# Copyright (C) 2010-2024 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import pytest

from rhodecode.lib.vcs.nodes import FileNode
from rhodecode.lib.vcs.exceptions import CommitDoesNotExistError
from rhodecode.model.pull_request import PullRequestModel


@pytest.mark.usefixtures("config_stub")
@pytest.mark.backends("git")
class TestGetDiffForPrOrVersion(object):
    def test_works_for_missing_git_references(self, pr_util):
        pull_request = self._prepare_pull_request(pr_util)
        removed_commit_id = pr_util.remove_one_commit()
        self.assert_commit_cannot_be_accessed(removed_commit_id, pull_request)

        self.assert_diff_can_be_fetched(pull_request)

    def test_works_for_missing_git_references_during_update(self, pr_util):
        pull_request = self._prepare_pull_request(pr_util)
        removed_commit_id = pr_util.remove_one_commit()
        self.assert_commit_cannot_be_accessed(removed_commit_id, pull_request)

        pr_version = PullRequestModel().get_versions(pull_request)[0]
        self.assert_diff_can_be_fetched(pr_version)

    def _prepare_pull_request(self, pr_util):
        commits = [
            {"message": "a"},
            {"message": "b", "added": [FileNode(b"file_b", "test_content\n")]},
            {"message": "c", "added": [FileNode(b"file_c", "test_content\n")]},
        ]
        pull_request = pr_util.create_pull_request(
            commits=commits, target_head="a", source_head="c", revisions=["b", "c"]
        )
        return pull_request

    def assert_diff_can_be_fetched(self, pr_or_version):
        source_repo = pr_or_version.source_repo
        source_ref_id = pr_or_version.source_ref_parts.commit_id
        target_ref_id = pr_or_version.target_ref_parts.commit_id
        diff = PullRequestModel()._get_diff_from_pr_or_version(
            source_repo, source_ref_id, target_ref_id, hide_whitespace_changes=False, diff_context=6
        )
        assert b"file_b" in diff.raw.tobytes()

    def assert_commit_cannot_be_accessed(self, removed_commit_id, pull_request):
        source_vcs = pull_request.source_repo.scm_instance()
        with pytest.raises(CommitDoesNotExistError):
            source_vcs.get_commit(commit_id=removed_commit_id)