import json, logging, os
from User import User
from Plugin import PluginManager
from Config import config


@PluginManager.acceptPlugins
class UserManager(object):
	def __init__(self):
		self.users = {}


	# Load all user from data/users.json
	def load(self):
		if not self.users: self.users = {}

		user_found = []
		added = 0
		# Load new users
		for master_address, data in json.load(open("%s/users.json" % config.data_dir)).items():
			if master_address not in self.users:
				user = User(master_address, data=data)
				self.users[master_address] = user
				added += 1
			user_found.append(master_address)

		# Remove deleted adresses
		for master_address in self.users.keys():
			if master_address not in user_found: 
				del(self.users[master_address])
				logging.debug("Removed user: %s" % master_address)

		if added: logging.debug("UserManager added %s users" % added)


	# Create new user
	# Return: User
	def create(self, master_address=None, master_seed=None):
		user = User(master_address, master_seed)
		logging.debug("Created user: %s" % user.master_address)
		if user.master_address: # If successfully created
			self.users[user.master_address] = user
			user.save()
		return user


	# List all users from data/users.json
	# Return: {"usermasteraddr": User}
	def list(self):
		if self.users == {}: # Not loaded yet
			self.load()
		return self.users


	# Get user based on master_address
	# Return: User or None
	def get(self, master_address=None):
		users = self.list()
		if users:
			return users.values()[0] # Single user mode, always return the first
		else:
			return None


user_manager = UserManager() # Singletone

# Debug: Reload User.py
def reloadModule():
	return "Not used"
	
	import imp
	global User, UserManager, user_manager
	User = imp.load_source("User", "src/User/User.py").User # Reload source
	#module = imp.load_source("UserManager", "src/User/UserManager.py") # Reload module
	#UserManager = module.UserManager
	#user_manager = module.user_manager
	# Reload users
	user_manager = UserManager()
	user_manager.load()