# $Id$

import imp
import os
import logging


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

	def __init__(self, cbox, plugin_dirs="."):
		self.cbox = cbox
		self.log = logging.getLogger("CryptoBox")
		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))
		else:
			return None
	

	def __getPluginFiles(self):
		result = []
		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)]:
				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, None, "../plugins")
	for a in x.getPlugins():
		if not a is None:
			print "Plugin: %s" % a.getName()