import unittest
from unittest import mock
from uuid import UUID

from pyramid.httpexceptions import HTTPBadRequest

from kinto.core.errors import ERRORS, http_error
from kinto.core.storage import exceptions as storage_exceptions
from kinto.core.testing import FormattedErrorMixin, get_user_headers
from kinto.core.utils import hmac_digest

from ..support import MINIMALIST_RECORD, BaseWebTest


class DefaultBucketWebTest(BaseWebTest, unittest.TestCase):
    @classmethod
    def get_app_settings(cls, extras=None):
        settings = super().get_app_settings(extras)
        settings["includes"] = "kinto.plugins.default_bucket"
        return settings


class DefaultBucketViewTest(FormattedErrorMixin, DefaultBucketWebTest):

    bucket_url = "/buckets/default"
    collection_url = "/buckets/default/collections/tasks"

    def test_default_bucket_exists_and_has_user_id(self):
        bucket = self.app.get(self.bucket_url, headers=self.headers)
        result = bucket.json
        settings = self.app.app.registry.settings
        hmac_secret = settings["userid_hmac_secret"]
        bucket_id = hmac_digest(hmac_secret, self.principal)[:32]

        self.assertEqual(result["data"]["id"], str(UUID(bucket_id)))
        self.assertEqual(result["permissions"]["write"], [self.principal])

    def test_default_bucket_can_still_be_explicitly_created(self):
        bucket = {"permissions": {"read": ["system.Everyone"]}}
        resp = self.app.put_json(self.bucket_url, bucket, headers=self.headers)
        result = resp.json
        self.assertIn("system.Everyone", result["permissions"]["read"])

    def test_default_bucket_collection_can_still_be_explicitly_created(self):
        collection = {"data": {"synced": True}}
        resp = self.app.put_json(self.collection_url, collection, headers=self.headers)
        result = resp.json
        self.assertIn("synced", result["data"])
        self.assertTrue(result["data"]["synced"])
        resp = self.app.get(self.collection_url, headers=self.headers)
        result = resp.json
        self.assertIn("synced", result["data"])
        self.assertTrue("synced", result["data"]["synced"])

    def test_default_bucket_can_be_created_with_simple_put(self):
        self.app.put(self.bucket_url, headers=get_user_headers("bob"), status=201)

    def test_default_bucket_collections_are_automatically_created(self):
        self.app.get(self.collection_url, headers=self.headers, status=200)

    def test_adding_a_task_for_bob_doesnt_add_it_for_alice(self):
        record = {**MINIMALIST_RECORD}
        resp = self.app.post_json(
            self.collection_url + "/records", record, headers=get_user_headers("bob")
        )
        record_id = "{}/records/{}".format(self.collection_url, resp.json["data"]["id"])
        resp = self.app.get(record_id, headers=get_user_headers("alice"), status=404)

    def test_unauthenticated_bucket_access_raises_json_401(self):
        resp = self.app.get(self.bucket_url, status=401)
        self.assertEqual(
            resp.json["message"], "Please authenticate yourself to use this endpoint."
        )

    def test_bucket_id_is_an_uuid_with_dashes(self):
        bucket = self.app.get(self.bucket_url, headers=self.headers)
        bucket_id = bucket.json["data"]["id"]
        self.assertIn("-", bucket_id)
        try:
            UUID(bucket_id)
        except ValueError:
            self.fail("bucket_id: {} is not a valid UUID.".format(bucket_id))

    def test_second_call_on_default_bucket_doesnt_raise_a_412(self):
        self.app.get(self.bucket_url, headers=self.headers)
        self.app.get(self.bucket_url, headers=self.headers)

    def test_second_call_on_default_bucket_collection_doesnt_raise_a_412(self):
        self.app.get(self.collection_url, headers=self.headers)
        self.app.get(self.collection_url, headers=self.headers)

    def test_querystring_parameters_are_taken_into_account(self):
        self.app.get(
            self.collection_url + "/records?_since=invalid", headers=self.headers, status=400
        )

    def test_option_is_possible_without_authentication_for_default(self):
        headers = "authorization,content-type"
        self.app.options(
            self.collection_url + "/records",
            headers={
                "Origin": "http://localhost:8000",
                "Access-Control-Request-Method": "GET",
                "Access-Control-Request-Headers": headers,
            },
        )

    def test_cors_headers_are_provided_on_errors(self):
        resp = self.app.post_json(
            self.collection_url + "/records", MINIMALIST_RECORD, headers=self.headers
        )
        current = resp.json["data"]["last_modified"]
        headers = {
            **self.headers,
            "Origin": "http://localhost:8000",
            "If-None-Match": ('"{}"'.format(current)).encode("utf-8"),
        }
        resp = self.app.get(self.collection_url + "/records", headers=headers, status=304)
        self.assertIn("Access-Control-Allow-Origin", resp.headers)
        self.assertIn("ETag", resp.headers["Access-Control-Expose-Headers"])

    def test_etag_is_present_and_exposed_in_304_error(self):
        resp = self.app.post_json(
            self.collection_url + "/records", MINIMALIST_RECORD, headers=self.headers
        )
        current = resp.json["data"]["last_modified"]
        headers = {
            **self.headers,
            "Origin": "http://localhost:8000",
            "If-None-Match": ('"{}"'.format(current)).encode("utf-8"),
        }
        resp = self.app.get(self.collection_url + "/records", headers=headers, status=304)
        self.assertIn("Access-Control-Expose-Headers", resp.headers)
        self.assertIn("ETag", resp.headers)
        self.assertIn("ETag", resp.headers["Access-Control-Expose-Headers"])

    def test_bucket_id_starting_with_default_can_still_be_created(self):
        # We need to create the bucket first since it is not the default bucket
        resp = self.app.put(
            self.bucket_url.replace("default", "default-1234"), headers=self.headers, status=201
        )
        bucket_id = resp.json["data"]["id"]
        self.assertEqual(bucket_id, "default-1234")

        # We can then create the collection
        collection_url = "/buckets/default-1234/collections/default"
        self.app.put(collection_url, headers=self.headers, status=201)
        resp = self.app.get("/buckets/default-1234/collections", headers=self.headers)
        self.assertEqual(resp.json["data"][0]["id"], "default")

    def test_bucket_id_in_body_can_be_default(self):
        self.app.put_json(
            "/buckets/default", {"data": {"id": "default"}}, headers=self.headers, status=201
        )

    def test_default_bucket_objects_are_checked_only_once_in_batch(self):
        batch = {"requests": []}
        nb_create = 25
        for i in range(nb_create):
            request = {
                "method": "POST",
                "path": self.collection_url + "/records",
                "body": MINIMALIST_RECORD,
            }
            batch["requests"].append(request)

        with mock.patch.object(self.storage, "create", wraps=self.storage.create) as patched:
            self.app.post_json("/batch", batch, headers=self.headers)
            self.assertEqual(patched.call_count, nb_create + 2)

    def test_parent_collection_is_taken_from_the_one_created_in_batch(self):
        batch = {"requests": []}
        nb_create = 25
        for i in range(nb_create):
            request = {
                "method": "POST",
                "path": self.collection_url + "/records",
                "body": MINIMALIST_RECORD,
            }
            batch["requests"].append(request)

        with mock.patch.object(self.storage, "create", wraps=self.storage.create) as patched:
            self.app.post_json("/batch", batch, headers=self.headers)
            # Called twice only: bucket + collection ids unicity.
            self.assertEqual(patched.call_count, 25 + 2)

    def test_parent_collection_is_taken_from_the_one_checked_in_batch(self):
        # Create it first.
        self.app.put(self.collection_url, headers=self.headers, status=201)

        batch = {"requests": []}
        nb_create = 25
        for i in range(nb_create):
            request = {
                "method": "POST",
                "path": self.collection_url + "/records",
                "body": MINIMALIST_RECORD,
            }
            batch["requests"].append(request)

        with mock.patch.object(self.storage, "create", wraps=self.storage.create) as patched:
            self.app.post_json("/batch", batch, headers=self.headers)
            # Called twice only: bucket + collection ids unicity.
            self.assertEqual(patched.call_count, 25 + 2)

    def test_collection_id_is_validated(self):
        collection_url = "/buckets/default/collections/__files__/records"
        self.app.get(collection_url, headers=self.headers, status=400)

    def test_collection_id_does_not_support_unicode(self):
        collection_url = "/buckets/default/collections/%E8%A6%8B/records"
        self.app.get(collection_url, headers=self.headers, status=400)

    def test_405_is_a_valid_formatted_error(self):
        response = self.app.post(self.collection_url, headers=self.headers, status=405)
        self.assertFormattedError(
            response,
            405,
            ERRORS.METHOD_NOT_ALLOWED,
            "Method Not Allowed",
            "Method not allowed on this endpoint.",
        )

    def test_formatted_error_are_passed_through(self):
        # Create the parent objects
        self.app.post(self.collection_url + "/records", headers=self.headers)

        # Simulate a validation error.
        fake400 = http_error(HTTPBadRequest(), errno=ERRORS.INVALID_PARAMETERS, message="Yop")
        with mock.patch.object(self.storage, "create") as mocked:
            mocked.side_effect = [
                {"id": "abc", "last_modified": 43},
                {"id": "abc", "last_modified": 44},
                fake400,
            ]
            resp = self.app.post(
                self.collection_url + "/records", headers=self.headers, status=400
            )
            self.assertEqual(resp.body, fake400.body)

    def test_trailing_slash_redirection_works_for_default_bucket(self):
        collection_url = "/buckets/default/"
        resp = self.app.get(collection_url, headers=self.headers, status=307)
        assert resp.headers["Location"].endswith("/buckets/default")

    def test_trailing_slash_redirection_works_for_collections(self):
        collection_url = "/buckets/default/collections/"
        resp = self.app.get(collection_url, headers=self.headers, status=307)
        assert resp.headers["Location"].endswith("/buckets/default/collections")

    def test_trailing_slash_redirection_works_for_collection(self):
        collection_url = "/buckets/default/collections/foo/"
        resp = self.app.get(collection_url, headers=self.headers, status=307)
        assert resp.headers["Location"].endswith("/buckets/default/collections/foo")

    def test_trailing_slash_redirection_works_for_records(self):
        records_url = "/buckets/default/collections/foo/records/"
        resp = self.app.get(records_url, headers=self.headers, status=307)
        assert resp.headers["Location"].endswith("/buckets/default/collections/foo/records")

    def test_trailing_slash_redirection_works_for_record(self):
        records_url = "/buckets/default/collections/foo/records/bar/"
        resp = self.app.get(records_url, headers=self.headers, status=307)
        assert resp.headers["Location"].endswith("/buckets/default/collections/foo/records/bar")


class HelloViewTest(DefaultBucketWebTest):
    def test_returns_bucket_id_and_url_if_authenticated(self):
        response = self.app.get("/", headers=self.headers)
        userinfo = response.json["user"]
        self.assertIn("id", userinfo)
        self.assertIn("principals", userinfo)
        self.assertIn("bucket", userinfo)
        self.assertEqual(userinfo["bucket"], "ddaf8694-fa9e-2949-ed0e-77198a7907fb")

    def test_flush_capability_if_enabled(self):
        resp = self.app.get("/")
        capabilities = resp.json["capabilities"]
        self.assertIn("default_bucket", capabilities)


_events = []


def load_from_config(config, prefix):
    def listener(event):
        _events.append(event)

    return listener


class EventsTest(DefaultBucketWebTest):
    def tearDown(self):
        super().tearDown()
        del _events[:]

    @classmethod
    def get_app_settings(cls, extras=None):
        settings = super().get_app_settings(extras)
        settings = {
            **settings,
            "event_listeners": "testevent",
            "event_listeners.testevent.use": "tests.plugins.test_default_bucket",
        }
        return settings

    def test_an_event_is_sent_on_implicit_bucket_creation(self):
        bucket_url = "/buckets/default"
        self.app.get(bucket_url, headers=self.headers)
        assert len(_events) == 1
        assert "last_modified" in _events[-1].impacted_objects[0]["new"]
        payload = _events[-1].payload
        assert payload["resource_name"] == "bucket"
        assert payload["action"] == "create"

    def test_an_event_is_sent_on_implicit_collection_creation(self):
        collection_url = "/buckets/default/collections/articles"
        self.app.get(collection_url, headers=self.headers)
        assert len(_events) == 2
        payload = _events[-1].payload
        assert payload["resource_name"] == "collection"
        assert payload["action"] == "create"

    def test_events_sent_on_bucket_and_collection_creation(self):
        records_uri = "/buckets/default/collections/articles/records/implicit"
        body = {"data": {"implicit": "creations"}}
        self.app.put_json(records_uri, body, headers=self.headers)

        assert len(_events) == 3

        # Implicit creation of bucket
        resp = self.app.get("/", headers=self.headers)
        bucket_id = resp.json["user"]["bucket"]
        assert "subpath" not in _events[0].payload
        assert _events[0].payload["action"] == "create"
        assert _events[0].payload["bucket_id"] == bucket_id
        assert _events[0].payload["uri"] == "/buckets/{}".format(bucket_id)

        # Implicit creation of collection
        assert "subpath" not in _events[1].payload
        assert _events[1].payload["action"] == "create"
        assert _events[1].payload["resource_name"] == "collection"
        assert _events[1].payload["bucket_id"] == bucket_id
        assert _events[1].payload["collection_id"] == "articles"
        assert _events[1].payload["uri"] == "/buckets/{}/collections/articles".format(bucket_id)

        # Creation of record
        assert _events[2].payload["action"] == "create"
        assert _events[2].payload["resource_name"] == "record"
        assert _events[2].payload["bucket_id"] == bucket_id
        assert _events[2].payload["collection_id"] == "articles"
        assert _events[2].payload["uri"] == records_uri.replace("default", bucket_id)

    def test_second_call_on_default_bucket_doesnt_send_create_events(self):
        bucket_url = "/buckets/default"
        self.app.get(bucket_url, headers=self.headers)
        # An event is generated -- it's the same event from
        # test_an_event_is_sent_on_implicit_bucket_creation.
        assert len(_events) == 1
        self.app.get(bucket_url, headers=self.headers)
        # Bucket shouldn't be created again, so there shouldn't be any
        # more events.
        assert len(_events) == 1

    def test_second_call_on_default_bucket_collection_doesnt_send_create_events(self):
        collection_url = "/buckets/default/collections/articles"
        self.app.get(collection_url, headers=self.headers)
        # Events are generated -- they're the same event from
        # test_an_event_is_sent_on_implicit_collection_creation.
        assert len(_events) == 2
        self.app.get(collection_url, headers=self.headers)
        # Neither the bucket nor the collection should be created
        # again, so there shouldn't be any more events.
        assert len(_events) == 2


class ReadonlyDefaultBucket(DefaultBucketWebTest):
    @classmethod
    def get_app_settings(cls, extras=None):
        settings = super().get_app_settings(extras)
        settings["readonly"] = True
        return settings

    def test_implicit_creation_is_rejected(self):
        self.app.get("/buckets/default", headers=self.headers, status=405)


class BackendErrorTest(DefaultBucketWebTest):
    def setUp(self):
        super().setUp()
        self.patcher = mock.patch.object(
            self.storage, "create", side_effect=storage_exceptions.BackendError()
        )
        self.addCleanup(self.patcher.stop)

    def test_implicit_bucket_creation_raises_503_if_backend_fails(self):
        self.patcher.start()
        self.app.get("/buckets/default", headers=self.headers, status=503)

    def test_implicit_collection_creation_raises_503_if_backend_fails(self):
        self.app.get("/buckets/default", headers=self.headers)
        self.patcher.start()
        self.app.get("/buckets/default/collections/articles", headers=self.headers, status=503)
