# Copyright 2010 OpenStack Foundation
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import uuid

from oslo.utils import timeutils
import routes
import webob
import webob.dec
import webob.request

from cinder.api.middleware import auth
from cinder.api.middleware import fault
from cinder.api.openstack import wsgi as os_wsgi
from cinder.api import urlmap
from cinder.api.v2 import limits
from cinder.api.v2 import router
from cinder.api import versions
from cinder import context
from cinder import wsgi


FAKE_UUID = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa'
FAKE_UUIDS = {}


class Context(object):
    pass


class FakeRouter(wsgi.Router):
    def __init__(self, ext_mgr=None):
        pass

    @webob.dec.wsgify
    def __call__(self, req):
        res = webob.Response()
        res.status = '200'
        res.headers['X-Test-Success'] = 'True'
        return res


@webob.dec.wsgify
def fake_wsgi(self, req):
    return self.application


def wsgi_app(inner_app_v2=None, fake_auth=True, fake_auth_context=None,
             use_no_auth=False, ext_mgr=None):
    if not inner_app_v2:
        inner_app_v2 = router.APIRouter(ext_mgr)

    if fake_auth:
        if fake_auth_context is not None:
            ctxt = fake_auth_context
        else:
            ctxt = context.RequestContext('fake', 'fake', auth_token=True)
        api_v2 = fault.FaultWrapper(auth.InjectContext(ctxt,
                                                       inner_app_v2))
    elif use_no_auth:
        api_v2 = fault.FaultWrapper(auth.NoAuthMiddleware(
            limits.RateLimitingMiddleware(inner_app_v2)))
    else:
        api_v2 = fault.FaultWrapper(auth.AuthMiddleware(
            limits.RateLimitingMiddleware(inner_app_v2)))

    mapper = urlmap.URLMap()
    mapper['/v2'] = api_v2
    mapper['/'] = fault.FaultWrapper(versions.Versions())
    return mapper


class FakeToken(object):
    id_count = 0

    def __getitem__(self, key):
        return getattr(self, key)

    def __init__(self, **kwargs):
        FakeToken.id_count += 1
        self.id = FakeToken.id_count
        for k, v in kwargs.iteritems():
            setattr(self, k, v)


class FakeRequestContext(context.RequestContext):
    def __init__(self, *args, **kwargs):
        kwargs['auth_token'] = kwargs.get('auth_token', 'fake_auth_token')
        return super(FakeRequestContext, self).__init__(*args, **kwargs)


class HTTPRequest(webob.Request):

    @classmethod
    def blank(cls, *args, **kwargs):
        if args is not None:
            if args[0].find('v1') == 0:
                kwargs['base_url'] = 'http://localhost/v1'
            else:
                kwargs['base_url'] = 'http://localhost/v2'

        use_admin_context = kwargs.pop('use_admin_context', False)
        out = os_wsgi.Request.blank(*args, **kwargs)
        out.environ['cinder.context'] = FakeRequestContext(
            'fake_user',
            'fakeproject',
            is_admin=use_admin_context)
        return out


class TestRouter(wsgi.Router):
    def __init__(self, controller):
        mapper = routes.Mapper()
        mapper.resource("test", "tests",
                        controller=os_wsgi.Resource(controller))
        super(TestRouter, self).__init__(mapper)


class FakeAuthDatabase(object):
    data = {}

    @staticmethod
    def auth_token_get(context, token_hash):
        return FakeAuthDatabase.data.get(token_hash, None)

    @staticmethod
    def auth_token_create(context, token):
        fake_token = FakeToken(created_at=timeutils.utcnow(), **token)
        FakeAuthDatabase.data[fake_token.token_hash] = fake_token
        FakeAuthDatabase.data['id_%i' % fake_token.id] = fake_token
        return fake_token

    @staticmethod
    def auth_token_destroy(context, token_id):
        token = FakeAuthDatabase.data.get('id_%i' % token_id)
        if token and token.token_hash in FakeAuthDatabase.data:
            del FakeAuthDatabase.data[token.token_hash]
            del FakeAuthDatabase.data['id_%i' % token_id]


class FakeRateLimiter(object):
    def __init__(self, application):
        self.application = application

    @webob.dec.wsgify
    def __call__(self, req):
        return self.application


def get_fake_uuid(token=0):
    if token not in FAKE_UUIDS:
        FAKE_UUIDS[token] = str(uuid.uuid4())
    return FAKE_UUIDS[token]
