# Copyright (C) 2008 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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 General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for the get_parent_map API."""

from breezy import revision
from breezy.tests.per_repository import TestCaseWithRepository


class TestGetParentMap(TestCaseWithRepository):
    def test_missing_revision(self):
        tree = self.make_branch_and_tree(".")
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({}, repo.get_parent_map([b"non-existant"]))

    def test_multiple_parents(self):
        tree = self.make_branch_and_tree(".")
        rev1 = tree.commit("first")
        rev2 = tree.commit("second")
        tree.set_parent_ids([rev1, rev2])
        tree.branch.set_last_revision_info(1, rev1)
        rev3 = tree.commit("third")
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({rev3: (rev1, rev2)}, repo.get_parent_map([rev3]))
        self.assertEqual(
            {
                rev1: (revision.NULL_REVISION,),
                rev2: (rev1,),
                rev3: (rev1, rev2),
            },
            repo.get_parent_map([rev1, rev2, rev3]),
        )

    def test_no_parents(self):
        tree = self.make_branch_and_tree(".")
        rev1 = tree.commit("first")
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({rev1: (revision.NULL_REVISION,)}, repo.get_parent_map([rev1]))

    def test_none(self):
        tree = self.make_branch_and_tree(".")
        tree.commit("first")
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertRaises(ValueError, repo.get_parent_map, [None])

    def test_null_revision(self):
        tree = self.make_branch_and_tree(".")
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual(
            {revision.NULL_REVISION: ()}, repo.get_parent_map([revision.NULL_REVISION])
        )
