#!/usr/bin/python3

from utils import *
from download_page import download

# portable code to get filename
import os
platform = os.path.basename(__file__)
if platform.endswith(".py"):
	platform = platform[:(-3)]

def extract_from_url (url, verbosity):
	# split into domain and path
	index = url.find("/", url.find("//")+2)
	domain = url[:index]
	path = url[index:]

	# get owner/organization name
	index = path.find("/",1)
	if index < 0:
		# we could just return None here, as this means no project
		org = path[1:]
	else:
		org = path[1:index]
	if org == "":
		return None

	# get project name
	index2 = path.find("/",index+1)
	if index2 < 0:
		project = path[index+1:]
	else:
		project = path[index+1:index2]
	if project == "":
		return None

	# get page category
	index3 = path.find("/",index2+1)
	if index3 < 0:
		category = path[index2+1:]
	else:
		category = path[index2+1:index3]

	# return feed based on category
	urlbase = domain + "/" + org + "/" + project + "/"
	if category == "":
		# note, this is an alternate link to /org/project/commits/default-branch.atom
		return urlbase + "commits.atom"
	elif category == "releases":
		return urlbase + "releases.atom"
	elif category == "tags":
		return urlbase + "tags.atom"
	elif category == "tree":
		# get current branch
		index4 = path.find("/",index3+1)
		if index4 < 0:
			branch = path[index3+1:]
		else:
			branch = path[index3+1:index4]
		if branch != "":
			# return commit feed for that branch
			return urlbase + "commits/" + branch + ".atom"

def extract_from_page (page, verbosity):
	result = search (page, '<link href="', 'type="application/atom+xml">', reverse=True)
	if not result is None:
		# strip '" rel="alternate" title="Recent Commits to <project name>:<branch>" '
		index = result.find('"')
		result = result[:index]
		if not result == "":
			return result

def extract (url, page=None, network=False, verbosity=3, args={}):
	feed = extract_from_url (url, verbosity)
	if not feed is None:
		return feed
	else:
		notify ("Unable to get feed from URL alone", verbosity, platform)
		if network == True:
			page = download (platform, url, args, verbosity)
			feed = extract_from_page (page, verbosity)
			if not feed is None:
				return feed