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# -*- coding: utf-8 -*-
"""
Display the current AWS bill.

##### WARNING #####
This module generate some costs on the AWS bill. Take care about the cache_timout to limit these fees !
##### WARNING #####

Configuration parameters:
    - aws_access_key_id : Your AWS access key
    - aws_secret_access_key : Your AWS secret key
    - aws_account_id : the root ID of the AWS account. Can be find here https://console.aws.amazon.com/billing/home#/account
    - s3_bucket_name : the bucket where billing files are sent by AWS. Follow this article to activate this feature : http://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/detailed-billing-reports.html
    - billing_file : where the billing file must be stored
    - cache_timeout : how often we refresh this module in seconds

@author nawadanp
"""

import csv
import datetime
import boto

from boto.s3.connection import Key
from time import time

class Py3status:

	# available configuration parameters
	aws_access_key_id = ''
	aws_secret_access_key = ''
	aws_account_id = ''
	s3_bucket_name = ''
	billing_file = '/tmp/.aws_billing.csv'
	cache_timeout = 3600

	def _get_bill_amount(self):
		# Billing file name, generated by Amazon itself
		# Format : 123456789012-aws-billing-csv-yyyy-mm.csv
		s3_file_key = self.aws_account_id + '-aws-billing-csv-' + datetime.datetime.now().strftime("%Y") + '-' + datetime.datetime.now().strftime("%m") + '.csv'
		i = 0

		# Connect to the bucket
		conn = boto.connect_s3(self.aws_access_key_id, self.aws_secret_access_key)
		bucket = conn.get_bucket(self.s3_bucket_name)
		
		# Fetch the objects keys and get the billing file
		k = Key(bucket)
		k.key = s3_file_key
		try:
			k.get_contents_to_filename(self.billing_file)
		except:
			return False
		k.close

		# Parse the file and get the InvoiceTotal amount
		with open(self.billing_file,'rb') as f:
		        reader = csv.reader(f)
		        for row in reader:
		                if ''.join(row).find('InvoiceTotal') == -1:
		                        continue
		                i = i+1
		                return row[-1]

		
	def aws_bill(self, i3s_output_list, i3s_config):
		response = {
            		'cached_until': time() + self.cache_timeout,
            		'full_text': ''
        	}

		bill_amount = self._get_bill_amount()

		if bill_amount:
			response['full_text'] = str(bill_amount) + "$"
			response['color'] = i3s_config['color_good']
		else:
			response['full_text'] = "Billing file not found in the bucket"
			response['color'] = i3s_config['color_bad']
		
		return response 


if __name__ == "__main__":
	"""
	Test this module by calling it directly.
	"""
	from time import sleep
	x = Py3status()
	config = {
		'color_good': '#00FF00',
		'color_bad': '#FF0000',
	}
	while True:
		print(x.aws_bill([], config))
		sleep(1)