# -*- coding: utf-8 -*- #
# Copyright 2022 Google LLC. All Rights Reserved.
#
# 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.
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"""Implementation of Unix-like mv command for cloud storage providers."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.storage import cp_command_util
from googlecloudsdk.command_lib.storage import errors
from googlecloudsdk.command_lib.storage import flags
from googlecloudsdk.command_lib.storage import storage_url


@base.UniverseCompatible
class Mv(base.Command):
  """Moves or renames objects."""

  detailed_help = {
      "DESCRIPTION": """
      The mv command allows you to move data between your local file system and
      the cloud, move data within the cloud, and move data between cloud storage
      providers.

      *Renaming Groups Of Objects*

      You can use the mv command to rename all objects with a given prefix to
      have a new prefix. For example, the following command renames all objects
      under gs://my_bucket/oldprefix to be under gs://my_bucket/newprefix,
      otherwise preserving the naming structure:

        $ {command} gs://my_bucket/oldprefix gs://my_bucket/newprefix

      Note that when using mv to rename groups of objects with a common prefix,
      you cannot specify the source URL using wildcards; you must spell out the
      complete name.

      If you do a rename as specified above and you want to preserve ACLs.

      *Non-Atomic Operation*

      Unlike the case with many file systems, the mv command does not perform a
      single atomic operation. Rather, it performs a copy from source to
      destination followed by removing the source for each object.

      A consequence of this is that, in addition to normal network and operation
      charges, if you move a Nearline Storage, Coldline Storage, or Archive
      Storage object, deletion and data retrieval charges apply.
      See the documentation for pricing details.
      """,
      "EXAMPLES": """

      To move all objects from a bucket to a local directory you could use:

        $ {command} gs://my_bucket/* dir

      Similarly, to move all objects from a local directory to a bucket you
      could use:

        $ {command} ./dir gs://my_bucket

      The following command renames all objects under gs://my_bucket/oldprefix
      to be under gs://my_bucket/newprefix, otherwise preserving the naming
      structure:

        $ {command} gs://my_bucket/oldprefix gs://my_bucket/newprefix
      """,
  }

  @classmethod
  def Args(cls, parser):
    cp_command_util.add_cp_and_mv_flags(parser, cls.ReleaseTrack())
    flags.add_per_object_retention_flags(parser)

  def Run(self, args):

    for url_string in args.source:
      url = storage_url.storage_url_from_string(url_string)
      if isinstance(url, storage_url.CloudUrl) and not url.is_object():
        raise errors.InvalidUrlError("Cannot mv buckets.")
      if url.is_stdio:
        raise errors.InvalidUrlError("Cannot mv stdin.")
    # Must copy children of prefixes and folders.
    args.recursive = True
    self.exit_code = cp_command_util.run_cp(args, delete_source=True)
