from    QT              import QtWidgets, QT
import  schema


class Login_Dialog (QtWidgets.QDialog) :

    def __init__ (self, username = "") :
        super ().__init__ ()
        self.setWindowTitle ("Login")
        self.layout = L     = QtWidgets.QFormLayout (self)
        self.user_name      = QtWidgets.QLineEdit ()
        self.password       = QtWidgets.QLineEdit ()
        self.password.setEchoMode (QtWidgets.QLineEdit.Password)
        L.addRow ("Benutzername", self.user_name)
        L.addRow ("Passwort",     self.password)
        layout  = QtWidgets.QHBoxLayout  ()
        login   = QtWidgets.QPushButton  ("Login")
        login.setEnabled                 (False)
        self.error = QtWidgets.QLabel    ("")
        layout.addWidget                 (self.error)
        login.clicked.connect            (self._login)
        layout.addStretch                (10)
        layout.addWidget                 (login)
        login.setDefault                 (True)
        L.addRow                         (layout)
        self.login = login
        self.password.editingFinished.connect (self._login)
        self.user_name.editingFinished.connect(self._check_login_possible)
        self.user_id = None
        self.user_name.setText (username)
        if username :
            self.password.setFocus ()
    # end def __init__
    
    def _check_login_possible (self) :
        un = self.user_name.text ()
        pw = self.password.text ()
        self.login.setEnabled ((len (un) >= 3) and (len (pw) >= 3))
    # end def _check_login_possible
    
    def _login (self) :
        un = self.user_name.text ()
        pw = self.password.text ()
        with schema.orm.db_session :
            user = schema.User.get (username = un)
            if not user :   
                self.error.setText ("User nicht gefunden")
            else :
                if user.check_password (pw) :
                    self.user_id = user.id
                    self.accept ()
                else :
                    self.error.setText ("Passwort falsch")
    # end def _login
    
# end class Login_Dialog