Puppet users - Apr 2014 - How to use facter variable in node definition?

Hi,
I want to use facter scope variable to use in my manifest files for puppet

for now i have something like this:

node 'web-server' {
..
..
}


I want to be able to use if/case  definition to define nodes


root@ip-10-187-40-216:~# facter -p system_role
app-server
root@ip-10-187-40-216:~#

so in my manifest node definition i would like to use something like:

node if $::system_role == "app-server" {
..
...
include default;
}


or something similar to it.
I want to use facter variables because i want to use with ec2tags for each 
server and build each server based on ec2 tag

How I can approach this?

thanks

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