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

##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
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# Copyright (c) 2008-2020 OpenLP Developers                              #
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# 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, either version 3 of the License, or      #
# (at your option) any later version.                                    #
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# This program is distributed in the hope that it will be useful,        #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          #
# GNU General Public License for more details.                           #
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"""
Package to test the openlp.core.ui.themeform package.
"""
from unittest import TestCase
from unittest.mock import MagicMock, patch

from openlp.core.common.registry import Registry
from openlp.core.ui.themeprogressform import ThemeProgressForm
from tests.helpers.testmixin import TestMixin


class TestThemeProgressForm(TestCase, TestMixin):
    """
    Test the functions in the ThemeProgressForm class
    """
    def setUp(self):
        self.setup_application()

    def tearDown(self):
        del self.app

    def _get_theme_progress_form(self):
        """Common code used to create the ThemeProgressForm object"""
        with patch('openlp.core.ui.themeprogressdialog.ThemePreviewRenderer'), \
                patch('openlp.core.ui.themeprogressdialog.UiThemeProgressDialog.setup_ui'):
            form = ThemeProgressForm()
        return form

    def test_init(self):
        """Test that the ThemeProgressForm is created without problems"""
        # GIVEN: ThemeProgressForm class
        # WHEN: An object is instatiated
        # THEN: There is no problem
        self._get_theme_progress_form()

    @patch('openlp.core.ui.themeprogressform.ScreenList')
    @patch('openlp.core.ui.themeprogressform.QtWidgets.QDialog.show')
    def test_show(self, mocked_show, MockScreenList):
        """Test that the ThemeProgressForm is created without problems"""
        # GIVEN: ThemeProgressForm object
        form = self._get_theme_progress_form()
        mocked_screen_list = MagicMock()
        mocked_screen_list.current.display_geometry.width.return_value = 1920
        mocked_screen_list.current.display_geometry.height.return_value = 1080
        MockScreenList.return_value = mocked_screen_list
        form.progress_bar = MagicMock()
        form.theme_preview_layout = MagicMock()

        # WHEN: The show() method is called
        form.show()

        # THEN: The correct display ratio is calculated and the form is shown
        expected_ratio = 16 / 9
        form.progress_bar.setValue.assert_called_once_with(0)
        assert form.ratio == expected_ratio
        assert form.theme_preview_layout.aspect_ratio == expected_ratio
        mocked_show.assert_called_once()

    @patch('openlp.core.ui.themeprogressform.ScreenList')
    @patch('openlp.core.ui.themeprogressform.QtWidgets.QDialog.show')
    def test_show_divide_by_zero(self, mocked_show, MockScreenList):
        """Test that the ThemeProgressForm is created without problems even if there's a divide by zero exception"""
        # GIVEN: ThemeProgressForm object
        form = self._get_theme_progress_form()
        mocked_screen_list = MagicMock()
        mocked_screen_list.current.display_geometry.width.return_value = 1920
        mocked_screen_list.current.display_geometry.height.return_value = 0
        MockScreenList.return_value = mocked_screen_list
        form.progress_bar = MagicMock()
        form.theme_preview_layout = MagicMock()

        # WHEN: The show() method is called
        form.show()

        # THEN: The correct display ratio is calculated and the form is shown
        expected_ratio = 16 / 9
        form.progress_bar.setValue.assert_called_once_with(0)
        assert form.ratio == expected_ratio
        assert form.theme_preview_layout.aspect_ratio == expected_ratio
        mocked_show.assert_called_once()

    def test_get_preview(self):
        """Test that the get_preview() method returns a preview image"""
        # GIVEN: ThemeProgressForm object
        Registry.create()
        mocked_renderer = MagicMock()
        Registry().register('renderer', mocked_renderer)
        test_theme_name = 'Test Theme'
        test_theme_data = {'name': test_theme_name}
        form = self._get_theme_progress_form()
        form.progress_bar = MagicMock(**{'value.return_value': 0})
        form.label = MagicMock()
        form.theme_display = MagicMock(**{'width.return_value': 192, 'generate_preview.return_value': 'preview'})
        form.renderer.width = MagicMock(return_value=1920)

        # WHEN: get_preview() is called
        preview = form.get_preview(test_theme_name, test_theme_data)

        # THEN: All the correct methods should be called and the correct results should be returned
        form.label.setText.assert_called_once_with(test_theme_name)
        form.progress_bar.value.assert_called_once()
        form.progress_bar.setValue.assert_called_once_with(1)
        form.theme_display.width.assert_called_once()
        form.renderer.width.assert_called_once()
        form.theme_display.set_scale.assert_called_once_with(0.1)
        form.theme_display.generate_preview.assert_called_once_with(test_theme_data, generate_screenshot=True)
        assert preview == 'preview'

    def test_theme_list(self):
        # GIVEN: ThemeProgressForm object and theme list
        test_theme_list = ['Theme 1', 'Theme 2']
        form = self._get_theme_progress_form()
        form.progress_bar = MagicMock()

        # WHEN: theme_list is set and get'ed
        form.theme_list = test_theme_list
        theme_list = form.theme_list

        # THEN: The theme list should be correct
        form.progress_bar.setMinimum.assert_called_once_with(0)
        form.progress_bar.setMaximum.assert_called_once_with(2)
        assert theme_list == test_theme_list