"""
    Onionr - Private P2P Communication

    Netcontroller library, used to control/work with Tor and send requests through them
"""
import os
import base64
import subprocess
import signal
import time
import multiprocessing
import platform  # For windows sigkill workaround

from onionrtypes import BooleanSuccessState
import logger
from .. import getopenport
from .. import watchdog
from . import customtorrc
from . import gentorrc
from . import addbridges
from . import torbinary
from utils import identifyhome
"""
    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 3 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, see <https://www.gnu.org/licenses/>.
"""

TOR_KILL_WAIT = 3
addbridges = addbridges.add_bridges


class NetController:
    """
        This class handles hidden service setup on Tor
    """

    def __init__(self, hsPort, apiServerIP='127.0.0.1'):
        # set data dir
        self.dataDir = identifyhome.identify_home()
        self.socksPort = getopenport.get_open_port()
        self.torConfigLocation = self.dataDir + 'torrc'
        self.readyState = False
        self.hsPort = hsPort
        self._torInstnace = ''
        self.myID = ''
        self.apiServerIP = apiServerIP
        self.torBinary = torbinary.tor_binary()

    def startTor(self, gen_torrc=True) -> BooleanSuccessState:
        """
            Start Tor with onion service on port 80 & socks proxy on random port
        """
        if gen_torrc:
            gentorrc.generate_torrc(self, self.apiServerIP)

        if os.path.exists('./tor'):
            self.torBinary = './tor'
        elif os.path.exists('/usr/bin/tor'):
            self.torBinary = '/usr/bin/tor'
        else:
            self.torBinary = 'tor'

        try:
            tor = subprocess.Popen([self.torBinary, '-f', self.torConfigLocation], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        except FileNotFoundError:
            logger.fatal("Tor was not found in your path or the Onionr directory. Please install Tor and try again.", terminal=True)
            return False
        else:
            # Test Tor Version
            torVersion = subprocess.Popen([self.torBinary, '--version'],
                                          stdout=subprocess.PIPE,
                                          stderr=subprocess.PIPE)
            for line in iter(torVersion.stdout.readline, b''):
                if 'Tor 0.2.' in line.decode():
                    logger.fatal('Tor 0.3+ required', terminal=True)
                    return False
            torVersion.kill()

        # wait for tor to get to 100% bootstrap
        try:
            for line in iter(tor.stdout.readline, b''):
                if 'bootstrapped 100' in line.decode().lower():
                    logger.info(line.decode())
                    break
                elif 'opening socks listener' in line.decode().lower():
                    logger.debug(line.decode().replace('\n', ''))
                else:
                    if 'err' in line.decode():
                        logger.error(line.decode().replace('\n', ''))
                    elif 'warn' in line.decode():
                        logger.warn(line.decode().replace('\n', ''))
                    else:
                        logger.debug(line.decode().replace('\n', ''))
            else:
                logger.fatal('Failed to start Tor. Maybe a stray instance of Tor used by Onionr is still running? This can also be a result of file permissions being too open', terminal=True)
                return False
        except KeyboardInterrupt:
            logger.fatal('Got keyboard interrupt. Onionr will exit soon.', timestamp = False, terminal=True)
            return False

        logger.info('Finished starting Tor.', terminal=True)

        self.readyState = True

        try:
            myID = open(self.dataDir + 'hs/hostname', 'r')
            self.myID = myID.read().replace('\n', '')
            myID.close()
        except FileNotFoundError:
            self.myID = ""

        with open(self.dataDir + 'torPid.txt', 'w') as tor_pid_file:
            tor_pid_file.write(str(tor.pid))

        multiprocessing.Process(target=watchdog.watchdog,
                                args=[os.getpid(), tor.pid]).start()
        return True

    def killTor(self):
        """
            Properly kill tor based on pid saved to file
        """

        try:
            pid = open(self.dataDir + 'torPid.txt', 'r')
            pidN = pid.read()
            pid.close()
        except FileNotFoundError:
            return

        try:
            int(pidN)
        except ValueError:
            return

        try:
            try:
                os.kill(int(pidN), signal.SIGTERM)
            except PermissionError:
                # seems to happen on win 10
                pass
            os.remove(self.dataDir + 'torPid.txt')
        except ProcessLookupError:
            pass
        except FileNotFoundError:
            pass

        try:
            time.sleep(TOR_KILL_WAIT)
        except KeyboardInterrupt:
            pass

        if 'windows' == platform.system().lower():
            os.system(f'taskkill /PID {pidN} /F')
            time.sleep(0.5)
            return
        try:
            os.kill(int(pidN), signal.SIGKILL)
        except (ProcessLookupError, PermissionError):
            pass
        try:
            os.remove(self.dataDir + 'tordata/lock')
        except FileNotFoundError:
            pass