import time
import os
import unittest
from emuvim.test.base import SimpleTestTopology
from emuvim.dcemulator.resourcemodel import BaseResourceModel, ResourceFlavor, NotEnoughResourcesAvailable, ResourceModelRegistrar
from emuvim.dcemulator.resourcemodel.upb.simple import UpbSimpleCloudDcRM, UpbOverprovisioningCloudDcRM, UpbDummyRM



class testResourceModel(SimpleTestTopology):
    """
    Test the general resource model API and functionality.
    """

    def testBaseResourceModelApi(self):
        """
        Tast bare API without real resource madel.
        :return:
        """
        r = BaseResourceModel()
        # check if default flavors are there
        self.assertTrue(len(r._flavors) == 5)
        # check addFlavor functionality
        f = ResourceFlavor("test", {"testmetric": 42})
        r.addFlavour(f)
        self.assertTrue("test" in r._flavors)
        self.assertTrue(r._flavors.get("test").get("testmetric") == 42)

    def testAddRmToDc(self):
        """
        Test is allocate/free is called when a RM is added to a DC.
        :return:
        """
        # create network
        self.createNet(nswitches=0, ndatacenter=1, nhosts=2, ndockers=0)
        # setup links
        self.net.addLink(self.dc[0], self.h[0])
        self.net.addLink(self.h[1], self.dc[0])
        # add resource model
        r = BaseResourceModel()
        self.dc[0].assignResourceModel(r)
        # start Mininet network
        self.startNet()
        # check number of running nodes
        self.assertTrue(len(self.getContainernetContainers()) == 0)
        self.assertTrue(len(self.net.hosts) == 2)
        self.assertTrue(len(self.net.switches) == 1)
        # check resource model and resource model registrar
        self.assertTrue(self.dc[0]._resource_model is not None)
        self.assertTrue(len(self.net.rm_registrar.resource_models) == 1)

        # check if alloc was called during startCompute
        self.assertTrue(len(r._allocated_compute_instances) == 0)
        self.dc[0].startCompute("tc1")
        time.sleep(1)
        self.assertTrue(len(r._allocated_compute_instances) == 1)
        # check if free was called during stopCompute
        self.dc[0].stopCompute("tc1")
        self.assertTrue(len(r._allocated_compute_instances) == 0)
        # check connectivity by using ping
        self.assertTrue(self.net.ping([self.h[0], self.h[1]]) <= 0.0)
        # stop Mininet network
        self.stopNet()


def createDummyContainerObject(name, flavor):

    class DummyContainer(object):

        def __init__(self):
            self.cpu_period = -1
            self.cpu_quota = -1
            self.mem_limit = -1
            self.memswap_limit = -1

        def updateCpuLimit(self, cpu_period, cpu_quota):
            self.cpu_period = cpu_period
            self.cpu_quota = cpu_quota

        def updateMemoryLimit(self, mem_limit):
            self.mem_limit = mem_limit

    d = DummyContainer()
    d.name = name
    d.flavor_name = flavor
    return d




class testUpbSimpleCloudDcRM(SimpleTestTopology):
    """
    Test the UpbSimpleCloudDc resource model.
    """

    def testAllocationComputations(self):
        """
        Test the allocation procedures and correct calculations.
        :return:
        """
        # config
        E_CPU = 1.0
        MAX_CU = 100
        E_MEM = 512
        MAX_MU = 2048
        # create dummy resource model environment
        reg = ResourceModelRegistrar(dc_emulation_max_cpu=E_CPU, dc_emulation_max_mem=E_MEM)
        rm = UpbSimpleCloudDcRM(max_cu=MAX_CU, max_mu=MAX_MU)
        reg.register("test_dc", rm)

        c1 = createDummyContainerObject("c1", flavor="tiny")
        rm.allocate(c1)  # calculate allocation
        self.assertEqual(float(c1.cpu_quota) / c1.cpu_period, E_CPU / MAX_CU * 0.5)   # validate compute result
        self.assertEqual(float(c1.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 32)   # validate memory result

        c2 = createDummyContainerObject("c2", flavor="small")
        rm.allocate(c2)  # calculate allocation
        self.assertEqual(float(c2.cpu_quota) / c2.cpu_period, E_CPU / MAX_CU * 1)   # validate compute result
        self.assertEqual(float(c2.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 128)   # validate memory result

        c3 = createDummyContainerObject("c3", flavor="medium")
        rm.allocate(c3)  # calculate allocation
        self.assertEqual(float(c3.cpu_quota) / c3.cpu_period, E_CPU / MAX_CU * 4)   # validate compute result
        self.assertEqual(float(c3.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 256)   # validate memory result

        c4 = createDummyContainerObject("c4", flavor="large")
        rm.allocate(c4)  # calculate allocation
        self.assertEqual(float(c4.cpu_quota) / c4.cpu_period, E_CPU / MAX_CU * 8)   # validate compute result
        self.assertEqual(float(c4.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 512)   # validate memory result

        c5 = createDummyContainerObject("c5", flavor="xlarge")
        rm.allocate(c5)  # calculate allocation
        self.assertEqual(float(c5.cpu_quota) / c5.cpu_period, E_CPU / MAX_CU * 16)   # validate compute result
        self.assertEqual(float(c5.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 1024)   # validate memory result


    def testAllocationCpuLimit(self):
        """
        Test CPU allocation limit
        :return:
        """
        # config
        E_CPU = 1.0
        MAX_CU = 40
        E_MEM = 512
        MAX_MU = 4096
        # create dummy resource model environment
        reg = ResourceModelRegistrar(dc_emulation_max_cpu=E_CPU, dc_emulation_max_mem=E_MEM)
        rm = UpbSimpleCloudDcRM(max_cu=MAX_CU, max_mu=MAX_MU)
        reg.register("test_dc", rm)

        # test over provisioning exeption
        exception = False
        try:
            c6 = createDummyContainerObject("c6", flavor="xlarge")
            c7 = createDummyContainerObject("c7", flavor="xlarge")
            c8 = createDummyContainerObject("c8", flavor="xlarge")
            c9 = createDummyContainerObject("c9", flavor="xlarge")
            rm.allocate(c6)  # calculate allocation
            rm.allocate(c7)  # calculate allocation
            rm.allocate(c8)  # calculate allocation
            rm.allocate(c9)  # calculate allocation
        except NotEnoughResourcesAvailable as e:
            self.assertIn("Not enough compute", e.message)
            exception = True
        self.assertTrue(exception)

    def testAllocationMemLimit(self):
        """
        Test MEM allocation limit
        :return:
        """
        # config
        E_CPU = 1.0
        MAX_CU = 500
        E_MEM = 512
        MAX_MU = 2048
        # create dummy resource model environment
        reg = ResourceModelRegistrar(dc_emulation_max_cpu=E_CPU, dc_emulation_max_mem=E_MEM)
        rm = UpbSimpleCloudDcRM(max_cu=MAX_CU, max_mu=MAX_MU)
        reg.register("test_dc", rm)

        # test over provisioning exeption
        exception = False
        try:
            c6 = createDummyContainerObject("c6", flavor="xlarge")
            c7 = createDummyContainerObject("c7", flavor="xlarge")
            c8 = createDummyContainerObject("c8", flavor="xlarge")
            rm.allocate(c6)  # calculate allocation
            rm.allocate(c7)  # calculate allocation
            rm.allocate(c8)  # calculate allocation
        except NotEnoughResourcesAvailable as e:
            self.assertIn("Not enough memory", e.message)
            exception = True
        self.assertTrue(exception)

    def testFree(self):
        """
        Test the free procedure.
        :return:
        """
        # config
        E_CPU = 1.0
        MAX_CU = 100
        # create dummy resource model environment
        reg = ResourceModelRegistrar(dc_emulation_max_cpu=1.0, dc_emulation_max_mem=512)
        rm = UpbSimpleCloudDcRM(max_cu=100, max_mu=100)
        reg.register("test_dc", rm)
        c1 = createDummyContainerObject("c6", flavor="tiny")
        rm.allocate(c1)  # calculate allocation
        self.assertTrue(rm.dc_alloc_cu == 0.5)
        rm.free(c1)
        self.assertTrue(rm.dc_alloc_cu == 0)

    @unittest.skipIf(os.environ.get("SON_EMU_IN_DOCKER") is not None,
                     "skipping test when running inside Docker container")
    def testInRealTopo(self):
        """
        Start a real container and check if limitations are really passed down to Conteinernet.
        :return:
        """
        # create network
        self.createNet(nswitches=0, ndatacenter=1, nhosts=2, ndockers=0)
        # setup links
        self.net.addLink(self.dc[0], self.h[0])
        self.net.addLink(self.h[1], self.dc[0])
        # add resource model
        r = UpbSimpleCloudDcRM(max_cu=100, max_mu=100)
        self.dc[0].assignResourceModel(r)
        # start Mininet network
        self.startNet()
        # check number of running nodes
        self.assertTrue(len(self.getContainernetContainers()) == 0)
        self.assertTrue(len(self.net.hosts) == 2)
        self.assertTrue(len(self.net.switches) == 1)
        # check resource model and resource model registrar
        self.assertTrue(self.dc[0]._resource_model is not None)
        self.assertTrue(len(self.net.rm_registrar.resource_models) == 1)

        # check if alloc was called during startCompute
        self.assertTrue(len(r._allocated_compute_instances) == 0)
        tc1 = self.dc[0].startCompute("tc1", flavor_name="tiny")
        time.sleep(1)
        self.assertTrue(len(r._allocated_compute_instances) == 1)

        # check if there is a real limitation set for containers cgroup
        # deactivated for now, seems not to work in docker-in-docker setup used in CI
        self.assertEqual(float(tc1.cpu_quota)/tc1.cpu_period, 0.005)

        # check if free was called during stopCompute
        self.dc[0].stopCompute("tc1")
        self.assertTrue(len(r._allocated_compute_instances) == 0)
        # check connectivity by using ping
        self.assertTrue(self.net.ping([self.h[0], self.h[1]]) <= 0.0)
        # stop Mininet network
        self.stopNet()


class testUpbOverprovisioningCloudDcRM(SimpleTestTopology):
    """
    Test the UpbOverprovisioningCloudDc resource model.
    """

    def testAllocationComputations(self):
        """
        Test the allocation procedures and correct calculations.
        :return:
        """
        # config
        E_CPU = 1.0
        MAX_CU = 3
        E_MEM = 512
        MAX_MU = 2048
        # create dummy resource model environment
        reg = ResourceModelRegistrar(dc_emulation_max_cpu=E_CPU, dc_emulation_max_mem=E_MEM)
        rm = UpbOverprovisioningCloudDcRM(max_cu=MAX_CU, max_mu=MAX_MU)
        reg.register("test_dc", rm)

        c1 = createDummyContainerObject("c1", flavor="small")
        rm.allocate(c1)  # calculate allocation
        self.assertAlmostEqual(float(c1.cpu_quota) / c1.cpu_period, E_CPU / MAX_CU * 1.0, places=5)
        self.assertAlmostEqual(float(c1.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 128)
        self.assertAlmostEqual(rm.cpu_op_factor, 1.0)

        c2 = createDummyContainerObject("c2", flavor="small")
        rm.allocate(c2)  # calculate allocation
        self.assertAlmostEqual(float(c2.cpu_quota) / c2.cpu_period, E_CPU / MAX_CU * 1.0, places=5)
        self.assertAlmostEqual(float(c2.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 128)
        self.assertAlmostEqual(rm.cpu_op_factor, 1.0)

        c3 = createDummyContainerObject("c3", flavor="small")
        rm.allocate(c3)  # calculate allocation
        self.assertAlmostEqual(float(c3.cpu_quota) / c3.cpu_period, E_CPU / MAX_CU * 1.0, places=5)
        self.assertAlmostEqual(float(c3.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 128)
        self.assertAlmostEqual(rm.cpu_op_factor, 1.0)

        # from this container onwards, we should go to over provisioning mode:
        c4 = createDummyContainerObject("c4", flavor="small")
        rm.allocate(c4)  # calculate allocation
        self.assertAlmostEqual(float(c4.cpu_quota) / c4.cpu_period, E_CPU / MAX_CU * (float(3) / 4), places=5)
        self.assertAlmostEqual(float(c4.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 128, places=5)
        self.assertAlmostEqual(rm.cpu_op_factor, 0.75)

        c5 = createDummyContainerObject("c5", flavor="small")
        rm.allocate(c5)  # calculate allocation
        self.assertAlmostEqual(float(c5.cpu_quota) / c5.cpu_period, E_CPU / MAX_CU * (float(3) / 5), places=5)
        self.assertAlmostEqual(float(c5.mem_limit/1024/1024), float(E_MEM) / MAX_MU * 128)
        self.assertAlmostEqual(rm.cpu_op_factor, 0.6)


class testUpbDummyRM(SimpleTestTopology):
    """
    Test the UpbDummyRM resource model.
    """

    def testAllocationComputations(self):
        """
        Test the allocation procedures and correct calculations.
        :return:
        """
        # config
        E_CPU = 1.0
        MAX_CU = 3
        E_MEM = 512
        MAX_MU = 2048
        # create dummy resource model environment
        reg = ResourceModelRegistrar(dc_emulation_max_cpu=E_CPU, dc_emulation_max_mem=E_MEM)
        rm = UpbDummyRM(max_cu=MAX_CU, max_mu=MAX_MU)
        reg.register("test_dc", rm)

        c1 = createDummyContainerObject("c1", flavor="small")
        rm.allocate(c1)  # calculate allocation
        self.assertEqual(len(rm._allocated_compute_instances), 1)

        c2 = createDummyContainerObject("c2", flavor="small")
        rm.allocate(c2)  # calculate allocation
        self.assertEqual(len(rm._allocated_compute_instances), 2)

