from os.path import join

from twisted.trial import unittest
from twisted.internet import defer

from scrapy.utils.testsite import SiteTest
from scrapy.utils.testproc import ProcessTest

from tests import tests_datadir


class ShellTest(ProcessTest, SiteTest, unittest.TestCase):

    command = 'shell'

    @defer.inlineCallbacks
    def test_empty(self):
        _, out, _ = yield self.execute(['-c', 'item'])
        assert b'{}' in out

    @defer.inlineCallbacks
    def test_response_body(self):
        _, out, _ = yield self.execute([self.url('/text'), '-c', 'response.body'])
        assert b'Works' in out

    @defer.inlineCallbacks
    def test_response_type_text(self):
        _, out, _ = yield self.execute([self.url('/text'), '-c', 'type(response)'])
        assert b'TextResponse' in out

    @defer.inlineCallbacks
    def test_response_type_html(self):
        _, out, _ = yield self.execute([self.url('/html'), '-c', 'type(response)'])
        assert b'HtmlResponse' in out

    @defer.inlineCallbacks
    def test_response_selector_html(self):
        xpath = 'response.xpath("//p[@class=\'one\']/text()").get()'
        _, out, _ = yield self.execute([self.url('/html'), '-c', xpath])
        self.assertEqual(out.strip(), b'Works')

    @defer.inlineCallbacks
    def test_response_encoding_gb18030(self):
        _, out, _ = yield self.execute([self.url('/enc-gb18030'), '-c', 'response.encoding'])
        self.assertEqual(out.strip(), b'gb18030')

    @defer.inlineCallbacks
    def test_redirect(self):
        _, out, _ = yield self.execute([self.url('/redirect'), '-c', 'response.url'])
        assert out.strip().endswith(b'/redirected')

    @defer.inlineCallbacks
    def test_redirect_follow_302(self):
        _, out, _ = yield self.execute([self.url('/redirect-no-meta-refresh'), '-c', 'response.status'])
        assert out.strip().endswith(b'200')

    @defer.inlineCallbacks
    def test_redirect_not_follow_302(self):
        _, out, _ = yield self.execute(['--no-redirect', self.url('/redirect-no-meta-refresh'), '-c', 'response.status'])
        assert out.strip().endswith(b'302')

    @defer.inlineCallbacks
    def test_fetch_redirect_follow_302(self):
        """Test that calling ``fetch(url)`` follows HTTP redirects by default."""
        url = self.url('/redirect-no-meta-refresh')
        code = "fetch('{0}')"
        errcode, out, errout = yield self.execute(['-c', code.format(url)])
        self.assertEqual(errcode, 0, out)
        assert b'Redirecting (302)' in errout
        assert b'Crawled (200)' in errout

    @defer.inlineCallbacks
    def test_fetch_redirect_not_follow_302(self):
        """Test that calling ``fetch(url, redirect=False)`` disables automatic redirects."""
        url = self.url('/redirect-no-meta-refresh')
        code = "fetch('{0}', redirect=False)"
        errcode, out, errout = yield self.execute(['-c', code.format(url)])
        self.assertEqual(errcode, 0, out)
        assert b'Crawled (302)' in errout

    @defer.inlineCallbacks
    def test_request_replace(self):
        url = self.url('/text')
        code = "fetch('{0}') or fetch(response.request.replace(method='POST'))"
        errcode, out, _ = yield self.execute(['-c', code.format(url)])
        self.assertEqual(errcode, 0, out)

    @defer.inlineCallbacks
    def test_scrapy_import(self):
        url = self.url('/text')
        code = "fetch(scrapy.Request('{0}'))"
        errcode, out, _ = yield self.execute(['-c', code.format(url)])
        self.assertEqual(errcode, 0, out)

    @defer.inlineCallbacks
    def test_local_file(self):
        filepath = join(tests_datadir, 'test_site/index.html')
        _, out, _ = yield self.execute([filepath, '-c', 'item'])
        assert b'{}' in out

    @defer.inlineCallbacks
    def test_local_nofile(self):
        filepath = 'file:///tests/sample_data/test_site/nothinghere.html'
        errcode, out, err = yield self.execute([filepath, '-c', 'item'],
                                       check_code=False)
        self.assertEqual(errcode, 1, out or err)
        self.assertIn(b'No such file or directory', err)

    @defer.inlineCallbacks
    def test_dns_failures(self):
        url = 'www.somedomainthatdoesntexi.st'
        errcode, out, err = yield self.execute([url, '-c', 'item'],
                                       check_code=False)
        self.assertEqual(errcode, 1, out or err)
        self.assertIn(b'DNS lookup failed', err)