import time
from unittest import TestCase, mock

from scripts.lib.check_rabbitmq_queue import CRITICAL, OK, UNKNOWN, WARNING, analyze_queue_stats


class AnalyzeQueueStatsTests(TestCase):
    def test_no_stats_available(self) -> None:
        result = analyze_queue_stats('name', {}, 0)
        self.assertEqual(result['status'], UNKNOWN)

    def test_queue_stuck(self) -> None:
        """Last update > 5 minutes ago and there's events in the queue."""

        result = analyze_queue_stats('name', {'update_time': time.time() - 301}, 100)
        self.assertEqual(result['status'], CRITICAL)
        self.assertIn('queue appears to be stuck', result['message'])

    def test_queue_just_started(self) -> None:
        """
        We just started processing a burst of events, and haven't processed enough
        to log productivity statistics yet.
        """
        result = analyze_queue_stats('name', {'update_time': time.time(),
                                              'current_queue_size': 10000,
                                              'recent_average_consume_time': None}, 10000)
        self.assertEqual(result['status'], OK)

    def test_queue_normal(self) -> None:
        """10000 events and each takes a second => it'll take a long time to empty."""
        result = analyze_queue_stats('name', {'update_time': time.time(),
                                              'current_queue_size': 10000,
                                              'queue_last_emptied_timestamp': time.time() - 10000,
                                              'recent_average_consume_time': 1}, 10000)
        self.assertEqual(result['status'], CRITICAL)
        self.assertIn('clearing the backlog', result['message'])

        # If we're doing 10K/sec, it's OK.
        result = analyze_queue_stats('name', {'update_time': time.time(),
                                              'current_queue_size': 10000,
                                              'queue_last_emptied_timestamp': time.time() - 10000,
                                              'recent_average_consume_time': 0.0001}, 10000)
        self.assertEqual(result['status'], OK)

        # Verify logic around whether it'll take MAX_SECONDS_TO_CLEAR to clear queue.
        with mock.patch.dict('scripts.lib.check_rabbitmq_queue.MAX_SECONDS_TO_CLEAR',
                             {'name': 10}):
            result = analyze_queue_stats('name', {'update_time': time.time(),
                                                  'current_queue_size': 11,
                                                  'queue_last_emptied_timestamp': time.time() - 10000,
                                                  'recent_average_consume_time': 1}, 11)
            self.assertEqual(result['status'], WARNING)
            self.assertIn('clearing the backlog', result['message'])

            result = analyze_queue_stats('name', {'update_time': time.time(),
                                                  'current_queue_size': 9,
                                                  'queue_last_emptied_timestamp': time.time() - 10000,
                                                  'recent_average_consume_time': 1}, 9)
            self.assertEqual(result['status'], OK)