#!/usr/bin/python
# -*- coding: utf-8 -*-

#Autor: Erickson Silva 
#Email: <erickson.silva@lavid.ufpb.br>

#LAViD - Laboratório de Aplicações de Vídeo Digital

import os
import pika
import pysrt
import json
from thread import start_new_thread
from time import sleep
from urllib import urlretrieve

# credentials = pika.PlainCredentials('test', 'test')
# conn_send = pika.BlockingConnection(pika.ConnectionParameters(host='150.165.205.10', credentials=credentials))
# conn_receive = pika.BlockingConnection(pika.ConnectionParameters(host='150.165.205.10', credentials=credentials))

conn_send = pika.BlockingConnection(pika.ConnectionParameters(host='localhost',heartbeat_interval=0))
conn_receive = pika.BlockingConnection(pika.ConnectionParameters(host='localhost',heartbeat_interval=0))

def run(ch, method, properties, body):
	body = json.loads(body)
	try:
		filename = urlretrieve(body["subtitle"].encode("utf-8"))[0]
	except IOError, e:
		print str(e)
		return
	try:
		subtitle = pysrt.open(filename)
	except UnicodeDecodeError:
		subtitle = pysrt.open(filename, encoding='iso-8859-1')
	index = 1
	print "Extracting...",
	for sub in subtitle:
		pts = calculate_ms(str(sub.start))
		message = {'text': sub.text.encode("utf-8"), 'pts': pts,  'index': index}
		send_to_queue(message, properties)
		index += 1
	body['control-message'] = "FINALIZE"
	body['pts'] = -1
	body['index'] = index
	os.remove(filename)
	send_to_queue(body, properties)
	print "OK"

def calculate_ms(time_in):
	time = time_in.split(":")
	time = time[:2] + time[2].split(",")
	hour = int(time[0]) * 3600000
	minute = int(time[1]) * 60000
	second = int(time[2]) * 1000
	millisec = int(time[3]) + second + minute + hour
	return millisec

def send_to_queue(body, props):
	try:
		channel = conn_send.channel()
	except KeyError:
		reload_connection_send()
		channel = conn_send.channel()
	queue = "extractions"
	channel.queue_declare(queue=queue)
	channel.basic_publish(exchange='',
					  routing_key=queue,
					  properties=pika.BasicProperties(correlation_id = props.correlation_id),
					  body=json.dumps(body))
	channel.close()
	
def receive_from_queue():
	try:
		channel = conn_receive.channel()
	except KeyError:
		reload_connection_receive()
		channel = conn_receive.channel()
	queue = "requests"
	channel.queue_declare(queue=queue)
	channel.basic_qos(prefetch_count=1)
	channel.basic_consume(run,
				  queue=queue,
				  no_ack=True)
	channel.start_consuming()
	channel.close()

def reload_connection_send():
	global conn_send
	try:
		conn_send.close()
	except:
		pass
	conn_send = pika.BlockingConnection(pika.ConnectionParameters(host='localhost',heartbeat_interval=0))

def reload_connection_receive():
	global conn_receive
	try:
		conn_receive.close()
	except:
		pass
	conn_receive = pika.BlockingConnection(pika.ConnectionParameters(host='localhost',heartbeat_interval=0))
	
def keep_alive(conn_send, conn_receive):
	while  True:
		sleep(30)
		try:
			conn_send.process_data_events()
			conn_receive.process_data_events()
		except:
			continue

start_new_thread(keep_alive, (conn_send, conn_receive))
while True:
	try:
		receive_from_queue()
	except KeyboardInterrupt:
		conn_send.close()
		conn_receive.close()
		os._exit(0)