# CCS CS Lab Facebook Utilities
#
# Douglas Thrift
#
# $Id$

from ccscslab.facebook.models import Publication, TemplateBundle, User
from ccscslab.main.models import UserProfile
import cgi
from datetime import datetime, timedelta
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.db.models import Q
import facebook
import os.path
import pytz
import threading

callback = settings.CCSCSLAB_CALLBACK + '/facebook'
callback_secure = settings.CCSCSLAB_CALLBACK_SECURE + '/facebook'
css_js = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..', 'templates', 'facebook'))
root = 'http://apps.facebook.com/' + settings.CCSCSLAB_FACEBOOK_ROOT
_facebook = facebook.Facebook(settings.FACEBOOK_API_KEY, settings.FACEBOOK_SECRET_KEY)

def get_facebook():
	try:
		__facebook = facebook.djangofb.get_facebook_client()

		if __facebook.session_key is not None and __facebook.uid is not None:
			return __facebook
	except ImproperlyConfigured:
		pass

	return _facebook

def publish(template_bundle, *args, **kwargs):
	_facebook = get_facebook()

	if Publication.objects.filter(user__id = _facebook.uid, published__gte = datetime.utcnow() - timedelta(days = 1)).count() < 10:
		Publication.objects.create(user_id = _facebook.uid, published = datetime.utcnow())

		return _facebook.feed.publishUserAction(template_bundle_id = TemplateBundle.objects.get(name = template_bundle).bundle_id, *args, **kwargs)

def set_user(id = settings.FACEBOOK_USER_ID):
	try:
		user = User.objects.get(Q(id = id), Q(session_expiry__gt = datetime.utcnow()) | Q(session_expiry = datetime.utcfromtimestamp(0)))

		_facebook.uid = user.id
		_facebook.session_key = '%s-%u' % (user.session, user.id)
		_facebook.session_key_expires = user.session_expiry

		return True
	except User.DoesNotExist:
		return False

set_user()

_local = threading.local()

def timezone():
	while True:
		try:
			return _local.timezone
		except AttributeError:
			def timezone():
				_facebook = get_facebook()

				utcoffset = timedelta(hours = int(_facebook.fql.query('select timezone from user where uid = %s' % _facebook.uid)[0]['timezone']))

				for timezone in pytz.common_timezones:
					timezone = pytz.timezone(timezone)

					if utcoffset == datetime.now(timezone).utcoffset():
						return timezone

				# XXX: something has gone horribly wrong, hooray!
				return pytz.timezone(settings.CCSCSLAB_TIMEZONE)

			_local.timezone = timezone()

def update_profile(user):
	_facebook = get_facebook()
	info = [
		{'field': 'Account', 'items': [{'label': user.person.name, 'link': user.get_facebook_url()}]},
		{'field': 'Shell', 'items': [{'label': user.person.shell, 'link': user.person.get_shell_url()}]},
	]

	try:
		userprofile = user.person.userprofile_set.get()
		email = userprofile.user.email

		if email is not None:
			info.append({'field': 'Email', 'items': [{'label': email, 'link': 'mailto:' + email}]})

		for screenname in userprofile.screenname_set.all():
			items = {'label': screenname.name}
			url = screenname.get_absolute_url()

			if url is not None:
				items['link'] = url

			info.append({'field': screenname.get_service_display(), 'items': [items]})

		phone = userprofile.phone

		if phone is not None:
			info.append({'field': 'Phone', 'items': [{'label': phone}]})

		website = userprofile.website

		if website is not None:
			info.append({'field': 'Website', 'items': [{'label': website, 'link': website}]})
	except UserProfile.DoesNotExist:
		pass

	#_facebook.profile.setInfo(uid = user.id, title = 'CCS CS Lab', type = 1, info_fields = info)

	def profile(info_):
		profile = '<dl class="info">'

		for info in info_:
			item = info['items'][0]

			profile += '<dt style="float: none; padding-bottom: 2px;">' + cgi.escape(info['field']) + ':</dt><dd style="float: none; margin-right: 2px; overflow: hidden; padding: 0 0 6px;">'

			if 'link' in item:
				profile += '<a href="%s">%s</a>' % (cgi.escape(item['link'], True), cgi.escape(item['label']))
			else:
				profile += cgi.escape(item['label'])

			profile += '</dd>'

		profile += '</dl>'

		return profile

	#_facebook.profile.setFBML(uid = user.id, profile = profile(info), profile_main = profile(info[:2]))