#!/usr/bin/env python

# -*- coding: utf-8 -*-

import anyjson

from twisted.enterprise import adbapi

from twisted.internet import reactor, task

from twisted.internet.protocol import Protocol, Factory

from autobahn.websocket import WebSocketServerFactory, WebSocketServerProtocol

connectstring = "dbname='tweet_live' user='postgres' host='localhost' password='doiteshimashite'"

columns = [ 'id', 'created_at', 'text', 'user_id', 'screen_name' ]

selectcommon = "SELECT tweet_tweet.id, tweet_tweet.created_at, text, user_id, screen_name FROM tweet_tweet JOIN tweet_user ON tweet_tweet.user_id = tweet_user.id"

dbpool = adbapi.ConnectionPool("psycopg2",connectstring)

class TweetCast:

	def __init__(self):

		self.lastid = 0L

		self.serverfactory = TweetcastServerFactory(tweetcast=self)

		dbpool.runQuery("SELECT MAX(tweet_tweet.id) FROM tweet_tweet").addCallback(self.callbackInit)

	def callbackInit(self, result):

		self.lastid = result[0][0]

		task.LoopingCall(self.scheduleTweets).start(1)

	def scheduleTweets(self):

		dbpool.runQuery("%s WHERE tweet_tweet.id > %d ORDER BY tweet_tweet.id ASC"%(selectcommon, self.lastid)).addCallback(self.callbackTweets)

	def callbackTweets(self, result):

		if result:

			self.lastid = result[len(result)-1][0]

			data = [dict((columns[i], str(ligne[i])) for i in range(len(columns))) for ligne in result]

		else:

			data = None

		self.serverfactory.broadcast(anyjson.serialize(data))

class TweetcastServerProtocol(WebSocketServerProtocol):

	def onOpen(self):

		self.factory.register(self)

		dbpool.runQuery("%s WHERE tweet_tweet.id <= %d ORDER BY tweet_tweet.id DESC LIMIT 100"%(selectcommon, self.factory.tweetcast.lastid)).addCallback(self.callbackOldTweets)

	def callbackOldTweets(self, result):

		if result:

			data = [dict((columns[i], str(ligne[i])) for i in range(len(columns))) for ligne in result]

			data.reverse()

		else:

			data = None

		self.sendMessage(anyjson.serialize(data))

		print "sending old tweets to new client"

	def connectionLost(self, reason):

		WebSocketServerProtocol.connectionLost(self, reason)

		self.factory.unregister(self)

	def onMessage(self, msg, binary):

		print "Got message: " + msg

class TweetcastServerFactory(WebSocketServerFactory):

   protocol = TweetcastServerProtocol

   def __init__(self, tweetcast=None):

      WebSocketServerFactory.__init__(self)

      self.clients = []

      self.tweetcast = tweetcast

   def register(self, client):

      if not client in self.clients:

         print "registered client " + client.peerstr

         self.clients.append(client)

   def unregister(self, client):

      if client in self.clients:

         print "unregistered client " + client.peerstr

         self.clients.remove(client)

   def broadcast(self, msg):

      print "broadcasting ids up to %d" % self.tweetcast.lastid

      for c in self.clients:

         print "send to " + c.peerstr

         c.sendMessage(msg)

class FlashPolicySocketProtocol(Protocol):

    def dataReceived(self, data):

        self.transport.write("<?xml version=\"1.0\"?><!DOCTYPE cross-domain-policy SYSTEM \"/xml/dtds/cross-domain-policy.dtd\"><cross-domain-policy><site-control permitted-cross-domain-policies=\"master-only\"/><allow-access-from domain=\"*\" to-ports=\"*\" /></cross-domain-policy>\0") 

class FlashPolicyFactory(Factory):

    def __init__(self):

        self.protocol = FlashPolicySocketProtocol;

tc = TweetCast()

reactor.listenTCP(843, FlashPolicyFactory())

reactor.listenTCP(9000, tc.serverfactory)

reactor.run()