#!/usr/bin/python
#
# update-planet
#
# Downloads feeds from the URLs specified and generates the XHTML files.
#
# (c) 2004, Davyd Madeley <davyd@ucc.asn.au>
#

# standard python modules
import sys, codecs
# planetUCC modules
import XMLParse2 as XMLParse, XMLWriter, CacheHandler
# planetUCC output plugins
import XHTMLWriter, RSS2Writer, RSS1Writer, FOAFWriter, OPMLWriter

# step 1: read in the config and check each object from cache
cache	= CacheHandler.CacheHandler()
feeds	= []

for feed in open('feedlist').readlines():
	if feed.strip()[0] != '#':
		storage		= feed.strip().split('\t')
		name, feed	= storage[0], storage[-1]
		try:
			feeds.append((name, feed, cache.getBlog(name, feed)))
		except:
			sys.stderr.write('DEBUG: update-planet: something went wrong retrieving feed\n')

# step 2: process each feed
tainted	= False
blogs	= []
for feed in feeds:
	# XMLParse2 takes two paramaters, a URL and a CacheObject
	blog	= XMLParse.XMLParse(feed[1], feed[2]).parse()
	if blog:
		blog.blogName	= feed[0]
		blog.feedURL	= feed[1]
		blogs.append(blog)
		# check the old copy of the cache, vs the new copy
		if not feed[2] or not feed[2].cache or not blog.cache or feed[2].cache != blog.cache:
			tainted	= True
		elif len(blog.items) > 0 and len(feed[2].items) > 0 and (blog.items[0].itemTitle != feed[2].items[0].itemTitle or blog.items[0].contents != feed[2].items[0].contents):
			tainted = True
		# write the cache back down to disk
		cache.storeBlog(blog)
	else:
		pass

# step 3: sift the feeds
xmlwriter	= XMLWriter.XMLWriter(blogs)

# step 4: write feed to disk
try:
	codecs.open('planet.html', 'wb', 'utf-8').write(xmlwriter.write(XHTMLWriter.XHTMLWriter))
except:
	sys.stderr.write('DEBUG: update-planet: could not write planet.html, aborting\n')
	raise

try:
	codecs.open('rss2.xml', 'wb', 'utf-8').write(xmlwriter.write(RSS2Writer.RSS2Writer))
except:
	sys.stderr.write('DEBUG: update-planet: could not write rss2.xml, aborting\n')

try:
	codecs.open('rss1.xml', 'wb', 'utf-8').write(xmlwriter.write(RSS1Writer.RSS1Writer))
except:
	sys.stderr.write('DEBUG: update-planet: could not write rss1.xml, aborting\n')

try:
	codecs.open('foaf.xml', 'wb', 'utf-8').write(xmlwriter.write(FOAFWriter.FOAFWriter))
except:
	sys.stderr.write('DEBUG: update-planet: could not write foaf.xml, aborting\n')

try:
	codecs.open('opml.xml', 'wb', 'utf-8').write(xmlwriter.write(OPMLWriter.OPMLWriter))
except:
	sys.stderr.write('DEBUG: update-planet: could not write opml.xml, aborting\n')


if not tainted:
	sys.stdout.write('PlanetUCC: no objects have changed in the cache, not updating\n')
	sys.exit(1)