#!/bin/env python

import os, sys, logging, threading, time, string
from sqlalchemy import *
import subprocess
import re
from pprint import *

## needed to sort complex data structures
from operator import itemgetter, attrgetter

def _get_apps_ACL () :
   """
   Gets the apps ACLs per user
   """

   apps = {}
   userlist = []

   f=open('../external_dbs/acl_applications.txt', 'r')
   for line in f :
        (appname, users) = line.split("##")
        appname = appname.rstrip()
        appname = appname.lstrip()
        users = users.rstrip()
        users = users.lstrip()
        userlist = users.split(',')
        apps[appname] = userlist
   
   f.close()
   return apps

def get_apps_to_display ( all_apps_from_tool_conf, user_email) :
   """
   Filters the apps ACLs for the logged user
   """

   acl_apps = _get_apps_ACL() 
   to_display = []

   for app in all_apps_from_tool_conf :
        if app in acl_apps.keys() :

            ## ALL open app : check app's permissions
            if "ALL" in acl_apps[app]  :

                   ## app -  open to ALL (no users listed after ALL)
                   if len(acl_apps[app]) == 1 :
                        to_display.append(app)
                        
                   ## check if there are still some listed users who don't have permission to use the app despite of allowed ALL 
                   elif len(acl_apps[app]) > 1 :
                        if user_email in acl_apps[app] :
                             continue
                        else :
                             to_display.append(app)
                             
            ## restricted app
            ## check if the user is authorised for this restricted app
            elif user_email in acl_apps[app] :
                   to_display.append(app)
            ## skip if not authorised
            else :
                   continue
        else :
             print "The ACLs for the application <<< %s >>> have not been set. Please add it to the file /home/galaxy/externaldb/acl_applications.txt!! " % app
   
   return to_display