import os
from datetime import datetime
import shutil
from twisted.trial import unittest

from scrapy.extensions.spiderstate import SpiderState
from scrapy.spiders import Spider
from scrapy.exceptions import NotConfigured
from scrapy.utils.test import get_crawler


class SpiderStateTest(unittest.TestCase):

    def test_store_load(self):
        jobdir = self.mktemp()
        os.mkdir(jobdir)
        try:
            spider = Spider(name='default')
            dt = datetime.now()

            ss = SpiderState(jobdir)
            ss.spider_opened(spider)
            spider.state['one'] = 1
            spider.state['dt'] = dt
            ss.spider_closed(spider)

            spider2 = Spider(name='default')
            ss2 = SpiderState(jobdir)
            ss2.spider_opened(spider2)
            self.assertEqual(spider.state, {'one': 1, 'dt': dt})
            ss2.spider_closed(spider2)
        finally:
            shutil.rmtree(jobdir)

    def test_state_attribute(self):
        # state attribute must be present if jobdir is not set, to provide a
        # consistent interface
        spider = Spider(name='default')
        ss = SpiderState()
        ss.spider_opened(spider)
        self.assertEqual(spider.state, {})
        ss.spider_closed(spider)

    def test_not_configured(self):
        crawler = get_crawler(Spider)
        self.assertRaises(NotConfigured, SpiderState.from_crawler, crawler)