# 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

import os

from bzrlib import (
    errors,
    osutils,
    pack,
    shelf,
    tests,
    transform,
    workingtree,
    )


EMPTY_SHELF = ("Bazaar pack format 1 (introduced in 0.18)\n"
               "B23\n"
               "metadata\n\n"
               "d11:revision_id5:null:e"
               "B159\n"
               "attribs\n\n"
               "d10:_id_numberi0e18:_new_executabilityde7:_new_idde"
               "9:_new_namede11:_new_parentde16:_non_present_idsde"
               "17:_removed_contentsle11:_removed_idle14:_tree_path_idsdeeE")


class TestPrepareShelf(tests.TestCaseWithTransport):

    def prepare_shelve_rename(self):
        tree = self.make_branch_and_tree('.')
        self.build_tree(['foo'])
        tree.add(['foo'], ['foo-id'])
        tree.commit('foo')
        tree.rename_one('foo', 'bar')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('rename', 'foo-id', 'foo', 'bar')],
                          list(creator.iter_shelvable()))
        return creator

    def check_shelve_rename(self, creator):
        work_trans_id = creator.work_transform.trans_id_file_id('foo-id')
        self.assertEqual('foo', creator.work_transform.final_name(
                         work_trans_id))
        shelf_trans_id = creator.shelf_transform.trans_id_file_id('foo-id')
        self.assertEqual('bar', creator.shelf_transform.final_name(
                         shelf_trans_id))

    def test_shelve_rename(self):
        creator = self.prepare_shelve_rename()
        creator.shelve_rename('foo-id')
        self.check_shelve_rename(creator)

    def test_shelve_change_handles_rename(self):
        creator = self.prepare_shelve_rename()
        creator.shelve_change(('rename', 'foo-id', 'foo', 'bar'))
        self.check_shelve_rename(creator)

    def prepare_shelve_move(self):
        tree = self.make_branch_and_tree('.')
        self.build_tree(['foo/', 'bar/', 'foo/baz'])
        tree.add(['foo', 'bar', 'foo/baz'], ['foo-id', 'bar-id', 'baz-id'])
        tree.commit('foo')
        tree.rename_one('foo/baz', 'bar/baz')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('rename', 'baz-id', 'foo/baz', 'bar/baz')],
                         list(creator.iter_shelvable()))
        return creator, tree

    def check_shelve_move(self, creator, tree):
        work_trans_id = creator.work_transform.trans_id_file_id('baz-id')
        work_foo = creator.work_transform.trans_id_file_id('foo-id')
        self.assertEqual(work_foo, creator.work_transform.final_parent(
                         work_trans_id))
        shelf_trans_id = creator.shelf_transform.trans_id_file_id('baz-id')
        shelf_bar = creator.shelf_transform.trans_id_file_id('bar-id')
        self.assertEqual(shelf_bar, creator.shelf_transform.final_parent(
                         shelf_trans_id))
        creator.transform()
        self.assertEqual('foo/baz', tree.id2path('baz-id'))

    def test_shelve_move(self):
        creator, tree = self.prepare_shelve_move()
        creator.shelve_rename('baz-id')
        self.check_shelve_move(creator, tree)

    def test_shelve_change_handles_move(self):
        creator, tree = self.prepare_shelve_move()
        creator.shelve_change(('rename', 'baz-id', 'foo/baz', 'bar/baz'))
        self.check_shelve_move(creator, tree)

    def assertShelvedFileEqual(self, expected_content, creator, file_id):
        s_trans_id = creator.shelf_transform.trans_id_file_id(file_id)
        shelf_file = creator.shelf_transform._limbo_name(s_trans_id)
        self.assertFileEqual(expected_content, shelf_file)

    def prepare_content_change(self):
        tree = self.make_branch_and_tree('.')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        self.build_tree_contents([('foo', 'a\n')])
        tree.add('foo', 'foo-id')
        tree.commit('Committed foo')
        self.build_tree_contents([('foo', 'b\na\nc\n')])
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        return creator

    def test_shelve_content_change(self):
        creator = self.prepare_content_change()
        self.assertEqual([('modify text', 'foo-id')],
                         list(creator.iter_shelvable()))
        creator.shelve_lines('foo-id', ['a\n', 'c\n'])
        creator.transform()
        self.assertFileEqual('a\nc\n', 'foo')
        self.assertShelvedFileEqual('b\na\n', creator, 'foo-id')

    def test_shelve_change_handles_modify_text(self):
        creator = self.prepare_content_change()
        creator.shelve_change(('modify text', 'foo-id'))
        creator.transform()
        self.assertFileEqual('a\n', 'foo')
        self.assertShelvedFileEqual('b\na\nc\n', creator, 'foo-id')

    def test_shelve_all(self):
        creator = self.prepare_content_change()
        creator.shelve_all()
        creator.transform()
        self.assertFileEqual('a\n', 'foo')
        self.assertShelvedFileEqual('b\na\nc\n', creator, 'foo-id')

    def prepare_shelve_creation(self):
        tree = self.make_branch_and_tree('.')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        tree.commit('Empty tree')
        self.build_tree_contents([('foo', 'a\n'), ('bar/',)])
        tree.add(['foo', 'bar'], ['foo-id', 'bar-id'])
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('add file', 'bar-id', 'directory', 'bar'),
                          ('add file', 'foo-id', 'file', 'foo')],
                          sorted(list(creator.iter_shelvable())))
        return creator, tree

    def check_shelve_creation(self, creator, tree):
        self.assertRaises(StopIteration,
                          tree.iter_entries_by_dir(['foo-id']).next)
        s_trans_id = creator.shelf_transform.trans_id_file_id('foo-id')
        self.assertEqual('foo-id',
                         creator.shelf_transform.final_file_id(s_trans_id))
        self.failIfExists('foo')
        self.failIfExists('bar')
        self.assertShelvedFileEqual('a\n', creator, 'foo-id')
        s_bar_trans_id = creator.shelf_transform.trans_id_file_id('bar-id')
        self.assertEqual('directory',
            creator.shelf_transform.final_kind(s_bar_trans_id))

    def test_shelve_creation(self):
        creator, tree = self.prepare_shelve_creation()
        creator.shelve_creation('foo-id')
        creator.shelve_creation('bar-id')
        creator.transform()
        self.check_shelve_creation(creator, tree)

    def test_shelve_change_handles_creation(self):
        creator, tree = self.prepare_shelve_creation()
        creator.shelve_change(('add file', 'foo-id', 'file', 'foo'))
        creator.shelve_change(('add file', 'bar-id', 'directory', 'bar'))
        creator.transform()
        self.check_shelve_creation(creator, tree)

    def _test_shelve_symlink_creation(self, link_name, link_target,
                                      shelve_change=False):
        self.requireFeature(tests.SymlinkFeature)
        tree = self.make_branch_and_tree('.')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        tree.commit('Empty tree')
        os.symlink(link_target, link_name)
        tree.add(link_name, 'foo-id')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('add file', 'foo-id', 'symlink', link_name)],
                         list(creator.iter_shelvable()))
        if shelve_change:
            creator.shelve_change(('add file', 'foo-id', 'symlink', link_name))
        else:
            creator.shelve_creation('foo-id')
        creator.transform()
        s_trans_id = creator.shelf_transform.trans_id_file_id('foo-id')
        self.failIfExists(link_name)
        limbo_name = creator.shelf_transform._limbo_name(s_trans_id)
        self.assertEqual(link_target, osutils.readlink(limbo_name))
        ptree = creator.shelf_transform.get_preview_tree()
        self.assertEqual(link_target, ptree.get_symlink_target('foo-id'))

    def test_shelve_symlink_creation(self):
        self._test_shelve_symlink_creation('foo', 'bar')

    def test_shelve_unicode_symlink_creation(self):
        self.requireFeature(tests.UnicodeFilenameFeature)
        self._test_shelve_symlink_creation(u'fo\N{Euro Sign}o',
                                           u'b\N{Euro Sign}ar')

    def test_shelve_change_handles_symlink_creation(self):
        self._test_shelve_symlink_creation('foo', 'bar', shelve_change=True)

    def _test_shelve_symlink_target_change(self, link_name,
                                           old_target, new_target,
                                           shelve_change=False):
        self.requireFeature(tests.SymlinkFeature)
        tree = self.make_branch_and_tree('.')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        os.symlink(old_target, link_name)
        tree.add(link_name, 'foo-id')
        tree.commit("commit symlink")
        os.unlink(link_name)
        os.symlink(new_target, link_name)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('modify target', 'foo-id', link_name,
                           old_target, new_target)],
                         list(creator.iter_shelvable()))
        if shelve_change:
            creator.shelve_change(('modify target', 'foo-id', link_name,
                                   old_target, new_target))
        else:
            creator.shelve_modify_target('foo-id')
        creator.transform()
        self.assertEqual(old_target, osutils.readlink(link_name))
        s_trans_id = creator.shelf_transform.trans_id_file_id('foo-id')
        limbo_name = creator.shelf_transform._limbo_name(s_trans_id)
        self.assertEqual(new_target, osutils.readlink(limbo_name))
        ptree = creator.shelf_transform.get_preview_tree()
        self.assertEqual(new_target, ptree.get_symlink_target('foo-id'))

    def test_shelve_symlink_target_change(self):
        self._test_shelve_symlink_target_change('foo', 'bar', 'baz')

    def test_shelve_unicode_symlink_target_change(self):
        self.requireFeature(tests.UnicodeFilenameFeature)
        self._test_shelve_symlink_target_change(
            u'fo\N{Euro Sign}o', u'b\N{Euro Sign}ar', u'b\N{Euro Sign}az')

    def test_shelve_change_handles_symlink_target_change(self):
        self._test_shelve_symlink_target_change('foo', 'bar', 'baz',
                                                shelve_change=True)

    def test_shelve_creation_no_contents(self):
        tree = self.make_branch_and_tree('.')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        tree.commit('Empty tree')
        self.build_tree(['foo'])
        tree.add('foo', 'foo-id')
        os.unlink('foo')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('add file', 'foo-id', None, 'foo')],
                         sorted(list(creator.iter_shelvable())))
        creator.shelve_creation('foo-id')
        creator.transform()
        self.assertRaises(StopIteration,
                          tree.iter_entries_by_dir(['foo-id']).next)
        self.assertShelvedFileEqual('', creator, 'foo-id')
        s_trans_id = creator.shelf_transform.trans_id_file_id('foo-id')
        self.assertEqual('foo-id',
                         creator.shelf_transform.final_file_id(s_trans_id))
        self.failIfExists('foo')

    def prepare_shelve_deletion(self):
        tree = self.make_branch_and_tree('tree')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        self.build_tree_contents([('tree/foo/',), ('tree/foo/bar', 'baz')])
        tree.add(['foo', 'foo/bar'], ['foo-id', 'bar-id'])
        tree.commit('Added file and directory')
        tree.unversion(['foo-id', 'bar-id'])
        os.unlink('tree/foo/bar')
        os.rmdir('tree/foo')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('delete file', 'bar-id', 'file', 'foo/bar'),
                          ('delete file', 'foo-id', 'directory', 'foo')],
                          sorted(list(creator.iter_shelvable())))
        return creator, tree

    def check_shelve_deletion(self, tree):
        self.assertTrue('foo-id' in tree)
        self.assertTrue('bar-id' in tree)
        self.assertFileEqual('baz', 'tree/foo/bar')

    def test_shelve_deletion(self):
        creator, tree = self.prepare_shelve_deletion()
        creator.shelve_deletion('foo-id')
        creator.shelve_deletion('bar-id')
        creator.transform()
        self.check_shelve_deletion(tree)

    def test_shelve_change_handles_deletion(self):
        creator, tree = self.prepare_shelve_deletion()
        creator.shelve_change(('delete file', 'foo-id', 'directory', 'foo'))
        creator.shelve_change(('delete file', 'bar-id', 'file', 'foo/bar'))
        creator.transform()
        self.check_shelve_deletion(tree)

    def test_shelve_delete_contents(self):
        tree = self.make_branch_and_tree('tree')
        self.build_tree(['tree/foo',])
        tree.add('foo', 'foo-id')
        tree.commit('Added file and directory')
        os.unlink('tree/foo')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('delete file', 'foo-id', 'file', 'foo')],
                         sorted(list(creator.iter_shelvable())))
        creator.shelve_deletion('foo-id')
        creator.transform()
        self.failUnlessExists('tree/foo')

    def prepare_shelve_change_kind(self):
        tree = self.make_branch_and_tree('tree')
        self.build_tree_contents([('tree/foo', 'bar')])
        tree.add('foo', 'foo-id')
        tree.commit('Added file and directory')
        os.unlink('tree/foo')
        os.mkdir('tree/foo')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('change kind', 'foo-id', 'file', 'directory',
                           'foo')], sorted(list(creator.iter_shelvable())))
        return creator

    def check_shelve_change_kind(self, creator):
        self.assertFileEqual('bar', 'tree/foo')
        s_trans_id = creator.shelf_transform.trans_id_file_id('foo-id')
        self.assertEqual('directory',
                         creator.shelf_transform._new_contents[s_trans_id])

    def test_shelve_change_kind(self):
        creator = self.prepare_shelve_change_kind()
        creator.shelve_content_change('foo-id')
        creator.transform()
        self.check_shelve_change_kind(creator)

    def test_shelve_change_handles_change_kind(self):
        creator = self.prepare_shelve_change_kind()
        creator.shelve_change(('change kind', 'foo-id', 'file', 'directory',
                               'foo'))
        creator.transform()
        self.check_shelve_change_kind(creator)

    def test_shelve_change_unknown_change(self):
        tree = self.make_branch_and_tree('tree')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        e = self.assertRaises(ValueError, creator.shelve_change, ('unknown',))
        self.assertEqual('Unknown change kind: "unknown"', str(e))

    def test_shelve_unversion(self):
        tree = self.make_branch_and_tree('tree')
        self.build_tree(['tree/foo',])
        tree.add('foo', 'foo-id')
        tree.commit('Added file and directory')
        tree.unversion(['foo-id'])
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([('delete file', 'foo-id', 'file', 'foo')],
                         sorted(list(creator.iter_shelvable())))
        creator.shelve_deletion('foo-id')
        creator.transform()
        self.failUnlessExists('tree/foo')

    def test_shelve_serialization(self):
        tree = self.make_branch_and_tree('.')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        shelf_file = open('shelf', 'wb')
        self.addCleanup(shelf_file.close)
        try:
            creator.write_shelf(shelf_file)
        finally:
            shelf_file.close()
        self.assertFileEqual(EMPTY_SHELF, 'shelf')

    def test_write_shelf(self):
        tree = self.make_branch_and_tree('tree')
        self.build_tree(['tree/foo'])
        tree.add('foo', 'foo-id')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        list(creator.iter_shelvable())
        creator.shelve_creation('foo-id')
        shelf_file = open('shelf', 'wb')
        try:
            creator.write_shelf(shelf_file)
        finally:
            shelf_file.close()
        parser = pack.ContainerPushParser()
        shelf_file = open('shelf', 'rb')
        try:
            parser.accept_bytes(shelf_file.read())
        finally:
            shelf_file.close()
        tt = transform.TransformPreview(tree)
        self.addCleanup(tt.finalize)
        records = iter(parser.read_pending_records())
        #skip revision-id
        records.next()
        tt.deserialize(records)

    def test_shelve_unversioned(self):
        tree = self.make_branch_and_tree('tree')
        tree.lock_tree_write()
        try:
            self.assertRaises(errors.PathsNotVersionedError,
                              shelf.ShelfCreator, tree, tree.basis_tree(), ['foo'])
        finally:
            tree.unlock()
        # We should be able to lock/unlock the tree if ShelfCreator cleaned
        # after itself.
        wt = workingtree.WorkingTree.open('tree')
        wt.lock_tree_write()
        wt.unlock()
        # And a second tentative should raise the same error (no
        # limbo/pending_deletion leftovers).
        tree.lock_tree_write()
        try:
            self.assertRaises(errors.PathsNotVersionedError,
                              shelf.ShelfCreator, tree, tree.basis_tree(), ['foo'])
        finally:
            tree.unlock()

    def test_shelve_skips_added_root(self):
        """Skip adds of the root when iterating through shelvable changes."""
        tree = self.make_branch_and_tree('tree')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        self.assertEqual([], list(creator.iter_shelvable()))


class TestUnshelver(tests.TestCaseWithTransport):

    def test_make_merger(self):
        tree = self.make_branch_and_tree('tree')
        tree.commit('first commit')
        self.build_tree_contents([('tree/foo', 'bar')])
        tree.lock_write()
        self.addCleanup(tree.unlock)
        tree.add('foo', 'foo-id')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        list(creator.iter_shelvable())
        creator.shelve_creation('foo-id')
        shelf_file = open('shelf-file', 'w+b')
        try:
            creator.write_shelf(shelf_file)
            creator.transform()
            shelf_file.seek(0)
            unshelver = shelf.Unshelver.from_tree_and_shelf(tree, shelf_file)
            unshelver.make_merger().do_merge()
            self.assertFileEqual('bar', 'tree/foo')
        finally:
            shelf_file.close()

    def test_unshelve_changed(self):
        tree = self.make_branch_and_tree('tree')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        self.build_tree_contents([('tree/foo', 'a\nb\nc\n')])
        tree.add('foo', 'foo-id')
        tree.commit('first commit')
        self.build_tree_contents([('tree/foo', 'a\nb\nd\n')])
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        list(creator.iter_shelvable())
        creator.shelve_lines('foo-id', ['a\n', 'b\n', 'c\n'])
        shelf_file = open('shelf', 'w+b')
        self.addCleanup(shelf_file.close)
        creator.write_shelf(shelf_file)
        creator.transform()
        self.build_tree_contents([('tree/foo', 'z\na\nb\nc\n')])
        shelf_file.seek(0)
        unshelver = shelf.Unshelver.from_tree_and_shelf(tree, shelf_file)
        unshelver.make_merger().do_merge()
        self.assertFileEqual('z\na\nb\nd\n', 'tree/foo')

    def test_unshelve_deleted(self):
        tree = self.make_branch_and_tree('tree')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        self.build_tree_contents([('tree/foo/',), ('tree/foo/bar', 'baz')])
        tree.add(['foo', 'foo/bar'], ['foo-id', 'bar-id'])
        tree.commit('Added file and directory')
        tree.unversion(['foo-id', 'bar-id'])
        os.unlink('tree/foo/bar')
        os.rmdir('tree/foo')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        list(creator.iter_shelvable())
        creator.shelve_deletion('foo-id')
        creator.shelve_deletion('bar-id')
        shelf_file = open('shelf', 'w+b')
        self.addCleanup(shelf_file.close)
        creator.write_shelf(shelf_file)
        creator.transform()
        creator.finalize()
        # validate the test setup
        self.assertTrue('foo-id' in tree)
        self.assertTrue('bar-id' in tree)
        self.assertFileEqual('baz', 'tree/foo/bar')
        shelf_file.seek(0)
        unshelver = shelf.Unshelver.from_tree_and_shelf(tree, shelf_file)
        unshelver.make_merger().do_merge()
        self.assertFalse('foo-id' in tree)
        self.assertFalse('bar-id' in tree)

    def test_unshelve_base(self):
        tree = self.make_branch_and_tree('tree')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        tree.commit('rev1', rev_id='rev1')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        manager = tree.get_shelf_manager()
        shelf_id, shelf_file = manager.new_shelf()
        try:
            creator.write_shelf(shelf_file)
        finally:
            shelf_file.close()
        tree.commit('rev2', rev_id='rev2')
        shelf_file = manager.read_shelf(1)
        self.addCleanup(shelf_file.close)
        unshelver = shelf.Unshelver.from_tree_and_shelf(tree, shelf_file)
        self.addCleanup(unshelver.finalize)
        self.assertEqual('rev1', unshelver.base_tree.get_revision_id())

    def test_unshelve_serialization(self):
        tree = self.make_branch_and_tree('.')
        self.build_tree_contents([('shelf', EMPTY_SHELF)])
        shelf_file = open('shelf', 'rb')
        self.addCleanup(shelf_file.close)
        unshelver = shelf.Unshelver.from_tree_and_shelf(tree, shelf_file)
        unshelver.finalize()

    def test_corrupt_shelf(self):
        tree = self.make_branch_and_tree('.')
        self.build_tree_contents([('shelf', EMPTY_SHELF.replace('metadata',
                                                                'foo'))])
        shelf_file = open('shelf', 'rb')
        self.addCleanup(shelf_file.close)
        e = self.assertRaises(errors.ShelfCorrupt,
                              shelf.Unshelver.from_tree_and_shelf, tree,
                              shelf_file)
        self.assertEqual('Shelf corrupt.', str(e))


class TestShelfManager(tests.TestCaseWithTransport):

    def test_get_shelf_manager(self):
        tree = self.make_branch_and_tree('.')
        manager = tree.get_shelf_manager()
        self.assertEqual(tree._transport.base + 'shelf/',
                         manager.transport.base)

    def get_manager(self):
        return self.make_branch_and_tree('.').get_shelf_manager()

    def test_get_shelf_filename(self):
        tree = self.make_branch_and_tree('.')
        manager = tree.get_shelf_manager()
        self.assertEqual('shelf-1', manager.get_shelf_filename(1))

    def test_get_shelf_ids(self):
        tree = self.make_branch_and_tree('.')
        manager = tree.get_shelf_manager()
        self.assertEqual([1, 3], manager.get_shelf_ids(
                         ['shelf-1', 'shelf-02', 'shelf-3']))

    def test_new_shelf(self):
        manager = self.get_manager()
        shelf_id, shelf_file = manager.new_shelf()
        shelf_file.close()
        self.assertEqual(1, shelf_id)
        shelf_id, shelf_file = manager.new_shelf()
        shelf_file.close()
        self.assertEqual(2, shelf_id)
        manager.delete_shelf(1)
        shelf_id, shelf_file = manager.new_shelf()
        shelf_file.close()
        self.assertEqual(3, shelf_id)

    def test_active_shelves(self):
        manager = self.get_manager()
        self.assertEqual([], manager.active_shelves())
        shelf_id, shelf_file = manager.new_shelf()
        shelf_file.close()
        self.assertEqual([1], manager.active_shelves())

    def test_delete_shelf(self):
        manager = self.get_manager()
        shelf_id, shelf_file = manager.new_shelf()
        shelf_file.close()
        self.assertEqual([1], manager.active_shelves())
        manager.delete_shelf(1)
        self.assertEqual([], manager.active_shelves())

    def test_last_shelf(self):
        manager = self.get_manager()
        self.assertIs(None, manager.last_shelf())
        shelf_id, shelf_file = manager.new_shelf()
        shelf_file.close()
        self.assertEqual(1, manager.last_shelf())

    def test_read_shelf(self):
        manager = self.get_manager()
        shelf_id, shelf_file = manager.new_shelf()
        try:
            shelf_file.write('foo')
        finally:
            shelf_file.close()
        shelf_id, shelf_file = manager.new_shelf()
        try:
            shelf_file.write('bar')
        finally:
            shelf_file.close()
        shelf_file = manager.read_shelf(1)
        try:
            self.assertEqual('foo', shelf_file.read())
        finally:
            shelf_file.close()
        shelf_file = manager.read_shelf(2)
        try:
            self.assertEqual('bar', shelf_file.read())
        finally:
            shelf_file.close()

    def test_read_non_existant(self):
        manager = self.get_manager()
        e = self.assertRaises(errors.NoSuchShelfId, manager.read_shelf, 1)
        self.assertEqual('No changes are shelved with id "1".', str(e))

    def test_shelve_changes(self):
        tree = self.make_branch_and_tree('tree')
        tree.commit('no-change commit')
        tree.lock_write()
        self.addCleanup(tree.unlock)
        self.build_tree_contents([('tree/foo', 'bar')])
        self.assertFileEqual('bar', 'tree/foo')
        tree.add('foo', 'foo-id')
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        list(creator.iter_shelvable())
        creator.shelve_creation('foo-id')
        shelf_manager = tree.get_shelf_manager()
        shelf_id = shelf_manager.shelve_changes(creator)
        self.failIfExists('tree/foo')
        unshelver = shelf_manager.get_unshelver(shelf_id)
        unshelver.make_merger().do_merge()
        self.assertFileEqual('bar', 'tree/foo')

    def test_get_metadata(self):
        tree = self.make_branch_and_tree('.')
        tree.lock_tree_write()
        self.addCleanup(tree.unlock)
        creator = shelf.ShelfCreator(tree, tree.basis_tree())
        self.addCleanup(creator.finalize)
        shelf_manager = tree.get_shelf_manager()
        shelf_id = shelf_manager.shelve_changes(creator, 'foo')
        metadata = shelf_manager.get_metadata(shelf_id)
        self.assertEqual('foo', metadata['message'])
        self.assertEqual('null:', metadata['revision_id'])