##############################################################################
# Copyright 2009, Gerhard Weis
# All rights reserved.
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# modification, are permitted provided that the following conditions are met:
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#    this list of conditions and the following disclaimer.
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#    this list of conditions and the following disclaimer in the documentation
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#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
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'''
Test cases for the isodate module.
'''
import unittest
from datetime import date
from isodate import parse_date, ISO8601Error, date_isoformat
from isodate import DATE_CENTURY, DATE_YEAR, DATE_MONTH
from isodate import DATE_EXT_COMPLETE, DATE_BAS_COMPLETE
from isodate import DATE_BAS_ORD_COMPLETE, DATE_EXT_ORD_COMPLETE
from isodate import DATE_BAS_WEEK, DATE_BAS_WEEK_COMPLETE
from isodate import DATE_EXT_WEEK, DATE_EXT_WEEK_COMPLETE

# the following list contains tuples of ISO date strings and the expected
# result from the parse_date method. A result of None means an ISO8601Error
# is expected. The test cases are grouped into dates with 4 digit years
# and 6 digit years.
TEST_CASES = {4: [('19', date(1901, 1, 1), DATE_CENTURY),
                  ('1985', date(1985, 1, 1), DATE_YEAR),
                  ('1985-04', date(1985, 4, 1), DATE_MONTH),
                  ('1985-04-12', date(1985, 4, 12), DATE_EXT_COMPLETE),
                  ('19850412', date(1985, 4, 12), DATE_BAS_COMPLETE),
                  ('1985102', date(1985, 4, 12), DATE_BAS_ORD_COMPLETE),
                  ('1985-102', date(1985, 4, 12), DATE_EXT_ORD_COMPLETE),
                  ('1985W155', date(1985, 4, 12), DATE_BAS_WEEK_COMPLETE),
                  ('1985-W15-5', date(1985, 4, 12), DATE_EXT_WEEK_COMPLETE),
                  ('1985W15', date(1985, 4, 8), DATE_BAS_WEEK),
                  ('1985-W15', date(1985, 4, 8), DATE_EXT_WEEK),
                  ('1989-W15', date(1989, 4, 10), DATE_EXT_WEEK),
                  ('1989-W15-5', date(1989, 4, 14), DATE_EXT_WEEK_COMPLETE),
                  ('1-W1-1', None, DATE_BAS_WEEK_COMPLETE)],
              6: [('+0019', date(1901, 1, 1), DATE_CENTURY),
                  ('+001985', date(1985, 1, 1), DATE_YEAR),
                  ('+001985-04', date(1985, 4, 1), DATE_MONTH),
                  ('+001985-04-12', date(1985, 4, 12), DATE_EXT_COMPLETE),
                  ('+0019850412', date(1985, 4, 12), DATE_BAS_COMPLETE),
                  ('+001985102', date(1985, 4, 12), DATE_BAS_ORD_COMPLETE),
                  ('+001985-102', date(1985, 4, 12), DATE_EXT_ORD_COMPLETE),
                  ('+001985W155', date(1985, 4, 12), DATE_BAS_WEEK_COMPLETE),
                  ('+001985-W15-5', date(1985, 4, 12), DATE_EXT_WEEK_COMPLETE),
                  ('+001985W15', date(1985, 4, 8), DATE_BAS_WEEK),
                  ('+001985-W15', date(1985, 4, 8), DATE_EXT_WEEK)]}


def create_testcase(yeardigits, datestring, expectation, format):
    '''
    Create a TestCase class for a specific test.

    This allows having a separate TestCase for each test tuple from the
    TEST_CASES list, so that a failed test won't stop other tests.
    '''

    class TestDate(unittest.TestCase):
        '''
        A test case template to parse an ISO date string into a date
        object.
        '''

        def test_parse(self):
            '''
            Parse an ISO date string and compare it to the expected value.
            '''
            if expectation is None:
                self.assertRaises(ISO8601Error, parse_date, datestring,
                                  yeardigits)
            else:
                result = parse_date(datestring, yeardigits)
                self.assertEqual(result, expectation)

        def test_format(self):
            '''
            Take date object and create ISO string from it.
            This is the reverse test to test_parse.
            '''
            if expectation is None:
                self.assertRaises(AttributeError,
                                  date_isoformat, expectation, format,
                                  yeardigits)
            else:
                self.assertEqual(date_isoformat(expectation, format,
                                                yeardigits),
                                 datestring)

    return unittest.TestLoader().loadTestsFromTestCase(TestDate)


def test_suite():
    '''
    Construct a TestSuite instance for all test cases.
    '''
    suite = unittest.TestSuite()
    for yeardigits, tests in TEST_CASES.items():
        for datestring, expectation, format in tests:
            suite.addTest(create_testcase(yeardigits, datestring,
                                          expectation, format))
    return suite


# load_tests Protocol
def load_tests(loader, tests, pattern):
    return test_suite()


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