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

# Copyright (c) 2017 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to enter data to insert a hyperlink.
"""

from __future__ import unicode_literals

from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QDialog, QDialogButtonBox

from .Ui_HyperlinkMarkupDialog import Ui_HyperlinkMarkupDialog


class HyperlinkMarkupDialog(QDialog, Ui_HyperlinkMarkupDialog):
    """
    Class implementing a dialog to enter data to insert a hyperlink.
    """
    def __init__(self, textMayBeEmpty, targetMayBeEmpty, noTitle=False,
                 parent=None):
        """
        Constructor
        
        @param textMayBeEmpty flag indicating, that the link text may
            be empty
        @type bool
        @param targetMayBeEmpty flag indicating, that the link target may
            be empty
        @type bool
        @param noTitle flag indicating, that no title is supported
        @type bool
        @param parent reference to the parent widget
        @type QWidget
        """
        super(HyperlinkMarkupDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.__allowEmptyText = textMayBeEmpty
        self.__allowEmptyTarget = targetMayBeEmpty
        
        self.titelEdit.setEnabled(not noTitle)
        
        self.__updateOkButton()
        
        msh = self.minimumSizeHint()
        self.resize(max(self.width(), msh.width()), msh.height())
    
    def __updateOkButton(self):
        """
        Private method to update the state of the OK button.
        """
        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(
            (bool(self.textEdit.text()) or self.__allowEmptyText) and
            (bool(self.targetEdit.text()) or self.__allowEmptyTarget)
        )
    
    @pyqtSlot(str)
    def on_textEdit_textChanged(self, txt):
        """
        Private slot handling a change of the link text.
        
        @param txt link text
        @type str
        """
        self.__updateOkButton()
    
    @pyqtSlot(str)
    def on_targetEdit_textChanged(self, txt):
        """
        Private slot handling a change of the link target.
        
        @param txt link target
        @type str
        """
        self.__updateOkButton()
    
    def getData(self):
        """
        Public method to get the entered data.
        
        @return tuple containing the link text, link target and the optional
            link title
        @rtype tuple of (str, str, str)
        """
        return (
            self.textEdit.text(),
            self.targetEdit.text(),
            self.titelEdit.text()
        )
