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

# Copyright (c) 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to manage registered protocol handlers.
"""

from __future__ import unicode_literals

from PyQt5.QtCore import pyqtSlot, Qt
from PyQt5.QtWidgets import QDialog, QTreeWidgetItem

from .Ui_ProtocolHandlerManagerDialog import Ui_ProtocolHandlerManagerDialog


class ProtocolHandlerManagerDialog(QDialog, Ui_ProtocolHandlerManagerDialog):
    """
    Class implementing a dialog to manage registered protocol handlers.
    """
    def __init__(self, manager, parent=None):
        """
        Constructor
        
        @param manager reference to the protocol handlers manager object
        @type ProtocolHandlerManager
        @param parent reference to the parent widget
        @type QWidget
        """
        super(ProtocolHandlerManagerDialog, self).__init__(parent)
        self.setupUi(self)
        self.setAttribute(Qt.WA_DeleteOnClose)
        
        self.__manager = manager
        handlers = self.__manager.protocolHandlers()
        for scheme in sorted(handlers.keys()):
            QTreeWidgetItem(self.protocolHandlersList,
                            [scheme, handlers[scheme].toString()])
        
        self.on_protocolHandlersList_itemSelectionChanged()
    
    @pyqtSlot()
    def on_protocolHandlersList_itemSelectionChanged(self):
        """
        Private slot handling a change of the selection.
        """
        self.deleteButton.setEnabled(
            len(self.protocolHandlersList.selectedItems()) == 1)
    
    @pyqtSlot()
    def on_deleteButton_clicked(self):
        """
        Private slot to delete the selected protocol handler.
        """
        itm = self.protocolHandlersList.selectedItems()[0]
        self.__manager.removeProtocolHandler(itm.text(0))
        
        self.protocolHandlersList.takeTopLevelItem(
            self.protocolHandlersList.indexOfTopLevelItem(itm))
        del itm
