# coding: utf-8
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from __future__ import absolute_import, division, unicode_literals

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "05/01/2017"


import numpy
import unittest

from silx.gui.plot3d.scene import transform


class TestTransformList(unittest.TestCase):

    def assertSameArrays(self, a, b):
        return self.assertTrue(numpy.allclose(a, b, atol=1e-06))

    def testTransformList(self):
        """Minimalistic test of TransformList"""
        transforms = transform.TransformList()
        refmatrix = numpy.identity(4, dtype=numpy.float32)
        self.assertSameArrays(refmatrix, transforms.matrix)

        # Append translate
        transforms.append(transform.Translate(1., 1., 1.))
        refmatrix = numpy.array(((1., 0., 0., 1.),
                                 (0., 1., 0., 1.),
                                 (0., 0., 1., 1.),
                                 (0., 0., 0., 1.)), dtype=numpy.float32)
        self.assertSameArrays(refmatrix, transforms.matrix)

        # Extend scale
        transforms.extend([transform.Scale(0.1, 2., 1.)])
        refmatrix = numpy.dot(refmatrix,
                              numpy.array(((0.1, 0., 0., 0.),
                                           (0., 2., 0., 0.),
                                           (0., 0., 1., 0.),
                                           (0., 0., 0., 1.)),
                                          dtype=numpy.float32))
        self.assertSameArrays(refmatrix, transforms.matrix)

        # Insert rotate
        transforms.insert(0, transform.Rotate(360.))
        self.assertSameArrays(refmatrix, transforms.matrix)

        # Update translate and check for listener called
        self._callCount = 0

        def listener(source):
            self._callCount += 1
        transforms.addListener(listener)

        transforms[1].tx += 1
        self.assertEqual(self._callCount, 1)
