# coding: utf-8
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"""Basic tests for ScatterView"""

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "06/03/2018"


import unittest

import numpy

from silx.gui.plot.items import Axis, Scatter
from silx.gui.plot import ScatterView
from silx.gui.plot.test.utils import PlotWidgetTestCase


class TestScatterView(PlotWidgetTestCase):
    """Test of ScatterView widget"""

    def _createPlot(self):
        return ScatterView()

    def test(self):
        """Simple tests"""
        x = numpy.arange(100)
        y = numpy.arange(100)
        value = numpy.arange(100)
        self.plot.setData(x, y, value)
        self.qapp.processEvents()

        data = self.plot.getData()
        self.assertEqual(len(data), 5)
        self.assertTrue(numpy.all(numpy.equal(x, data[0])))
        self.assertTrue(numpy.all(numpy.equal(y, data[1])))
        self.assertTrue(numpy.all(numpy.equal(value, data[2])))
        self.assertIsNone(data[3])  # xerror
        self.assertIsNone(data[4])  # yerror

        # Test access to scatter item
        self.assertIsInstance(self.plot.getScatterItem(), Scatter)

        # Test toolbar actions

        action = self.plot.getScatterToolBar().getXAxisLogarithmicAction()
        action.trigger()
        self.qapp.processEvents()

        maskAction = self.plot.getScatterToolBar().actions()[-1]
        maskAction.trigger()
        self.qapp.processEvents()

        # Test proxy API

        self.plot.resetZoom()
        self.qapp.processEvents()

        scale = self.plot.getXAxis().getScale()
        self.assertEqual(scale, Axis.LOGARITHMIC)

        scale = self.plot.getYAxis().getScale()
        self.assertEqual(scale, Axis.LINEAR)

        title = 'Test ScatterView'
        self.plot.setGraphTitle(title)
        self.assertEqual(self.plot.getGraphTitle(), title)

        self.qapp.processEvents()

        # Reset scatter data

        self.plot.setData(None, None, None)
        self.qapp.processEvents()

        data = self.plot.getData()
        self.assertEqual(len(data), 5)
        self.assertEqual(len(data[0]), 0)  # x
        self.assertEqual(len(data[1]), 0)  # y
        self.assertEqual(len(data[2]), 0)  # value
        self.assertIsNone(data[3])  # xerror
        self.assertIsNone(data[4])  # yerror

    def testAlpha(self):
        """Test alpha transparency in setData"""
        _pts = 100
        _levels = 100
        _fwhm = 50
        x = numpy.random.rand(_pts)*_levels
        y = numpy.random.rand(_pts)*_levels
        value = numpy.random.rand(_pts)*_levels
        x0 = x[int(_pts/2)]
        y0 = x[int(_pts/2)]
        #2D Gaussian kernel
        alpha = numpy.exp(-4*numpy.log(2) * ((x-x0)**2 + (y-y0)**2) / _fwhm**2)

        self.plot.setData(x, y, value, alpha=alpha)
        self.qapp.processEvents()

        alphaData = self.plot.getScatterItem().getAlphaData()
        self.assertTrue(numpy.all(numpy.equal(alpha, alphaData)))
