View source for KTp/Components/Chat Window/Plugin API Draft

Making an API to create plugins for the chat window. 
These should be able to handle the following usecases: 
*Translator plugin - when messages are sent or received, it will translate them before they are displayed (or actually sent)
*Image Embed plugin - when a URL of an image is received, it will display the image under the text
*Grammar correction - a plugin that replaces "wont" with "won't" on messages to be sent
*Youtube embed - embeds a youtube video in a chat


The stakeholders (components) are as follows:
*UI - telepathy-kde-text-ui and chat-widget etc.
*Plugin Manager 
*Plugin
*Core (Telepathy)

<nowiki><I'll upload the diagram for how they interact later></nowiki>

The interactions between the components:
*Plugin Manager and Plugin 
**Process Message
**Return Message
**Initialize 
**Loading
**Destroy
**Send-Message //still not sure about this
*Plugin Manager and Ui
**Display Message
**Display Final Message
**Send New Message //to be processed BEFORE being sent
*Plugin Manager and Core
**New Message Received
**Send New Message

It will consist of the following classes
*Interface Class : ReceivingPlugin
**
**virtual methods:
***ProcessReceivedMessage(Message message);
**methods:
***PreProcessReceivedMessage(Message); maybe have method like this, which PluginManager will call, that will check that that message hasn't already been processed before calling ProcessReceivedMessage().

*Interface Class : SendingPlugin
**
*Plugin Manager - Every client that wants to use the plugin system will have a single, global, static instance of this. 
**signal: displayMessage(bool final);
**slot: processAndSendNewMessage(QString message);
**slot: processReceivedMessage(Tp::Message message);
**QList<SendingPlugin>
**QList<ReceivingPlugin>
**