pyqtSlot()
    def on_databaseFileButton_clicked(self):
        """
        Private slot to open a database file via a file selection dialog.
        """
        startdir = self.databaseEdit.text()
        dbFile = E5FileDialog.getOpenFileName(
            self,
            self.tr("Select Database File"),
            startdir,
            self.tr("All Files (*)"))
        
        if dbFile:
            self.databaseEdit.setText(Utilities.toNativeSeparators(dbFile))
    
    def getData(self):
        """
        Public method to retrieve the connection data.
        
        @return tuple giving the driver name (string), the database name
            (string), the user name (string), the password (string), the
            host name (string) and the port (integer)
        """
        return (
            self.driverCombo.currentText(),
            self.databaseEdit.text(),
            self.usernameEdit.text(),
            self.passwordEdit.text(),
            self.hostnameEdit.text(),
            self.portSpinBox.value(),
        )
