import threading
from . import specs
try: from urllib.parse import quote_plus
except ImportError: from urllib import quote_plus	
import skitai

class WebSocketServers:
	def __init__ (self, wasc):
		self.wasc = wasc
		self._nomore = False
		self.lock = threading.RLock ()
		self.wss = {}
	
	def get (self, gid, default = None):
		with self.lock:
			return self.wss.get (gid, default)		
		
	def has_key (self, gid):	
		with self.lock:
			has = gid in self.wss		
		return has
		
	def create (self, gid, *args):	
		with self.lock:
			if self._nomore: 
				return
				
		wss = WebSocketServer (gid, *args)
		with self.lock:
			self.wss [gid] = wss		
		return wss
		
	def remove (self, gid):
		with self.lock:
			try: 
				del self.wss [gid]			
			except KeyError: 
				pass		
	
	def close (self):
		with self.lock:
			wss = list (self.wss.items ())
			self._nomore = True
		for k, s in wss:
			self.wasc.logger ('server', '...closing websockket %s' % k)
			s.close ()
	
	def cleanup (self):
		self.close ()
		

class WebSocketServer (specs.WebSocket1):
	def __init__ (self, gid, handler, request, apph, env, message_encoding = None):
		specs.WebSocket.__init__ (self, handler, request, message_encoding)
		self._closed = False
		self.gid = gid
		self.apph = apph
		self.env = env
		self.messages = []
		self.clients = {}
		self.client_id = None
			
	def add_client (self, ws):
		self.clients [ws.client_id] = ws
		ws.handle_message (1, skitai.WS_EVT_OPEN)
		
	def handle_message (self, client_id, msg, querystring, params, message_param):		
		if msg == -1: # exit
			try: del self.clients [client_id]
			except KeyError: pass
			msg = ""			
			if not self.clients:
				return self.close ()
		elif msg == 1: # enter
			msg = ""
		
		params [message_param] = self.message_decode (msg)
		self.env ["websocket.params"] = params	
		self.env ["QUERY_STRING"] = querystring + quote_plus (msg)
		self.env ["websocket.client"] = client_id
		
		self.client_id = client_id
		self.execute ()
		self.client_id = None
		
	def close (self):
		websocket_servers.remove (self.gid)
		self.clients = {}
		self._closed = True
			
	def send (self, msg, client_id = None, op_code = -1):
		msg, op_code = self.build_data (msg, op_code)						
		if client_id:
			self.__sendto (client_id, msg, op_code)
		else:
			self.__sendall (msg, op_code)
	
	def __sendall (self, msg, op_code = -1):
		clients = list (self.clients.keys ())
		for client_id in clients:
			self.__sendto (client_id, msg, op_code)
			
	def __sendto (self, client_id, msg, op_code = -1):
		try:
			client = self.clients [client_id]
		except KeyError:
			client = None	
		if client:
			client.send (msg, op_code)
	
websocket_servers = None

def start_websocket (wasc):
	global websocket_servers
	
	websocket_servers = WebSocketServers (wasc)
	
	
