Use methods provided in vk_api for supporting conversations

src/controller/buffers.py

@@ -611,6 +611,7 @@ class empty(object):
 	def remove_buffer(self, mandatory=False): return False
 
 class chatBuffer(baseBuffer):
+	random_id = 1
 
 	def insert(self, item, reversed=False):
 		""" Add a new item to the list. Uses session.composefunc for parsing the dictionary and create a valid result for putting it in the list."""
@@ -706,11 +707,15 @@ class chatBuffer(baseBuffer):
 
 	def _send_message(self, text):
 #		try:
+		# Let's take care about the random_id attribute.
+		# This should be unique per message and should be changed right after the message has been sent.
+		# If the message is tried to be sent twice this random_id should be the same for both copies.
+		# At the moment we just calculate len(text)_user_id, hope that will work.
+		random_id = "{0}_{1}".format(len(text), self.kwargs["user_id"])
 		if hasattr(self, "attachments_to_be_sent"):
-			response = self.session.vk.client.messages.send(user_id=self.kwargs["user_id"], message=text, attachment=self.attachments_to_be_sent)
-			print self.attachments_to_be_sent
+			response = self.session.vk.client.messages.send(user_id=self.kwargs["user_id"], message=text, attachment=self.attachments_to_be_sent, random_id=random_id)
 		else:
-			response = self.session.vk.client.messages.send(user_id=self.kwargs["user_id"], message=text)
+			response = self.session.vk.client.messages.send(user_id=self.kwargs["user_id"], message=text, random_id=random_id)
 #		except VkAPIMethodError as ex:
 #			if ex.code == 9:
 #				output.speak(_(u"You have been sending a message that is already sent. Try to update the buffer if you can't see the new message in the history."))