# -*- mode: python; indent-tabs-mode: nil; py-indent-offset: 4; coding: utf-8 -*-

import os
import sys
import argparse
import re
import traceback
import logging
import shutil
import json
import socket
import select
from ctypes import *
import time, contextlib
import unittest
from random import Random
random = Random()

bHAVE_TORR = shutil.which('tor-resolve')

def bAreWeConnected():
    # FixMe: Linux only
    sFile = f"/proc/{os.getpid()}/net/route"
    if not os.path.isfile(sFile): return None
    i = 0
    for elt in open(sFile, "r").readlines():
        if elt.startswith('Iface'): continue
        if elt.startswith('lo'): continue
        i += 1
    return i > 0

def sMapaddressResolv(target, iPort=9051):
    if not stem:
        LOG.warn('please install the stem Python package')
        return ''

    try:
        controller = oGetStemController(log_level=10)

        map_dict = {"0.0.0.0": target}
        map_ret = controller.map_address(map_dict)

        return map_ret
    except Exception as e:
        LOG.exception(e)
    return ''

def lIntroductionPoints(target, iPort=9051):
    if stem == False: return ''
    from stem import StreamStatus
    from stem.control import EventType, Controller
    import getpass
    l = []
    try:
        controller = oGetStemController(log_level=10)
        desc = controller.get_hidden_service_descriptor(target)
        l = desc.introduction_points()
        if l:
            LOG.warn(f"{elt} NO introduction points for {target}\n")
            return l
        LOG.debug(f"{elt} len(l) introduction points for {target}")

        for introduction_point in l:
            l.append('%s:%s => %s' % (introduction_point.address,
                                    introduction_point.port,
                                    introduction_point.identifier))

    except Exception as e:
        LOG.exception(e)
    return l

def sTorResolve(target,
                verbose=False,
                sHost='127.0.0.1',
                iPort=9050,
                SOCK_TIMEOUT_SECONDS=10.0,
                SOCK_TIMEOUT_TRIES=3,
                ):
    MAX_INFO_RESPONSE_PACKET_LENGTH = 8
    
    seb = b"\o004\o360\o000\o000\o000\o000\o000\o001\o000"
    seb = b"\x04\xf0\x00\x00\x00\x00\x00\x01\x00"
    seb += bytes(target, 'US-ASCII') + b"\x00"
    assert len(seb) == 10+len(target), str(len(seb))+repr(seb)

#    LOG.debug(f"0 Sending {len(seb)} to The TOR proxy {seb}")

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((sHost, iPort))

    sock.settimeout(SOCK_TIMEOUT_SECONDS)
    oRet = sock.sendall(seb)

    i = 0
    data = ''
    while i < SOCK_TIMEOUT_TRIES:
        i += 1
        time.sleep(3)
        lReady = select.select([sock.fileno()], [], [],
                               SOCK_TIMEOUT_SECONDS)
        if not lReady[0]: continue
        try:
            flags=socket.MSG_WAITALL
            data = sock.recv(MAX_INFO_RESPONSE_PACKET_LENGTH, flags)
        except socket.timeout:
            LOG.warn("4 The TOR proxy " \
                +repr((sHost, iPort)) \
                +" didnt reply in " + str(SOCK_TIMEOUT_SECONDS) + " sec."
                +" #" +str(i))
        except Exception as e:
            LOG.error("4 The TOR proxy " \
                +repr((sHost, iPort)) \
                +" errored with " + str(e)
                +" #" +str(i))
            sock.close()
            raise SystemExit(4)
        else:
            if len(data) > 0: break

    if len(data) == 0:
        if i > SOCK_TIMEOUT_TRIES:
            sLabel = "5 No reply #"
        else:
            sLabel = "5 No data #"
        LOG.info(sLabel +f"{i} from {sHost} {iPort}" )
        sock.close()
        raise SystemExit(5)
    
    assert len(data) >= 8
    packet_sf = data[1]
    if packet_sf == 90:
        # , "%d" % packet_sf
        assert f"{packet_sf}" == "90", f"packet_sf = {packet_sf}"
        return f"{data[4]}.{data[5]}.{data[6]}.{data[7]}"
    else:
        # 91
        LOG.warn(f"tor-resolve failed for {target} from {sHost} {iPort}" )

    os.system(f"tor-resolve -4 {target} > /tmp/e 2>/dev/null")
#    os.system("strace tor-resolve -4 "+target+" 2>&1|grep '^sen\|^rec'")

    return ''
    
def getaddrinfo(sHost, sPort):
    # do this the explicit way = Ive seen the compact connect fail
    # >>> sHost, sPort = 'l27.0.0.1', 33446
    # >>> sock.connect((sHost, sPort))
    # socket.gaierror: [Errno -2] Name or service not known
    try:
        lElts = socket.getaddrinfo(sHost, int(sPort), socket.AF_INET)
        lElts = list(filter(lambda elt: elt[1] == socket.SOCK_DGRAM, lElts))
        assert len(lElts) == 1, repr(lElts)
        lPair = lElts[0][-1]
        assert len(lPair) == 2, repr(lPair)
        assert type(lPair[1]) == int, repr(lPair)
    except Exception as e:
        LOG.exception(e)
        return None
    return lPair