# coding: utf-8
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"""Test silx.gui.plot.StatsWidget with SceneWidget and ScalarFieldView"""

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "25/01/2019"


import unittest

import numpy

from silx.utils.testutils import ParametricTestCase
from silx.gui.utils.testutils import TestCaseQt
from silx.gui.plot.stats.stats import Stats
from silx.gui import qt

from silx.gui.plot.StatsWidget import BasicStatsWidget

from silx.gui.plot3d.ScalarFieldView import ScalarFieldView
from silx.gui.plot3d.SceneWidget import SceneWidget, items


class TestSceneWidget(TestCaseQt, ParametricTestCase):
    """Tests StatsWidget combined with SceneWidget"""

    def setUp(self):
        super(TestSceneWidget, self).setUp()
        self.sceneWidget = SceneWidget()
        self.sceneWidget.resize(300, 300)
        self.sceneWidget.show()
        self.statsWidget = BasicStatsWidget()
        self.statsWidget.setPlot(self.sceneWidget)
        # self.qWaitForWindowExposed(self.sceneWidget)

    def tearDown(self):
        Stats._getContext.cache_clear()
        self.qapp.processEvents()
        self.sceneWidget.setAttribute(qt.Qt.WA_DeleteOnClose)
        self.sceneWidget.close()
        del self.sceneWidget
        self.statsWidget.setAttribute(qt.Qt.WA_DeleteOnClose)
        self.statsWidget.close()
        del self.statsWidget
        super(TestSceneWidget, self).tearDown()

    def test(self):
        """Test StatsWidget with SceneWidget"""
        # Prepare scene

        # Data image
        image = self.sceneWidget.addImage(numpy.arange(100).reshape(10, 10))
        image.setLabel('Image')
        # RGB image
        imageRGB = self.sceneWidget.addImage(
            numpy.arange(300, dtype=numpy.uint8).reshape(10, 10, 3))
        imageRGB.setLabel('RGB Image')
        # 2D scatter
        data = numpy.arange(100)
        scatter2D = self.sceneWidget.add2DScatter(x=data, y=data, value=data)
        scatter2D.setLabel('2D Scatter')
        # 3D scatter
        scatter3D = self.sceneWidget.add3DScatter(x=data, y=data, z=data, value=data)
        scatter3D.setLabel('3D Scatter')
        # Add a group
        group = items.GroupItem()
        self.sceneWidget.addItem(group)
        # 3D scalar field
        data = numpy.arange(64**3).reshape(64, 64, 64)
        scalarField = items.ScalarField3D()
        scalarField.setData(data, copy=False)
        scalarField.setLabel('3D Scalar field')
        group.addItem(scalarField)

        statsTable = self.statsWidget._getStatsTable()

        # Test selection only
        self.statsWidget.setDisplayOnlyActiveItem(True)
        self.assertEqual(statsTable.rowCount(), 0)

        self.sceneWidget.selection().setCurrentItem(group)
        self.assertEqual(statsTable.rowCount(), 0)

        for item in (image, scatter2D, scatter3D, scalarField):
            with self.subTest('selection only', item=item.getLabel()):
                self.sceneWidget.selection().setCurrentItem(item)
                self.assertEqual(statsTable.rowCount(), 1)
                self._checkItem(item)

        # Test all data
        self.statsWidget.setDisplayOnlyActiveItem(False)
        self.assertEqual(statsTable.rowCount(), 4)

        for item in (image, scatter2D, scatter3D, scalarField):
            with self.subTest('all items', item=item.getLabel()):
                self._checkItem(item)

    def _checkItem(self, item):
        """Check that item is in StatsTable and that stats are OK

        :param silx.gui.plot3d.items.Item3D item:
        """
        if isinstance(item, (items.Scatter2D, items.Scatter3D)):
            data = item.getValueData(copy=False)
        else:
            data = item.getData(copy=False)

        statsTable = self.statsWidget._getStatsTable()
        tableItems = statsTable._itemToTableItems(item)
        self.assertTrue(len(tableItems) > 0)
        self.assertEqual(tableItems['legend'].text(), item.getLabel())
        self.assertEqual(float(tableItems['min'].text()), numpy.min(data))
        self.assertEqual(float(tableItems['max'].text()), numpy.max(data))
        # TODO


class TestScalarFieldView(TestCaseQt):
    """Tests StatsWidget combined with ScalarFieldView"""

    def setUp(self):
        super(TestScalarFieldView, self).setUp()
        self.scalarFieldView = ScalarFieldView()
        self.scalarFieldView.resize(300, 300)
        self.scalarFieldView.show()
        self.statsWidget = BasicStatsWidget()
        self.statsWidget.setPlot(self.scalarFieldView)
        # self.qWaitForWindowExposed(self.sceneWidget)

    def tearDown(self):
        Stats._getContext.cache_clear()
        self.qapp.processEvents()
        self.scalarFieldView.setAttribute(qt.Qt.WA_DeleteOnClose)
        self.scalarFieldView.close()
        del self.scalarFieldView
        self.statsWidget.setAttribute(qt.Qt.WA_DeleteOnClose)
        self.statsWidget.close()
        del self.statsWidget
        super(TestScalarFieldView, self).tearDown()

    def _getTextFor(self, row, name):
        """Returns text in table at given row for column name

        :param int row: Row number in the table
        :param str name: Column id
        :rtype: Union[str,None]
        """
        statsTable = self.statsWidget._getStatsTable()

        for column in range(statsTable.columnCount()):
            headerItem = statsTable.horizontalHeaderItem(column)
            if headerItem.data(qt.Qt.UserRole) == name:
                tableItem = statsTable.item(row, column)
                return tableItem.text()

        return None

    def test(self):
        """Test StatsWidget with ScalarFieldView"""
        data = numpy.arange(64**3, dtype=numpy.float64).reshape(64, 64, 64)
        self.scalarFieldView.setData(data)

        statsTable = self.statsWidget._getStatsTable()

        # Test selection only
        self.statsWidget.setDisplayOnlyActiveItem(True)
        self.assertEqual(statsTable.rowCount(), 1)

        # Test all data
        self.statsWidget.setDisplayOnlyActiveItem(False)
        self.assertEqual(statsTable.rowCount(), 1)

        for column in range(statsTable.columnCount()):
            self.assertEqual(float(self._getTextFor(0, 'min')), numpy.min(data))
            self.assertEqual(float(self._getTextFor(0, 'max')), numpy.max(data))
            sum_ = numpy.sum(data)
            comz = numpy.sum(numpy.arange(data.shape[0]) * numpy.sum(data, axis=(1, 2))) / sum_
            comy = numpy.sum(numpy.arange(data.shape[1]) * numpy.sum(data, axis=(0, 2))) / sum_
            comx = numpy.sum(numpy.arange(data.shape[2]) * numpy.sum(data, axis=(0, 1))) / sum_
            self.assertEqual(self._getTextFor(0, 'COM'), str((comx, comy, comz)))
