# Copyright (C) 2011 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


from breezy import (
    workingtree,
    )
from breezy.tests import TestCaseWithTransport


class TestRepairWorkingTree(TestCaseWithTransport):

    def break_dirstate(self, tree, completely=False):
        """Write garbage into the dirstate file."""
        # This test assumes that the format uses a DirState file, which we then
        # manually corrupt. If we change the way to get at that dirstate file,
        # then we can update how this is done
        self.assertIsNot(None, getattr(tree, 'current_dirstate', None))
        with tree.lock_read():
            dirstate = tree.current_dirstate()
            dirstate_path = dirstate._filename
            self.assertPathExists(dirstate_path)
        # We have to have the tree unlocked at this point, so we can safely
        # mutate the state file on all platforms.
        if completely:
            f = open(dirstate_path, 'wb')
        else:
            f = open(dirstate_path, 'ab')
        try:
            f.write('garbage-at-end-of-file\n')
        finally:
            f.close()

    def make_initial_tree(self):
        tree = self.make_branch_and_tree('tree')
        self.build_tree(['tree/foo', 'tree/dir/', 'tree/dir/bar'])
        tree.add(['foo', 'dir', 'dir/bar'])
        tree.commit('first')
        return tree

    def test_repair_refuses_uncorrupted(self):
        tree = self.make_initial_tree()
        # If the tree doesn't appear to be corrupt, we refuse, but prompt the
        # user to let them know that:
        # a) they may want to use 'brz revert' instead of repair-workingtree
        # b) they can use --force if they really want to do this
        self.run_bzr_error(['The tree does not appear to be corrupt',
                            '"brz revert"',
                            '--force'],
                           'repair-workingtree -d tree')

    def test_repair_forced(self):
        tree = self.make_initial_tree()
        tree.rename_one('dir', 'alt_dir')
        self.assertIsNot(None, tree.path2id('alt_dir'))
        self.run_bzr('repair-workingtree -d tree --force')
        # This requires the tree has reloaded the working state
        self.assertIs(None, tree.path2id('alt_dir'))
        self.assertPathExists('tree/alt_dir')

    def test_repair_corrupted_dirstate(self):
        tree = self.make_initial_tree()
        self.break_dirstate(tree)
        self.run_bzr('repair-workingtree -d tree')
        tree = workingtree.WorkingTree.open('tree')
        # At this point, check should be happy
        tree.check_state()

    def test_repair_naive_destroyed_fails(self):
        tree = self.make_initial_tree()
        self.break_dirstate(tree, completely=True)
        self.run_bzr_error(['the header appears corrupt, try passing'],
                           'repair-workingtree -d tree')

    def test_repair_destroyed_with_revs_passes(self):
        tree = self.make_initial_tree()
        self.break_dirstate(tree, completely=True)
        self.run_bzr('repair-workingtree -d tree -r -1')
        tree = workingtree.WorkingTree.open('tree')
        # At this point, check should be happy
        tree.check_state()
