# -*- coding: utf-8 -*-
import shutil
import tempfile

from Crypto.Cipher import AES
import mock
from twisted.trial import unittest
from twisted.internet import defer

from lbrynet.core import BlobManager
from lbrynet.core import Session
from lbrynet.core.server import DHTHashAnnouncer
from lbrynet.file_manager import EncryptedFileCreator
from lbrynet.file_manager import EncryptedFileManager

from tests import mocks
from tests.util import mk_db_and_blob_dir, rm_db_and_blob_dir

MB = 2**20


def iv_generator():
    while True:
        yield '3' * AES.block_size


class CreateEncryptedFileTest(unittest.TestCase):
    timeout = 5
    def setUp(self):
        mocks.mock_conf_settings(self)
        self.tmp_db_dir, self.tmp_blob_dir = mk_db_and_blob_dir()

    @defer.inlineCallbacks
    def tearDown(self):
        yield self.blob_manager.stop()
        rm_db_and_blob_dir(self.tmp_db_dir, self.tmp_blob_dir)

    def create_file(self, filename):
        session = mock.Mock(spec=Session.Session)(None, None)
        hash_announcer = DHTHashAnnouncer.DHTHashAnnouncer(None, None)
        self.blob_manager = BlobManager.DiskBlobManager(hash_announcer, self.tmp_blob_dir, self.tmp_db_dir)
        session.blob_manager = self.blob_manager
        session.blob_manager.setup()
        session.db_dir = self.tmp_db_dir
        manager = mock.Mock(spec=EncryptedFileManager.EncryptedFileManager)()
        handle = mocks.GenFile(3*MB, '1')
        key = '2'*AES.block_size
        return EncryptedFileCreator.create_lbry_file(
            session, manager, filename, handle, key, iv_generator())

    def test_can_create_file(self):
        expected_stream_hash = ('41e6b247d923d191b154fb6f1b8529d6ddd6a73d65c357b1acb7'
                                '42dd83151fb66393a7709e9f346260a4f4db6de10c25')
        filename = 'test.file'
        d = self.create_file(filename)
        d.addCallback(self.assertEqual, expected_stream_hash)
        return d

    def test_can_create_file_with_unicode_filename(self):
        expected_stream_hash = ('d1da4258f3ce12edb91d7e8e160d091d3ab1432c2e55a6352dce0'
                                '2fd5adb86fe144e93e110075b5865fff8617776c6c0')
        filename = u'☃.file'
        d = self.create_file(filename)
        d.addCallback(self.assertEqual, expected_stream_hash)
        return d