import os
import shutil
import tempfile
from hashlib import md5
from twisted.trial.unittest import TestCase
from twisted.internet import defer, threads
from lbrynet.core.StreamDescriptor import StreamDescriptorIdentifier
from lbrynet.core.BlobManager import DiskBlobManager
from lbrynet.core.StreamDescriptor import get_sd_info
from lbrynet.core.PeerManager import PeerManager
from lbrynet.core.RateLimiter import DummyRateLimiter
from lbrynet.database.storage import SQLiteStorage
from lbrynet.core.PaymentRateManager import OnlyFreePaymentsManager
from lbrynet.file_manager.EncryptedFileCreator import create_lbry_file
from lbrynet.file_manager.EncryptedFileManager import EncryptedFileManager
from tests import mocks


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


class TestStreamify(TestCase):
    maxDiff = 5000

    def setUp(self):
        mocks.mock_conf_settings(self)
        self.session = None
        self.lbry_file_manager = None
        self.is_generous = True
        self.db_dir = tempfile.mkdtemp()
        self.blob_dir = os.path.join(self.db_dir, "blobfiles")
        os.mkdir(self.blob_dir)
        self.dht_node = FakeNode()
        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.db_dir)
        self.blob_manager = DiskBlobManager(self.blob_dir, self.storage, self.dht_node._dataStore)
        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):
        lbry_files = self.lbry_file_manager.lbry_files
        for lbry_file in lbry_files:
            yield self.lbry_file_manager.delete_lbry_file(lbry_file)
        yield self.lbry_file_manager.stop()
        yield self.storage.stop()
        yield threads.deferToThread(shutil.rmtree, self.db_dir)
        if os.path.exists("test_file"):
            os.remove("test_file")

    def test_create_stream(self):

        def verify_equal(sd_info):
            self.assertEqual(sd_info, test_create_stream_sd_file)

        def verify_stream_descriptor_file(stream_hash):
            d = get_sd_info(self.storage, stream_hash, True)
            d.addCallback(verify_equal)
            return d

        def iv_generator():
            iv = 0
            while 1:
                iv += 1
                yield b"%016d" % iv

        def create_stream():
            test_file = GenFile(5209343, bytes((i + 3) for i in range(0, 64, 6)))
            d = create_lbry_file(
                self.blob_manager, self.storage, self.prm, self.lbry_file_manager, "test_file", test_file,
                key=b'0123456701234567', iv_generator=iv_generator()
            )
            d.addCallback(lambda lbry_file: lbry_file.stream_hash)
            return d

        d = create_stream()
        d.addCallback(verify_stream_descriptor_file)
        return d

    @defer.inlineCallbacks
    def test_create_and_combine_stream(self):
        test_file = GenFile(53209343, bytes((i + 5) for i in range(0, 64, 6)))
        lbry_file = yield create_lbry_file(self.blob_manager, self.storage, self.prm, self.lbry_file_manager,
                                           "test_file", test_file)
        sd_hash = yield self.storage.get_sd_blob_hash_for_stream(lbry_file.stream_hash)
        self.assertTrue(lbry_file.sd_hash, sd_hash)
        yield lbry_file.start()
        f = open('test_file', 'rb')
        hashsum = md5()
        hashsum.update(f.read())
        self.assertEqual(hashsum.hexdigest(), "68959747edc73df45e45db6379dd7b3b")