import json
import requests
from datetime import date, datetime
from unittest.mock import Mock

from django.core.files.base import ContentFile
from django.db import models
from django.test import RequestFactory, TestCase
from django.utils.http import base36_to_int, int_to_base36
from django.views import csrf

from allauth import app_settings, utils


class MockedResponse:
    def __init__(self, status_code, content, headers=None):
        if headers is None:
            headers = {}

        self.status_code = status_code
        if isinstance(content, dict):
            content = json.dumps(content)
            headers["content-type"] = "application/json"
        self.content = content.encode("utf8")
        self.headers = headers

    def json(self):
        return json.loads(self.text)

    def raise_for_status(self):
        pass

    @property
    def ok(self):
        return self.status_code // 100 == 2

    @property
    def text(self):
        return self.content.decode("utf8")


class mocked_response:
    def __init__(self, *responses, callback=None):
        self.callback = callback
        self.responses = list(responses)

    def __enter__(self):
        self.orig_get = requests.Session.get
        self.orig_post = requests.Session.post
        self.orig_request = requests.Session.request

        def mockable_request(f):
            def new_f(*args, **kwargs):
                if self.callback:
                    response = self.callback(*args, **kwargs)
                    if response is not None:
                        return response
                if self.responses:
                    resp = self.responses.pop(0)
                    if isinstance(resp, dict):
                        resp = MockedResponse(200, resp)
                    return resp
                return f(*args, **kwargs)

            return Mock(side_effect=new_f)

        requests.Session.get = mockable_request(requests.Session.get)
        requests.Session.post = mockable_request(requests.Session.post)
        requests.Session.request = mockable_request(requests.Session.request)

    def __exit__(self, type, value, traceback):
        requests.Session.get = self.orig_get
        requests.Session.post = self.orig_post
        requests.Session.request = self.orig_request


class BasicTests(TestCase):
    def setUp(self):
        self.factory = RequestFactory()

    def test_generate_unique_username(self):
        examples = [
            ("a.b-c@example.com", "a.b-c"),
            ("Üsêrnamê", "username"),
            ("User Name", "user_name"),
            ("", "user"),
        ]
        for input, username in examples:
            self.assertEqual(utils.generate_unique_username([input]), username)

    def test_email_validation(self):
        s = "this.email.address.is.a.bit.too.long.but.should.still.validate@example.com"  # noqa
        self.assertEqual(s, utils.valid_email_or_none(s))

    def test_serializer(self):
        class SomeValue:
            pass

        some_value = SomeValue()

        class SomeField(models.Field):
            def get_prep_value(self, value):
                return "somevalue"

            def from_db_value(self, value, expression, connection):
                return some_value

        class SomeModel(models.Model):
            dt = models.DateTimeField()
            t = models.TimeField()
            d = models.DateField()
            img1 = models.ImageField()
            img2 = models.ImageField()
            img3 = models.ImageField()
            something = SomeField()

        def method(self):
            pass

        instance = SomeModel(
            dt=datetime.now(),
            d=date.today(),
            something=some_value,
            t=datetime.now().time(),
        )
        instance.img1 = ContentFile(b"%PDF", name="foo.pdf")
        instance.img2 = ContentFile(
            b"\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x01\x00"
            b"\x00\x00\x007n\xf9$\x00\x00\x00\nIDATx\x9cc`\x00\x00\x00\x02\x00\x01H\xaf"
            b"\xa4q\x00\x00\x00\x00IEND\xaeB`\x82",
            name="foo.png",
        )
        # make sure serializer doesn't fail if a method is attached to
        # the instance
        instance.method = method
        instance.nonfield = "hello"
        data = utils.serialize_instance(instance)
        instance2 = utils.deserialize_instance(SomeModel, data)
        self.assertEqual(getattr(instance, "method", None), method)
        self.assertEqual(getattr(instance2, "method", None), None)
        self.assertEqual(instance2.something, some_value)
        self.assertEqual(instance2.img1.name, "foo.pdf")
        self.assertEqual(instance2.img2.name, "foo.png")
        self.assertEqual(instance2.img3.name, "")
        self.assertEqual(instance.nonfield, instance2.nonfield)
        self.assertEqual(instance.d, instance2.d)
        self.assertEqual(instance.dt.date(), instance2.dt.date())
        for t1, t2 in [
            (instance.t, instance2.t),
            (instance.dt.time(), instance2.dt.time()),
        ]:
            self.assertEqual(t1.hour, t2.hour)
            self.assertEqual(t1.minute, t2.minute)
            self.assertEqual(t1.second, t2.second)
            # AssertionError: datetime.time(10, 6, 28, 705776)
            #     != datetime.time(10, 6, 28, 705000)
            self.assertEqual(int(t1.microsecond / 1000), int(t2.microsecond / 1000))

    def test_serializer_binary_field(self):
        class SomeBinaryModel(models.Model):
            bb = models.BinaryField()
            bb_empty = models.BinaryField()

        instance = SomeBinaryModel(bb=b"some binary data")

        serialized = utils.serialize_instance(instance)
        deserialized = utils.deserialize_instance(SomeBinaryModel, serialized)

        self.assertEqual(serialized["bb"], "c29tZSBiaW5hcnkgZGF0YQ==")
        self.assertEqual(serialized["bb_empty"], "")
        self.assertEqual(deserialized.bb, b"some binary data")
        self.assertEqual(deserialized.bb_empty, b"")

    def test_build_absolute_uri(self):
        request = None
        if not app_settings.SITES_ENABLED:
            request = self.factory.get("/")
            request.META["SERVER_NAME"] = "example.com"
        self.assertEqual(
            utils.build_absolute_uri(request, "/foo"), "http://example.com/foo"
        )
        self.assertEqual(
            utils.build_absolute_uri(request, "/foo", protocol="ftp"),
            "ftp://example.com/foo",
        )
        self.assertEqual(
            utils.build_absolute_uri(request, "http://foo.com/bar"),
            "http://foo.com/bar",
        )

    def test_int_to_base36(self):
        n = 55798679658823689999
        b36 = "brxk553wvxbf3"
        assert int_to_base36(n) == b36
        assert base36_to_int(b36) == n

    def test_templatetag_with_csrf_failure(self):
        # Generate a fictitious GET request
        from allauth.socialaccount.models import SocialApp

        app = SocialApp.objects.create(provider="google")
        if app_settings.SITES_ENABLED:
            from django.contrib.sites.models import Site

            app.sites.add(Site.objects.get_current())

        request = self.factory.get("/tests/test_403_csrf.html")
        # Simulate a CSRF failure by calling the View directly
        # This template is using the `provider_login_url` templatetag
        response = csrf.csrf_failure(request, template_name="tests/test_403_csrf.html")
        # Ensure that CSRF failures with this template
        # tag succeed with the expected 403 response
        self.assertEqual(response.status_code, 403)