from __future__ import absolute_import, unicode_literals

import datetime
import os

from oauthlib.common import PY3
from oauthlib.oauth2.rfc6749.utils import (escape, generate_age, host_from_uri,
                                           is_secure_transport, list_to_scope,
                                           params_from_uri, scope_to_list)

from ...unittest import TestCase


class ScopeObject:
    """
    Fixture for testing list_to_scope()/scope_to_list() with objects other
    than regular strings.
    """
    def __init__(self, scope):
        self.scope = scope

    if PY3:
        def __str__(self):
            return self.scope
    else:
        def __unicode__(self):
            return self.scope


class UtilsTests(TestCase):

    def test_escape(self):
        """Assert that we are only escaping unicode"""
        self.assertRaises(ValueError, escape, b"I am a string type. Not a unicode type.")
        self.assertEqual(escape("I am a unicode type."), "I%20am%20a%20unicode%20type.")

    def test_host_from_uri(self):
        """Test if hosts and ports are properly extracted from URIs.

        This should be done according to the MAC Authentication spec.
        Defaults ports should be provided when none is present in the URI.
        """
        self.assertEqual(host_from_uri('http://a.b-c.com:8080'), ('a.b-c.com', '8080'))
        self.assertEqual(host_from_uri('https://a.b.com:8080'), ('a.b.com', '8080'))
        self.assertEqual(host_from_uri('http://www.example.com'), ('www.example.com', '80'))
        self.assertEqual(host_from_uri('https://www.example.com'), ('www.example.com', '443'))

    def test_is_secure_transport(self):
        """Test check secure uri."""
        if 'OAUTHLIB_INSECURE_TRANSPORT' in os.environ:
            del os.environ['OAUTHLIB_INSECURE_TRANSPORT']

        self.assertTrue(is_secure_transport('https://example.com'))
        self.assertFalse(is_secure_transport('http://example.com'))

        os.environ['OAUTHLIB_INSECURE_TRANSPORT'] = '1'
        self.assertTrue(is_secure_transport('http://example.com'))
        del os.environ['OAUTHLIB_INSECURE_TRANSPORT']

    def test_params_from_uri(self):
        self.assertEqual(params_from_uri('http://i.b/?foo=bar&g&scope=a+d'),
                         {'foo': 'bar', 'g': '', 'scope': ['a', 'd']})

    def test_generate_age(self):
        issue_time = datetime.datetime.now() - datetime.timedelta(
                days=3, minutes=1, seconds=4)
        self.assertGreater(float(generate_age(issue_time)), 259263.0)

    def test_list_to_scope(self):
        expected = 'foo bar baz'

        string_list = ['foo', 'bar', 'baz']
        self.assertEqual(list_to_scope(string_list), expected)

        string_tuple = ('foo', 'bar', 'baz')
        self.assertEqual(list_to_scope(string_tuple), expected)

        obj_list = [ScopeObject('foo'), ScopeObject('bar'), ScopeObject('baz')]
        self.assertEqual(list_to_scope(obj_list), expected)

        set_list = set(string_list)
        set_scope = list_to_scope(set_list)
        assert len(set_scope.split(' ')) == 3
        for x in string_list:
            assert x in set_scope

        self.assertRaises(ValueError, list_to_scope, object()) 

    def test_scope_to_list(self):
        expected = ['foo', 'bar', 'baz']

        string_scopes = 'foo bar baz '
        self.assertEqual(scope_to_list(string_scopes), expected)

        string_list_scopes = ['foo', 'bar', 'baz']
        self.assertEqual(scope_to_list(string_list_scopes), expected)

        tuple_list_scopes = ('foo', 'bar', 'baz')
        self.assertEqual(scope_to_list(tuple_list_scopes), expected)

        obj_list_scopes = [ScopeObject('foo'), ScopeObject('bar'), ScopeObject('baz')]
        self.assertEqual(scope_to_list(obj_list_scopes), expected)

        set_list_scopes = set(string_list_scopes)
        set_list = scope_to_list(set_list_scopes)
        self.assertEqual(sorted(set_list), sorted(string_list_scopes))
