# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

###############################################################################
# OpenLP - Open Source Lyrics Projection                                      #
# --------------------------------------------------------------------------- #
# Copyright (c) 2008-2016 OpenLP Developers                                   #
# --------------------------------------------------------------------------- #
# This program is    free software; you can redistribute it and/or modify it     #
# under the terms of the GNU General Public License as published by the Free  #
# Software Foundation; version 2 of the License.                              #
#                                                                             #
# This program is distributed in the hope that it will be useful, but WITHOUT #
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       #
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for    #
# more details.                                                               #
#                                                                             #
# You should have received a copy of the GNU General Public License along     #
# with this program; if not, write to the Free Software Foundation, Inc., 59  #
# Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
###############################################################################
"""
This module contains tests for the openlp.core.lib.listwidgetwithdnd module
"""
from unittest import TestCase

from openlp.core.common.uistrings import UiStrings
from openlp.core.ui.lib.listwidgetwithdnd import ListWidgetWithDnD
from unittest.mock import MagicMock, patch


class TestListWidgetWithDnD(TestCase):
    """
    Test the :class:`~openlp.core.lib.listwidgetwithdnd.ListWidgetWithDnD` class
    """
    def test_clear(self):
        """
        Test the clear method when called without any arguments.
        """
        # GIVEN: An instance of ListWidgetWithDnD
        widget = ListWidgetWithDnD()

        # WHEN: Calling clear with out any arguments
        widget.clear()

        # THEN: The results text should be the standard 'no results' text.
        self.assertEqual(widget.no_results_text, UiStrings().NoResults)

    def test_clear_search_while_typing(self):
        """
        Test the clear method when called with the search_while_typing argument set to True
        """
        # GIVEN: An instance of ListWidgetWithDnD
        widget = ListWidgetWithDnD()

        # WHEN: Calling clear with search_while_typing set to True
        widget.clear(search_while_typing=True)

        # THEN: The results text should be the 'short results' text.
        self.assertEqual(widget.no_results_text, UiStrings().ShortResults)

    def test_paint_event(self):
        """
        Test the paintEvent method when the list is not empty
        """
        # GIVEN: An instance of ListWidgetWithDnD with a mocked out count methode which returns 1
        #       (i.e the list has an item)
        widget = ListWidgetWithDnD()
        with patch('openlp.core.ui.lib.listwidgetwithdnd.QtWidgets.QListWidget.paintEvent') as mocked_paint_event, \
                patch.object(widget, 'count', return_value=1), \
                patch.object(widget, 'viewport') as mocked_viewport:
            mocked_event = MagicMock()

            # WHEN: Calling paintEvent
            widget.paintEvent(mocked_event)

            # THEN: The overridden paintEvnet should have been called
            mocked_paint_event.assert_called_once_with(mocked_event)
            self.assertFalse(mocked_viewport.called)

    def test_paint_event_no_items(self):
        """
        Test the paintEvent method when the list is empty
        """
        # GIVEN: An instance of ListWidgetWithDnD with a mocked out count methode which returns 0
        #       (i.e the list is empty)
        widget = ListWidgetWithDnD()
        mocked_painter_instance = MagicMock()
        mocked_qrect = MagicMock()
        with patch('openlp.core.ui.lib.listwidgetwithdnd.QtWidgets.QListWidget.paintEvent') as mocked_paint_event, \
                patch.object(widget, 'count', return_value=0), \
                patch.object(widget, 'viewport'), \
                patch('openlp.core.ui.lib.listwidgetwithdnd.QtGui.QPainter',
                      return_value=mocked_painter_instance) as mocked_qpainter, \
                patch('openlp.core.ui.lib.listwidgetwithdnd.QtCore.QRect', return_value=mocked_qrect):
            mocked_event = MagicMock()

            # WHEN: Calling paintEvent
            widget.paintEvent(mocked_event)

            # THEN: The overridden paintEvnet should have been called, and some text should be drawn.
            mocked_paint_event.assert_called_once_with(mocked_event)
            mocked_qpainter.assert_called_once_with(widget.viewport())
            mocked_painter_instance.drawText.assert_called_once_with(mocked_qrect, 4100, 'No Search Results')