import json
import mock
from twisted.trial import unittest
from twisted.internet import defer

from cryptography.hazmat.primitives.ciphers.algorithms import AES
from lbrynet.database.storage import SQLiteStorage
from lbrynet.core.StreamDescriptor import get_sd_info, BlobStreamDescriptorReader
from lbrynet.core.StreamDescriptor import StreamDescriptorIdentifier
from lbrynet.core.BlobManager import DiskBlobManager
from lbrynet.core.PeerManager import PeerManager
from lbrynet.core.RateLimiter import DummyRateLimiter
from lbrynet.core.PaymentRateManager import OnlyFreePaymentsManager
from lbrynet.database.storage import SQLiteStorage
from lbrynet.file_manager import EncryptedFileCreator
from lbrynet.file_manager.EncryptedFileManager import EncryptedFileManager
from lbrynet.core.StreamDescriptor import JSONBytesEncoder
from tests import mocks
from tests.util import mk_db_and_blob_dir, rm_db_and_blob_dir


FakeNode = mocks.Node
FakeWallet = mocks.Wallet
FakePeerFinder = mocks.PeerFinder
FakeAnnouncer = mocks.Announcer
GenFile = mocks.GenFile
test_create_stream_sd_file = mocks.create_stream_sd_file
DummyBlobAvailabilityTracker = mocks.BlobAvailabilityTracker

MB = 2**20


def iv_generator():
    while True:
        yield b'3' * (AES.block_size // 8)


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()
        self.wallet = FakeWallet()
        self.peer_manager = PeerManager()
        self.peer_finder = FakePeerFinder(5553, self.peer_manager, 2)
        self.rate_limiter = DummyRateLimiter()
        self.sd_identifier = StreamDescriptorIdentifier()
        self.storage = SQLiteStorage(self.tmp_db_dir)
        self.blob_manager = DiskBlobManager(self.tmp_blob_dir, self.storage)
        self.prm = OnlyFreePaymentsManager()
        self.lbry_file_manager = EncryptedFileManager(self.peer_finder, self.rate_limiter, self.blob_manager,
                                                      self.wallet, self.prm, self.storage, self.sd_identifier)
        d = self.storage.setup()
        d.addCallback(lambda _: self.lbry_file_manager.setup())
        return d

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

    @defer.inlineCallbacks
    def create_file(self, filename):
        handle = mocks.GenFile(3*MB, b'1')
        key = b'2' * (AES.block_size // 8)
        out = yield EncryptedFileCreator.create_lbry_file(
            self.blob_manager, self.storage, self.prm, self.lbry_file_manager, filename, handle, key, iv_generator()
        )
        defer.returnValue(out)

    @defer.inlineCallbacks
    def test_can_create_file(self):
        expected_stream_hash = "41e6b247d923d191b154fb6f1b8529d6ddd6a73d65c35" \
                               "7b1acb742dd83151fb66393a7709e9f346260a4f4db6de10c25"
        expected_sd_hash = "40c485432daec586c1a2d247e6c08d137640a5af6e81f3f652" \
                           "3e62e81a2e8945b0db7c94f1852e70e371d917b994352c"
        filename = 'test.file'
        lbry_file = yield self.create_file(filename)
        sd_hash = yield self.storage.get_sd_blob_hash_for_stream(lbry_file.stream_hash)

        # read the sd blob file
        sd_blob = self.blob_manager.blobs[sd_hash]
        sd_reader = BlobStreamDescriptorReader(sd_blob)
        sd_file_info = yield sd_reader.get_info()

        # this comes from the database, the blobs returned are sorted
        sd_info = yield get_sd_info(self.storage, lbry_file.stream_hash, include_blobs=True)
        self.maxDiff = None
        unicode_sd_info = json.loads(json.dumps(sd_info, sort_keys=True, cls=JSONBytesEncoder))
        self.assertDictEqual(unicode_sd_info, sd_file_info)
        self.assertEqual(sd_info['stream_hash'], expected_stream_hash)
        self.assertEqual(len(sd_info['blobs']), 3)
        self.assertNotEqual(sd_info['blobs'][0]['length'], 0)
        self.assertNotEqual(sd_info['blobs'][1]['length'], 0)
        self.assertEqual(sd_info['blobs'][2]['length'], 0)
        self.assertEqual(expected_stream_hash, lbry_file.stream_hash)
        self.assertEqual(sd_hash, lbry_file.sd_hash)
        self.assertEqual(sd_hash, expected_sd_hash)
        blobs = yield self.blob_manager.get_all_verified_blobs()
        self.assertEqual(3, len(blobs))
        num_should_announce_blobs = yield self.blob_manager.count_should_announce_blobs()
        self.assertEqual(2, num_should_announce_blobs)

    @defer.inlineCallbacks
    def test_can_create_file_with_unicode_filename(self):
        expected_stream_hash = ('d1da4258f3ce12edb91d7e8e160d091d3ab1432c2e55a6352dce0'
                                '2fd5adb86fe144e93e110075b5865fff8617776c6c0')
        filename = u'☃.file'
        lbry_file = yield self.create_file(filename)
        self.assertEqual(expected_stream_hash, lbry_file.stream_hash)