# Server & communication implementation
###### tags: `Semester2`

## Branches

## Initialize server

### Variabelen
* lijst van schermen
* state: "free", "CatCaster"
* lijst van game objecten
* lijst van controllers, die allemaal tot exact een game horen
* elk game object heeft een lijst schermen en een lijst controllers

### Connections
The server is connected to all clients (screens and controllers) via web sockets.
D8: all screens are connected via WebRTC with each other (is dat echt nodig?): nadat de foto werd geanaliseerd, alle schermen krijgen een lijst van naburige schermen en connecteren met die.

### Routes VEROUDERD - NOT UP TO DATE
When typing the url in the browser
* GET `catcaster/team-02/scherm` : maken van een scherm (moet "/screen" zijn volgens opgave)
* initialize een scherm
* make an unique ID (hexadecimal with unique first characters)
* add scherm to lijst van schermen with state "free"
* make a websocket between scherm and server
* krijgt een QR-code terug (node-qrcode https://github.com/soldair/node-qrcode), deze qr code bevat de url `catcaster/team-02/controller/schermID`

When scanning a QR-code from a screen
* GET `catcaster/team-02/controller/schermID` : maken van een controller (moet eigenlijk "/screen/{shortScreenID}" zijn volgens [S2] in opgave)
* initialize een controller
* add controller to lijst van controllers
* add the screen ID as an attribute of the controller
* make a websocket between scherm and server
* if the screen is already in a game
* add a cat to the scherm
* initialize all webRTC between the new controller and all the screens
* if the screen isn't already in a game
* display the choice between single- and multi-screen
* ...
* [S9]: server changes screenmode via websocket

When clicking on single-screen
* PUT `catcaster/team-02/controller/schermID/single` :
* append the game array with a new game object
* add the screen to the game
* add the controller to the game
* change the status of the screen to "CatCaster"
* initialize all webRTC between the controller and all the screen
* make a websocket between screen and server

When clicking on multi-screen
* PUT `catcaster/team-02/controller/schermID/multi` :
* request a picture of the display
* append the game array with a new game object
* add the screens to the game
* add the controller to the game
* change the status of the screens to "CatCaster"
* initialize all webRTC between the controllers and all the screens
* make websockets between screens and server

### Interesting links
- https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API
==> socket.IO gebruiken ??
- https://socket.io/docs/v4/

# TODO
- [ ] https (Karam)
- [ ] WebRTC!
- [ ] signaling-server
- [ ] mergen met rest... QR