# -*- coding: utf-8 -*-
"""Tests for the common routines."""

__author__ = 'Diego Elio Pettenò'
__email__ = 'flameeyes@flameeyes.eu'
__copyright__ = 'Copyright © 2018, Diego Elio Pettenò'
__license__ = 'MIT'

import datetime
import os
import sys
import unittest

import construct

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from glucometerutils.support import construct_extras


_TEST_DATE1 = datetime.datetime(1970, 1, 2, 0, 0)
_TEST_DATE2 = datetime.datetime(1971, 1, 1, 0, 0)
_TEST_DATE3 = datetime.datetime(1970, 1, 1, 0, 0)

_NEW_EPOCH = 31536000  # datetime.datetime(1971, 1, 1, 0, 0)

class TestTimestamp(unittest.TestCase):

    def test_build_unix_epoch(self):
        self.assertEqual(
            construct_extras.Timestamp(construct.Int32ul).build(_TEST_DATE1),
            b'\x80\x51\x01\x00')

    def test_parse_unix_epoch(self):
        self.assertEqual(
            construct_extras.Timestamp(construct.Int32ul).parse(
                b'\x803\xe1\x01'),
            _TEST_DATE2)

    def test_build_custom_epoch(self):
        self.assertEqual(
            construct_extras.Timestamp(
                construct.Int32ul, epoch=_NEW_EPOCH).build(_TEST_DATE2),
            b'\x00\x00\x00\x00')

    def test_parse_custom_epoch(self):
        self.assertEqual(
            construct_extras.Timestamp(
                construct.Int32ul, epoch=_NEW_EPOCH).parse(
                    b'\x00\x00\x00\x00'),
            _TEST_DATE2)

    def test_build_custom_epoch_negative_failure(self):
        with self.assertRaises(construct.core.FieldError):
            construct_extras.Timestamp(
                construct.Int32ul, epoch=_NEW_EPOCH).build(_TEST_DATE1)

    def test_build_custom_epoch_negative_success(self):
        self.assertEqual(
            construct_extras.Timestamp(
                construct.Int32sl, epoch=_NEW_EPOCH).build(_TEST_DATE1),
            b'\x00\x1e\x20\xfe')

    def test_build_varint(self):
        self.assertEqual(
            construct_extras.Timestamp(construct.VarInt).build(_TEST_DATE3),
            b'\x00')

    def test_invalid_value(self):
        with self.assertRaises(AssertionError):
            construct_extras.Timestamp(construct.Int32ul).build('foo')


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