# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# 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 os
import shutil
import tempfile

from mock import Mock

from twisted.internet import defer, reactor

from synapse.rest.media.v1._base import FileInfo
from synapse.rest.media.v1.filepath import MediaFilePaths
from synapse.rest.media.v1.media_storage import MediaStorage
from synapse.rest.media.v1.storage_provider import FileStorageProviderBackend

from tests import unittest


class MediaStorageTests(unittest.TestCase):
    def setUp(self):
        self.test_dir = tempfile.mkdtemp(prefix="synapse-tests-")

        self.primary_base_path = os.path.join(self.test_dir, "primary")
        self.secondary_base_path = os.path.join(self.test_dir, "secondary")

        hs = Mock()
        hs.get_reactor = Mock(return_value=reactor)
        hs.config.media_store_path = self.primary_base_path

        storage_providers = [FileStorageProviderBackend(
            hs, self.secondary_base_path
        )]

        self.filepaths = MediaFilePaths(self.primary_base_path)
        self.media_storage = MediaStorage(
            hs, self.primary_base_path, self.filepaths, storage_providers,
        )

    def tearDown(self):
        shutil.rmtree(self.test_dir)

    @defer.inlineCallbacks
    def test_ensure_media_is_in_local_cache(self):
        media_id = "some_media_id"
        test_body = "Test\n"

        # First we create a file that is in a storage provider but not in the
        # local primary media store
        rel_path = self.filepaths.local_media_filepath_rel(media_id)
        secondary_path = os.path.join(self.secondary_base_path, rel_path)

        os.makedirs(os.path.dirname(secondary_path))

        with open(secondary_path, "w") as f:
            f.write(test_body)

        # Now we run ensure_media_is_in_local_cache, which should copy the file
        # to the local cache.
        file_info = FileInfo(None, media_id)
        local_path = yield self.media_storage.ensure_media_is_in_local_cache(file_info)

        self.assertTrue(os.path.exists(local_path))

        # Asserts the file is under the expected local cache directory
        self.assertEquals(
            os.path.commonprefix([self.primary_base_path, local_path]),
            self.primary_base_path,
        )

        with open(local_path) as f:
            body = f.read()

        self.assertEqual(test_body, body)