# Copyright (C) 2006-2009, 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

import os

from bzrlib import errors, tests, workingtree
from bzrlib.tests.per_workingtree import TestCaseWithWorkingTree


class TestBasisInventory(TestCaseWithWorkingTree):

    def make_trees(self):
        tree = self.make_branch_and_tree('tree')
        tree.set_root_id('root-id')
        self.build_tree(['tree/file1'])
        tree.add('file1', 'file1-id')
        sub_tree = self.make_branch_and_tree('tree/sub-tree')
        sub_tree.set_root_id('sub-tree-root-id')
        sub_tree.commit('commit', rev_id='sub_1')
        return tree, sub_tree

    def _references_unsupported(self, tree):
        if not tree.supports_tree_reference():
            raise tests.TestSkipped('Tree format does not support references')
        else:
            self.fail('%r does not support references but should'
                % (tree, ))

    def make_nested_trees(self):
        tree, sub_tree = self.make_trees()
        try:
            tree.add_reference(sub_tree)
        except errors.UnsupportedOperation:
            self._references_unsupported(tree)
        return tree, sub_tree

    def test_add_reference(self):
        self.make_nested_trees()
        tree = workingtree.WorkingTree.open('tree')
        tree.lock_write()
        try:
            self.assertEqual(tree.path2id('sub-tree'), 'sub-tree-root-id')
            self.assertEqual(tree.inventory['sub-tree-root-id'].kind,
                             'tree-reference')
            tree.commit('commit reference')
            basis = tree.basis_tree()
            basis.lock_read()
            try:
                sub_tree = tree.get_nested_tree('sub-tree-root-id')
                self.assertEqual(sub_tree.last_revision(),
                    tree.get_reference_revision('sub-tree-root-id'))
            finally:
                basis.unlock()
        finally:
            tree.unlock()

    def test_add_reference_same_root(self):
        tree = self.make_branch_and_tree('tree')
        self.build_tree(['tree/file1'])
        tree.add('file1', 'file1-id')
        tree.set_root_id('root-id')
        sub_tree = self.make_branch_and_tree('tree/sub-tree')
        sub_tree.set_root_id('root-id')
        try:
            self.assertRaises(errors.BadReferenceTarget, tree.add_reference,
                              sub_tree)
        except errors.UnsupportedOperation:
            self._references_unsupported(tree)

    def test_root_present(self):
        """Subtree root is present, though not the working tree root"""
        tree, sub_tree = self.make_trees()
        sub_tree.set_root_id('file1-id')
        try:
            self.assertRaises(errors.BadReferenceTarget, tree.add_reference,
                              sub_tree)
        except errors.UnsupportedOperation:
            self._references_unsupported(tree)

    def test_add_non_subtree(self):
        tree, sub_tree = self.make_trees()
        os.rename('tree/sub-tree', 'sibling')
        sibling = workingtree.WorkingTree.open('sibling')
        try:
            self.assertRaises(errors.BadReferenceTarget, tree.add_reference,
                              sibling)
        except errors.UnsupportedOperation:
            self._references_unsupported(tree)

    def test_get_nested_tree(self):
        tree, sub_tree = self.make_nested_trees()
        tree.lock_read()
        try:
            sub_tree2 = tree.get_nested_tree('sub-tree-root-id')
            self.assertEqual(sub_tree.basedir, sub_tree2.basedir)
            sub_tree2 = tree.get_nested_tree('sub-tree-root-id', 'sub-tree')
        finally:
            tree.unlock()
