# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import ether_types
from ryu.topology.switches import Switch
from ryu.topology import event, switches
from ryu.topology.api import get_switch, get_link, get_all_switch
import socket
import pickle
import json
from json import JSONEncoder
import jsonpickle
import sys

i = 0
class SimpleSwitch13(app_manager.RyuApp, JSONEncoder):
    OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
    
     
    def __init__(self, *args, **kwargs):
        super(SimpleSwitch13, self).__init__(*args, **kwargs)
        self.mac_to_port = {}

    @set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
    def switch_features_handler(self, ev):
     	
        datapath = ev.msg.datapath
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        dpid = datapath.id
        self.logger.info("packet in %s ", dpid)
        # install table-miss flow entry
        #
        # We specify NO BUFFER to max_len of the output action due to
        # OVS bug. At this moment, if we specify a lesser number, e.g.,
        # 128, OVS will send Packet-In with invalid buffer_id and
        # truncated packet data. In that case, we cannot output packets
        # correctly.  The bug has been fixed in OVS v2.1.0.
        match = parser.OFPMatch(in_port = 1)    
        actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER, ofproto.OFPCML_NO_BUFFER)]
        self.add_flow(datapath, 1, match, actions)
        #match = parser.OFPMatch(in_port = 0)
        match = parser.OFPMatch()        
        actions = [parser.OFPActionOutput(1)]
        self.add_flow(datapath, 0, match, actions)

    def add_flow(self, datapath, priority, match, actions, buffer_id=None):
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser

        inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
                                             actions)]
        if buffer_id:
            mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
                                    priority=priority, match=match,
                                    instructions=inst)
        else:
            mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
                                    match=match, instructions=inst)
        datapath.send_msg(mod)

    @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
    def _packet_in_handler(self, ev):
        global i
        print 'i =', i
        i = i + 1
        # If you hit this you might want to increase
        # the "miss_send_length" of your switch
        if ev.msg.msg_len < ev.msg.total_len:
            self.logger.debug("packet truncated: only %s of %s bytes",ev.msg.msg_len, ev.msg.total_len)
        msg = ev.msg
        #print "type is", type(msg)
        #print "msg is", msg
        datapath = msg.datapath
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        in_port = msg.match['in_port']
        #self.logger.info("packet-in %s" % (pkt,))
        pkt = packet.Packet(msg.data)
        eth = pkt.get_protocols(ethernet.ethernet)[0]

        if eth.ethertype == ether_types.ETH_TYPE_LLDP:
            #ignore lldp packet
            return
        dst = eth.dst
        src = eth.src
        
        for p in pkt:
            print p.protocol_name, p
            if p.protocol_name == 'vlan':
                print 'vid = ', p.vid
                vlaid = p.vid
        dpid = datapath.id
        self.mac_to_port.setdefault(dpid, {})
        buffer_id = msg.buffer_id 
        msgdata = msg.data
       
        self.logger.info("packet in %s %s %s %s %s %s", dpid, src, dst, in_port,  datapath, buffer_id)
        data = [src, dst]
        self.sendToC2(data)

    def sendToC2(self, y): 
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        host = socket.gethostname() # Get local machine name
        port = 12345                # Reserve a port for your service.
        s.connect((host, port))
        #data = json.dumps(x)
        data = jsonpickle.encode(y)
        s.sendall(data)
        print 'The data size is', len(data)
        #print s.recv(1024)
        s.close