#
# Copyright (c) 2009 Testrepository Contributors
# 
# Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
# license at the users choice. A copy of both licenses are available in the
# project source as Apache-2.0 and BSD. You may not use this file except in
# compliance with one of these two licences.
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under these licenses is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
# license you chose for the specific language governing permissions and
# limitations under that license.

"""Tests for the file repository implementation."""

import os.path
import shutil
import tempfile

from fixtures import Fixture
from testtools.matchers import Raises, MatchesException

from testrepository.repository import file
from testrepository.tests import ResourcedTestCase
from testrepository.tests.stubpackage import TempDirResource


class FileRepositoryFixture(Fixture):

    def __init__(self, case):
        self.tempdir = case.tempdir
        self.resource = case.resources[0][1]

    def setUp(self):
        super(FileRepositoryFixture, self).setUp()
        self.repo = file.RepositoryFactory().initialise(self.tempdir)
        self.resource.dirtied(self.tempdir)


class HomeDirTempDir(Fixture):
    """Creates a temporary directory in ~."""

    def setUp(self):
        super(HomeDirTempDir, self).setUp()
        home_dir = os.path.expanduser('~')
        self.temp_dir = tempfile.mkdtemp(dir=home_dir)
        self.addCleanup(shutil.rmtree, self.temp_dir)
        self.short_path = os.path.join('~', os.path.basename(self.temp_dir))


class TestFileRepository(ResourcedTestCase):

    resources = [('tempdir', TempDirResource())]

    def test_initialise(self):
        self.useFixture(FileRepositoryFixture(self))
        base = os.path.join(self.tempdir, '.testrepository')
        stream = open(os.path.join(base, 'format'), 'rt')
        try:
            contents = stream.read()
        finally:
            stream.close()
        self.assertEqual("1\n", contents)
        stream = open(os.path.join(base, 'next-stream'), 'rt')
        try:
            contents = stream.read()
        finally:
            stream.close()
        self.assertEqual("0\n", contents)

    def test_initialise_expands_user_directory(self):
        short_path = self.useFixture(HomeDirTempDir()).short_path
        repo = file.RepositoryFactory().initialise(short_path)
        self.assertTrue(os.path.exists(repo.base))

    def test_inserter_output_path(self):
        repo = self.useFixture(FileRepositoryFixture(self)).repo
        inserter = repo.get_inserter()
        inserter.startTestRun()
        inserter.stopTestRun()
        self.assertTrue(os.path.exists(os.path.join(repo.base, '0')))

    def test_inserting_creates_id(self):
        # When inserting a stream, an id is returned from stopTestRun.
        repo = self.useFixture(FileRepositoryFixture(self)).repo
        result = repo.get_inserter()
        result.startTestRun()
        result.stopTestRun()
        self.assertEqual(0, result.get_id())

    def test_open_expands_user_directory(self):
        short_path = self.useFixture(HomeDirTempDir()).short_path
        repo1 = file.RepositoryFactory().initialise(short_path)
        repo2 = file.RepositoryFactory().open(short_path)
        self.assertEqual(repo1.base, repo2.base)

    def test_next_stream_corruption_error(self):
        repo = self.useFixture(FileRepositoryFixture(self)).repo
        open(os.path.join(repo.base, 'next-stream'), 'wb').close()
        self.assertThat(repo.count, Raises(
            MatchesException(ValueError("Corrupt next-stream file: ''"))))

    def test_get_test_run_unexpected_ioerror_errno(self):
        repo = self.useFixture(FileRepositoryFixture(self)).repo
        inserter = repo.get_inserter()
        inserter.startTestRun()
        inserter.stopTestRun()
        os.chmod(os.path.join(repo.base, '0'), 0000)
        self.assertRaises(IOError, repo.get_test_run, '0')
