#!/usr/bin/env python
# encoding: utf-8

__docformat__ = "restructuredtext en"

#-------------------------------------------------------------------------------
#  Copyright (C) 2008  The IPython Development Team
#
#  Distributed under the terms of the BSD License.  The full license is in
#  the file COPYING, distributed as part of this software.
#-------------------------------------------------------------------------------

#-------------------------------------------------------------------------------
# Imports
#-------------------------------------------------------------------------------

# Tell nose to skip this module
__test__ = {}

import time

from twisted.internet import defer, reactor

from IPython.kernel.fcutil import Tub, UnauthenticatedTub

from IPython.kernel import task as taskmodule
from IPython.kernel import controllerservice as cs
import IPython.kernel.multiengine as me
from IPython.testing.util import DeferredTestCase
from IPython.kernel.multienginefc import IFCSynchronousMultiEngine
from IPython.kernel.taskfc import IFCTaskController
from IPython.kernel.util import printer
from IPython.kernel.tests.tasktest import ITaskControllerTestCase
from IPython.kernel.clientconnector import AsyncClientConnector
from IPython.kernel.error import CompositeError
from IPython.kernel.parallelfunction import ParallelFunction


#-------------------------------------------------------------------------------
# Tests
#-------------------------------------------------------------------------------

def _raise_it(f):
    try:
        f.raiseException()
    except CompositeError, e:
        e.raise_exception()

class TaskTest(DeferredTestCase, ITaskControllerTestCase):

    def setUp(self):

        self.engines = []

        self.controller = cs.ControllerService()
        self.controller.startService()
        self.imultiengine = me.IMultiEngine(self.controller)
        self.itc = taskmodule.ITaskController(self.controller)
        self.itc.failurePenalty = 0

        self.mec_referenceable = IFCSynchronousMultiEngine(self.imultiengine)
        self.tc_referenceable = IFCTaskController(self.itc)

        self.controller_tub = Tub()
        self.controller_tub.listenOn('tcp:10111:interface=127.0.0.1')
        self.controller_tub.setLocation('127.0.0.1:10111')

        mec_furl = self.controller_tub.registerReference(self.mec_referenceable)
        tc_furl = self.controller_tub.registerReference(self.tc_referenceable)
        self.controller_tub.startService()

        self.client_tub = AsyncClientConnector()
        d = self.client_tub.get_multiengine_client(furl_or_file=mec_furl)
        d.addCallback(self.handle_mec_client)
        d.addCallback(lambda _: self.client_tub.get_task_client(furl_or_file=tc_furl))
        d.addCallback(self.handle_tc_client)
        return d

    def handle_mec_client(self, client):
        self.multiengine = client

    def handle_tc_client(self, client):
        self.tc = client

    def tearDown(self):
        dlist = []
        # Shut down the multiengine client
        d = self.client_tub.tub.stopService()
        dlist.append(d)
        # Shut down the engines
        for e in self.engines:
            e.stopService()
        # Shut down the controller
        d = self.controller_tub.stopService()
        d.addBoth(lambda _: self.controller.stopService())
        dlist.append(d)
        return defer.DeferredList(dlist)

    def test_mapper(self):
        self.addEngine(1)
        m = self.tc.mapper()
        self.assertEquals(m.task_controller,self.tc)
        self.assertEquals(m.clear_before,False)
        self.assertEquals(m.clear_after,False)
        self.assertEquals(m.retries,0)
        self.assertEquals(m.recovery_task,None)
        self.assertEquals(m.depend,None)
        self.assertEquals(m.block,True)

    def test_map_default(self):
        self.addEngine(1)
        m = self.tc.mapper()
        d = m.map(lambda x: 2*x, range(10))
        d.addCallback(lambda r: self.assertEquals(r,[2*x for x in range(10)]))
        d.addCallback(lambda _: self.tc.map(lambda x: 2*x, range(10)))
        d.addCallback(lambda r: self.assertEquals(r,[2*x for x in range(10)]))
        return d

    def test_map_noblock(self):
        self.addEngine(1)
        m = self.tc.mapper(block=False)
        d = m.map(lambda x: 2*x, range(10))
        d.addCallback(lambda r: self.assertEquals(r,[x for x in range(10)]))
        return d

    def test_mapper_fail(self):
        self.addEngine(1)
        m = self.tc.mapper()
        d = m.map(lambda x: 1/0, range(10))
        d.addBoth(lambda f: self.assertRaises(ZeroDivisionError, _raise_it, f))
        return d

    def test_parallel(self):
        self.addEngine(1)
        p = self.tc.parallel()
        self.assert_(isinstance(p, ParallelFunction))
        @p
        def f(x): return 2*x
        d = f(range(10))
        d.addCallback(lambda r: self.assertEquals(r,[2*x for x in range(10)]))
        return d

    def test_parallel_noblock(self):
        self.addEngine(1)
        p = self.tc.parallel(block=False)
        self.assert_(isinstance(p, ParallelFunction))
        @p
        def f(x): return 2*x
        d = f(range(10))
        d.addCallback(lambda r: self.assertEquals(r,[x for x in range(10)]))
        return d

    def test_parallel_fail(self):
        self.addEngine(1)
        p = self.tc.parallel()
        self.assert_(isinstance(p, ParallelFunction))
        @p
        def f(x): return 1/0
        d = f(range(10))
        d.addBoth(lambda f: self.assertRaises(ZeroDivisionError, _raise_it, f))
        return d