# Copyright (C) 2015 UCSC Computational Genomics Lab
#
# 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 logging
import os

import subprocess
from toil.version import exactPython
from abc import abstractmethod

import pytest
from uuid import uuid4


from toil.test import needs_google, integrative, ToilTest, needs_appliance, timeLimit, slow

log = logging.getLogger(__name__)


@needs_google
@integrative
@needs_appliance
@slow
class AbstractGCEAutoscaleTest(ToilTest):
    projectID = os.getenv('TOIL_GOOGLE_PROJECTID')

    def sshUtil(self, command):
        baseCommand = ['toil', 'ssh-cluster', '--insecure', '-p=gce', self.clusterName]
        callCommand = baseCommand + command
        subprocess.check_call(callCommand)

    def rsyncUtil(self, src, dest):
        baseCommand = ['toil', 'rsync-cluster', '--insecure', '-p=gce', self.clusterName]
        callCommand = baseCommand + [src, dest]
        subprocess.check_call(callCommand)

    def destroyClusterUtil(self):
        callCommand = ['toil', 'destroy-cluster', '-p=gce', self.clusterName]
        subprocess.check_call(callCommand)

    def createClusterUtil(self, args=None):
        if args is None:
            args = []
        callCommand = ['toil', 'launch-cluster', self.clusterName, '-p=gce', '--keyPairName=%s' % self.keyName,
                       '--leaderNodeType=%s' % self.leaderInstanceType, '--zone=%s' % self.googleZone]
        if self.botoDir is not None:
            callCommand += ['--boto=%s' % self.botoDir]
        callCommand = callCommand + args if args else callCommand
        log.info("createClusterUtil: %s" % ''.join(callCommand))
        subprocess.check_call(callCommand)

    def cleanJobStoreUtil(self):
        callCommand = ['toil', 'clean', self.jobStore]
        subprocess.check_call(callCommand)

    def __init__(self, methodName):
        super(AbstractGCEAutoscaleTest, self).__init__(methodName=methodName)
        # TODO: add TOIL_GOOGLE_KEYNAME to needs_google or ssh with SA account
        self.keyName = os.getenv('TOIL_GOOGLE_KEYNAME')
        # TODO: remove this when switching to google jobstore
        self.botoDir = os.getenv('TOIL_BOTO_DIR')
        # TODO: get this from SA account or add an environment variable
        self.googleZone = 'us-west1-a'


        self.leaderInstanceType = 'n1-standard-1'
        self.instanceTypes = ["n1-standard-2"]
        self.numWorkers = ['2']
        self.numSamples = 2
        self.spotBid = 0.15

    def setUp(self):
        super(AbstractGCEAutoscaleTest, self).setUp()

    def tearDown(self):
        super(AbstractGCEAutoscaleTest, self).tearDown()
        self.destroyClusterUtil()
        self.cleanJobStoreUtil()

    #def getMatchingRoles(self, clusterName):
    #    ctx = AWSProvisioner._buildContext(clusterName)
    #    roles = list(ctx.local_roles())
    #    return roles

    def launchCluster(self):
        self.createClusterUtil()

    @abstractmethod
    def _getScript(self):
        """
        Download the test script needed by the inheriting unit test class.
        """
        raise NotImplementedError()


    @abstractmethod
    def _runScript(self, toilOptions):
        """
        Modify the provided Toil options to suit the test Toil script, then run the script with
        those arguments.

        :param toilOptions: List of Toil command line arguments. This list may need to be
               modified to suit the test script's requirements.
        """
        raise NotImplementedError()

    def _test(self, preemptableJobs=False):
        """
        Does the work of the testing. Many features' test are thrown in here is no particular
        order
        """
        self.launchCluster()

        # TODO: What is the point of this test?
        #assert len(self.getMatchingRoles(self.clusterName)) == 1

        # TODO: Add a check of leader and node storage size if set.

        # --never-download prevents silent upgrades to pip, wheel and setuptools
        venv_command = ['virtualenv', '--system-site-packages', '--never-download',
                        '--python', exactPython, '/home/venv']
        self.sshUtil(venv_command)

        upgrade_command = ['/home/venv/bin/pip', 'install', 'setuptools==28.7.1']
        self.sshUtil(upgrade_command)

        yaml_command = ['/home/venv/bin/pip', 'install', 'pyyaml==3.12']
        self.sshUtil(yaml_command)

        self._getScript()

        toilOptions = [self.jobStore,
                       '--batchSystem=mesos',
                       '--workDir=/var/lib/toil',
                       '--clean=always',
                       '--retryCount=2',
                       '--clusterStats=/home/',
                       '--logDebug',
                       '--logFile=/home/sort.log',
                       '--provisioner=gce']

        toilOptions.extend(['--nodeTypes=' + ",".join(self.instanceTypes),
                            '--maxNodes=%s' % ",".join(self.numWorkers)])
        if preemptableJobs:
            toilOptions.extend(['--defaultPreemptable'])

        self._runScript(toilOptions)

        #TODO: Does this just check if it is still running?
        #assert len(self.getMatchingRoles(self.clusterName)) == 1

        checkStatsCommand = ['/home/venv/bin/python', '-c',
                             'import json; import os; '
                             'json.load(open("/home/" + [f for f in os.listdir("/home/") '
                                                   'if f.endswith(".json")].pop()))'
                             ]

        self.sshUtil(checkStatsCommand)


        # TODO: Add a check to make sure everything is cleaned up.



@pytest.mark.timeout(1600)
class GCEAutoscaleTest(AbstractGCEAutoscaleTest):

    def __init__(self, name):
        super(GCEAutoscaleTest, self).__init__(name)
        self.clusterName = 'provisioner-test-' + str(uuid4())
        self.requestedLeaderStorage = 80

    def setUp(self):
        super(GCEAutoscaleTest, self).setUp()
        self.jobStore = 'google:%s:autoscale-%s' % (self.projectID, uuid4())

    def _getScript(self):
        # TODO: Isn't this the key file?
        fileToSort = os.path.join(os.getcwd(), str(uuid4()))
        with open(fileToSort, 'w') as f:
            # Fixme: making this file larger causes the test to hang
            f.write('01234567890123456789012345678901')
        self.rsyncUtil(os.path.join(self._projectRootPath(), 'src/toil/test/sort/sort.py'), ':/home/sort.py')
        self.rsyncUtil(fileToSort, ':/home/sortFile')
        os.unlink(fileToSort)

    def _runScript(self, toilOptions):
        runCommand = ['/home/venv/bin/python', '/home/sort.py', '--fileToSort=/home/sortFile']
        #'--sseKey=/home/sortFile']
        runCommand.extend(toilOptions)
        log.info("_runScript: %s" % ''.join(runCommand))
        self.sshUtil(runCommand)

    def launchCluster(self):
        # add arguments to test that we can specify leader storage
        self.createClusterUtil(args=['--leaderStorage', str(self.requestedLeaderStorage)])

    # TODO: aren't these checks inherited?
    @integrative
    @needs_google
    def testAutoScale(self):
        self.instanceTypes = ["n1-standard-2"]
        self.numWorkers = ['2']
        self._test()

    @integrative
    @needs_google
    def testSpotAutoScale(self):
        self.instanceTypes = ["n1-standard-2:%f" % self.spotBid]
        # Some spot workers have a stopped state after being started, strangely.
        # This could be the natural preemption process, but it seems too rapid.
        self.numWorkers = ['3'] # Try 3 to account for a stopped node.
        self._test(preemptableJobs=True)


@pytest.mark.timeout(1600)
class GCEStaticAutoscaleTest(GCEAutoscaleTest):
    """
    Runs the tests on a statically provisioned cluster with autoscaling enabled.
    """
    def __init__(self, name):
        super(GCEStaticAutoscaleTest, self).__init__(name)
        self.requestedNodeStorage = 20

    def launchCluster(self):
        self.createClusterUtil(args=['--leaderStorage', str(self.requestedLeaderStorage),
                                     '--nodeTypes', ",".join(self.instanceTypes), '-w', ",".join(self.numWorkers),
                                     '--nodeStorage', str(self.requestedLeaderStorage)])

        # TODO: check the number of workers and their storage
        #nodes = AWSProvisioner._getNodesInCluster(ctx, self.clusterName, both=True)
        #nodes.sort(key=lambda x: x.launch_time)
        # assuming that leader is first
        #workers = nodes[1:]
        # test that two worker nodes were created
        #self.assertEqual(2, len(workers))
        # test that workers have expected storage size
        # just use the first worker
        #worker = workers[0]
        #worker = next(wait_instances_running(ctx.ec2, [worker]))
        #rootBlockDevice = worker.block_device_mapping["/dev/xvda"]
        #self.assertTrue(isinstance(rootBlockDevice, BlockDeviceType))
        #rootVolume = ctx.ec2.get_all_volumes(volume_ids=[rootBlockDevice.volume_id])[0]
        #self.assertGreaterEqual(rootVolume.size, self.requestedNodeStorage)

    def _runScript(self, toilOptions):
        runCommand = ['/home/venv/bin/python', '/home/sort.py', '--fileToSort=/home/sortFile']
        runCommand.extend(toilOptions)
        log.info("_runScript: %s" % ''.join(runCommand))
        self.sshUtil(runCommand)


@pytest.mark.timeout(1800)
class GCEAutoscaleTestMultipleNodeTypes(AbstractGCEAutoscaleTest):

    def __init__(self, name):
        super(GCEAutoscaleTestMultipleNodeTypes, self).__init__(name)
        self.clusterName = 'provisioner-test-' + str(uuid4())

    def setUp(self):
        super(GCEAutoscaleTestMultipleNodeTypes, self).setUp()
        self.jobStore = 'google:%s:multinode-%s' % (self.projectID, uuid4())

    def _getScript(self):
        sseKeyFile = os.path.join(os.getcwd(), 'keyFile')
        with open(sseKeyFile, 'w') as f:
            f.write('01234567890123456789012345678901')
        self.rsyncUtil(os.path.join(self._projectRootPath(), 'src/toil/test/sort/sort.py'), ':/home/sort.py')
        self.rsyncUtil(sseKeyFile, ':/home/keyFile')
        os.unlink(sseKeyFile)

    def _runScript(self, toilOptions):
        #Set memory requirements so that sort jobs can be run
        # on small instances, but merge jobs must be run on large
        # instances
        runCommand = ['/home/venv/bin/python', '/home/sort.py', '--fileToSort=/home/s3am/bin/asadmin', '--sortMemory=0.6G', '--mergeMemory=3.0G']
        runCommand.extend(toilOptions)
        #runCommand.append('--sseKey=/home/keyFile')
        log.info("_runScript: %s" % ''.join(runCommand))
        self.sshUtil(runCommand)

    @integrative
    @needs_google
    def testAutoScale(self):
        self.instanceTypes = ["n1-standard-2", "n1-standard-4"]
        self.numWorkers = ['2','1']
        self._test()

@pytest.mark.timeout(1800)
class GCERestartTest(AbstractGCEAutoscaleTest):
    """
    This test insures autoscaling works on a restarted Toil run
    """

    def __init__(self, name):
        super(GCERestartTest, self).__init__(name)
        self.clusterName = 'restart-test-' + str(uuid4())

    def setUp(self):
        super(GCERestartTest, self).setUp()
        self.instanceTypes = ['n1-standard-1']
        self.numWorkers = ['1']
        self.scriptName = "/home/restartScript.py"
        # TODO: replace this with a google job store
        zone = 'us-west-2'
        self.jobStore = 'google:%s:restart-%s' % (self.projectID, uuid4())

    def _getScript(self):
        self.rsyncUtil(os.path.join(self._projectRootPath(), 'src/toil/test/provisioners/restartScript.py'),
                        ':'+self.scriptName)


    def _runScript(self, toilOptions):
        # clean = onSuccess
        disallowedOptions = ['--clean=always', '--retryCount=2']
        newOptions = [option for option in toilOptions if option not in disallowedOptions]
        try:
            # include a default memory - on restart the minimum memory requirement is the default, usually 2 GB
            command = ['/home/venv/bin/python', self.scriptName, '-e', 'FAIL=true', '--defaultMemory=50000000']
            command.extend(newOptions)
            self.sshUtil(command)
        except subprocess.CalledProcessError:
            pass
        else:
            self.fail('Command succeeded when we expected failure')
        with timeLimit(1200):
            command = ['/home/venv/bin/python', self.scriptName, '--restart', '--defaultMemory=50000000']
            command.extend(toilOptions)
            self.sshUtil(command)

    @integrative
    def testAutoScaledCluster(self):
        self._test()

