# (c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
#
# 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.


"""
Freezer Backup modes related functions
"""

from freezer.snapshot import lvm
from freezer.snapshot import vss
from freezer.utils import winutils


def snapshot_create(backup_opt_dict):
    """
    Calls the code to take fs snapshots, depending on the platform

    :param backup_opt_dict:
    :return: boolean value, True if snapshot has been taken, false otherwise
    """
    if not backup_opt_dict.snapshot:
        return False

    if winutils.is_windows():
        if backup_opt_dict.snapshot:
            # Create a shadow copy.
            backup_opt_dict.shadow_path, backup_opt_dict.shadow = \
                vss.vss_create_shadow_copy(backup_opt_dict.windows_volume)

            backup_opt_dict.path_to_backup = winutils.use_shadow(
                backup_opt_dict.path_to_backup,
                backup_opt_dict.windows_volume)
            return True
        return False
    else:
        return lvm.lvm_snap(backup_opt_dict)


def snapshot_remove(backup_opt_dict, shadow, windows_volume):
    if winutils.is_windows():
        # Delete the shadow copy after the backup
        vss.vss_delete_shadow_copy(shadow, windows_volume)
    else:
        # Unmount and remove lvm snapshot volume
        lvm.lvm_snap_remove(backup_opt_dict)