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#  Copyright (C) 2017-2020  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 glusto.core import Glusto as g

from glustolibs.gluster.gluster_base_class import (GlusterBaseClass,
                                                   runs_on)
from glustolibs.gluster.exceptions import ExecutionError
from glustolibs.misc.misc_libs import upload_scripts
from glustolibs.io.utils import validate_io_procs
from glustolibs.gluster.rebalance_ops import (
    rebalance_start, wait_for_rebalance_to_complete)
from glustolibs.gluster.volume_libs import (
    log_volume_info_and_status, expand_volume,
    wait_for_volume_process_to_be_online)


@runs_on([['dispersed', 'distributed-dispersed'],
          ['glusterfs', 'nfs']])
class DispersedWithAddBrick(GlusterBaseClass):
    """
    Test case validates add-brick and rebalance in a dispersed
    volume
    """
    @classmethod
    def setUpClass(cls):
        """
        Setup volume and mount volume
        Calling GlusterBaseClass setUpClass
        """
        cls.get_super_method(cls, 'setUpClass')()

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

        # 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 test_disperse_addbrick(self):

        # pylint: disable=too-many-branches,too-many-statements,too-many-locals
        """
        - Write IO's
        - Start add brick
        - Validate IOs
        - Start rebalance
        - Wait for rebalance to complete
        - Start IO's and Vaildate IO's
        """

        # Write IO
        all_mounts_procs = []
        count = 1
        for mount_obj in self.mounts:
            g.log.info("Starting IO on %s:%s", mount_obj.client_system,
                       mount_obj.mountpoint)
            cmd = ("/usr/bin/env python %s create_deep_dirs_with_files "
                   "--dirname-start-num %d "
                   "--dir-depth 2 "
                   "--dir-length 10 "
                   "--max-num-of-dirs 5 "
                   "--num-of-files 5 %s" % (
                       self.script_upload_path, count,
                       mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)
            count = count + 10

        # Start add-brick (subvolume-increase)
        g.log.info("Start adding bricks to volume when IO in progress")
        ret = expand_volume(self.mnode, self.volname, self.servers,
                            self.all_servers_info)
        self.assertTrue(ret, ("Failed to expand the volume when IO in "
                              "progress on volume %s", self.volname))
        g.log.info("Expanding volume when IO in progress is successful on "
                   "volume %s", self.volname)

        # Log Volume Info and Status after expanding the volume
        g.log.info("Logging volume info and Status after expanding volume")
        ret = log_volume_info_and_status(self.mnode, self.volname)
        self.assertTrue(ret, ("Logging volume info and status failed on "
                              "volume %s", self.volname))
        g.log.info("Successful in logging volume info and status of volume %s",
                   self.volname)

        # 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, ("All process  for volume %s are not"
                              "online", self.volname))
        g.log.info("All volume %s processes are now online",
                   self.volname)

        # Validating IO's and waiting to complete
        g.log.info("Validating IO's")
        ret = validate_io_procs(all_mounts_procs, self.mounts)
        self.assertTrue(ret, "IO failed on some of the clients")
        g.log.info("Successfully validated all io's")

        # Start Rebalance
        g.log.info("Starting Rebalance on the volume")
        ret, _, _ = rebalance_start(self.mnode, self.volname)
        self.assertEqual(ret, 0, ("Failed to start rebalance on the volume "
                                  "%s", self.volname))
        g.log.info("Successfully started rebalance on the volume %s",
                   self.volname)

        # Wait for rebalance to complete
        g.log.info("Waiting for rebalance to complete")
        ret = wait_for_rebalance_to_complete(self.mnode, self.volname,
                                             timeout=600)
        self.assertTrue(ret, "Rebalance did not complete "
                             "despite waiting for 10 mins")
        g.log.info("Rebalance is successfully complete on the volume %s",
                   self.volname)

        # Start IO on all mounts after rebalance completes
        all_mounts_procs = []
        count = 21
        for mount_obj in self.mounts:
            g.log.info("Starting IO on %s:%s", mount_obj.client_system,
                       mount_obj.mountpoint)
            cmd = ("/usr/bin/env python %s create_deep_dirs_with_files "
                   "--dirname-start-num %d "
                   "--dir-depth 2 "
                   "--dir-length 10 "
                   "--max-num-of-dirs 5 "
                   "--num-of-files 5 %s" % (
                       self.script_upload_path, count,
                       mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)
            count = count + 10

        # Validate IO
        g.log.info("Validating IO's")
        ret = validate_io_procs(all_mounts_procs, self.mounts)
        self.assertTrue(ret, "IO failed on some of the clients")
        g.log.info("Successfully validated all io's")

    def tearDown(self):
        """
        Clean up the volume and umount volume from client
        """

        # Unmount volume from client
        # Test needs to continue if  unmount fail.Not asserting here.
        ret = self.unmount_volume(self.mounts)
        if ret:
            g.log.info("Successfully unmounted all the volumes")
        else:
            g.log.error(ret, "Failed to unmount volumes")

        # cleanup-volume
        ret = self.cleanup_volume()
        if not ret:
            raise ExecutionError("Failed to Cleanup Volume")
        g.log.info("Cleanup volume %s Completed Successfully", self.volname)