#!/usr/bin/env python
"""
This program is to collect some AWS stuff 
"""
import boto3
import threading

from local_helpers.config import accounts_db 
from local_helpers import assume_role, get_session, misc 
from local_helpers import ec2_helper

if __name__ == "__main__":
    """main"""

    """bucket to hold results"""
    output_bucket = []

    """get list of available regions"""
    regions = get_session.regions()

    if regions:
       """generate output header"""
       output_bucket.append(ec2_helper.describe_images_header())

       """go through each account and traverse each region"""
       """------------------------------------------------"""
       multi_thread = []

       """get tuple: account -> dict:, temp role creds -> dict:"""
       for account in accounts_db.accounts:
           """get temp creds from trusting roles"""
           role = assume_role.new_role(account)

           if role:
               for region in regions.get('Regions'):

                   """make an ec2 type client connection"""
                   ec2 = get_session.connect(
                   role, 
                   'ec2', 
                   region_name=region.get('RegionName'))

                   """
                   call ec2.describe_instances() in multithreading mode 
                   for better performance. otherwise performance sucks.
                   """
                   thread_call = threading.Thread(
                        target=ec2_helper.describe_images, 
                        args=(ec2, account, region, output_bucket))
                   multi_thread.append(thread_call)
                   thread_call.start()

       """wait for all threads to finish"""
       for t in multi_thread:
           t.join()

       """output or export results"""
       if output_bucket:
           misc.output_lines(output_bucket)










