import unittest
import datetime
import pandas as pd

import sys
sys.path.append('..')
from analytics.utils import *

class TestStartDate(unittest.TestCase):

    def test_previous_twentieth(self):
        self.assertEqual(previous_twentieth(datetime.date(2016, 9, 20)),
                         datetime.date(2016, 9, 20))
        self.assertEqual(previous_twentieth(datetime.date(2016, 10, 15)),
                         datetime.date(2016, 9, 20))
        self.assertEqual(previous_twentieth(datetime.date(2016, 12, 20)),
                         datetime.date(2016, 12, 20))
        self.assertEqual(previous_twentieth(datetime.date(2017, 3, 19)),
                         datetime.date(2016, 12, 20))

    def test_previous_twentieth_timestamp(self):
        self.assertEqual(previous_twentieth(pd.Timestamp('2016-09-20')),
                         pd.Timestamp('2016-09-20'))
        self.assertEqual(previous_twentieth(pd.Timestamp('2016-10-15')),
                         pd.Timestamp('2016-09-20'))
        self.assertEqual(previous_twentieth(pd.Timestamp('2016-12-20')),
                         pd.Timestamp('2016-12-20'))
        self.assertEqual(previous_twentieth(pd.Timestamp('2017-03-19')),
                         pd.Timestamp('2016-12-20'))

class TestEndDate(unittest.TestCase):
    def test_enddate(self):
        self.assertEqual(roll_date(datetime.date(2016, 9, 20), 5),
                         datetime.date(2021, 12, 20))
        self.assertEqual(roll_date(datetime.date(2016, 10, 15), 5),
                         datetime.date(2021, 12, 20))
        self.assertEqual(roll_date(datetime.date(2017, 3, 19), 5),
                         datetime.date(2021, 12, 20))
        self.assertEqual(roll_date(datetime.date(2017, 3, 20), 5),
                         datetime.date(2022, 6, 20))

    def test_enddate_pre2015(self):
        self.assertEqual(roll_date(datetime.date(2014, 9, 20), 5),
                         datetime.date(2019, 12, 20))
        self.assertEqual(roll_date(datetime.date(2014, 10, 15), 5),
                         datetime.date(2019, 12, 20))
        self.assertEqual(roll_date(datetime.date(2015, 3, 19), 5),
                         datetime.date(2020, 3, 20))
        self.assertEqual(roll_date(datetime.date(2015, 3, 20), 5),
                         datetime.date(2020, 6, 20))

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