# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2012 Red Hat, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import contextlib
import os
import shutil
import StringIO
import stubout
import textwrap
import tempfile
import unittest
import uuid

from nova.compat import flagfile
from nova import test


class ThatLastTwoPercentCoverageTestCase(unittest.TestCase):
    def test_open_file_for_reading(self):
        with flagfile._open_file_for_reading(__file__):
            pass

    def test_open_fd_for_writing(self):
        (fd, path) = tempfile.mkstemp()
        try:
            with flagfile._open_fd_for_writing(fd, None):
                pass
        finally:
            os.remove(path)


class CompatFlagfileTestCase(test.TestCase):
    def setUp(self):
        super(CompatFlagfileTestCase, self).setUp()
        self.files = {}
        self.tempdir = str(uuid.uuid4())
        self.tempfiles = []

        self.stubs.Set(flagfile, '_open_file_for_reading', self._fake_open)
        self.stubs.Set(flagfile, '_open_fd_for_writing', self._fake_open)
        self.stubs.Set(tempfile, 'mkdtemp', self._fake_mkdtemp)
        self.stubs.Set(tempfile, 'mkstemp', self._fake_mkstemp)
        self.stubs.Set(shutil, 'rmtree', self._fake_rmtree)

    def _fake_open(self, *args):
        @contextlib.contextmanager
        def managed_stringio(path):
            if not path in self.files:
                self.files[path] = ""
            sio = StringIO.StringIO(textwrap.dedent(self.files[path]))
            try:
                yield sio
            finally:
                self.files[path] = sio.getvalue()
                sio.close()
        if len(args) == 2:
            args = args[1:]  # remove the fd arg for fdopen() case
        return managed_stringio(args[0])

    def _fake_mkstemp(self, *args, **kwargs):
        self.assertTrue('dir' in kwargs)
        self.assertEquals(kwargs['dir'], self.tempdir)
        self.tempfiles.append(str(uuid.uuid4()))
        return (None, self.tempfiles[-1])

    def _fake_mkdtemp(self, *args, **kwargs):
        return self.tempdir

    def _fake_rmtree(self, path):
        self.assertEquals(self.tempdir, path)
        self.tempdir = None

    def test_no_args(self):
        before = []
        after = flagfile.handle_flagfiles(before, tempdir=self.tempdir)
        self.assertEquals(after, before)

    def _do_test_empty_flagfile(self, before):
        self.files['foo.flags'] = ''
        after = flagfile.handle_flagfiles(before, tempdir=self.tempdir)
        self.assertEquals(after, ['--config-file=' + self.tempfiles[-1]])
        self.assertEquals(self.files[self.tempfiles[-1]], '[DEFAULT]\n')

    def test_empty_flagfile(self):
        self._do_test_empty_flagfile(['--flagfile=foo.flags'])

    def test_empty_flagfile_separated(self):
        self._do_test_empty_flagfile(['--flagfile', 'foo.flags'])

    def test_empty_flagfile_single_hyphen(self):
        self._do_test_empty_flagfile(['-flagfile=foo.flags'])

    def test_empty_flagfile_single_hyphen_separated_separated(self):
        self._do_test_empty_flagfile(['-flagfile', 'foo.flags'])

    def test_empty_flagfile_with_other_args(self):
        self.files['foo.flags'] = ''

        before = [
            '--foo', 'bar',
            '--flagfile=foo.flags',
            '--blaa=foo',
            '--foo-flagfile',
            '--flagfile-foo'
            ]

        after = flagfile.handle_flagfiles(before, tempdir=self.tempdir)

        self.assertEquals(after, [
                '--foo', 'bar',
                '--config-file=' + self.tempfiles[-1],
                '--blaa=foo',
                '--foo-flagfile',
                '--flagfile-foo'])
        self.assertEquals(self.files[self.tempfiles[-1]], '[DEFAULT]\n')

    def _do_test_flagfile(self, flags, conf):
        self.files['foo.flags'] = flags

        before = ['--flagfile=foo.flags']

        after = flagfile.handle_flagfiles(before, tempdir=self.tempdir)

        self.assertEquals(after,
                          ['--config-file=' + t
                           for t in reversed(self.tempfiles)])
        self.assertEquals(self.files[self.tempfiles[-1]],
                          '[DEFAULT]\n' + conf)

    def test_flagfile(self):
        self._do_test_flagfile('--bar=foo', 'bar=foo\n')

    def test_boolean_flag(self):
        self._do_test_flagfile('--verbose', 'verbose=true\n')

    def test_boolean_inverted_flag(self):
        self._do_test_flagfile('--noverbose', 'verbose=false\n')

    def test_flagfile_comments(self):
        self._do_test_flagfile('--bar=foo\n#foo\n--foo=bar\n//bar',
                               'bar=foo\nfoo=bar\n')

    def test_flagfile_nested(self):
        self.files['bar.flags'] = '--foo=bar'

        self._do_test_flagfile('--flagfile=bar.flags', '')

        self.assertEquals(self.files[self.tempfiles[-2]],
                          '[DEFAULT]\nfoo=bar\n')

    def test_flagfile_managed(self):
        self.files['foo.flags'] = ''
        before = ['--flagfile=foo.flags']
        with flagfile.handle_flagfiles_managed(before) as after:
            self.assertEquals(after, ['--config-file=' + self.tempfiles[-1]])
            self.assertEquals(self.files[self.tempfiles[-1]], '[DEFAULT]\n')
        self.assertTrue(self.tempdir is None)