# $Id$
#
# Copyright 2006 sense.lab e.V.
# 
# This file is part of the CryptoBox.
#
# The CryptoBox is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# The CryptoBox is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the CryptoBox; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#


import imp
import os
import logging


class PluginManager:
	"""manage available plugins"""

	def __init__(self, cbox, plugin_dirs=".", siteClass=None):
		self.cbox = cbox
		self.log = logging.getLogger("CryptoBox")
		self.site = siteClass
		if hasattr(plugin_dirs, "__iter__"):
			self.plugin_dirs = [os.path.abspath(dir) for dir in plugin_dirs]
		else:
			self.plugin_dirs = [os.path.abspath(plugin_dirs)]
		self.pluginList = self.__getAllPlugins()

	
	def getPlugins(self):
		return self.pluginList[:]
	

	def getPlugin(self, name):
		for p in self.pluginList[:]:
			if p.getName() == name:
				return p
		return None


	def __getAllPlugins(self):
		list = []
		for plfile in self.__getPluginFiles():
			list.append(self.__getPluginClass(os.path.basename(plfile)[:-3]))
		return list


	def __getPluginClass(self, name):
		for plfile in self.__getPluginFiles():
			if name == os.path.basename(plfile)[:-3]:
				try:
					pl_class = getattr(imp.load_source(name, plfile), name)
				except AttributeError:
					return None
				return pl_class(self.cbox, os.path.dirname(plfile), self.site)
		else:
			return None
	

	def __getPluginFiles(self):
		result = []
		if self.cbox and self.cbox.prefs["Main"]["DisabledPlugins"]:
			disabled = self.cbox.prefs["Main"]["DisabledPlugins"]
		else:
			disabled = []
		for dir in [os.path.abspath(e) for e in self.plugin_dirs if os.access(e, os.R_OK) and os.path.isdir(e)]:
			for plname in [f for f in os.listdir(dir)]:
				if plname in disabled:
					if self.cbox: self.cbox.log.info("skipped plugin '%s' (disabled via config)" % plname)
					continue
				pldir = os.path.join(dir, plname)
				plfile = os.path.join(pldir, plname + ".py")
				if os.path.isfile(plfile) and os.access(plfile, os.R_OK):
					result.append(plfile)
		return result


if __name__ == "__main__":
	x = PluginManager(None, "../plugins")
	for a in x.getPlugins():
		if not a is None:
			print "Plugin: %s" % a.getName()