import os, sys
from . import inifile
from . import objproxy
from .. import preconfig


config = objproxy.Proxy({})
paths = []
filenames = []

def init(appname=None):
	global paths, filenames
	paths = []
	filenames = []
	if appname != None:
		if os.name == 'posix':
			if 'HOME' in os.environ:
				paths.append(os.path.join(os.environ['HOME'], appname))
			paths.append(os.path.join('/etc', appname))
			filenames.extend([x % (appname) for x in ('%s.conf', '%s.ini', '%s.cfg', '%s.cnf')])
			
		elif os.name == 'nt':
			if 'APPDATA' in os.environ:
				paths.append(os.path.join(os.environ['APPDATA'], appname))
			if 'LOCALAPPDATA' in os.environ:
				paths.append(os.path.join(os.environ['LOCALAPPDATA'], appname))
			filenames.extend([x % (appname) for x in ('%s.ini', '%s.conf', '%s.cfg', '%s.cnf')])
			
		
	if os.name == 'posix':
		if 'HOME' in os.environ:
			paths.append(os.environ['HOME'])
		paths.append('/etc')

	try:
		paths.append(os.path.abspath(os.path.dirname(__file__)))
	except:
		pass
	
	if os.name == 'nt':
		if 'USERPROFILE' in os.environ:
			paths.append(os.environ['USERPROFILE'])
		if 'WINDIR' in os.environ:
			paths.append(os.environ['WINDIR'])
		if 'SYSTEMDRIVE' in os.environ:
			paths.append('%s\\' % (os.environ['SYSTEMDRIVE']),)

	try:
		paths.append(os.path.abspath(os.path.split(os.path.dirname(__file__))[0]))
		paths.append(os.path.abspath(os.path.dirname(sys.argv[0])))
	except:
		pass
	
	if os.name == 'posix':
		filenames.extend(['settings.conf', 'settings.ini', 'settings.cfg', 'settings.cnf'])
	else:
		filenames.extend(['settings.ini', 'settings.conf', 'settings.cfg', 'settings.cnf'])

	load_config()

def locate_config(paths, filenames):
	fd = None
	for p in paths:
		for f in filenames:
			fp = os.path.join(p, f)
			if os.path.exists(fp):
				try:
					fd = inifile.inifile(fp)
				except SystemExit:
					fd = None
	return fd
		
def load_config(fname=None):
	global paths, filenames
	if fname != None:
		fp, fn = os.path.split(fname)
	else:
		fp, fn = None, None
		
	if fp:
		pp = [fp]
	else:
		pp = paths[:]
	
	if fn:
		ff = [fn]
	else:
		ff = filenames[:]
		
	fd = locate_config(pp, ff)
	if fd != None:
		config._setobj(fd)
		
def save_config(original_name=True, make_path=True):
	if original_name:
		fp = config.fname
	else:
		saved = False
		for f in filenames:
			for p in paths:
				if make_path:
					try:
						os.makedirs(p)
					except OSError:
						pass
				if os.path.exists(p):
					fp = os.path.join(p, f)
					config.fname = fp
					try:
						config.write()
					except OSError:
						continue
					saved = True
					break
		if not saved:
			raise(OSError, "No writable path to save configuration")
		
if preconfig.load_config:		
	init(preconfig.appname)