import logging
import os
import shutil

from Crypto.Hash import MD5
from twisted.trial.unittest import TestCase
from twisted.internet import defer, threads

from lbrynet.conf import MIN_BLOB_DATA_PAYMENT_RATE
from lbrynet.lbryfile.EncryptedFileMetadataManager import TempEncryptedFileMetadataManager
from lbrynet.lbryfile.EncryptedFileMetadataManager import DBEncryptedFileMetadataManager
from lbrynet.lbryfilemanager.EncryptedFileManager import EncryptedFileManager
from lbrynet.core.Session import Session
from lbrynet.core.StreamDescriptor import StreamDescriptorIdentifier
from lbrynet.lbryfilemanager.EncryptedFileCreator import create_lbry_file
from lbrynet.lbryfile.client.EncryptedFileOptions import add_lbry_file_to_sd_identifier
from lbrynet.lbryfile.StreamDescriptor import get_sd_info
from lbrynet.core.PeerManager import PeerManager
from lbrynet.core.RateLimiter import DummyRateLimiter, RateLimiter

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):
    def setUp(self):
        self.session = None
        self.stream_info_manager = None
        self.lbry_file_manager = None
        self.addCleanup(self.take_down_env)
        self.is_generous = True

    def take_down_env(self):
        d = defer.succeed(True)
        if self.lbry_file_manager is not None:
            d.addCallback(lambda _: self.lbry_file_manager.stop())
        if self.session is not None:
            d.addCallback(lambda _: self.session.shut_down())
        if self.stream_info_manager is not None:
            d.addCallback(lambda _: self.stream_info_manager.stop())

        def delete_test_env():
            shutil.rmtree('client')
            if os.path.exists("test_file"):
                os.remove("test_file")

        d.addCallback(lambda _: threads.deferToThread(delete_test_env))
        return d

    def test_create_stream(self):
        wallet = FakeWallet()
        peer_manager = PeerManager()
        peer_finder = FakePeerFinder(5553, peer_manager, 2)
        hash_announcer = FakeAnnouncer()
        rate_limiter = DummyRateLimiter()
        sd_identifier = StreamDescriptorIdentifier()


        db_dir = "client"
        blob_dir = os.path.join(db_dir, "blobfiles")
        os.mkdir(db_dir)
        os.mkdir(blob_dir)

        self.session = Session(
            MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
            peer_finder=peer_finder, hash_announcer=hash_announcer,
            blob_dir=blob_dir, peer_port=5553,
            use_upnp=False, rate_limiter=rate_limiter, wallet=wallet,
            blob_tracker_class=DummyBlobAvailabilityTracker,
            is_generous=self.is_generous
        )

        self.stream_info_manager = TempEncryptedFileMetadataManager()

        self.lbry_file_manager = EncryptedFileManager(
            self.session, self.stream_info_manager, sd_identifier)

        d = self.session.setup()
        d.addCallback(lambda _: self.stream_info_manager.setup())
        d.addCallback(lambda _: add_lbry_file_to_sd_identifier(sd_identifier))
        d.addCallback(lambda _: self.lbry_file_manager.setup())

        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.lbry_file_manager.stream_info_manager, stream_hash, True)
            d.addCallback(verify_equal)
            return d

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

        def create_stream():
            test_file = GenFile(5209343, b''.join([chr(i + 3) for i in xrange(0, 64, 6)]))
            d = create_lbry_file(self.session, self.lbry_file_manager, "test_file", test_file,
                                 key="0123456701234567", iv_generator=iv_generator())
            return d

        d.addCallback(lambda _: create_stream())
        d.addCallback(verify_stream_descriptor_file)
        return d

    def test_create_and_combine_stream(self):
        wallet = FakeWallet()
        peer_manager = PeerManager()
        peer_finder = FakePeerFinder(5553, peer_manager, 2)
        hash_announcer = FakeAnnouncer()
        rate_limiter = DummyRateLimiter()
        sd_identifier = StreamDescriptorIdentifier()

        db_dir = "client"
        blob_dir = os.path.join(db_dir, "blobfiles")
        os.mkdir(db_dir)
        os.mkdir(blob_dir)

        self.session = Session(
            MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
            peer_finder=peer_finder, hash_announcer=hash_announcer,
            blob_dir=blob_dir, peer_port=5553,
            use_upnp=False, rate_limiter=rate_limiter, wallet=wallet,
            blob_tracker_class=DummyBlobAvailabilityTracker
        )

        self.stream_info_manager = DBEncryptedFileMetadataManager(self.session.db_dir)

        self.lbry_file_manager = EncryptedFileManager(
            self.session, self.stream_info_manager, sd_identifier)

        def start_lbry_file(lbry_file):
            logging.debug("Calling lbry_file.start()")
            d = lbry_file.start()
            return d

        def combine_stream(stream_hash):
            prm = self.session.payment_rate_manager
            d = self.lbry_file_manager.add_lbry_file(stream_hash, prm)
            d.addCallback(start_lbry_file)

            def check_md5_sum():
                f = open('test_file')
                hashsum = MD5.new()
                hashsum.update(f.read())
                self.assertEqual(hashsum.hexdigest(), "68959747edc73df45e45db6379dd7b3b")

            d.addCallback(lambda _: check_md5_sum())
            return d

        def create_stream():
            test_file = GenFile(53209343, b''.join([chr(i + 5) for i in xrange(0, 64, 6)]))
            return create_lbry_file(
                self.session, self.lbry_file_manager, "test_file", test_file,
                suggested_file_name="test_file")

        d = self.session.setup()
        d.addCallback(lambda _: self.stream_info_manager.setup())
        d.addCallback(lambda _: add_lbry_file_to_sd_identifier(sd_identifier))
        d.addCallback(lambda _: self.lbry_file_manager.setup())
        d.addCallback(lambda _: create_stream())
        d.addCallback(combine_stream)
        return d