# -*- coding: utf-8 -*-
# Unix SMB/CIFS implementation. Tests for smb manipulation
# Copyright (C) David Mulder <dmulder@suse.com> 2018
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

import samba
import os
import random
import sys
from samba import smb
from samba import NTSTATUSError
from samba.ntstatus import NT_STATUS_OBJECT_NAME_NOT_FOUND

PY3 = sys.version_info[0] == 3
addom = 'addom.samba.example.com/'
test_contents = 'abcd' * 256
utf_contents = u'Süßigkeiten Äpfel ' * 128
test_literal_bytes_embed_nulls = b'\xff\xfe\x14\x61\x00\x00\x62\x63\x64' * 256
binary_contents = b'\xff\xfe'
binary_contents = binary_contents + "Hello cruel world of python3".encode('utf8') * 128
test_dir = os.path.join(addom, 'testing_%d' % random.randint(0, 0xFFFF))
test_file = os.path.join(test_dir, 'testing').replace('/', '\\')


class SMBTests(samba.tests.TestCase):
    def setUp(self):
        super(SMBTests, self).setUp()
        self.server = os.environ["SERVER"]
        creds = self.insta_creds(template=self.get_credentials())
        self.conn = smb.SMB(self.server,
                            "sysvol",
                            lp=self.get_loadparm(),
                            creds=creds)
        self.conn.mkdir(test_dir)

    def tearDown(self):
        super(SMBTests, self).tearDown()
        try:
            self.conn.deltree(test_dir)
        except:
            pass

    def test_list(self):
        ls = [f['name'] for f in self.conn.list(addom)]
        self.assertIn('scripts', ls,
                      msg='"scripts" directory not found in sysvol')
        self.assertIn('Policies', ls,
                      msg='"Policies" directory not found in sysvol')

    def file_exists(self, filepath):
        """Returns whether a regular file exists (by trying to open it)"""
        try:
            self.conn.loadfile(filepath)
            exists = True;
        except NTSTATUSError as err:
            if err.args[0] == NT_STATUS_OBJECT_NAME_NOT_FOUND:
                exists = False
            else:
                raise err
        return exists

    def test_unlink(self):
        """
        The smb.unlink API should delete file
        """
        # create the test file
        self.assertFalse(self.file_exists(test_file))
        self.conn.savefile(test_file, binary_contents)
        self.assertTrue(self.file_exists(test_file))

        # delete it and check that it's gone
        self.conn.unlink(test_file)
        self.assertFalse(self.file_exists(test_file))

    def test_chkpath(self):
        """Tests .chkpath determines whether or not a directory exists"""

        self.assertTrue(self.conn.chkpath(test_dir))

        # should return False for a non-existent directory
        bad_dir = self.make_sysvol_path(test_dir, 'dont_exist')
        self.assertFalse(self.conn.chkpath(bad_dir))

        # should return False for files (because they're not directories)
        self.conn.savefile(test_file, binary_contents)
        self.assertFalse(self.conn.chkpath(test_file))

        # check correct result after creating and then deleting a new dir
        new_dir = self.make_sysvol_path(test_dir, 'test-new')
        self.conn.mkdir(new_dir)
        self.assertTrue(self.conn.chkpath(new_dir))
        self.conn.rmdir(new_dir)
        self.assertFalse(self.conn.chkpath(new_dir))

    def test_save_load_text(self):

        self.conn.savefile(test_file, test_contents.encode('utf8'))

        contents = self.conn.loadfile(test_file)
        self.assertEquals(contents.decode('utf8'), test_contents,
                          msg='contents of test file did not match what was written')

    # with python2 this will save/load str type (with embedded nulls)
    # with python3 this will save/load bytes type
    def test_save_load_string_bytes(self):
        self.conn.savefile(test_file, test_literal_bytes_embed_nulls)

        contents = self.conn.loadfile(test_file)
        self.assertEquals(contents, test_literal_bytes_embed_nulls,
                          msg='contents of test file did not match what was written')

    # python3 only this will save/load unicode
    def test_save_load_utfcontents(self):
        if PY3:
            self.conn.savefile(test_file, utf_contents.encode('utf8'))

            contents = self.conn.loadfile(test_file)
            self.assertEquals(contents.decode('utf8'), utf_contents,
                              msg='contents of test file did not match what was written')

    # with python2 this will save/load str type
    # with python3 this will save/load bytes type
    def test_save_binary_contents(self):
        self.conn.savefile(test_file, binary_contents)

        contents = self.conn.loadfile(test_file)
        self.assertEquals(contents, binary_contents,
                          msg='contents of test file did not match what was written')

    def make_sysvol_path(self, dirpath, filename):
        # return the dir + filename as a sysvol path
        return os.path.join(dirpath, filename).replace('/', '\\')