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#  Copyright (C) 2015-2018  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.

import sys

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_libs import (
    verify_all_process_of_volume_are_online,
    wait_for_volume_process_to_be_online,
    get_subvols)
from glustolibs.gluster.brick_libs import get_all_bricks
from glustolibs.gluster.brick_ops import replace_brick
from glustolibs.gluster.heal_libs import (monitor_heal_completion,
                                          is_heal_complete,
                                          is_volume_in_split_brain,
                                          is_shd_daemonized)
from glustolibs.misc.misc_libs import upload_scripts
from glustolibs.io.utils import (validate_io_procs,
                                 list_all_files_and_dirs_mounts,
                                 wait_for_io_to_complete)


@runs_on([['distributed-replicated'],
          ['glusterfs']])
class TestArbiterSelfHeal(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 setUp
        self.get_super_method(self, 'setUp')()

        # Setup Volumes
        if self.volume_type == "distributed-replicated":
            self.volume_configs = []

            # Redefine distributed-replicated volume
            self.volume['voltype'] = {
                'type': 'distributed-replicated',
                'replica_count': 3,
                'dist_count': 4,
                'arbiter_count': 1,
                'transport': 'tcp'}

        self.all_mounts_procs = []
        self.io_validation_complete = False
        self.bricks_to_clean = []

        # 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):
        """
        If test method failed before validating IO, tearDown waits for the
        IO's to complete and checks for the IO exit status

        Cleanup and umount volume
        """
        if not self.io_validation_complete:
            g.log.info("Wait for IO to complete as IO validation did not "
                       "succeed in test method")
            ret = wait_for_io_to_complete(self.all_mounts_procs, self.mounts)
            if not ret:
                raise ExecutionError("IO failed on some of the clients")
            g.log.info("IO is successful on all mounts")

            # List all files and dirs created
            g.log.info("List all files and directories:")
            ret = list_all_files_and_dirs_mounts(self.mounts)
            if not ret:
                raise ExecutionError("Failed to list all files and dirs")
            g.log.info("Listing all files and directories is successful")

        # Clear arbiter brick folders before replacing bricks.
        if self.bricks_to_clean:
            for brick in self.bricks_to_clean:
                g.log.info('Clearing brick %s', brick)
                node, brick_path = brick.split(':')
                ret, _, err = g.run(node, 'rm -rf %s' % brick_path)
                self.assertFalse(ret, err)
                g.log.info('Clearing brick %s is successful', brick)
            g.log.info('Clearing for all brick is successful')

        # 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_replacing_all_arbiters(self):
        """
        - Create an arbiter volume 4(2+1) distributed replicate
        - Start writing IO
        - While the I/O's are going on replace all the arbiter bricks
        - check for the new bricks attached successfully
        - Check for heals
        - Validate IO
        """
        # pylint: disable=too-many-locals,too-many-statements
        # get the bricks for the volume
        g.log.info("Fetching bricks for the volume: %s", self.volname)
        bricks_list = get_all_bricks(self.mnode, self.volname)
        g.log.info("Brick list: %s", bricks_list)

        # Clear all brick folders. Its need to prevent healing with old files
        for brick in bricks_list:
            g.log.info('Clearing brick %s', brick)
            node, brick_path = brick.split(':')
            ret, _, err = g.run(node, 'cd %s/ ; rm -rf *' % brick_path)
            self.assertFalse(ret, err)
            g.log.info('Clearing brick %s is successful', brick)
        g.log.info('Clearing for all brick is successful')

        # Creating files on client side
        for mount_obj in self.mounts:
            g.log.info("Generating data for %s:%s",
                       mount_obj.client_system, mount_obj.mountpoint)
            # Create dirs with file
            g.log.info('Creating dirs with file...')
            command = ("/usr/bin/env python%d %s create_deep_dirs_with_files "
                       "-d 3 "
                       "-l 3 "
                       "-n 3 "
                       "-f 20 "
                       "%s" % (
                           sys.version_info.major, self.script_upload_path,
                           mount_obj.mountpoint))

            proc = g.run_async(mount_obj.client_system, command,
                               user=mount_obj.user)
            self.all_mounts_procs.append(proc)
        self.io_validation_complete = False

        # replace bricks
        subvols = get_subvols(self.mnode, self.volname)['volume_subvols']
        for subvol in subvols:
            g.log.info('Replacing arbiter brick for %s', subvol)
            brick_to_replace = subvol[-1]
            self.bricks_to_clean.append(brick_to_replace)
            new_brick = brick_to_replace + 'new'
            g.log.info("Replacing the brick %s for the volume: %s",
                       brick_to_replace, self.volname)
            ret, _, err = replace_brick(self.mnode, self.volname,
                                        brick_to_replace, new_brick)
            self.assertFalse(ret, err)
            g.log.info('Replaced brick %s to %s successfully',
                       brick_to_replace, new_brick)

        # check replaced bricks
        subvols = get_subvols(self.mnode, self.volname)['volume_subvols']
        index = 0
        for subvol in subvols:
            expected_brick_path = self.bricks_to_clean[index]+'new'
            brick_to_check = subvol[-1]
            self.assertEqual(expected_brick_path, brick_to_check,
                             'Brick %s is not replaced brick'
                             % brick_to_check)
            index += 1

        # 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")

        # 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')

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