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"""
Unit tests for L2 CAT module.
"""

from __future__ import absolute_import, division, print_function
import ctypes
import unittest

from unittest.mock import MagicMock, patch

from pqos.test.helper import ctypes_ref_set_int, ctypes_build_array

from pqos.l2ca import PqosCatL2
from pqos.native_struct import CPqosL2Ca, CPqosL2CaMask


class TestPqosCatL2(unittest.TestCase):
    "Tests for PqosCatL2 class."

    def test_cos_no_masks(self):
        "Tests PqosCatL2.COS class construction when no masks are given."

        with self.assertRaises(ValueError):
            PqosCatL2.COS(1)

    @patch('pqos.l2ca.Pqos')
    def test_set(self, pqos_mock_cls):
        "Tests set() method."

        def pqos_l2ca_set_mock(socket, num_ca, l2_ca_arr):
            "Mock pqos_l2ca_set()."

            self.assertEqual(socket, 0)
            self.assertEqual(num_ca, 1)

            cos = l2_ca_arr[0]
            self.assertEqual(cos.class_id, 1)
            self.assertEqual(cos.cdp, 1)
            self.assertEqual(cos.u.s.data_mask, 0x1f)
            self.assertEqual(cos.u.s.code_mask, 0x0f)

            return 0

        lib = pqos_mock_cls.return_value.lib
        lib.pqos_l2ca_set = MagicMock(side_effect=pqos_l2ca_set_mock)

        l2ca = PqosCatL2()
        cos = l2ca.COS(1, data_mask='0x1f', code_mask=0x0f)
        l2ca.set(0, [cos])

        lib.pqos_l2ca_set.assert_called_once()

    @patch('pqos.l2ca.Pqos')
    def test_get(self, pqos_mock_cls):
        "Tests get() method."
        # pylint: disable=invalid-name

        def pqos_l2ca_get_mock(socket, cos_num, num_ca_ref, l2cas):
            "Mock pqos_l2ca_get()."

            self.assertEqual(socket, 1)
            self.assertEqual(cos_num, 2)

            cos_c = CPqosL2Ca(class_id=0, u=CPqosL2CaMask(ways_mask=0x01ff))
            cos2_c = CPqosL2Ca(class_id=1, u=CPqosL2CaMask(ways_mask=0x007f))
            cos_arr_c = ctypes_build_array([cos_c, cos2_c])

            ctypes.memmove(l2cas, cos_arr_c, ctypes.sizeof(cos_arr_c))
            ctypes_ref_set_int(num_ca_ref, len(cos_arr_c))

            return 0

        lib = pqos_mock_cls.return_value.lib
        lib.pqos_l2ca_get = MagicMock(side_effect=pqos_l2ca_get_mock)

        l2ca = PqosCatL2()

        with patch('pqos.l2ca.PqosCap') as PqosCapMock:
            PqosCapMock.return_value.get_l2ca_cos_num.return_value = 2
            coses = l2ca.get(1)

        lib.pqos_l2ca_get.assert_called_once()

        self.assertEqual(len(coses), 2)
        self.assertEqual(coses[0].class_id, 0)
        self.assertEqual(coses[0].mask, 0x01ff)
        self.assertEqual(coses[1].class_id, 1)
        self.assertEqual(coses[1].mask, 0x007f)

    @patch('pqos.l2ca.Pqos')
    def test_get_min_cbm_bits(self, pqos_mock_cls):
        "Tests get_min_cbm_bits() method."

        def pqos_l2ca_get_min_cbm_bits_mock(min_cbm_bits_ref):
            "Mock pqos_l2ca_get_min_cbm_bits()."

            ctypes_ref_set_int(min_cbm_bits_ref, 2)
            return 0

        lib = pqos_mock_cls.return_value.lib
        func_mock = MagicMock(side_effect=pqos_l2ca_get_min_cbm_bits_mock)
        lib.pqos_l2ca_get_min_cbm_bits = func_mock

        l2ca = PqosCatL2()
        min_bits = l2ca.get_min_cbm_bits()

        self.assertEqual(min_bits, 2)
