# This file is part of cloud-init. See LICENSE file for license information.

from cloudinit.distros.parsers import resolv_conf
from cloudinit.distros import rhel_util

from cloudinit.tests.helpers import TestCase

import re
import tempfile


BASE_RESOLVE = '''
; generated by /sbin/dhclient-script
search blah.yahoo.com yahoo.com
nameserver 10.15.44.14
nameserver 10.15.30.92
'''
BASE_RESOLVE = BASE_RESOLVE.strip()


class TestResolvHelper(TestCase):
    def test_parse_same(self):
        rp = resolv_conf.ResolvConf(BASE_RESOLVE)
        rp_r = str(rp).strip()
        self.assertEqual(BASE_RESOLVE, rp_r)

    def test_write_works(self):
        with tempfile.NamedTemporaryFile() as fh:
            rhel_util.update_resolve_conf_file(fh.name, [], [])

    def test_local_domain(self):
        rp = resolv_conf.ResolvConf(BASE_RESOLVE)
        self.assertIsNone(rp.local_domain)

        rp.local_domain = "bob"
        self.assertEqual('bob', rp.local_domain)
        self.assertIn('domain bob', str(rp))

    def test_nameservers(self):
        rp = resolv_conf.ResolvConf(BASE_RESOLVE)
        self.assertIn('10.15.44.14', rp.nameservers)
        self.assertIn('10.15.30.92', rp.nameservers)
        rp.add_nameserver('10.2')
        self.assertIn('10.2', rp.nameservers)
        self.assertIn('nameserver 10.2', str(rp))
        self.assertNotIn('10.3', rp.nameservers)
        self.assertEqual(len(rp.nameservers), 3)
        rp.add_nameserver('10.2')
        rp.add_nameserver('10.3')
        self.assertNotIn('10.3', rp.nameservers)

    def test_search_domains(self):
        rp = resolv_conf.ResolvConf(BASE_RESOLVE)
        self.assertIn('yahoo.com', rp.search_domains)
        self.assertIn('blah.yahoo.com', rp.search_domains)
        rp.add_search_domain('bbb.y.com')
        self.assertIn('bbb.y.com', rp.search_domains)
        self.assertTrue(re.search(r'search(.*)bbb.y.com(.*)', str(rp)))
        self.assertIn('bbb.y.com', rp.search_domains)
        rp.add_search_domain('bbb.y.com')
        self.assertEqual(len(rp.search_domains), 3)
        rp.add_search_domain('bbb2.y.com')
        self.assertEqual(len(rp.search_domains), 4)
        rp.add_search_domain('bbb3.y.com')
        self.assertEqual(len(rp.search_domains), 5)
        rp.add_search_domain('bbb4.y.com')
        self.assertEqual(len(rp.search_domains), 6)
        self.assertRaises(ValueError, rp.add_search_domain, 'bbb5.y.com')
        self.assertEqual(len(rp.search_domains), 6)

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