from datetime import datetime
import unittest
from unittest import mock

from scrapy.extensions.corestats import CoreStats
from scrapy.spiders import Spider
from scrapy.statscollectors import StatsCollector, DummyStatsCollector
from scrapy.utils.test import get_crawler


class CoreStatsExtensionTest(unittest.TestCase):

    def setUp(self):
        self.crawler = get_crawler(Spider)
        self.spider = self.crawler._create_spider('foo')

    @mock.patch('scrapy.extensions.corestats.datetime')
    def test_core_stats_default_stats_collector(self, mock_datetime):
        fixed_datetime = datetime(2019, 12, 1, 11, 38)
        mock_datetime.utcnow = mock.Mock(return_value=fixed_datetime)
        self.crawler.stats = StatsCollector(self.crawler)
        ext = CoreStats.from_crawler(self.crawler)
        ext.spider_opened(self.spider)
        ext.item_scraped({}, self.spider)
        ext.response_received(self.spider)
        ext.item_dropped({}, self.spider, ZeroDivisionError())
        ext.spider_closed(self.spider, 'finished')
        self.assertEqual(
            ext.stats._stats,
            {
                'start_time': fixed_datetime,
                'finish_time': fixed_datetime,
                'item_scraped_count': 1,
                'response_received_count': 1,
                'item_dropped_count': 1,
                'item_dropped_reasons_count/ZeroDivisionError': 1,
                'finish_reason': 'finished',
                'elapsed_time_seconds': 0.0,
            }
        )

    def test_core_stats_dummy_stats_collector(self):
        self.crawler.stats = DummyStatsCollector(self.crawler)
        ext = CoreStats.from_crawler(self.crawler)
        ext.spider_opened(self.spider)
        ext.item_scraped({}, self.spider)
        ext.response_received(self.spider)
        ext.item_dropped({}, self.spider, ZeroDivisionError())
        ext.spider_closed(self.spider, 'finished')
        self.assertEqual(ext.stats._stats, {})


class StatsCollectorTest(unittest.TestCase):

    def setUp(self):
        self.crawler = get_crawler(Spider)
        self.spider = self.crawler._create_spider('foo')

    def test_collector(self):
        stats = StatsCollector(self.crawler)
        self.assertEqual(stats.get_stats(), {})
        self.assertEqual(stats.get_value('anything'), None)
        self.assertEqual(stats.get_value('anything', 'default'), 'default')
        stats.set_value('test', 'value')
        self.assertEqual(stats.get_stats(), {'test': 'value'})
        stats.set_value('test2', 23)
        self.assertEqual(stats.get_stats(), {'test': 'value', 'test2': 23})
        self.assertEqual(stats.get_value('test2'), 23)
        stats.inc_value('test2')
        self.assertEqual(stats.get_value('test2'), 24)
        stats.inc_value('test2', 6)
        self.assertEqual(stats.get_value('test2'), 30)
        stats.max_value('test2', 6)
        self.assertEqual(stats.get_value('test2'), 30)
        stats.max_value('test2', 40)
        self.assertEqual(stats.get_value('test2'), 40)
        stats.max_value('test3', 1)
        self.assertEqual(stats.get_value('test3'), 1)
        stats.min_value('test2', 60)
        self.assertEqual(stats.get_value('test2'), 40)
        stats.min_value('test2', 35)
        self.assertEqual(stats.get_value('test2'), 35)
        stats.min_value('test4', 7)
        self.assertEqual(stats.get_value('test4'), 7)

    def test_dummy_collector(self):
        stats = DummyStatsCollector(self.crawler)
        self.assertEqual(stats.get_stats(), {})
        self.assertEqual(stats.get_value('anything'), None)
        self.assertEqual(stats.get_value('anything', 'default'), 'default')
        stats.set_value('test', 'value')
        stats.inc_value('v1')
        stats.max_value('v2', 100)
        stats.min_value('v3', 100)
        stats.open_spider('a')
        stats.set_value('test', 'value', spider=self.spider)
        self.assertEqual(stats.get_stats(), {})
        self.assertEqual(stats.get_stats('a'), {})