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#
#  Copyright (C) 2018 Codethink Limited
#  Copyright (C) 2019 Bloomberg Finance LP
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 2 of the License, or (at your option) any later version.
#
#  This library 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
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
#

# Pylint doesn't play well with fixtures and dependency injection from pytest
# pylint: disable=redefined-outer-name

import os
import shutil
import pytest

from tests.testutils import create_repo, ALL_REPO_KINDS

from buildstream.plugintestutils import cli  # pylint: disable=unused-import
from buildstream import _yaml

# Project directory
TOP_DIR = os.path.dirname(os.path.realpath(__file__))
DATA_DIR = os.path.join(TOP_DIR, 'project')


class WorkspaceCreator():
    def __init__(self, cli, tmpdir, datafiles, project_path=None):
        self.cli = cli
        self.tmpdir = tmpdir
        self.datafiles = datafiles

        if not project_path:
            project_path = str(datafiles)
        else:
            shutil.copytree(str(datafiles), project_path)

        self.project_path = project_path
        self.bin_files_path = os.path.join(project_path, 'files', 'bin-files')

        self.workspace_cmd = os.path.join(self.project_path, 'workspace_cmd')

    def create_workspace_element(self, kind, track, suffix='', workspace_dir=None,
                                 element_attrs=None):
        element_name = 'workspace-test-{}{}.bst'.format(kind, suffix)
        element_path = os.path.join(self.project_path, 'elements')
        if not workspace_dir:
            workspace_dir = os.path.join(self.workspace_cmd, element_name)
            if workspace_dir[-4:] == '.bst':
                workspace_dir = workspace_dir[:-4]

        # Create our repo object of the given source type with
        # the bin files, and then collect the initial ref.
        repo = create_repo(kind, str(self.tmpdir))
        ref = repo.create(self.bin_files_path)
        if track:
            ref = None

        # Write out our test target
        element = {
            'kind': 'import',
            'sources': [
                repo.source_config(ref=ref)
            ]
        }
        if element_attrs:
            element = {**element, **element_attrs}
        _yaml.dump(element,
                   os.path.join(element_path,
                                element_name))
        return element_name, element_path, workspace_dir

    def create_workspace_elements(self, kinds, track, suffixs=None, workspace_dir_usr=None,
                                  element_attrs=None):

        element_tuples = []

        if suffixs is None:
            suffixs = ['', ] * len(kinds)
        else:
            if len(suffixs) != len(kinds):
                raise "terable error"

        for suffix, kind in zip(suffixs, kinds):
            element_name, _, workspace_dir = \
                self.create_workspace_element(kind, track, suffix, workspace_dir_usr,
                                              element_attrs)
            element_tuples.append((element_name, workspace_dir))

        # Assert that there is no reference, a track & fetch is needed
        states = self.cli.get_element_states(self.project_path, [
            e for e, _ in element_tuples
        ])
        if track:
            assert not any(states[e] != 'no reference' for e, _ in element_tuples)
        else:
            assert not any(states[e] != 'fetch needed' for e, _ in element_tuples)

        return element_tuples

    def open_workspaces(self, kinds, track, suffixs=None, workspace_dir=None,
                        element_attrs=None, no_checkout=False):

        element_tuples = self.create_workspace_elements(kinds, track, suffixs, workspace_dir,
                                                        element_attrs)
        os.makedirs(self.workspace_cmd, exist_ok=True)

        # Now open the workspace, this should have the effect of automatically
        # tracking & fetching the source from the repo.
        args = ['workspace', 'open']
        if track:
            args.append('--track')
        if no_checkout:
            args.append('--no-checkout')
        if workspace_dir is not None:
            assert len(element_tuples) == 1, "test logic error"
            _, workspace_dir = element_tuples[0]
            args.extend(['--directory', workspace_dir])

        args.extend([element_name for element_name, workspace_dir_suffix in element_tuples])
        result = self.cli.run(cwd=self.workspace_cmd, project=self.project_path, args=args)

        result.assert_success()

        if not no_checkout:
            # Assert that we are now buildable because the source is now cached.
            states = self.cli.get_element_states(self.project_path, [
                e for e, _ in element_tuples
            ])
            assert not any(states[e] != 'buildable' for e, _ in element_tuples)

            # Check that the executable hello file is found in each workspace
            for _, workspace in element_tuples:
                filename = os.path.join(workspace, 'usr', 'bin', 'hello')
                assert os.path.exists(filename)

        return element_tuples


def open_workspace(cli, tmpdir, datafiles, kind, track, suffix='', workspace_dir=None,
                   project_path=None, element_attrs=None, no_checkout=False):
    workspace_object = WorkspaceCreator(cli, tmpdir, datafiles, project_path)
    workspaces = workspace_object.open_workspaces((kind, ), track, (suffix, ), workspace_dir,
                                                  element_attrs, no_checkout)
    assert len(workspaces) == 1
    element_name, workspace = workspaces[0]
    return element_name, workspace_object.project_path, workspace


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("kind", ALL_REPO_KINDS)
def test_open(cli, tmpdir, datafiles, kind):
    open_workspace(cli, tmpdir, datafiles, kind, False)