# -*- coding: utf-8 -*-
"""
Defines unit tests for :mod:`colour.models.rgb.transfer_functions.dcdm`
module.
"""

from __future__ import division, unicode_literals

import numpy as np
import unittest

from colour.models.rgb.transfer_functions import eotf_inverse_DCDM, eotf_DCDM
from colour.utilities import domain_range_scale, ignore_numpy_errors

__author__ = 'Colour Developers'
__copyright__ = 'Copyright (C) 2013-2020 - Colour Developers'
__license__ = 'New BSD License - https://opensource.org/licenses/BSD-3-Clause'
__maintainer__ = 'Colour Developers'
__email__ = 'colour-developers@colour-science.org'
__status__ = 'Production'

__all__ = ['TestEotf_inverse_DCDM', 'TestEotf_DCDM']


class TestEotf_inverse_DCDM(unittest.TestCase):
    """
    Defines :func:`colour.models.rgb.transfer_functions.dcdm.eotf_inverse_DCDM`
    definition unit tests methods.
    """

    def test_eotf_inverse_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.\
dcdm.eotf_inverse_DCDM` definition.
        """

        self.assertAlmostEqual(eotf_inverse_DCDM(0.0), 0.0, places=7)

        self.assertAlmostEqual(eotf_inverse_DCDM(0.18), 0.11281861, places=7)

        self.assertAlmostEqual(eotf_inverse_DCDM(1.0), 0.21817973, places=7)

        self.assertEqual(eotf_inverse_DCDM(0.18, out_int=True), 462)

    def test_n_dimensional_eotf_inverse_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.dcdm.\
eotf_inverse_DCDM` definition n-dimensional arrays support.
        """

        XYZ = 0.18
        XYZ_p = eotf_inverse_DCDM(XYZ)

        XYZ = np.tile(XYZ, 6)
        XYZ_p = np.tile(XYZ_p, 6)
        np.testing.assert_almost_equal(
            eotf_inverse_DCDM(XYZ), XYZ_p, decimal=7)

        XYZ = np.reshape(XYZ, (2, 3))
        XYZ_p = np.reshape(XYZ_p, (2, 3))
        np.testing.assert_almost_equal(
            eotf_inverse_DCDM(XYZ), XYZ_p, decimal=7)

        XYZ = np.reshape(XYZ, (2, 3, 1))
        XYZ_p = np.reshape(XYZ_p, (2, 3, 1))
        np.testing.assert_almost_equal(
            eotf_inverse_DCDM(XYZ), XYZ_p, decimal=7)

    def test_domain_range_scale_eotf_inverse_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.\
dcdm.eotf_inverse_DCDM` definition domain and range scale support.
        """

        XYZ = 0.18
        XYZ_p = eotf_inverse_DCDM(XYZ)

        d_r = (('reference', 1), (1, 1), (100, 100))
        for scale, factor in d_r:
            with domain_range_scale(scale):
                np.testing.assert_almost_equal(
                    eotf_inverse_DCDM(XYZ * factor), XYZ_p * factor, decimal=7)

    @ignore_numpy_errors
    def test_nan_eotf_inverse_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.dcdm.\
eotf_inverse_DCDM` definition nan support.
        """

        eotf_inverse_DCDM(np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))


class TestEotf_DCDM(unittest.TestCase):
    """
    Defines :func:`colour.models.rgb.transfer_functions.dcdm.eotf_DCDM`
    definition unit tests methods.
    """

    def test_eotf_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.dcdm.eotf_DCDM`
        definition.
        """

        self.assertAlmostEqual(eotf_DCDM(0.0), 0.0, places=7)

        self.assertAlmostEqual(eotf_DCDM(0.11281861), 0.18, places=7)

        self.assertAlmostEqual(eotf_DCDM(0.21817973), 1.0, places=7)

        np.testing.assert_allclose(
            eotf_DCDM(462, in_int=True), 0.18, atol=0.00001, rtol=0.00001)

    def test_n_dimensional_eotf_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.dcdm.eotf_DCDM`
        definition n-dimensional arrays support.
        """

        XYZ_p = 0.11281861
        XYZ = eotf_DCDM(XYZ_p)

        XYZ_p = np.tile(XYZ_p, 6)
        XYZ = np.tile(XYZ, 6)
        np.testing.assert_almost_equal(eotf_DCDM(XYZ_p), XYZ, decimal=7)

        XYZ_p = np.reshape(XYZ_p, (2, 3))
        XYZ = np.reshape(XYZ, (2, 3))
        np.testing.assert_almost_equal(eotf_DCDM(XYZ_p), XYZ, decimal=7)

        XYZ_p = np.reshape(XYZ_p, (2, 3, 1))
        XYZ = np.reshape(XYZ, (2, 3, 1))
        np.testing.assert_almost_equal(eotf_DCDM(XYZ_p), XYZ, decimal=7)

    def test_domain_range_scale_eotf_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.dcdm.eotf_DCDM`
        definition domain and range scale support.
        """

        XYZ_p = 0.11281861
        XYZ = eotf_DCDM(XYZ_p)

        d_r = (('reference', 1), (1, 1), (100, 100))
        for scale, factor in d_r:
            with domain_range_scale(scale):
                np.testing.assert_almost_equal(
                    eotf_DCDM(XYZ_p * factor), XYZ * factor, decimal=7)

    @ignore_numpy_errors
    def test_nan_eotf_DCDM(self):
        """
        Tests :func:`colour.models.rgb.transfer_functions.dcdm.eotf_DCDM`
        definition nan support.
        """

        eotf_DCDM(np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))


if __name__ == '__main__':
    unittest.main()
