"""Tests around project's distribution and packaging."""
import os
import unittest


tests_dir = os.path.dirname(os.path.abspath(__file__))
project_dir = os.path.dirname(tests_dir)
build_dir = os.path.join(project_dir, 'var', 'docs', 'html')


class VersionTestCase(unittest.TestCase):
    """Various checks around project's version info."""
    def get_version(self):
        """Return django_downloadview.__version__."""
        from django_downloadview import __version__
        return __version__

    def test_version_present(self):
        """:PEP:`396` - django_downloadview has __version__ attribute."""
        try:
            self.get_version()
        except ImportError:
            self.fail('django_downloadview package has no __version__.')

    def test_version_match(self):
        """django_downloadview.__version__ matches pkg_resources info."""
        try:
            import pkg_resources
        except ImportError:
            self.fail('Cannot import pkg_resources module. It is part of '
                      'setuptools, which is a dependency of '
                      'django_downloadview.')
        distribution = pkg_resources.get_distribution('django-downloadview')
        installed_version = distribution.version
        self.assertEqual(installed_version, self.get_version(),
                         'Version mismatch: django_downloadview.__version__ '
                         'is "%s" whereas pkg_resources tells "%s". '
                         'You may need to run ``make develop`` to update the '
                         'installed version in development environment.'
                         % (self.get_version(), installed_version))

    def test_version_file(self):
        """django_downloadview.__version__ matches VERSION file info."""
        version_file = os.path.join(project_dir, 'VERSION')
        file_version = open(version_file).read().strip()
        self.assertEqual(file_version, self.get_version(),
                         'Version mismatch: django_downloadview.__version__ '
                         'is "%s" whereas VERSION file tells "%s". '
                         'You may need to run ``make develop`` to update the '
                         'installed version in development environment.'
                         % (self.get_version(), file_version))