import unittest

from app import app
from util.names import parse_namespace_repository
from initdb import setup_database_for_testing, finished_database_for_testing
from specs import build_index_specs
from endpoints.registry import registry
from endpoints.index import index
from endpoints.tags import tags


app.register_blueprint(index, url_prefix='/v1')
app.register_blueprint(tags, url_prefix='/v1')
app.register_blueprint(registry, url_prefix='/v1')


NO_ACCESS_USER = 'freshuser'
READ_ACCESS_USER = 'reader'
ADMIN_ACCESS_USER = 'devtable'


class EndpointTestCase(unittest.TestCase):
 def setUp(self):
    setup_database_for_testing(self)

 def tearDown(self):
    finished_database_for_testing(self)


class _SpecTestBuilder(type):
  @staticmethod
  def _test_generator(url, expected_status, open_kwargs, session_var_list):
    def test(self):
      with app.test_client() as c:
        if session_var_list:
          # Temporarily remove the teardown functions
          teardown_funcs = []
          if None in app.teardown_request_funcs:
            teardown_funcs = app.teardown_request_funcs[None]
            app.teardown_request_funcs[None] = []

          with c.session_transaction() as sess:
            for sess_key, sess_val in session_var_list:
              sess[sess_key] = sess_val

          # Restore the teardown functions
          app.teardown_request_funcs[None] = teardown_funcs

        rv = c.open(url, **open_kwargs)
        msg = '%s %s: %s expected: %s' % (open_kwargs['method'], url,
                                          rv.status_code, expected_status)
        self.assertEqual(rv.status_code, expected_status, msg)   
    return test


  def __new__(cls, name, bases, attrs):
    with app.test_request_context() as ctx:
      specs = attrs['spec_func']()
      for test_spec in specs:
        url, open_kwargs = test_spec.get_client_args()

        if attrs['auth_username']:
          basic_auth = test_spec.gen_basic_auth(attrs['auth_username'],
                                                'password')
          open_kwargs['headers'] = [('authorization', '%s' % basic_auth)]

        session_vars = []
        if test_spec.sess_repo:
          ns, repo = parse_namespace_repository(test_spec.sess_repo)
          session_vars.append(('namespace', ns))
          session_vars.append(('repository', repo))

        expected_status = getattr(test_spec, attrs['result_attr'])
        test = _SpecTestBuilder._test_generator(url, expected_status,
                                               open_kwargs,
                                               session_vars)

        test_name_url = url.replace('/', '_').replace('-', '_')
        sess_repo = str(test_spec.sess_repo).replace('/', '_')
        test_name = 'test_%s%s_%s' % (open_kwargs['method'].lower(),
                                     test_name_url, sess_repo)
        attrs[test_name] = test

    return type(name, bases, attrs)


class TestAnonymousAccess(EndpointTestCase):
  __metaclass__ = _SpecTestBuilder
  spec_func = build_index_specs
  result_attr = 'anon_code'
  auth_username = None


class TestNoAccess(EndpointTestCase):
  __metaclass__ = _SpecTestBuilder
  spec_func = build_index_specs
  result_attr = 'no_access_code'
  auth_username = NO_ACCESS_USER


class TestReadAccess(EndpointTestCase):
  __metaclass__ = _SpecTestBuilder
  spec_func = build_index_specs
  result_attr = 'read_code'
  auth_username = READ_ACCESS_USER


class TestAdminAccess(EndpointTestCase):
  __metaclass__ = _SpecTestBuilder
  spec_func = build_index_specs
  result_attr = 'admin_code'
  auth_username = ADMIN_ACCESS_USER