import time, sys
from datetime import datetime
import cPickle as pickle

from twisted.conch.telnet import StatefulTelnetProtocol

import cmdhandler
from apps.objects.models import Object
from django.contrib.auth.models import User
import functions_db
import functions_general
import session_mgr

class SessionProtocol(StatefulTelnetProtocol):
   """
   This class represents a player's sesssion. From here we branch down into
   other various classes, please try to keep this one tidy!
   """

   def connectionMade(self):
      """
      What to do when we get a connection.
      """
      self.prep_session()
      functions_general.log_infomsg('Connection: %s' % (self,))
      session_mgr.add_session(self)
      self.game_connect_screen()

   def getClientAddress(self):
      """
      Returns the client's address and port in a tuple. For example
      ('127.0.0.1', 41917)
      """
      return self.transport.client

   def prep_session(self):
      self.server = self.factory.server
      self.address = self.getClientAddress()
      self.name = None
      self.uid = None
      self.logged_in = False
      # The time the user last issued a command.
      self.cmd_last = time.time()
      # Player-visible idle time, excluding the IDLE command.
      self.cmd_last_visible = time.time()
      # Total number of commands issued.
      self.cmd_total = 0
      # The time when the user connected.
      self.conn_time = time.time()
      self.channels_subscribed = {}

   def disconnectClient(self):
      """
      Manually disconnect the client.
      """
      self.transport.loseConnection()

   def connectionLost(self, reason):
      """
      Execute this when a client abruplty loses their connection.
      """
      functions_general.log_infomsg('Disconnect: %s' % (self,))
      self.handle_close()

   def load_user_channels(self):
      """
      Un-pickle a user's channel list from their CHANLIST attribute.
      """
      chan_list = self.get_pobject().get_attribute_value("CHANLIST")
      if chan_list:
         self.channels_subscribed = pickle.loads(chan_list)
      
   def lineReceived(self, data):
      """
      Any line return indicates a command for the purpose of a MUD. So we take
      the user input and pass it to our command handler.
      """
      line = (''.join(data))
      line = line.strip('\r')
      uinput = line
      
      # Stuff anything we need to pass in this dictionary.
      cdat = {"server": self.factory.server, "uinput": uinput, "session": self}
      cmdhandler.handle(cdat)

   def execute_cmd(self, cmdstr):
     """
     Executes a command as this session.
     """
     self.lineReceived(data=cmdstr)
         
   def handle_close(self):
      """
      Break the connection and do some accounting.
      """
      pobject = self.get_pobject()
      if pobject:
         pobject.set_flag("CONNECTED", False)
         pobject.get_location().emit_to_contents("%s has disconnected." % (pobject.get_name(show_dbref=False),), exclude=pobject)
         uaccount = pobject.get_user_account()
         uaccount.last_login = datetime.now()
         uaccount.save()
         
      self.disconnectClient()
      self.logged_in = False
      session_mgr.remove_session(self)
      
   def get_pobject(self):
      """
      Returns the object associated with a session.
      """
      try:
         result = Object.objects.get(id=self.uid)
         return result
      except:
         return False
      
   def game_connect_screen(self):
      """
      Show the banner screen.
      """
      buffer =  '-'*50
      buffer += ' \n\rWelcome to Evennia!\n\r'
      buffer += '-'*50 + '\n\r'
      buffer += """Please type one of the following to begin:\n\r 
         connect <email> <password>\n\r
         create \"<username>\" <email> <password>\n\r"""
      buffer += '-'*50
      self.msg(buffer)

   def is_loggedin(self):
      """
      Returns a boolean True if the session is logged in.
      """
      try:
         return self.logged_in
      except:
         return False
   
   def login(self, user):
      """
      After the user has authenticated, handle logging him in.
      """
      self.uid = user.id
      self.name = user.username
      self.logged_in = True
      self.conn_time = time.time()
      pobject = self.get_pobject()
      session_mgr.disconnect_duplicate_session(self)
      pobject.set_flag("CONNECTED", True)

      self.msg("You are now logged in as %s." % (self.name,))
      pobject.get_location().emit_to_contents("%s has connected." % (pobject.get_name(show_dbref=False),), exclude=pobject)
      self.execute_cmd("look")
      functions_general.log_infomsg("Login: %s" % (self,))
      
      # Update their account's last login time.
      user.last_login = datetime.now()
      user.save()
      pobject.set_attribute("Last", "%s" % (time.strftime("%a %b %d %H:%M:%S %Y", time.localtime()),))
      pobject.set_attribute("Lastsite", "%s" % (self.address[0],))

      # Load their channel selection from a pickled attribute.
      self.load_user_channels()
      
   def msg(self, message):
      """
      Sends a message to the session.
      """
      self.sendLine("%s" % (message,))
      
   def __str__(self):
      """
      String representation of the user session class. We use
      this a lot in the server logs and stuff.
      """
      if self.is_loggedin():
         symbol = '#'
      else:
         symbol = '?'
      return "<%s> %s@%s" % (symbol, self.name, self.address,)