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# -*- coding: utf-8 -*-
#
# (c) Copyright 2003-2015 HP Development Company, L.P.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
#
# Author: Don Welch
#

# Std Lib
import sys
import time
import socket
import select
import struct
import random
import re

# Local
from .g import *
from . import utils
from .sixext import to_bytes_utf8, to_unicode, to_string_utf8

prod_pat = re.compile(r"""\(\s*x-hp-prod_id\s*=\s*(.*?)\s*\)""", re.IGNORECASE)
mac_pat  = re.compile(r"""\(\s*x-hp-mac\s*=\s*(.*?)\s*\)""", re.IGNORECASE)
num_port_pat = re.compile(r"""\(\s*x-hp-num_port\s*=\s*(.*?)\s*\)""", re.IGNORECASE)
ip_pat =   re.compile(r"""\(\s*x-hp-ip\s*=\s*(.*?)\s*\)""", re.IGNORECASE)
p1_pat =   re.compile(r"""\(\s*x-hp-p1\s*=(?:\d\)|\s*(.*?)\s*\))""", re.IGNORECASE)
p2_pat =   re.compile(r"""\(\s*x-hp-p2\s*=(?:\d\)|\s*(.*?)\s*\))""", re.IGNORECASE)
p3_pat =   re.compile(r"""\(\s*x-hp-p3\s*=(?:\d\)|\s*(.*?)\s*\))""", re.IGNORECASE)
hn_pat =   re.compile(r"""\(\s*x-hp-hn\s*=\s*(.*?)\s*\)""", re.IGNORECASE)

def createSocketsWithsetOption(ttl=4):
    s=None
    
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        x = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        x.connect(('1.2.3.4', 56))
        intf = x.getsockname()[0]
        x.close()
        s.setblocking(0)
        ttl = struct.pack('B', ttl) 
    except socket.error:
        log.error("Network error")
        if s:
            s.close()
        return None
        
    try:
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    except (AttributeError, socket.error):
        pass

    try:
        s.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, ttl)
        s.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_IF, socket.inet_aton(intf) + socket.inet_aton('0.0.0.0'))
        s.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP ,1)
    except Exception as e:
        log.error("Unable to setup multicast socket for SLP: %s" % e)
        if s:
            s.close()
        return None
    return s


def detectNetworkDevices(ttl=4, timeout=10): #, xid=None, qappobj = None):
    mcast_addr, mcast_port ='224.0.1.60', 427
    found_devices = {}

    s = createSocketsWithsetOption(ttl)
    if not s:
        return {}

    packet = b''.join([to_bytes_utf8('\x01\x06\x00\x2c\x00\x00\x65\x6e\x00\x03'), 
        struct.pack('!H', random.randint(1, 65535)), to_bytes_utf8('\x00\x00\x00\x18service:x-hpnp-discover:\x00\x00\x00\x00')])

    try:
        s.sendto(packet, 0, (mcast_addr, mcast_port))
    except socket.error as e:
        log.error("Unable to send broadcast SLP packet: %s" % e)

    time_left = timeout
    while time_left > 0:
        start_time = time.time()
        r, w, e = select.select([s], [], [s], time_left)
        time_left -= (time.time() - start_time)
        if not r: continue

        data, addr = s.recvfrom(2048)
        update_spinner() 

        log.log_data(data, width=32)

        try:
            ver, func, length, flags, dialect, lang_code, char_encode, recv_xid, status_code, attr_length = \
                struct.unpack("!BBHBBHHHHH", data[:16])

            x = struct.unpack("!%ds" % attr_length, data[16:])[0].strip()
        except struct.error:
            continue
        x= to_string_utf8(x)
        try:
            num_ports = int(num_port_pat.search(x).group(1))
        except (AttributeError, ValueError):
            num_ports = 1

        if num_ports == 0: # Embedded devices
            num_ports = 1

        y = {'num_devices' : 0, 'num_ports': num_ports, 'product_id' : '', 
             'status_code': 0, 'device2': '0', 'device3': '0', 'note': '', 'device1': '0'}

        # Check port 1
        try:
            y['device1'] = p1_pat.search(x).group(1)
        except AttributeError:
            y['device1'] = '0'
        else:
            y['num_devices'] += 1


        if num_ports > 1: # Check port 2
            try:
                y['device2'] = p2_pat.search(x).group(1)
            except AttributeError:
                y['device2'] = '0'
            else:
                y['num_devices'] += 1


            if num_ports > 2: # Check port 3
                try:
                    y['device3'] = p3_pat.search(x).group(1)
                except AttributeError:
                    y['device3'] = '0'
                else:
                    y['num_devices'] += 1

        if y['device1'] is None:
            y['device1'] = '0'

        if y['device2'] is None:
            y['device2'] = '0'

        if y['device3'] is None:
            y['device3'] = '0'

        try:
            y['product_id'] = prod_pat.search(x).group(1)
        except AttributeError:
            y['product_id'] = ''
        try:
            y['mac'] = mac_pat.search(x).group(1)
        except AttributeError:
            y['mac'] = ''
        try:
            y['ip'] = ip_pat.search(x).group(1)
        except AttributeError:
            y['ip'] = ''
        try:
            y['hn'] = hn_pat.search(x).group(1)
        except AttributeError:
            y['hn'] = ''

        y['status_code'] = status_code
        found_devices[addr[0]] = y

        log.debug("Found device: %s" % y)

    s.close()
    return found_devices

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