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

# Copyright (c) 2007 - 2014 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the exporter base class.
"""

from __future__ import unicode_literals

from PyQt4.QtCore import QFileInfo, QObject
from PyQt4.QtGui import QApplication

from E5Gui import E5MessageBox, E5FileDialog

import Utilities


class ExporterBase(QObject):
    """
    Class implementing the exporter base class.
    """
    def __init__(self, editor, parent=None):
        """
        Constructor
        
        @param editor reference to the editor object (QScintilla.Editor.Editor)
        @param parent parent object of the exporter (QObject)
        """
        super(ExporterBase, self).__init__(parent)
        self.editor = editor
    
    def _getFileName(self, filter):
        """
        Protected method to get the file name of the export file from the user.
        
        @param filter the filter string to be used (string). The filter for
            "All Files (*)" is appended by this method.
        @return file name entered by the user (string)
        """
        filter_ = filter
        filter_ += ";;"
        filter_ += QApplication.translate('Exporter', "All Files (*)")
        fn, selectedFilter = E5FileDialog.getSaveFileNameAndFilter(
            self.editor,
            self.tr("Export source"),
            "",
            filter_,
            "",
            E5FileDialog.Options(E5FileDialog.DontConfirmOverwrite))
        
        if fn:
            ext = QFileInfo(fn).suffix()
            if not ext:
                ex = selectedFilter.split("(*")[1].split(")")[0]
                if ex:
                    fn += ex
            if QFileInfo(fn).exists():
                res = E5MessageBox.yesNo(
                    self.editor,
                    self.tr("Export source"),
                    self.tr("<p>The file <b>{0}</b> already exists."
                            " Overwrite it?</p>").format(fn),
                    icon=E5MessageBox.Warning)
                if not res:
                    return ""
            
            fn = Utilities.toNativeSeparators(fn)
        
        return fn
    
    def exportSource(self):
        """
        Public method performing the export.
        
        This method must be overridden by the real exporters.
        
        @exception NotImplementedError raised to indicate that this method
            must be implemented by a subclass
        """
        raise NotImplementedError
