import unittest
from urllib.error import HTTPError, URLError
from test_update_regex import TestUpdateRegex
from webpicdownloader.util.UpdateUtils import fetch_version, check_for_update

class TestUpdateUtils(unittest.TestCase):
    """
    Test Class for Update Utils
    <!> can not be executed directly <!>

    * regex -> use UpdateRegex unittest regex.
    * good_url -> use a permalink VERSION file.
    * bad_url -> bad link that point a 404 error.
    """
    regex = TestUpdateRegex.regex
    good_url = 'https://git.endmove.eu/EndMove/WebPicDownloader/raw/commit/6b26b89c6901841faaa09154c185d202223492c2/VERSION'
    bad_url = 'https://git.endmove.eu/EndMove/WebPicDownloader/raw/commit/bad-commit/VERSION'


    def test_fetch_version__good_url(self):
        """
        We test the recovery of the available version with a URL
        indicating a correct version file.
        """
        self.assertTrue(fetch_version(self.good_url) == '1.0.0')


    def test_fetch_version__bad_url(self):
        """
        We test the recovery of the version with erroneous URLs,
        or not leading to any specific file
        """
        self.assertRaises(HTTPError, lambda: fetch_version(self.bad_url))
        self.assertRaises(URLError, lambda: fetch_version('https://bad'))
        self.assertRaises(ValueError, lambda: fetch_version('bad'))


    def test_check_for_update__new_version(self):
        """
        We check the availability of an update with softwares whose
        versions are different from the one indicated by the repository
        (thus available update).
        """
        self.assertTrue(check_for_update('0.0.0', self.good_url, self.regex))
        self.assertTrue(check_for_update('0.48.0', self.good_url, self.regex))
        self.assertTrue(check_for_update('0.48.14', self.good_url, self.regex))
        self.assertTrue(check_for_update('5.48.14', self.good_url, self.regex))


    def test_check_for_update__no_new_version(self):
        """
        We check the availability of an update with software that has the
        same version as the one on the repository (so no update available).
        """
        self.assertFalse(check_for_update('1.0.0', self.good_url, self.regex))


    def test_check_for_update__bad_version(self):
        """
        We check for the availability of an update with an incorrect version
        in the repository.
        """
        self.assertRaises(ValueError, lambda: check_for_update(
            '1.0.0',
            'https://git.endmove.eu/EndMove/WebPicDownloader/src/commit/6b26b89c6901841faaa09154c185d202223492c2/app_version_file.txt',
            self.regex
        ))


    def test_check_for_update__bad_url(self):
        """
        We check the availability of an update with a bad repository url
        """
        self.assertRaises(HTTPError, lambda: check_for_update('1.0.0', self.bad_url, self.regex))