import os
import uuid
import zmq

from zmq.tests import BaseZMQTestCase
from zmq.eventloop.zmqstream import ZMQStream
# from IPython.zmq.tests import SessionTestCase
from IPython.zmq.parallel import streamsession as ss

class SessionTestCase(BaseZMQTestCase):
    
    def setUp(self):
        BaseZMQTestCase.setUp(self)
        self.session = ss.StreamSession()

class TestSession(SessionTestCase):
    
    def test_msg(self):
        """message format"""
        msg = self.session.msg('execute')
        thekeys = set('header msg_id parent_header msg_type content'.split())
        s = set(msg.keys())
        self.assertEquals(s, thekeys)
        self.assertTrue(isinstance(msg['content'],dict))
        self.assertTrue(isinstance(msg['header'],dict))
        self.assertTrue(isinstance(msg['parent_header'],dict))
        self.assertEquals(msg['msg_type'], 'execute')
        
            
    
    def test_args(self):
        """initialization arguments for StreamSession"""
        s = self.session
        self.assertTrue(s.pack is ss.default_packer)
        self.assertTrue(s.unpack is ss.default_unpacker)
        self.assertEquals(s.username, os.environ.get('USER', 'username'))
        
        s = ss.StreamSession(username=None)
        self.assertEquals(s.username, os.environ.get('USER', 'username'))
        
        self.assertRaises(TypeError, ss.StreamSession, packer='hi')
        self.assertRaises(TypeError, ss.StreamSession, unpacker='hi')
        u = str(uuid.uuid4())
        s = ss.StreamSession(username='carrot', session=u)
        self.assertEquals(s.session, u)
        self.assertEquals(s.username, 'carrot')
        
    def test_tracking(self):
        """test tracking messages"""
        a,b = self.create_bound_pair(zmq.PAIR, zmq.PAIR)
        s = self.session
        stream = ZMQStream(a)
        msg = s.send(a, 'hello', track=False)
        self.assertTrue(msg['tracker'] is None)
        msg = s.send(a, 'hello', track=True)
        self.assertTrue(isinstance(msg['tracker'], zmq.MessageTracker))
        M = zmq.Message(b'hi there', track=True)
        msg = s.send(a, 'hello', buffers=[M], track=True)
        t = msg['tracker']
        self.assertTrue(isinstance(t, zmq.MessageTracker))
        self.assertRaises(zmq.NotDone, t.wait, .1)
        del M
        t.wait(1) # this will raise
        
        
    # def test_rekey(self):
    #     """rekeying dict around json str keys"""
    #     d = {'0': uuid.uuid4(), 0:uuid.uuid4()}
    #     self.assertRaises(KeyError, ss.rekey, d)
    #     
    #     d = {'0': uuid.uuid4(), 1:uuid.uuid4(), 'asdf':uuid.uuid4()}
    #     d2 = {0:d['0'],1:d[1],'asdf':d['asdf']}
    #     rd = ss.rekey(d)
    #     self.assertEquals(d2,rd)
    #     
    #     d = {'1.5':uuid.uuid4(),'1':uuid.uuid4()}
    #     d2 = {1.5:d['1.5'],1:d['1']}
    #     rd = ss.rekey(d)
    #     self.assertEquals(d2,rd)
    #     
    #     d = {'1.0':uuid.uuid4(),'1':uuid.uuid4()}
    #     self.assertRaises(KeyError, ss.rekey, d)
    # 
    def test_unique_msg_ids(self):
        """test that messages receive unique ids"""
        ids = set()
        for i in range(2**12):
            h = self.session.msg_header('test')
            msg_id = h['msg_id']
            self.assertTrue(msg_id not in ids)
            ids.add(msg_id)
    
    def test_feed_identities(self):
        """scrub the front for zmq IDENTITIES"""
        theids = "engine client other".split()
        content = dict(code='whoda',stuff=object())
        themsg = self.session.msg('execute',content=content)
        pmsg = theids