# -*- coding: utf-8 -*-
#
# Copyright 2020 - Swiss Data Science Center (SDSC)
# A partnership between École Polytechnique Fédérale de Lausanne (EPFL) and
# Eidgenössische Technische Hochschule Zürich (ETHZ).
#
# 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.
"""Custom git merge tool for renku metadata.

Support merging Renku metadata
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Renku stores all of its metadata in the repository, in compressed form.
When working in multiple branches with Renku, this metadata needs to be merged when a git merge is made.
To support users when doing this, Renku provides a custom merge tool that takes care of merging the metadata.

The merge tool is set up automatically when creating a new project or when using ``renku clone`` to clone a Renku
project.

You can manually set up the merge tool by running ``renku mergetool install``.
"""

import click

from renku.ui.cli.utils.callback import ClickCallback


@click.group()
def mergetool():
    """Mergetool commands."""
    pass


@mergetool.command(hidden=True)
@click.argument("base", type=click.Path(exists=True))
@click.argument("local", type=click.Path(exists=True))
@click.argument("remote", type=click.Path(exists=True))
def merge(base, local, remote):
    """Move files and check repository for potential problems."""
    from renku.command.mergetool import mergetool_command

    communicator = ClickCallback()
    mergetool_command().with_communicator(communicator).build().execute(local=local, remote=remote, base=base)


@mergetool.command()
def install():
    """Setup mergetool locally."""
    from renku.command.mergetool import mergetool_install_command

    mergetool_install_command().with_commit().build().execute()
