#!/usr/bin/python

import sys
outfile = sys.argv[1]
inurls = sys.argv[2:]

from datetime import *
import xml.etree.ElementTree as ET
import urllib2

ET.register_namespace('itunes', "http://www.itunes.com/dtds/podcast-1.0.dtd")
ET.register_namespace('podcastRF', "http://radiofrance.fr/Lancelot/Podcast#")
ET.register_namespace('radioline', "http://www.radioline.co/")

now = datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S %z")+'+0000'

default = """<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" xmlns:podcastRF="http://radiofrance.fr/Lancelot/Podcast#" xmlns:radioline="http://www.radioline.co/" version="2.0">
	<channel>
		<title>Journal de France Inter</title>
		<link>
			http://www.franceinter.fr/emission-le-journal-de-13h
		</link>
		<description>
			Le grand rendez-vous d'information
		</description>
		<language>fr</language>
		<copyright>Radio France</copyright>
		<lastBuildDate>Thu, 20 Apr 2017 13:48:30 +0200</lastBuildDate>
		<generator>Radio France</generator>
		<image>
			<url>
				http://media.radiofrance-podcast.net/podcast09/RF_OMM_0000014086_ITE.jpg
			</url>
			<title>Journal de France Inter</title>
			<link>
				http://www.franceinter.fr/emission-le-journal-de-13h
			</link>
		</image>
		<itunes:author>France Inter</itunes:author>
		<itunes:category text="News &amp; Politics"/>
		<itunes:explicit>no</itunes:explicit>
		<itunes:image href="http://media.radiofrance-podcast.net/podcast09/RF_OMM_0000014086_ITE.jpg"/>
		<itunes:owner>
		<itunes:email>podcast@radiofrance.com</itunes:email>
		<itunes:name>Radio France</itunes:name>
		</itunes:owner>
		<itunes:subtitle>Journal de France Inter</itunes:subtitle>
		<itunes:summary>
			Le grand rendez-vous d'information
		</itunes:summary>
		<radioline:test />
	</channel>
</rss>"""

items = []

def itemtuple(item, source=None):
	s = None
	for i in item:
		if i.tag == 'pubDate':
			dt = i.text.rsplit(' ', 1)
			dt = datetime.strptime(dt[0], '%a, %d %b %Y %H:%M:%S') - \
					timedelta(hours=int(dt[1][0]+dt[1][1:3])) - \
					timedelta(hours=int(dt[1][0]+dt[1][3:5]))
		if i.tag == 'guid':
			guid = i.text
		if i.tag == '{http://www.radioline.co/}source':
			s = i
			source = i.text
	if s is None:
		s = ET.SubElement(item, '{http://www.radioline.co/}source')
		s.text = source
	return (dt, source, guid, item)

try:
	root = ET.fromstring(open(outfile).read())
	for channel in root: pass
	while True:
		for item in channel:
			if item.tag == 'item':
				i = itemtuple(item)
				items.append(itemtuple(item))
				channel.remove(item)
				break
		else: break
except IOError:
	root = ET.fromstring(default)
	for channel in root: pass
for lbd in channel:
	if lbd.tag == 'lastBuildDate':
		lbd.text = now

for url in inurls:
	try: rss = urllib2.urlopen(url).read()
	except urllib2.URLError: continue
	rss = ET.fromstring(rss)
	# rss = rss.getroot()
	for rss in rss: pass
	for item in rss:
		if item.tag == 'item':
			i = itemtuple(item, url)
			items.append(itemtuple(item, url))

items.sort(reverse=True)
seen = set()
for item in items:
	iid = tuple(item[1:-1])
	if iid in seen: continue
	seen.add(iid)
	channel.append(item[-1])

tree = ET.ElementTree(root)
tree.write(outfile)