# 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 TestScheduling(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
        event_loop = xossynchronizer.event_loop

        reload(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_same_object_trivial(self):
        s = Slice(pk=4)
        t = Slice(pk=4)
        same, t = self.synchronizer.same_object(s, t)
        self.assertTrue(same)
        self.assertEqual(t, event_loop.DIRECT_EDGE)

    def test_same_object_trivial2(self):
        s = Slice(pk=4)
        t = Slice(pk=5)
        same, t = self.synchronizer.same_object(s, t)
        self.assertFalse(same)

    def test_same_object_lst(self):
        s = Slice(pk=5)
        t = ControllerSlice(slice=s)
        u = ControllerSlice(slice=s)

        s.controllerslices = mock_enumerator([t, u])

        same, et = self.synchronizer.same_object(s.controllerslices, u)
        self.assertTrue(same)
        self.assertEqual(et, event_loop.PROXY_EDGE)

        same, et = self.synchronizer.same_object(s.controllerslices, t)

        self.assertTrue(same)
        self.assertEqual(et, event_loop.PROXY_EDGE)

    def test_same_object_lst_dc(self):
        r = Slice(pk=4)
        s = Slice(pk=5)
        t = ControllerSlice(slice=r)
        u = ControllerSlice(slice=s)

        s.controllerslices = mock_enumerator([u])

        same, et = self.synchronizer.same_object(s.controllerslices, t)
        self.assertFalse(same)

        same, et = self.synchronizer.same_object(s.controllerslices, u)
        self.assertTrue(same)

    def test_concrete_path_no_model_path(self):
        p = Port()
        n = NetworkParameter()
        verdict, _ = self.synchronizer.concrete_path_exists(p, n)
        self.assertFalse(verdict)

    def test_concrete_no_object_path_adjacent(self):
        p = Instance()
        s1 = Slice()
        s2 = Slice()
        p.slice = s2
        verdict, _ = self.synchronizer.concrete_path_exists(p, s1)

        self.assertFalse(verdict)

    def test_concrete_object_path_adjacent(self):
        p = Instance()
        s = Slice()
        p.slice = s
        verdict, edge_type = self.synchronizer.concrete_path_exists(p, s)

        self.assertTrue(verdict)
        self.assertEqual(edge_type, event_loop.DIRECT_EDGE)

    def test_concrete_object_controller_path_adjacent(self):
        p = Instance()
        q = Instance()
        cs = ControllerSlice()
        cs2 = ControllerSlice()
        s1 = Slice()
        s2 = Slice()
        p.slice = s1
        q.slice = s2
        cs.slice = s1
        s1.controllerslices = mock_enumerator([cs])
        s2.controllerslices = mock_enumerator([])

        verdict1, edge_type1 = self.synchronizer.concrete_path_exists(p, cs)
        verdict2, _ = self.synchronizer.concrete_path_exists(q, cs)
        verdict3, _ = self.synchronizer.concrete_path_exists(p, cs2)

        self.assertTrue(verdict1)
        self.assertFalse(verdict2)
        self.assertFalse(verdict3)

        # TODO(smbaker): This assert was found to be failing. Understand whether the library or the test is at fault.
        #self.assertEqual(edge_type1, event_loop.PROXY_EDGE)

    def test_concrete_object_controller_path_distant(self):
        p = Instance()
        s = Slice()
        t = Site()
        ct = ControllerSite()
        ct.site = t
        p.slice = s
        s.site = t
        verdict = self.synchronizer.concrete_path_exists(p, ct)
        self.assertTrue(verdict)

    def test_concrete_object_path_distant(self):
        p = Instance()
        s = Slice()
        t = Site()
        p.slice = s
        s.site = t
        verdict = self.synchronizer.concrete_path_exists(p, t)
        self.assertTrue(verdict)

    def test_concrete_no_object_path_distant(self):
        p = Instance()
        s = Slice()
        s.controllerslice = mock_enumerator([])

        t = Site()
        t.controllersite = mock_enumerator([])

        ct = ControllerSite()
        ct.site = Site()
        p.slice = s
        s.site = t

        verdict, _ = self.synchronizer.concrete_path_exists(p, ct)
        self.assertFalse(verdict)

    def test_cohorting_independent(self):
        i = Image()

        p = Slice()
        c = Instance()
        c.slice = None
        c.image = None

        cohorts = self.synchronizer.compute_dependent_cohorts([i, p, c], False)
        self.assertEqual(len(cohorts), 3)

    def test_cohorting_related(self):
        i = Image()
        p = Port()
        c = Instance()
        c.image = i
        s = ControllerSlice()

        cohorts = self.synchronizer.compute_dependent_cohorts([i, p, c, s], False)
        self.assertIn([i, c], cohorts)
        self.assertIn([p], cohorts)
        self.assertIn([s], cohorts)

    def test_cohorting_related_multi(self):
        i = Image()
        p = Port()
        c = Instance()
        c.image = i
        cs = ControllerSlice()
        s = Slice()
        cs.slice = s
        s.controllerslices = mock_enumerator([cs])
        c.slice = s

        cohorts = self.synchronizer.compute_dependent_cohorts([i, p, c, s, cs], False)

        big_cohort = max(cohorts, key=len)
        self.assertGreater(big_cohort.index(c), big_cohort.index(i))
        # TODO(smbaker): This assert was found to be failing. Understand whether the library or the test is at fault.
        #self.assertGreater(big_cohort.index(cs), big_cohort.index(s))
        self.assertIn([p], cohorts)

    def test_cohorting_related_multi_delete(self):
        i = Image()
        p = Port()
        c = Instance()
        c.image = i
        cs = ControllerSlice()
        s = Slice()
        cs.slice = s
        c.slice = s

        cohorts = self.synchronizer.compute_dependent_cohorts([i, p, c, s, cs], True)

        big_cohort = max(cohorts, key=len)
        self.assertGreater(big_cohort.index(i), big_cohort.index(c))
        self.assertGreater(big_cohort.index(s), big_cohort.index(cs))
        self.assertIn([p], cohorts)

    def test_cohorting_related_delete(self):
        i = Image()
        p = Port()
        c = Instance()
        c.image = i
        s = ControllerSlice()

        cohorts = self.synchronizer.compute_dependent_cohorts([i, p, c, s], True)
        self.assertIn([c, i], cohorts)
        self.assertIn([p], cohorts)
        self.assertIn([s], cohorts)


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