# Copyright 2017-present Open Networking Foundation
#
# 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 unittest
from mock import patch
import mock
import pdb
import networkx as nx

import os
import sys

test_path = os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
sync_lib_dir = os.path.join(test_path, "..", "xossynchronizer")
xos_dir = os.path.join(test_path, "..", "..", "..", "xos")


class TestControllerDependencies(unittest.TestCase):

    def setUp(self):
        global mock_enumerator, event_loop

        self.sys_path_save = sys.path
        self.cwd_save = os.getcwd()

        config = os.path.join(test_path, "test_config.yaml")
        from xosconfig import Config

        Config.clear()
        Config.init(config, "synchronizer-config-schema.yaml")

        from xossynchronizer.mock_modelaccessor_build import (
            build_mock_modelaccessor,
        )

        build_mock_modelaccessor(sync_lib_dir, xos_dir, services_dir=None, service_xprotos=[])

        os.chdir(os.path.join(test_path, ".."))  # config references xos-synchronizer-tests/model-deps

        import xossynchronizer.event_loop
        reload(xossynchronizer.event_loop)
        event_loop = xossynchronizer.event_loop

        import xossynchronizer.backend
        reload(xossynchronizer.backend)

        from xossynchronizer.modelaccessor import model_accessor

        from mock_modelaccessor import mock_enumerator

        # import all class names to globals
        for (k, v) in model_accessor.all_model_classes.items():
            globals()[k] = v

        b = xossynchronizer.backend.Backend(model_accessor=model_accessor)
        steps_dir = Config.get("steps_dir")
        self.steps = b.load_sync_step_modules(steps_dir)
        self.synchronizer = xossynchronizer.event_loop.XOSObserver(self.steps, model_accessor)

    def tearDown(self):
        sys.path = self.sys_path_save
        os.chdir(self.cwd_save)

    def test_multi_controller_path(self):
        csl = ControllerSlice()
        csi = ControllerSite()
        site = Site()
        slice = Slice()
        slice.site = site
        csl.slice = slice
        csi.site = site
        slice.controllerslices = mock_enumerator([csl])
        site.controllersite = mock_enumerator([csi])

        verdict, edge_type = self.synchronizer.concrete_path_exists(csl, csi)
        self.assertTrue(verdict)

        # TODO(smbaker): event_loop.PROXY_EDGE is set to the wrong thing
        # self.assertEqual(edge_type, event_loop.PROXY_EDGE)

    def test_controller_path_simple(self):
        p = Instance()
        s = Slice()
        t = Site()
        ct = ControllerSite()
        p.slice = s
        s.site = t
        ct.site = t
        t.controllersite = mock_enumerator([ct])
        cohorts = self.synchronizer.compute_dependent_cohorts([p, ct], False)
        self.assertEqual([ct, p], cohorts[0])
        cohorts = self.synchronizer.compute_dependent_cohorts([ct, p], False)
        self.assertEqual([ct, p], cohorts[0])

    def test_controller_deletion_path(self):
        p = Instance()
        s = Slice()
        t = Site()
        ct = ControllerSite()
        ct.site = t
        p.slice = s
        s.site = t

        t.controllersite = mock_enumerator([ct])

        cohorts = self.synchronizer.compute_dependent_cohorts([p, s, t, ct], False)
        self.assertIn(t, cohorts[0])
        self.assertIn(ct, cohorts[0])
        self.assertIn(s, cohorts[0])
        self.assertIn(p, cohorts[0])
        # TODO(smbaker): This assert was found to be failing. Understand whether the library or the test is at fault.
        #self.assertEqual([t, ct, s, p], cohorts[0])

        cohorts = self.synchronizer.compute_dependent_cohorts([p, s, t, ct], True)
        self.assertIn(t, cohorts[0])
        self.assertIn(ct, cohorts[0])
        self.assertIn(s, cohorts[0])
        self.assertIn(p, cohorts[0])
        # TODO(smbaker): This assert was found to be failing. Understand whether the library or the test is at fault.
        #self.assertEqual([p, s, ct, t], cohorts[0])

    def test_multi_controller_schedule(self):
        csl = ControllerSlice()
        csi = ControllerSite()
        site = Site()
        slice = Slice()
        slice.site = site
        csl.slice = slice
        csi.site = site
        slice.controllerslices = mock_enumerator([csl])
        site.controllersite = mock_enumerator([csi])
        i = Instance()
        i.slice = slice

        cohorts = self.synchronizer.compute_dependent_cohorts(
            [i, slice, site, csl, csi], False
        )
        self.assertIn(site, cohorts[0])
        self.assertIn(csi, cohorts[0])
        self.assertIn(slice, cohorts[0])
        self.assertIn(csl, cohorts[0])
        self.assertIn(i, cohorts[0])

        # TODO(smbaker): This assert was found to be failing. Understand whether the library or the test is at fault.
        #self.assertEqual([site, csi, slice, csl, i], cohorts[0])

    def test_multi_controller_path_negative(self):
        csl = ControllerSlice()
        csi = ControllerSite()
        site = Site()
        slice = Slice()
        slice.site = site
        csl.slice = slice
        csi.site = site
        slice.controllerslices = mock_enumerator([])
        site.controllersite = mock_enumerator([])

        verdict, edge_type = self.synchronizer.concrete_path_exists(csl, csi)
        self.assertFalse(verdict)
        self.assertEqual(edge_type, None)

    def test_controller_path_simple_negative(self):
        p = Instance()
        s = Slice()
        t = Site()
        ct = ControllerSite()
        p.slice = s
        s.site = t
        ct.site = t
        t.controllersite = mock_enumerator([])
        cohorts = self.synchronizer.compute_dependent_cohorts([p, ct], False)
        self.assertIn([ct], cohorts)
        self.assertIn([p], cohorts)

    def test_controller_deletion_path_negative(self):
        p = Instance()
        s = Slice()
        t = Site()
        ct = ControllerSite()
        s.site = t

        t.controllersite = mock_enumerator([])

        cohorts = self.synchronizer.compute_dependent_cohorts([p, s, t, ct], False)
        self.assertIn([t, s], cohorts)
        self.assertIn([p], cohorts)
        self.assertIn([ct], cohorts)
        cohorts = self.synchronizer.compute_dependent_cohorts([p, s, t, ct], True)
        self.assertIn([s, t], cohorts)
        self.assertIn([p], cohorts)
        self.assertIn([ct], cohorts)

    def DISABLED_test_multi_controller_deletion_schedule(self):
        # TODO(smbaker): `csi` is undefined, test is broken as written.

        csl = ControllerSlice()
        cn = ControllerNetwork()
        site = Site()
        slice = Slice()
        slice.site = site
        slice.controllerslices = mock_enumerator([])
        site.controllersite = mock_enumerator([])
        i = Instance()
        i.slice = slice

        cohorts = self.synchronizer.compute_dependent_cohorts(
            [i, slice, site, csl, csi], False
        )
        self.assertIn([site, slice, i], cohorts)
        self.assertIn([csl], cohorts)
        self.assertIn([csi], cohorts)

    def test_multi_controller_schedule_negative(self):
        csl = ControllerSlice()
        csi = ControllerSite()
        site = Site()
        slice = Slice()
        slice.site = site
        slice.controllerslices = mock_enumerator([])
        site.controllersite = mock_enumerator([])
        i = Instance()
        i.slice = slice

        cohorts = self.synchronizer.compute_dependent_cohorts(
            [i, slice, site, csl, csi], False
        )
        self.assertIn([site, slice, i], cohorts)
        self.assertIn([csl], cohorts)
        self.assertIn([csi], cohorts)


if __name__ == "__main__":
    unittest.main()