import os
import sys


def mock_search_fn(result_sets):
    '''Creates a search function that returns a new set of results on each
    call, cycling between each set in result_sets infinitely.

    `result_sets` is a list of results.  One set of results from this list is
    returned on each call.
    '''

    calls = 0

    def search_fn(_query):
        nonlocal calls

        results = result_sets[calls % len(result_sets)]
        calls += 1

        return results

    return search_fn


class TestDHCPAssignment:
    def setup(self):
        self.orig_path = os.getcwd()
        self.alerts_path = os.path.join(os.path.dirname(__file__), "../../../alerts")
        sys.path.insert(0, self.alerts_path)

    def teardown(self):
        os.chdir(self.orig_path)
        sys.path.remove(self.alerts_path)
        if 'lib' in sys.modules:
            del sys.modules['lib']

    def test_alert_enriched(self):
        from alerts.plugins.dhcp_assignment import enrich

        assign_results = {
            'hits': [
                {
                    '_source': {
                        'details': {
                            'ts': 1,
                            'mac': 'deadbeef'
                        }
                    }
                }
            ]
        }

        user_results = {
            'hits': [
                {
                    '_source': {
                        'receivedtimestamp': '2020-01-14T18:56:18.589623+00:00',
                        'summary': 'test=a string,user_name=tester@mozilla.com,o=32'
                    }
                }
            ]
        }

        alert = {
            'summary': 'prefix',
            'events': [
                {
                    'documentsource': {
                        'details': {
                            'sourceipaddress': '1.2.3.4'
                        }
                    }
                }
            ],
            'details': {
                'something': 'original'
            }
        }

        search_window_hours = 1

        search_fn = mock_search_fn([assign_results, user_results])

        enriched = enrich(alert, search_window_hours, search_fn)

        assert enriched['details']['something'] == 'original'
        assert 'ipassignment' in enriched['details']

        assign = enriched['details']['ipassignment']

        assert assign.get('mac') == 'deadbeef'
        assert assign.get('user') == 'tester@mozilla.com'

        assert alert['summary'].startswith('prefix')
        assert 'deadbeef' in alert['summary']
        assert 'tester@mozilla.com' in alert['summary']