#!/usr/bin/python2.5
import sys
import os
import urllib2

# Try importing python gdata bindings from the system and then libs subdirectory
try:
	import gdata.photos.service
	import gdata.media
	import gdata.geo
except:
	sys.path.append('libs')
	import gdata.photos.service
	import gdata.media
	import gdata.geo


gd_client = gdata.photos.service.PhotosService()

def sync ( username, prefix, limit = None, imgmax = None ):
	prefix = os.path.join(prefix, username)
	if not os.path.isdir(prefix):
		print "Creating directory %s" % (prefix)
		os.makedirs(prefix)
	
	album_list = gd_client.GetUserFeed(user = username, limit = limit)
	for album in reversed(album_list.entry):
		sync_album(album, prefix, imgmax)
	

def sync_album ( album, prefix, imgmax ):
	album_dir = os.path.join(prefix,"%d" % (album.timestamp.datetime().year), "%d-%02d-%02d %s" % (album.timestamp.datetime().year, album.timestamp.datetime().month, album.timestamp.datetime().day, album.title.text) );
	if not os.path.isdir(album_dir):
		print "Creating directory %s" % (album_dir)
		os.makedirs(album_dir)

	current_dir = set(os.listdir(album_dir))
	new_files = []

	if not imgmax:
		photos = gd_client.GetFeed(album.GetPhotosUri())
	else:
		photos = gd_client.GetFeed("%s&imgmax=%s" % (album.GetPhotosUri(), imgmax ) )

	for photo in photos.entry:
		if not os.path.exists(os.path.join(album_dir, photo.title.text)):
			print "Downloading: %s -> %s" % (photo.content.src, os.path.join(album_dir, photo.title.text) )
			download(photo.content.src, os.path.join(album_dir, photo.title.text))
		new_files.append(photo.title.text)

	unlink = current_dir - set(new_files)
	for name in unlink:
		print "Deleting unused file %s" % (os.path.join(album_dir,name))
		os.remove(os.path.join(album_dir,name))

def download ( url, destination ):
	out = open(destination, 'w')
	out.write(urllib2.urlopen(url).read())

# users files to sync, where to load them on the device and the sclaing you want used.  See the gdata docs for possible resizing strings.
sync('ericewarnke', '/media/mmc1/Pictures/', imgmax = '800u')