# $Id$

import imp
import os
import logging


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

	def __init__(self, plugin_dirs=None):
		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)]


	def allPlugins(self):
		for plfile in self.__getPluginFiles():
			yield os.path.basename(plfile)[:-3]


	def getPlugin(self, name):
		for plfile in self.__getPluginFiles():
			if name == os.path.basename(plfile)[:-3]:
				return imp.load_source(name, plfile)
		else:
			return None
	

	def getTemplateFileName(self, plname, template_name):
		"""return the name of the template file, if it is part of the mentioned plugin
		"""
		result = [os.path.join(os.path.dirname(cur_file), template_name + ".cs")
			for cur_file in self.__getPluginFiles()
			if plname == os.path.basename(cur_file)[:-3]]
		for templ_file in result:
			if os.access(templ_file, os.R_OK) and os.path.isfile(templ_file):
				return templ_file
		else:
			return None



	def loadLanguageData(self, hdf, lang="en"):
		for plfile in self.__getPluginFiles():
			langdir = os.path.join(os.path.dirname(plfile), "lang")
			selected_langfile	= os.path.join(langdir, lang + ".hdf")
			default_langfile	= os.path.join(langdir, "en.hdf")
			for langfile in (selected_langfile, default_langfile):
				if os.access(langfile, os.R_OK):
					self.log.debug("Loading plugin language file: %s" % langfile)
					hdf.readFile(langfile)
					break
			else:
				self.log.debug("Couldn't find a plugin language file (%s)" % default_langfile)


	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("../plugins")
	for a in x.allPlugins():
		print "Plugin: %s" % a
		print x.getPlugin(a).getStatus()