# -*- coding: utf-8 -*- #
# Copyright 2020 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.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Implementation of Unix-like cp 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 flags

_COMMAND_DESCRIPTION = """
Copy data between your local file system and the cloud, within the cloud,
and between cloud storage providers.

Please Note - By default, the `cp` command does not follow directory symlinks.
You can use the `--preserve-symlinks` flag to follow directory symlinks.
"""
_GA_EXAMPLES = """
The following command uploads all text files from the local directory to a
bucket:

  $ {command} *.txt gs://my-bucket

The following command downloads all text files from a bucket to your
current directory:

  $ {command} gs://my-bucket/*.txt .

The following command transfers all text files from a bucket to a
different cloud storage provider:

  $ {command} gs://my-bucket/*.txt s3://my-bucket

Use the `--recursive` option to copy an entire directory tree. The
following command uploads the directory tree ``dir'':

  $ {command} --recursive dir gs://my-bucket

Recursive listings are similar to adding `**` to a query, except
`**` matches only cloud objects and will not match prefixes. For
example, the following would not match ``gs://my-bucket/dir/log.txt''

  $ {command} gs://my-bucket/**/dir dir

`**` retrieves a flat list of objects in a single API call. However, `**`
matches folders for non-cloud queries. For example, a folder ``dir''
would be copied in the following.

  $ {command} ~/Downloads/**/dir gs://my-bucket
"""
_ALPHA_EXAMPLES = """
The contexts are preserved when copying to Google Cloud Storage. To overwrite
contexts on the destination object, use `--custom-contexts` or
`--custom-contexts-file`. For example:

  $ {command} gs://my-bucket/object \
    gs://destination-bucket/object \
    --custom-contexts=key1=value1,key2=value2
"""


@base.UniverseCompatible
@base.ReleaseTracks(base.ReleaseTrack.GA)
class Cp(base.Command):
  """Upload, download, and copy Cloud Storage objects."""

  detailed_help = {
      'DESCRIPTION': _COMMAND_DESCRIPTION,
      'EXAMPLES': _GA_EXAMPLES,
  }

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

  def Run(self, args):

    self.exit_code = cp_command_util.run_cp(args)


@base.UniverseCompatible
@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class CpAlpha(Cp):
  """Upload, download, and copy Cloud Storage objects."""

  detailed_help = {
      'DESCRIPTION': _COMMAND_DESCRIPTION,
      'EXAMPLES': _GA_EXAMPLES + _ALPHA_EXAMPLES,
  }