import types
import mock
from twisted.trial import unittest
from twisted.internet import defer, task

from lbrynet.core import Session, PaymentRateManager, Wallet
from lbrynet.core.Error import DownloadDataTimeout, DownloadSDTimeout
from lbrynet.daemon import Downloader
from lbrynet.core.StreamDescriptor import StreamDescriptorIdentifier

from lbrynet.file_manager.EncryptedFileStatusReport import EncryptedFileStatusReport
from lbrynet.file_manager.EncryptedFileDownloader import ManagedEncryptedFileDownloader
from lbrynet.daemon.ExchangeRateManager import ExchangeRateManager

from lbrynet.tests.mocks import ExchangeRateManager as DummyExchangeRateManager
from lbrynet.tests.mocks import mock_conf_settings


class MocDownloader(object):
    def __init__(self):
        self.finish_deferred = defer.Deferred(None)
        self.stop_called = False

        self.name = 'test'
        self.num_completed = 0
        self.num_known = 1
        self.running_status = ManagedEncryptedFileDownloader.STATUS_RUNNING

    @defer.inlineCallbacks
    def status(self):
        out = yield EncryptedFileStatusReport(
            self.name, self.num_completed, self.num_known, self.running_status)
        defer.returnValue(out)

    def start(self):
        return self.finish_deferred

    def stop(self):
        self.stop_called = True
        self.finish_deferred.callback(True)

def moc_initialize(self, stream_info):
    self.sd_hash = "d5169241150022f996fa7cd6a9a1c421937276a3275eb912" \
                   "790bd07ba7aec1fac5fd45431d226b8fb402691e79aeb24b"
    return None

def moc_download_sd_blob(self):
    return None

def moc_download(self, sd_blob, name, key_fee):
    self.pay_key_fee(key_fee, name)
    self.downloader = MocDownloader()
    self.downloader.start()

def moc_pay_key_fee(self, key_fee, name):
    self.pay_key_fee_called = True

class GetStreamTests(unittest.TestCase):

    def init_getstream_with_mocs(self):
        mock_conf_settings(self)

        sd_identifier = mock.Mock(spec=StreamDescriptorIdentifier)
        session = mock.Mock(spec=Session.Session)
        session.wallet = mock.Mock(spec=Wallet.LBRYumWallet)
        prm = mock.Mock(spec=PaymentRateManager.NegotiatedPaymentRateManager)
        session.payment_rate_manager = prm
        market_feeds = []
        rates = {}
        exchange_rate_manager = DummyExchangeRateManager(market_feeds, rates)
        exchange_rate_manager = mock.Mock(spec=ExchangeRateManager)
        max_key_fee = {'currency':"LBC", 'amount':10, 'address':''}
        disable_max_key_fee = False
        data_rate = {'currency':"LBC", 'amount':0, 'address':''}

        getstream = Downloader.GetStream(sd_identifier, session,
            exchange_rate_manager, max_key_fee, disable_max_key_fee, timeout=3, data_rate=data_rate)
        getstream.pay_key_fee_called = False

        self.clock = task.Clock()
        getstream.checker.clock = self.clock
        return getstream

    @defer.inlineCallbacks
    def test_init_exception(self):
        """
        test that if initialization would fail, by giving it invaild
        stream_info, that an exception is thrown
        """

        getstream = self.init_getstream_with_mocs()
        name = 'test'
        stream_info = None

        with self.assertRaises(AttributeError):
            yield getstream.start(stream_info, name)


    @defer.inlineCallbacks
    def test_sd_blob_download_timeout(self):
        """
        test that if download_sd_blob fails due to timeout,
        DownloadTimeoutError is raised
        """
        def download_sd_blob(self):
            raise DownloadSDTimeout(self)

        getstream = self.init_getstream_with_mocs()
        getstream._initialize = types.MethodType(moc_initialize, getstream)
        getstream._download_sd_blob = types.MethodType(download_sd_blob, getstream)
        getstream._download = types.MethodType(moc_download, getstream)
        getstream.pay_key_fee = types.MethodType(moc_pay_key_fee, getstream)
        name = 'test'
        stream_info = None
        with self.assertRaises(DownloadSDTimeout):
            yield getstream.start(stream_info, name)
        self.assertFalse(getstream.pay_key_fee_called)

    @defer.inlineCallbacks
    def test_timeout(self):
        """
        test that timeout (set to 3 here) exception is raised
        when download times out while downloading first blob, and key fee is paid
        """
        getstream = self.init_getstream_with_mocs()
        getstream._initialize = types.MethodType(moc_initialize, getstream)
        getstream._download_sd_blob = types.MethodType(moc_download_sd_blob, getstream)
        getstream._download = types.MethodType(moc_download, getstream)
        getstream.pay_key_fee = types.MethodType(moc_pay_key_fee, getstream)
        name = 'test'
        stream_info = None
        start = getstream.start(stream_info, name)
        self.clock.advance(1)
        self.clock.advance(1)
        self.clock.advance(1)
        with self.assertRaises(DownloadDataTimeout):
            yield start
        self.assertTrue(getstream.pay_key_fee_called)

    @defer.inlineCallbacks
    def test_finish_one_blob(self):
        """
        test that if we have 1 completed blob, start() returns
        and key fee is paid
        """
        getstream = self.init_getstream_with_mocs()
        getstream._initialize = types.MethodType(moc_initialize, getstream)

        getstream._download_sd_blob = types.MethodType(moc_download_sd_blob, getstream)
        getstream._download = types.MethodType(moc_download, getstream)
        getstream.pay_key_fee = types.MethodType(moc_pay_key_fee, getstream)
        name = 'test'
        stream_info = None
        start = getstream.start(stream_info, name)

        getstream.downloader.num_completed = 1
        self.clock.advance(1)

        downloader, f_deferred = yield start
        self.assertTrue(getstream.pay_key_fee_called)

    # @defer.inlineCallbacks
    # def test_finish_stopped_downloader(self):
    #     """
    #     test that if we have a stopped downloader, beforfe a blob is downloaded,
    #     start() returns
    #     """
    #     getstream  = self.init_getstream_with_mocs()
    #     getstream._initialize = types.MethodType(moc_initialize, getstream)
    #     getstream._download_sd_blob = types.MethodType(moc_download_sd_blob, getstream)
    #     getstream._download = types.MethodType(moc_download, getstream)
    #     name='test'
    #     stream_info = None
    #     start = getstream.start(stream_info,name)
    #
    #     getstream.downloader.running_status = ManagedEncryptedFileDownloader.STATUS_STOPPED
    #     self.clock.advance(1)
    #     downloader, f_deferred = yield start