#  Copyright (C) 2020  Red Hat, Inc. <http://www.redhat.com>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License along
#  with this program; if not, write to the Free Software Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

from time import sleep
from glusto.core import Glusto as g
from glustolibs.gluster.gluster_base_class import (GlusterBaseClass, runs_on)
from glustolibs.gluster.exceptions import ExecutionError
from glustolibs.gluster.volume_ops import set_volume_options
from glustolibs.gluster.volume_libs import (
    verify_all_process_of_volume_are_online,
    wait_for_volume_process_to_be_online)
from glustolibs.gluster.volume_libs import expand_volume
from glustolibs.gluster.brick_libs import (select_bricks_to_bring_offline,
                                           bring_bricks_offline,
                                           bring_bricks_online,
                                           are_bricks_offline,
                                           get_all_bricks)
from glustolibs.gluster.heal_libs import (monitor_heal_completion,
                                          is_heal_complete,
                                          is_volume_in_split_brain,
                                          is_shd_daemonized)
from glustolibs.gluster.rebalance_ops import (rebalance_start,
                                              wait_for_rebalance_to_complete)
from glustolibs.gluster.heal_ops import trigger_heal
from glustolibs.misc.misc_libs import upload_scripts
from glustolibs.io.utils import (collect_mounts_arequal, validate_io_procs)


@runs_on([['arbiter', 'distributed-arbiter'], ['glusterfs', 'nfs']])
class TestSelfHeal(GlusterBaseClass):
    """
    Description:
        Arbiter Test cases related to
        healing in default configuration of the volume
    """

    @classmethod
    def setUpClass(cls):
        # Calling GlusterBaseClass setUpClass
        cls.get_super_method(cls, 'setUpClass')()

        # Upload io scripts for running IO on mounts
        g.log.info("Upload io scripts to clients %s for running IO on mounts",
                   cls.clients)
        cls.script_upload_path = ("/usr/share/glustolibs/io/scripts/"
                                  "file_dir_ops.py")
        ret = upload_scripts(cls.clients, cls.script_upload_path)
        if not ret:
            raise ExecutionError("Failed to upload IO scripts to clients %s"
                                 % cls.clients)
        g.log.info("Successfully uploaded IO scripts to clients %s",
                   cls.clients)

    def setUp(self):
        # Calling GlusterBaseClass
        self.get_super_method(self, 'setUp')()

        # Setup Volume and Mount Volume
        g.log.info("Starting to Setup Volume and Mount Volume")
        ret = self.setup_volume_and_mount_volume(mounts=self.mounts)
        if not ret:
            raise ExecutionError("Failed to Setup_Volume and Mount_Volume")
        g.log.info("Successful in Setup Volume and Mount Volume")

    def tearDown(self):
        """
        Cleanup and umount volume
        """

        # Cleanup and umount volume
        g.log.info("Starting to Unmount Volume and Cleanup Volume")
        ret = self.unmount_volume_and_cleanup_volume(mounts=self.mounts)
        if not ret:
            raise ExecutionError("Failed to umount the vol & cleanup Volume")
        g.log.info("Successful in umounting the volume and Cleanup")

        # Calling GlusterBaseClass teardown
        self.get_super_method(self, 'tearDown')()

    def test_data_self_heal_daemon_off(self):
        """
        Test Data-Self-Heal (heal command)

        Description:
        - set the volume option
        "metadata-self-heal": "off"
        "entry-self-heal": "off"
        "data-self-heal": "off"
        - create IO
        - Get arequal before getting bricks offline
        - set the volume option
        "self-heal-daemon": "off"
        - bring down all bricks processes from selected set
        - Get areeual after getting bricks offline and compare with
        arequal before getting bricks offline
        - modify the data
        - bring bricks online
        - set the volume option
        "self-heal-daemon": "on"
        - check daemons and start healing
        - check if heal is completed
        - check for split-brain
        - add bricks
        - do rebalance
        - create 1k files
        - while creating files - kill bricks and bring bricks online one by one
        in cycle
        - validate IO
        """
        # pylint: disable=too-many-statements,too-many-locals

        # Setting options
        g.log.info('Setting options...')
        options = {"metadata-self-heal": "off",
                   "entry-self-heal": "off",
                   "data-self-heal": "off"}
        ret = set_volume_options(self.mnode, self.volname, options)
        self.assertTrue(ret, 'Failed to set options %s' % options)
        g.log.info("Successfully set %s for volume %s",
                   options, self.volname)

        # Creating files on client side
        g.log.info("Starting IO on %s:%s", self.mounts[0].client_system,
                   self.mounts[0].mountpoint)
        cmd = ("/usr/bin/env python %s create_files -f 100"
               " --fixed-file-size 1k %s"
               % (self.script_upload_path,
                  self.mounts[0].mountpoint))
        ret, _, err = g.run(self.mounts[0].client_system, cmd,
                            user=self.mounts[0].user)
        self.assertFalse(ret, 'Failed to create the data for %s: %s'
                         % (self.mounts[0].mountpoint, err))
        g.log.info('Created IO for %s is successfully',
                   self.mounts[0].mountpoint)

        # Get arequal before getting bricks offline
        g.log.info('Getting arequal before getting bricks offline...')
        ret, arequals = collect_mounts_arequal(self.mounts)
        self.assertTrue(ret, 'Failed to get arequal')
        result_before_offline = arequals[0].splitlines()[-1].split(':')[-1]
        g.log.info('Getting arequal before getting bricks offline '
                   'is successful')

        # Setting options
        g.log.info('Setting options...')
        options = {"self-heal-daemon": "off"}
        ret = set_volume_options(self.mnode, self.volname, options)
        self.assertTrue(ret, 'Failed to set options %s' % options)
        g.log.info("Option 'self-heal-daemon' is set to 'off' successfully")

        # Select bricks to bring offline
        bricks_to_bring_offline_dict = (select_bricks_to_bring_offline(
            self.mnode, self.volname))
        bricks_to_bring_offline = bricks_to_bring_offline_dict['volume_bricks']

        # Bring brick offline
        g.log.info('Bringing bricks %s offline...', bricks_to_bring_offline)
        ret = bring_bricks_offline(self.volname, bricks_to_bring_offline)
        self.assertTrue(ret, 'Failed to bring bricks %s offline' %
                        bricks_to_bring_offline)

        ret = are_bricks_offline(self.mnode, self.volname,
                                 bricks_to_bring_offline)
        self.assertTrue(ret, 'Bricks %s are not offline'
                        % bricks_to_bring_offline)
        g.log.info('Bringing bricks %s offline is successful',
                   bricks_to_bring_offline)

        # Get arequal after getting bricks offline
        g.log.info('Getting arequal after getting bricks offline...')
        ret, arequals = collect_mounts_arequal(self.mounts)
        self.assertTrue(ret, 'Failed to get arequal')
        result_after_offline = arequals[0].splitlines()[-1].split(':')[-1]
        g.log.info('Getting arequal after getting bricks offline '
                   'is successful')

        # Checking arequals before bringing bricks offline
        # and after bringing bricks offline
        self.assertEqual(result_before_offline, result_after_offline,
                         'Checksums before and '
                         'after bringing bricks online are not equal')
        g.log.info('Checksums before and after bringing bricks online '
                   'are equal')

        # Modify the data
        g.log.info("Modifying data for %s:%s", self.mounts[0].client_system,
                   self.mounts[0].mountpoint)
        cmd = ("/usr/bin/env python %s create_files -f 100"
               " --fixed-file-size 10k %s"
               % (self.script_upload_path,
                  self.mounts[0].mountpoint))
        ret, _, err = g.run(self.mounts[0].client_system, cmd,
                            user=self.mounts[0].user)
        self.assertFalse(ret, 'Failed to midify the data for %s: %s'
                         % (self.mounts[0].mountpoint, err))
        g.log.info('Modified IO for %s is successfully',
                   self.mounts[0].mountpoint)

        # Bring brick online
        g.log.info('Bringing bricks %s online...', bricks_to_bring_offline)
        ret = bring_bricks_online(self.mnode, self.volname,
                                  bricks_to_bring_offline)
        self.assertTrue(ret, 'Failed to bring bricks %s online' %
                        bricks_to_bring_offline)
        g.log.info('Bringing bricks %s online is successful',
                   bricks_to_bring_offline)

        # Setting options
        g.log.info('Setting options...')
        options = {"self-heal-daemon": "on"}
        ret = set_volume_options(self.mnode, self.volname, options)
        self.assertTrue(ret, 'Failed to set options %s' % options)
        g.log.info("Option 'self-heal-daemon' is set to 'on' successfully")

        # Wait for volume processes to be online
        g.log.info("Wait for volume processes to be online")
        ret = wait_for_volume_process_to_be_online(self.mnode, self.volname)
        self.assertTrue(ret, ("Failed to wait for volume %s processes to "
                              "be online", self.volname))
        g.log.info("Successful in waiting for volume %s processes to be "
                   "online", self.volname)

        # Verify volume's all process are online
        g.log.info("Verifying volume's all process are online")
        ret = verify_all_process_of_volume_are_online(self.mnode, self.volname)
        self.assertTrue(ret, ("Volume %s : All process are not online"
                              % self.volname))
        g.log.info("Volume %s : All process are online", self.volname)

        # Wait for self-heal-daemons to be online
        g.log.info("Waiting for self-heal-daemons to be online")
        ret = is_shd_daemonized(self.all_servers)
        self.assertTrue(ret, "Either No self heal daemon process found")
        g.log.info("All self-heal-daemons are online")

        # Start healing
        ret = trigger_heal(self.mnode, self.volname)
        self.assertTrue(ret, 'Heal is not started')
        g.log.info('Healing is started')

        # Monitor heal completion
        ret = monitor_heal_completion(self.mnode, self.volname)
        self.assertTrue(ret, 'Heal has not yet completed')

        # Check if heal is completed
        ret = is_heal_complete(self.mnode, self.volname)
        self.assertTrue(ret, 'Heal is not complete')
        g.log.info('Heal is completed successfully')

        # Check for split-brain
        ret = is_volume_in_split_brain(self.mnode, self.volname)
        self.assertFalse(ret, 'Volume is in split-brain state')
        g.log.info('Volume is not in split-brain state')

        # Add bricks
        g.log.info("Start adding bricks to volume...")
        ret = expand_volume(self.mnode, self.volname, self.servers,
                            self.all_servers_info)
        self.assertTrue(ret, ("Failed to expand the volume %s", self.volname))
        g.log.info("Expanding volume is successful on "
                   "volume %s", self.volname)

        # Do rebalance
        ret, _, _ = rebalance_start(self.mnode, self.volname)
        self.assertEqual(ret, 0, 'Failed to start rebalance')
        g.log.info('Rebalance is started')

        ret = wait_for_rebalance_to_complete(self.mnode, self.volname)
        self.assertTrue(ret, 'Rebalance is not completed')
        g.log.info('Rebalance is completed successfully')

        # Create 1k files
        all_mounts_procs = []
        g.log.info("Modifying data for %s:%s", self.mounts[0].client_system,
                   self.mounts[0].mountpoint)
        command = ("/usr/bin/env python %s create_files -f 1000"
                   " --base-file-name newfile %s"
                   % (self.script_upload_path, self.mounts[0].mountpoint))

        proc = g.run_async(self.mounts[0].client_system, command,
                           user=self.mounts[0].user)
        all_mounts_procs.append(proc)

        # Kill all bricks in cycle
        bricks_list = get_all_bricks(self.mnode, self.volname)
        for brick in bricks_list:
            # Bring brick offline
            g.log.info('Bringing bricks %s offline', brick)
            ret = bring_bricks_offline(self.volname, [brick])
            self.assertTrue(ret, 'Failed to bring bricks %s offline' % brick)

            ret = are_bricks_offline(self.mnode, self.volname, [brick])
            self.assertTrue(ret, 'Bricks %s are not offline' % brick)
            g.log.info('Bringing bricks %s offline is successful', brick)

            # Introducing 30 second sleep when brick is down
            g.log.info("Waiting for 30 seconds, with ongoing IO while "
                       "brick %s is offline", brick)
            sleep(30)

            # Bring brick online
            g.log.info('Bringing bricks %s online...', brick)
            ret = bring_bricks_online(self.mnode, self.volname,
                                      [brick])
            self.assertTrue(ret, 'Failed to bring bricks %s online' %
                            bricks_to_bring_offline)
            g.log.info('Bringing bricks %s online is successful',
                       brick)

            # Wait for volume processes to be online
            g.log.info("Wait for volume processes to be online")
            ret = wait_for_volume_process_to_be_online(self.mnode,
                                                       self.volname)
            self.assertTrue(ret, ("Failed to wait for volume %s processes to "
                                  "be online", self.volname))
            g.log.info("Successful in waiting for volume %s processes to be "
                       "online", self.volname)

            # Verify volume's all process are online
            g.log.info("Verifying volume's all process are online")
            ret = verify_all_process_of_volume_are_online(self.mnode,
                                                          self.volname)
            self.assertTrue(ret, ("Volume %s : All process are not online"
                                  % self.volname))
            g.log.info("Volume %s : All process are online", self.volname)

            # Wait for self-heal-daemons to be online
            g.log.info("Waiting for self-heal-daemons to be online")
            ret = is_shd_daemonized(self.all_servers)
            self.assertTrue(ret, "Either No self heal daemon process found or"
                                 "more than one self heal daemon process"
                                 "found")
            g.log.info("All self-heal-daemons are online")

        # Validate IO
        self.assertTrue(
            validate_io_procs(all_mounts_procs, self.mounts),
            "IO failed on some of the clients")