#!/usr/bin/python2.7
# Copyright (c) 2012-2016 Jonathan Warren
# Copyright (c) 2012-2016 The Bitmessage developers
# Distributed under the MIT/X11 software license. See the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.

# Right now, PyBitmessage only support connecting to stream 1. It doesn't
# yet contain logic to expand into further streams.

# The software version variable is now held in shared.py

import depends
depends.check_dependencies()

import signal  # Used to capture a Ctrl-C keypress so that Bitmessage can shutdown gracefully.
# The next 3 are used for the API
from singleinstance import singleinstance
import os
import socket
import ctypes
from struct import pack
import sys
from subprocess import call
import time

from api import MySimpleXMLRPCRequestHandler, StoppableXMLRPCServer
from helper_startup import isOurOperatingSystemLimitedToHavingVeryFewHalfOpenConnections

import shared
from helper_sql import sqlQuery
import state
import threading

# Classes
from class_sqlThread import sqlThread
from class_singleCleaner import singleCleaner
from class_objectProcessor import objectProcessor
from class_outgoingSynSender import outgoingSynSender
from class_singleListener import singleListener
from class_singleWorker import singleWorker
from class_addressGenerator import addressGenerator
from class_smtpDeliver import smtpDeliver
from class_smtpServer import smtpServer
from configparser import BMConfigParser
from debug import logger

# Helper Functions
import helper_bootstrap
import helper_generic
from helper_threading import *

def connectToStream(streamNumber):
    state.streamsInWhichIAmParticipating[streamNumber] = 'no data'
    selfInitiatedConnections[streamNumber] = {}

    if isOurOperatingSystemLimitedToHavingVeryFewHalfOpenConnections():
        # Some XP and Vista systems can only have 10 outgoing connections at a time.
        maximumNumberOfHalfOpenConnections = 9
    else:
        maximumNumberOfHalfOpenConnections = 64
    try:
        # don't overload Tor
        if BMConfigParser().get('bitmessagesettings', 'socksproxytype') != 'none':
            maximumNumberOfHalfOpenConnections = 4
    except:
        pass
    for i in range(maximumNumberOfHalfOpenConnections):
        a = outgoingSynSender()
        a.setup(streamNumber, selfInitiatedConnections)
        a.start()

def _fixWinsock():
    if not ('win32' in sys.platform) and not ('win64' in sys.platform):
        return

    # Python 2 on Windows doesn't define a wrapper for
    # socket.inet_ntop but we can make one ourselves using ctypes
    if not hasattr(socket, 'inet_ntop'):
        addressToString = ctypes.windll.ws2_32.WSAAddressToStringA
        def inet_ntop(family, host):
            if family == socket.AF_INET:
                if len(host) != 4:
                    raise ValueError("invalid IPv4 host")
                host = pack("hH4s8s", socket.AF_INET, 0, host, "\0" * 8)
            elif family == socket.AF_INET6:
                if len(host) != 16:
                    raise ValueError("invalid IPv6 host")
                host = pack("hHL16sL", socket.AF_INET6, 0, 0, host, 0)
            else:
                raise ValueError("invalid address family")
            buf = "\0" * 64
            lengthBuf = pack("I", len(buf))
            addressToString(host, len(host), None, buf, lengthBuf)
            return buf[0:buf.index("\0")]
        socket.inet_ntop = inet_ntop

    # Same for inet_pton
    if not hasattr(socket, 'inet_pton'):
        stringToAddress = ctypes.windll.ws2_32.WSAStringToAddressA
        def inet_pton(family, host):
            buf = "\0" * 28
            lengthBuf = pack("I", len(buf))
            if stringToAddress(str(host),
                               int(family),
                               None,
                               buf,
                               lengthBuf) != 0:
                raise socket.error("illegal IP address passed to inet_pton")
            if family == socket.AF_INET:
                return buf[4:8]
            elif family == socket.AF_INET6:
                return buf[8:24]
            else:
                raise ValueError("invalid address family")
        socket.inet_pton = inet_pton

    # These sockopts are needed on for IPv6 support
    if not hasattr(socket, 'IPPROTO_IPV6'):
        socket.IPPROTO_IPV6 = 41
    if not hasattr(socket, 'IPV6_V6ONLY'):
        socket.IPV6_V6ONLY = 27

# This thread, of which there is only one, runs the API.
class singleAPI(threading.Thread, StoppableThread):
    def __init__(self):
        threading.Thread.__init__(self, name="singleAPI")
        self.initStop()
        
    def stopThread(self):
        super(singleAPI, self).stopThread()
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        try:
            s.connect((BMConfigParser().get('bitmessagesettings', 'apiinterface'), BMConfigParser().getint(
                'bitmessagesettings', 'apiport')))
            s.shutdown(socket.SHUT_RDWR)
            s.close()
        except:
            pass

    def run(self):
        se = StoppableXMLRPCServer((BMConfigParser().get('bitmessagesettings', 'apiinterface'), BMConfigParser().getint(
            'bitmessagesettings', 'apiport')), MySimpleXMLRPCRequestHandler, True, True)
        se.register_introspection_functions()
        se.serve_forever()

# This is a list of current connections (the thread pointers at least)
selfInitiatedConnections = {}

if shared.useVeryEasyProofOfWorkForTesting:
    protocol.networkDefaultProofOfWorkNonceTrialsPerByte = int(
        protocol.networkDefaultProofOfWorkNonceTrialsPerByte / 100)
    protocol.networkDefaultPayloadLengthExtraBytes = int(
        protocol.networkDefaultPayloadLengthExtraBytes / 100)

class Main:
    def start(self, daemon=False):
        _fixWinsock()

        shared.daemon = daemon

        # get curses flag
        shared.curses = False
        if '-c' in sys.argv:
            shared.curses = True

        # is the application already running?  If yes then exit.
        shared.thisapp = singleinstance("", daemon)

        if daemon:
            with shared.printLock:
                print('Running as a daemon. Send TERM signal to end.')
            self.daemonize()

        self.setSignalHandler()

        helper_bootstrap.knownNodes()
        # Start the address generation thread
        addressGeneratorThread = addressGenerator()
        addressGeneratorThread.daemon = True  # close the main program even if there are threads left
        addressGeneratorThread.start()

        # Start the thread that calculates POWs
        singleWorkerThread = singleWorker()
        singleWorkerThread.daemon = True  # close the main program even if there are threads left
        singleWorkerThread.start()

        # Start the SQL thread
        sqlLookup = sqlThread()
        sqlLookup.daemon = False  # DON'T close the main program even if there are threads left. The closeEvent should command this thread to exit gracefully.
        sqlLookup.start()

        # SMTP delivery thread
        if daemon and BMConfigParser().safeGet("bitmessagesettings", "smtpdeliver", '') != '':
            smtpDeliveryThread = smtpDeliver()
            smtpDeliveryThread.start()

        # SMTP daemon thread
        if daemon and BMConfigParser().safeGetBoolean("bitmessagesettings", "smtpd"):
            smtpServerThread = smtpServer()
            smtpServerThread.start()

        # Start the thread that calculates POWs
        objectProcessorThread = objectProcessor()
        objectProcessorThread.daemon = False  # DON'T close the main program even the thread remains. This thread checks the shutdown variable after processing each object.
        objectProcessorThread.start()

        # Start the cleanerThread
        singleCleanerThread = singleCleaner()
        singleCleanerThread.daemon = True  # close the main program even if there are threads left
        singleCleanerThread.start()

        shared.reloadMyAddressHashes()
        shared.reloadBroadcastSendersForWhichImWatching()

        if BMConfigParser().safeGetBoolean('bitmessagesettings', 'apienabled'):
            try:
                apiNotifyPath = BMConfigParser().get(
                    'bitmessagesettings', 'apinotifypath')
            except:
                apiNotifyPath = ''
            if apiNotifyPath != '':
                with shared.printLock:
                    print('Trying to call', apiNotifyPath)

                call([apiNotifyPath, "startingUp"])
            singleAPIThread = singleAPI()
            singleAPIThread.daemon = True  # close the main program even if there are threads left
            singleAPIThread.start()

        connectToStream(1)

        singleListenerThread = singleListener()
        singleListenerThread.setup(selfInitiatedConnections)
        singleListenerThread.daemon = True  # close the main program even if there are threads left
        singleListenerThread.start()
        
        if BMConfigParser().safeGetBoolean('bitmessagesettings','upnp'):
            import upnp
            upnpThread = upnp.uPnPThread()
            upnpThread.start()

        if daemon == False and BMConfigParser().safeGetBoolean('bitmessagesettings', 'daemon') == False:
            if shared.curses == False:
                if not depends.check_pyqt():
                    print('PyBitmessage requires PyQt unless you want to run it as a daemon and interact with it using the API. You can download PyQt from http://www.riverbankcomputing.com/software/pyqt/download   or by searching Google for \'PyQt Download\'. If you want to run in daemon mode, see https://bitmessage.org/wiki/Daemon')
                    print('You can also run PyBitmessage with the new curses interface by providing \'-c\' as a commandline argument.')
                    sys.exit()

                import bitmessageqt
                bitmessageqt.run()
            else:
                if True:
#                if depends.check_curses():
                    print('Running with curses')
                    import bitmessagecurses
                    bitmessagecurses.runwrapper()
        else:
            BMConfigParser().remove_option('bitmessagesettings', 'dontconnect')

            while True:
                time.sleep(20)

    def daemonize(self):
        if os.fork():
            exit(0)
        shared.thisapp.lock() # relock
        os.umask(0)
        os.setsid()
        if os.fork():
            exit(0)
        shared.thisapp.lock() # relock
        shared.thisapp.lockPid = None # indicate we're the final child
        sys.stdout.flush()
        sys.stderr.flush()
        si = file('/dev/null', 'r')
        so = file('/dev/null', 'a+')
        se = file('/dev/null', 'a+', 0)
        os.dup2(si.fileno(), sys.stdin.fileno())
        os.dup2(so.fileno(), sys.stdout.fileno())
        os.dup2(se.fileno(), sys.stderr.fileno())

    def setSignalHandler(self):
        signal.signal(signal.SIGINT, helper_generic.signal_handler)
        signal.signal(signal.SIGTERM, helper_generic.signal_handler)
        # signal.signal(signal.SIGINT, signal.SIG_DFL)

    def stop(self):
        with shared.printLock:
            print('Stopping Bitmessage Deamon.')
        shared.doCleanShutdown()


    #TODO: nice function but no one is using this 
    def getApiAddress(self):
        if not BMConfigParser().safeGetBoolean('bitmessagesettings', 'apienabled'):
            return None
        address = BMConfigParser().get('bitmessagesettings', 'apiinterface')
        port = BMConfigParser().getint('bitmessagesettings', 'apiport')
        return {'address':address,'port':port}

if __name__ == "__main__":
    mainprogram = Main()
    mainprogram.start(BMConfigParser().safeGetBoolean('bitmessagesettings', 'daemon'))


# So far, the creation of and management of the Bitmessage protocol and this
# client is a one-man operation. Bitcoin tips are quite appreciated.
# 1H5XaDA6fYENLbknwZyjiYXYPQaFjjLX2u