conceptual decisions and future work

[ghostbuster91]

There are couple of things which should be discussed, in order to move forward with implementation without doubts:

$1
How should we implement the contact / conversation list?
Propositions:

1. As a list of conversations in repository
2. As a list of contacts in repository
   Possible problem: We have to put some fake entry into conversation repository right after conversation has been started in case when user exit conversation before sending any message.

$2
We will eventually add some invitation mechanism to allow users to accept or decline invitations (by invitation I mean pending_request). This will add additional complexity to android service which will have to filter out messages from users whose invitations weren't accepted. Also we will probably need some place to store declined invitations to know which messages should be filtered out in service. It might be stored locally. Or maybe we shouldn't allowing users to send messages until invitation has been accepted. We have to decide if it should be possible to resend invitation after it was rejected.

$3
Android service for sending notifications from background.
For now I have only one idea when to send notifications to the user which is to wait some amount of time e.g. 5 seconds and if message hasn't been changed to read during that time, send this message as notification.