# Copyright (C) 2005 by 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tests for the osutils wrapper.
"""

import os
import sys

import bzrlib
from bzrlib.errors import BzrBadParameterNotUnicode
import bzrlib.osutils as osutils
from bzrlib.tests import TestCaseInTempDir, TestCase


class TestOSUtils(TestCaseInTempDir):

    def test_fancy_rename(self):
        # This should work everywhere
        def rename(a, b):
            osutils.fancy_rename(a, b,
                    rename_func=os.rename,
                    unlink_func=os.unlink)

        open('a', 'wb').write('something in a\n')
        rename('a', 'b')
        self.failIfExists('a')
        self.failUnlessExists('b')
        self.check_file_contents('b', 'something in a\n')

        open('a', 'wb').write('new something in a\n')
        rename('b', 'a')

        self.check_file_contents('a', 'something in a\n')

    def test_rename(self):
        # Rename should be semi-atomic on all platforms
        open('a', 'wb').write('something in a\n')
        osutils.rename('a', 'b')
        self.failIfExists('a')
        self.failUnlessExists('b')
        self.check_file_contents('b', 'something in a\n')

        open('a', 'wb').write('new something in a\n')
        osutils.rename('b', 'a')

        self.check_file_contents('a', 'something in a\n')

    # TODO: test fancy_rename using a MemoryTransport

    def test_01_rand_chars_empty(self):
        result = osutils.rand_chars(0)
        self.assertEqual(result, '')

    def test_02_rand_chars_100(self):
        result = osutils.rand_chars(100)
        self.assertEqual(len(result), 100)
        self.assertEqual(type(result), str)
        self.assertContainsRe(result, r'^[a-z0-9]{100}$')


class TestSafeUnicode(TestCase):

    def test_from_ascii_string(self):
        self.assertEqual(u'foobar', osutils.safe_unicode('foobar'))

    def test_from_unicode_string_ascii_contents(self):
        self.assertEqual(u'bargam', osutils.safe_unicode(u'bargam'))

    def test_from_unicode_string_unicode_contents(self):
        self.assertEqual(u'bargam\xae', osutils.safe_unicode(u'bargam\xae'))

    def test_from_utf8_string(self):
        self.assertEqual(u'foo\xae', osutils.safe_unicode('foo\xc2\xae'))

    def test_bad_utf8_string(self):
        self.assertRaises(BzrBadParameterNotUnicode,
                          osutils.safe_unicode,
                          '\xbb\xbb')


class TestSplitLines(TestCase):

    def test_split_unicode(self):
        self.assertEqual([u'foo\n', u'bar\xae'],
                         osutils.split_lines(u'foo\nbar\xae'))
        self.assertEqual([u'foo\n', u'bar\xae\n'],
                         osutils.split_lines(u'foo\nbar\xae\n'))

    def test_split_with_carriage_returns(self):
        self.assertEqual(['foo\rbar\n'],
                         osutils.split_lines('foo\rbar\n'))