"""
The version utility module is used to get the current Cura version, and check for updates.
It can also see if we are running a development build of Cura.
"""
__copyright__ = "Copyright (C) 2013 David Braam - Released under terms of the AGPLv3 License"

import os
import sys
import urllib2
import platform
import subprocess
try:
	from xml.etree import cElementTree as ElementTree
except:
	from xml.etree import ElementTree

from Cura.util import resources

def getVersion(getGitVersion = True):
	gitPath = os.path.abspath(os.path.join(os.path.split(os.path.abspath(__file__))[0], "../.."))
	if hasattr(sys, 'frozen'):
		versionFile = os.path.normpath(os.path.join(resources.resourceBasePath, "version"))
	else:
		versionFile = os.path.abspath(os.path.join(os.path.split(os.path.abspath(__file__))[0], "../version"))

	if getGitVersion:
		try:
			gitProcess = subprocess.Popen(args = "git show -s --pretty=format:%H", shell = True, cwd = gitPath, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
			(stdoutdata, stderrdata) = gitProcess.communicate()

			if gitProcess.returncode == 0:
				return stdoutdata
		except:
			pass

	gitHeadFile = gitPath + "/.git/refs/heads/master"
	if os.path.isfile(gitHeadFile):
		if not getGitVersion:
			return "dev"
		f = open(gitHeadFile, "r")
		version = f.readline()
		f.close()
		return version.strip()
	if os.path.exists(versionFile):
		f = open(versionFile, "r")
		version = f.readline()
		f.close()
		return version.strip()
	versionFile = os.path.abspath(os.path.join(os.path.split(os.path.abspath(__file__))[0], "../../version"))
	if os.path.exists(versionFile):
		f = open(versionFile, "r")
		version = f.readline()
		f.close()
		return version.strip()
	return "UNKNOWN" #No idea what the version is. TODO:Tell the user.

def isDevVersion():
	gitPath = os.path.abspath(os.path.join(os.path.split(os.path.abspath(__file__))[0], "../../.git"))
	hgPath  = os.path.abspath(os.path.join(os.path.split(os.path.abspath(__file__))[0], "../../.hg"))
	return os.path.exists(gitPath) or os.path.exists(hgPath)

def checkForNewerVersion():
	if isDevVersion():
		return None
	try:
		updateBaseURL = ''
		localVersion = map(int, getVersion(False).split('.'))
		while len(localVersion) < 3:
			localVersion += [1]
		latestFile = urllib2.urlopen("%s/latest.xml" % (updateBaseURL))
		latestXml = latestFile.read()
		latestFile.close()
		xmlTree = ElementTree.fromstring(latestXml)
		for release in xmlTree.iter('release'):
			os = str(release.attrib['os'])
			version = [int(release.attrib['major']), int(release.attrib['minor']), int(release.attrib['revision'])]
			filename = release.find("filename").text
			if platform.system() == os:
				if version > localVersion:
					return "%s/current/%s" % (updateBaseURL, filename)
	except:
		#print sys.exc_info()
		return None
	return None

if __name__ == '__main__':
	print(getVersion())