import sys
import os
import re
from S2Wrapper import ConsoleParser

class Plugin(object):
	pass


class ConsolePlugin(ConsoleParser, object):
	pass


_instances = {}
_modules = {}
def discover_plugins():

	plugin_dir = "%s/plugins" % os.path.dirname (os.path.realpath (__file__))
	plugins = [x[:-3] for x in os.listdir(plugin_dir) if x.endswith(".py")]
	sys.path.insert (0, plugin_dir)

	for plugin in plugins:
		print "Plugin discovered: %s\n" % plugin
		try:
			
			mod = __import__ (plugin, None, None, [''])
	
			name = re.match ("<module '(\S+)' from '.*'>" , str(mod)).group (1)
			_modules [name] = mod
		except:
			print "Syntax error for plugin %s.\n" % plugin


def get_enabled_plugins(type):
	rtn = []

	for name in _instances:
		rtn.append (_instances[name])

	return rtn

def reload_by_name(name, type):

	for _mod in _modules:
		if (_mod == name):
			try:
				print "Reloaded plugin %s" % _mod
				_modules[_mod] = reload(_modules [_mod])
			except:
				print "Error reloading plugin %s" % _mod

def disable_by_name(name, type):
	
	plugins = list_plugin_names (type)

	if name not in plugins:
		print "plugin %s does not exist.\n" % name
		return False

	_plugin = type.__subclasses__ () [plugins.index (name)]
	if not _plugin:
		print "Plugin %s has not been found.\n" % name
		return False

	else:
		if _plugin in _instances:
			del _instances [_plugin]
			#print "Plugin %s has been disabled.\n" % name
			return True
		else:
			print "plugin %s is _already_ disabled\n" % name
			return False


def enable_by_name(name, type):

	plugins = list_plugin_names (type)

	if name not in plugins:
		print "plugin %s does not exist.\n" % name
		return False

	_plugin = type.__subclasses__ () [plugins.index (name)]
	if not _plugin:
		print "Plugin has not been found.\n" %_plugin
		return False
	else:
		if not _plugin in _instances:
			_instances[_plugin] = _plugin ()

			#print "plugin %s has been enabled\n" % name
			return True
		else:
			print "plugin %s has _already_ been enabled\n" % name
			return False

def list_plugins(type):
	return type.__subclasses__()

def list_plugin_names(type):
	rtn = []
	for plugin in type.__subclasses__():
		rtn.append (re.match ("<class '(\S+)\.(\S+)'>" , str(plugin)).group (1))

	return rtn