__author__="bjschuma"
__date__ ="$Dec 8, 2009 8:40:36 AM$"

import sys
from bt.message import *
import loader

class Manager:
	def __init__(self):
		write("Creating plugin manager", True)
		# Map the plugin name to a dictionary
		self.enabled = dict()
		self.disabled = dict()


	def addPlugins(self, plugins):
		# Add each plugin to the disabled list
		for plugin in plugins:
			write("Adding plugin: " + str(plugin), True)
			self.disabled[plugin.name] = plugin
			# If we are adding a core plugin, activate it right away
			try:
				if plugin.type=="core":
					self.enablePlugin(plugin.name)
			except:
				error("Error adding plugin: "+plugin.name)


	# Move plugin from old[name] to new[name]
	# Return the plugin
	def movePlugin(self, name, old, new):
		plugin = old.pop(name)
		new[name] = plugin
		return plugin


	# Disable a plugin
	# Returns true if there was a plugin to disable, false otherwise
	def disablePlugin(self,name):
		if (name in self.enabled) == True:
			write("Disabling plugin: "+name, True)
			plugin = self.movePlugin(name, self.enabled, self.disabled)
			plugin.close()
			return True
		return False


	# Move a plugin to the enabled list
	# Returns true if a plugin was enabled, false otherwise
	def enablePlugin(self,name):
		if (name in self.disabled) == True:
			try:
				write("Enabling plugin: "+name,True)
				plugin = self.movePlugin(name, self.disabled, self.enabled)
				plugin.open()
				return True
			except:
				error("Error enabling: "+name)
		return False


	# Disable the plugin, reload it, reenable it
	def reloadPlugin(self,name):
		# Check if plugin has been loaded
		if (name in sys.modules) == False:
			write("Plugin not loaded: "+name, True)
			return
		# Disable the plugin and pop from sys.modules
		reenable = self.disablePlugin(name)
		reload(self.disabled[name])
		if reenable == True:
			self.enablePlugin(name)


	# Disable all plugins
	def shutdown(self):
		write("Shutting down manager, disabling all active plugins", True)
		keys = self.enabled.keys()
		for plugin in keys:
			self.disablePlugin(plugin)


	def run(self,name,args=None):
		name = name.strip()

		if (name in self.enabled)==True:
			self.enabled[name].run(args)


global manager
manager = Manager()