###############################################################################
##
##  Copyright (C) 2014 Tavendo GmbH
##
##  Licensed under the Apache License, Version 2.0 (the "License");
##  you may not use this file except in compliance with the License.
##  You may obtain a copy of the License at
##
##      http://www.apache.org/licenses/LICENSE-2.0
##
##  Unless required by applicable law or agreed to in writing, software
##  distributed under the License is distributed on an "AS IS" BASIS,
##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
##  See the License for the specific language governing permissions and
##  limitations under the License.
##
###############################################################################

from __future__ import absolute_import

from twisted.trial import unittest
#import unittest

#from autobahn import wamp2 as wamp
from autobahn import wamp
from autobahn.wamp.uri import Pattern



class TestUris(unittest.TestCase):

   def setUp(self):
      pass

   def tearDown(self):
      pass

   def test_invalid_uris(self):
      for u in [u"",
                u"123",
                u"com.myapp.<product:foo>.update",
                u"com.myapp.<123:int>.update",
                u"com.myapp.<:product>.update",
                u"com.myapp.<product:>.update",
                u"com.myapp.<int:>.update",
                ]:
         self.assertRaises(Exception, Pattern, u, Pattern.URI_TARGET_ENDPOINT)

   def test_valid_uris(self):
      for u in [u"com.myapp.proc1",
                u"com.myapp.<product:int>.update",
                ]:
         p = Pattern(u, Pattern.URI_TARGET_ENDPOINT)
         self.assertIsInstance(p, Pattern)

   def test_parse_uris(self):
      tests = [
         (u"com.myapp.<product:int>.update", [
            (u"com.myapp.0.update", {u'product': 0}),
            (u"com.myapp.123456.update", {u'product': 123456}),
            (u"com.myapp.aaa.update", None),
            (u"com.myapp..update", None),
            (u"com.myapp.0.delete", None),
            ]
         ),
         (u"com.myapp.<product:string>.update", [
            (u"com.myapp.box.update", {u'product': u'box'}),
            (u"com.myapp.123456.update", {u'product': u'123456'}),
            (u"com.myapp..update", None),
            ]
         )
      ]
      for test in tests:
         pat = Pattern(test[0], Pattern.URI_TARGET_ENDPOINT)
         for ptest in test[1]:
            uri = ptest[0]
            kwargs_should = ptest[1]
            if kwargs_should is not None:
               args_is, kwargs_is = pat.match(uri)
               self.assertEqual(kwargs_is, kwargs_should)
            else:
               self.assertRaises(Exception, pat.match, uri)



class TestDecorators(unittest.TestCase):

   def test_decorate_endpoint(self):

      @wamp.procedure("com.calculator.square")
      def square(x):
         pass

      self.assertTrue(hasattr(square, '_wampuris'))
      self.assertTrue(type(square._wampuris) == list)
      self.assertEqual(len(square._wampuris), 1)
      self.assertIsInstance(square._wampuris[0], Pattern)
      self.assertTrue(square._wampuris[0].is_endpoint())
      self.assertFalse(square._wampuris[0].is_handler())
      self.assertFalse(square._wampuris[0].is_exception())
      self.assertEqual(square._wampuris[0].uri(), "com.calculator.square")
      self.assertEqual(square._wampuris[0]._type, Pattern.URI_TYPE_EXACT)

      @wamp.procedure("com.myapp.product.<product:int>.update")
      def update_product(product = None, label = None):
         pass

      self.assertTrue(hasattr(update_product, '_wampuris'))
      self.assertTrue(type(update_product._wampuris) == list)
      self.assertEqual(len(update_product._wampuris), 1)
      self.assertIsInstance(update_product._wampuris[0], Pattern)
      self.assertTrue(update_product._wampuris[0].is_endpoint())
      self.assertFalse(update_product._wampuris[0].is_handler())
      self.assertFalse(update_product._wampuris[0].is_exception())
      self.assertEqual(update_product._wampuris[0].uri(), "com.myapp.product.<product:int>.update")
      self.assertEqual(update_product._wampuris[0]._type, Pattern.URI_TYPE_WILDCARD)

      @wamp.procedure("com.myapp.<category:string>.<id:int>.update")
      def update(category = None, id = None):
         pass

      self.assertTrue(hasattr(update, '_wampuris'))
      self.assertTrue(type(update._wampuris) == list)
      self.assertEqual(len(update._wampuris), 1)
      self.assertIsInstance(update._wampuris[0], Pattern)
      self.assertTrue(update._wampuris[0].is_endpoint())
      self.assertFalse(update._wampuris[0].is_handler())
      self.assertFalse(update._wampuris[0].is_exception())
      self.assertEqual(update._wampuris[0].uri(), "com.myapp.<category:string>.<id:int>.update")
      self.assertEqual(update._wampuris[0]._type, Pattern.URI_TYPE_WILDCARD)


   def test_decorate_handler(self):

      @wamp.topic("com.myapp.on_shutdown")
      def on_shutdown():
         pass

      self.assertTrue(hasattr(on_shutdown, '_wampuris'))
      self.assertTrue(type(on_shutdown._wampuris) == list)
      self.assertEqual(len(on_shutdown._wampuris), 1)
      self.assertIsInstance(on_shutdown._wampuris[0], Pattern)
      self.assertFalse(on_shutdown._wampuris[0].is_endpoint())
      self.assertTrue(on_shutdown._wampuris[0].is_handler())
      self.assertFalse(on_shutdown._wampuris[0].is_exception())
      self.assertEqual(on_shutdown._wampuris[0].uri(), "com.myapp.on_shutdown")
      self.assertEqual(on_shutdown._wampuris[0]._type, Pattern.URI_TYPE_EXACT)

      @wamp.topic("com.myapp.product.<product:int>.on_update")
      def on_product_update(product = None, label = None):
         pass

      self.assertTrue(hasattr(on_product_update, '_wampuris'))
      self.assertTrue(type(on_product_update._wampuris) == list)
      self.assertEqual(len(on_product_update._wampuris), 1)
      self.assertIsInstance(on_product_update._wampuris[0], Pattern)
      self.assertFalse(on_product_update._wampuris[0].is_endpoint())
      self.assertTrue(on_product_update._wampuris[0].is_handler())
      self.assertFalse(on_product_update._wampuris[0].is_exception())
      self.assertEqual(on_product_update._wampuris[0].uri(), "com.myapp.product.<product:int>.on_update")
      self.assertEqual(on_product_update._wampuris[0]._type, Pattern.URI_TYPE_WILDCARD)

      @wamp.topic("com.myapp.<category:string>.<id:int>.on_update")
      def on_update(category = None, id = None, label = None):
         pass

      self.assertTrue(hasattr(on_update, '_wampuris'))
      self.assertTrue(type(on_update._wampuris) == list)
      self.assertEqual(len(on_update._wampuris), 1)
      self.assertIsInstance(on_update._wampuris[0], Pattern)
      self.assertFalse(on_update._wampuris[0].is_endpoint())
      self.assertTrue(on_update._wampuris[0].is_handler())
      self.assertFalse(on_update._wampuris[0].is_exception())
      self.assertEqual(on_update._wampuris[0].uri(), "com.myapp.<category:string>.<id:int>.on_update")
      self.assertEqual(on_update._wampuris[0]._type, Pattern.URI_TYPE_WILDCARD)


   def test_decorate_exception(self):

      @wamp.error("com.myapp.error")
      class AppError(Exception):
         pass

      self.assertTrue(hasattr(AppError, '_wampuris'))
      self.assertTrue(type(AppError._wampuris) == list)
      self.assertEqual(len(AppError._wampuris), 1)
      self.assertIsInstance(AppError._wampuris[0], Pattern)
      self.assertFalse(AppError._wampuris[0].is_endpoint())
      self.assertFalse(AppError._wampuris[0].is_handler())
      self.assertTrue(AppError._wampuris[0].is_exception())
      self.assertEqual(AppError._wampuris[0].uri(), "com.myapp.error")
      self.assertEqual(AppError._wampuris[0]._type, Pattern.URI_TYPE_EXACT)

      @wamp.error("com.myapp.product.<product:int>.product_inactive")
      class ProductInactiveError(Exception):
         pass

      self.assertTrue(hasattr(ProductInactiveError, '_wampuris'))
      self.assertTrue(type(ProductInactiveError._wampuris) == list)
      self.assertEqual(len(ProductInactiveError._wampuris), 1)
      self.assertIsInstance(ProductInactiveError._wampuris[0], Pattern)
      self.assertFalse(ProductInactiveError._wampuris[0].is_endpoint())
      self.assertFalse(ProductInactiveError._wampuris[0].is_handler())
      self.assertTrue(ProductInactiveError._wampuris[0].is_exception())
      self.assertEqual(ProductInactiveError._wampuris[0].uri(), "com.myapp.product.<product:int>.product_inactive")
      self.assertEqual(ProductInactiveError._wampuris[0]._type, Pattern.URI_TYPE_WILDCARD)

      @wamp.error("com.myapp.<category:string>.<product:int>.inactive")
      class ObjectInactiveError(Exception):
         pass

      self.assertTrue(hasattr(ObjectInactiveError, '_wampuris'))
      self.assertTrue(type(ObjectInactiveError._wampuris) == list)
      self.assertEqual(len(ObjectInactiveError._wampuris), 1)
      self.assertIsInstance(ObjectInactiveError._wampuris[0], Pattern)
      self.assertFalse(ObjectInactiveError._wampuris[0].is_endpoint())
      self.assertFalse(ObjectInactiveError._wampuris[0].is_handler())
      self.assertTrue(ObjectInactiveError._wampuris[0].is_exception())
      self.assertEqual(ObjectInactiveError._wampuris[0].uri(), "com.myapp.<category:string>.<product:int>.inactive")
      self.assertEqual(ObjectInactiveError._wampuris[0]._type, Pattern.URI_TYPE_WILDCARD)


   def test_match_decorated_endpoint(self):

      @wamp.procedure("com.calculator.square")
      def square(x):
         return x

      args, kwargs = square._wampuris[0].match("com.calculator.square")
      self.assertEqual(square(666, **kwargs), 666)

      @wamp.procedure("com.myapp.product.<product:int>.update")
      def update_product(product = None, label = None):
         return product, label

      args, kwargs = update_product._wampuris[0].match("com.myapp.product.123456.update")
      kwargs['label'] = "foobar"
      self.assertEqual(update_product(**kwargs), (123456, "foobar"))

      @wamp.procedure("com.myapp.<category:string>.<id:int>.update")
      def update(category = None, id = None, label = None):
         return category, id, label

      args, kwargs = update._wampuris[0].match("com.myapp.product.123456.update")
      kwargs['label'] = "foobar"
      self.assertEqual(update(**kwargs), ("product", 123456, "foobar"))


   def test_match_decorated_handler(self):

      @wamp.topic("com.myapp.on_shutdown")
      def on_shutdown():
         pass

      args, kwargs = on_shutdown._wampuris[0].match("com.myapp.on_shutdown")
      self.assertEqual(on_shutdown(**kwargs), None)

      @wamp.topic("com.myapp.product.<product:int>.on_update")
      def on_product_update(product = None, label = None):
         return product, label

      args, kwargs = on_product_update._wampuris[0].match("com.myapp.product.123456.on_update")
      kwargs['label'] = "foobar"
      self.assertEqual(on_product_update(**kwargs), (123456, "foobar"))

      @wamp.topic("com.myapp.<category:string>.<id:int>.on_update")
      def on_update(category = None, id = None, label = None):
         return category, id, label

      args, kwargs = on_update._wampuris[0].match("com.myapp.product.123456.on_update")
      kwargs['label'] = "foobar"
      self.assertEqual(on_update(**kwargs), ("product", 123456, "foobar"))


   def test_match_decorated_exception(self):

      @wamp.error("com.myapp.error")
      class AppError(Exception):

         def __init__(self, msg):
            Exception.__init__(self, msg)

         def __eq__(self, other):
            return self.__class__ == other.__class__ and \
                   self.args == other.args

      args, kwargs = AppError._wampuris[0].match("com.myapp.error")
      self.assertEqual(AppError("fuck", **kwargs), AppError("fuck"))


      @wamp.error("com.myapp.product.<product:int>.product_inactive")
      class ProductInactiveError(Exception):

         def __init__(self, msg, product = None):
            Exception.__init__(self, msg)
            self.product = product

         def __eq__(self, other):
            return self.__class__ == other.__class__ and \
                   self.args == other.args and \
                   self.product == other.product

      args, kwargs = ProductInactiveError._wampuris[0].match("com.myapp.product.123456.product_inactive")
      self.assertEqual(ProductInactiveError("fuck", **kwargs), ProductInactiveError("fuck", 123456))


      @wamp.error("com.myapp.<category:string>.<product:int>.inactive")
      class ObjectInactiveError(Exception):

         def __init__(self, msg, category = None, product = None):
            Exception.__init__(self, msg)
            self.category = category
            self.product = product

         def __eq__(self, other):
            return self.__class__ == other.__class__ and \
                   self.args == other.args and \
                   self.category == other.category and \
                   self.product == other.product

      args, kwargs = ObjectInactiveError._wampuris[0].match("com.myapp.product.123456.inactive")
      self.assertEqual(ObjectInactiveError("fuck", **kwargs), ObjectInactiveError("fuck", "product", 123456))



class KwException(Exception):
   def __init__(self, *args, **kwargs):
      Exception.__init__(self, *args)
      self.kwargs = kwargs

# what if the WAMP error message received
# contains args/kwargs that cannot be
# consumed by the constructor of the exception
# class defined for the WAMP error URI?

# 1. we can bail out (but we are already signaling an error)
# 2. we can require a generic constructor
# 3. we can map only unconsumed args/kwargs to generic attributes
# 4. we can silently drop unconsumed args/kwargs


def getargs(fun):
   try:
      argspec = inspect.getargspec(fun)
   except:
      if fun == Exception.__init__:
         # `inspect.getargspec(Exception.__init__)` does work on PyPy, but not
         # on CPython, since `Exception.__init__` is C code in CPython that
         # cannot be reflected upon.
         argspec = inspect.ArgSpec(args = ['self'], varargs = 'args', keywords = None, defaults = None)
      else:
         raise Exception("could not inspect function {}".format(fun))

   args = argspec.args[:-len(argspec.defaults)]
   kwargs = argspec.args[-len(argspec.defaults):]

   return args, kwargs, argspec.varargs, argspec.keywords


class MockSession:

   def __init__(self):
      self._ecls_to_uri_pat = {}
      self._uri_to_ecls = {}


   def define(self, exception, error = None):
      if error is None:
         assert(hasattr(exception, '_wampuris'))
         self._ecls_to_uri_pat[exception] = exception._wampuris
         self._uri_to_ecls[exception._wampuris[0].uri()] = exception
      else:
         assert(not hasattr(exception, '_wampuris'))
         self._ecls_to_uri_pat[exception] = [Pattern(error, Pattern.URI_TARGET_HANDLER)]
         self._uri_to_ecls[error] = exception


   def map_error(self, error, args = [], kwargs = {}):

      # FIXME:
      # 1. map to ecls based on error URI wildcard/prefix
      # 2. extract additional args/kwargs from error URI

      if self._uri_to_ecls.has_key(error):
         ecls = self._uri_to_ecls[error]
         try:
            ## the following might fail, eg. TypeError when
            ## signature of exception constructor is incompatible
            ## with args/kwargs or when the exception constructor raises
            if kwargs:
               if args:
                  exc = ecls(*args, **kwargs)
               else:
                  exc = ecls(**kwargs)
            else:
               if args:
                  exc = ecls(*args)
               else:
                  exc = ecls()
         except Exception as e:
            ## FIXME: log e
            exc = KwException(error, *args, **kwargs)
      else:
         ## this never fails
         exc = KwException(error, *args, **kwargs)
      return exc



class TestDecoratorsAdvanced(unittest.TestCase):

   def test_decorate_exception_non_exception(self):

      def test():
         @wamp.error("com.test.error")
         class Foo:
            pass

      self.assertRaises(Exception, test)


   def test_decorate_endpoint_multiple(self):

      @wamp.procedure("com.oldapp.oldproc")
      @wamp.procedure("com.calculator.square")
      def square(x):
         pass

      self.assertTrue(hasattr(square, '_wampuris'))
      self.assertTrue(type(square._wampuris) == list)
      self.assertEqual(len(square._wampuris), 2)

      for i in range(2):
         self.assertIsInstance(square._wampuris[i], Pattern)
         self.assertTrue(square._wampuris[i].is_endpoint())
         self.assertFalse(square._wampuris[i].is_handler())
         self.assertFalse(square._wampuris[i].is_exception())
         self.assertEqual(square._wampuris[i]._type, Pattern.URI_TYPE_EXACT)

      self.assertEqual(square._wampuris[0].uri(), "com.calculator.square")
      self.assertEqual(square._wampuris[1].uri(), "com.oldapp.oldproc")


   def test_marshal_decorated_exception(self):

      @wamp.error("com.myapp.error")
      class AppError(Exception):
         pass

      try:
         raise AppError("fuck")
      except Exception as e:
         self.assertEqual(e._wampuris[0].uri(), "com.myapp.error")


      @wamp.error("com.myapp.product.<product:int>.product_inactive")
      class ProductInactiveError(Exception):

         def __init__(self, msg, product = None):
            Exception.__init__(self, msg)
            self.product = product

      try:
         raise ProductInactiveError("fuck", 123456)
      except Exception as e:
         self.assertEqual(e._wampuris[0].uri(), "com.myapp.product.<product:int>.product_inactive")

      class AppErrorUndecorated(Exception):
         pass

      session = MockSession()
      session.define(AppError)


   def test_define_exception_undecorated(self):

      session = MockSession()

      class AppError(Exception):
         pass

      ## defining an undecorated exception requires
      ## an URI to be provided
      self.assertRaises(Exception, session.define, AppError)

      session.define(AppError, u"com.myapp.error")

      exc = session.map_error(u"com.myapp.error")
      self.assertIsInstance(exc, AppError)


   def test_define_exception_decorated(self):

      session = MockSession()

      @wamp.error("com.myapp.error")
      class AppError(Exception):
         pass

      ## when defining a decorated exception
      ## an URI must not be provided
      self.assertRaises(Exception, session.define, AppError, "com.myapp.error")

      session.define(AppError)

      exc = session.map_error("com.myapp.error")
      self.assertIsInstance(exc, AppError)


   def test_map_exception_undefined(self):

      session = MockSession()

      exc = session.map_error("com.myapp.error")
      self.assertIsInstance(exc, Exception)


   def test_map_exception_args(self):

      session = MockSession()

      @wamp.error("com.myapp.error")
      class AppError(Exception):
         pass

      @wamp.error("com.myapp.error.product_inactive")
      class ProductInactiveError(Exception):
         def __init__(self, product = None):
            self.product = product

      ## define exceptions in mock session
      session.define(AppError)
      session.define(ProductInactiveError)

      for test in [
         #("com.myapp.foo.error", [], {}, KwException),
         ("com.myapp.error", [], {}, AppError),
         ("com.myapp.error", ["you are doing it wrong"], {}, AppError),
         ("com.myapp.error", ["you are doing it wrong", 1, 2, 3], {}, AppError),

         ("com.myapp.error.product_inactive", [], {}, ProductInactiveError),
         ("com.myapp.error.product_inactive", [], {"product": 123456}, ProductInactiveError),
         ]:
         error, args, kwargs, ecls = test
         exc = session.map_error(error, args, kwargs)

         self.assertIsInstance(exc, ecls)
         self.assertEqual(list(exc.args), args)



if __name__ == '__main__':
   unittest.main()
