#!/usr/bin/env python3
'''
    Onionr - P2P Microblogging Platform & Social network.

    Onionr is the name for both the protocol and the original/reference software.

    Run with 'help' for usage.
'''
'''
    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/>.
'''

import sys, os, base64, random, getpass, shutil, subprocess, requests, time, platform, datetime, re
import api, core, config, logger, onionrplugins as plugins, onionrevents as events
from onionrutils import OnionrUtils
from netcontroller import NetController

try:
    from urllib3.contrib.socks import SOCKSProxyManager
except ImportError:
    raise Exception("You need the PySocks module (for use with socks5 proxy to use Tor)")

try:
    import gui
except ImportError:
    logger.error('You need python3 tkinter and tk installed to use Onionr.')
    sys.exit(1)

ONIONR_TAGLINE = 'Anonymous P2P Platform - GPLv3 - https://Onionr.VoidNet.Tech'
ONIONR_VERSION = '0.0.0' # for debugging and stuff
API_VERSION = '1' # increments of 1; only change when something fundemental about how the API works changes. This way other nodes knows how to communicate without learning too much information about you.

class Onionr:
    def __init__(self):
        '''
            Main Onionr class. This is for the CLI program, and does not handle much of the logic.
            In general, external programs and plugins should not use this class.
        '''

        try:
            os.chdir(sys.path[0])
        except FileNotFoundError:
            pass

        # Load global configuration data

        data_exists = os.path.exists('data/')

        if not data_exists:
            os.mkdir('data/')

        exists = os.path.exists(config.get_config_file())
        config.set_config({'devmode': True, 'log': {'file': {'output': True, 'path': 'data/output.log'}, 'console': {'output': True, 'color': True}}}) # this is the default config, it will be overwritten if a config file already exists. Else, it saves it
        if not exists:
            config.save()
        config.reload() # this will read the configuration file into memory

        settings = 0b000
        if config.get('log', {'console': {'color': True}})['console']['color']:
            settings = settings | logger.USE_ANSI
        if config.get('log', {'console': {'output': True}})['console']['output']:
            settings = settings | logger.OUTPUT_TO_CONSOLE
        if config.get('log', {'file': {'output': True}})['file']['output']:
            settings = settings | logger.OUTPUT_TO_FILE
            logger.set_file(config.get('log', {'file': {'path': 'data/output.log'}})['file']['path'])
        logger.set_settings(settings)

        if str(config.get('devmode', True)).lower() == 'true':
            self._developmentMode = True
            logger.set_level(logger.LEVEL_DEBUG)
        else:
            self._developmentMode = False
            logger.set_level(logger.LEVEL_INFO)

        self.onionrCore = core.Core()
        self.onionrUtils = OnionrUtils(self.onionrCore)

        # Handle commands

        self.debug = False # Whole application debugging

        if os.path.exists('data-encrypted.dat'):
            while True:
                print('Enter password to decrypt:')
                password = getpass.getpass()
                result = self.onionrCore.dataDirDecrypt(password)
                if os.path.exists('data/'):
                    break
                else:
                    logger.error('Failed to decrypt: ' + result[1], timestamp = False)
        else:
            # If data folder does not exist
            if not data_exists:
                if not os.path.exists('data/blocks/'):
                    os.mkdir('data/blocks/')

                # Copy default plugins into plugins folder
                if os.path.exists('default-plugins/'):
                    names = [f for f in os.listdir("default-plugins/") if not os.path.isfile(f)]
                    shutil.copytree('default-plugins/', 'data/plugins/')

                    # Enable plugins
                    for name in names:
                        plugins.enable(name, self)

        if not os.path.exists(self.onionrCore.peerDB):
            self.onionrCore.createPeerDB()
            pass
        if not os.path.exists(self.onionrCore.addressDB):
            self.onionrCore.createAddressDB()

        # Get configuration

        if not exists:
            # Generate default config
            # Hostname should only be set if different from 127.x.x.x. Important for DNS rebinding attack prevention.
            if self.debug:
                randomPort = 8080
            else:
                while True:
                    randomPort = random.randint(1024, 65535)
                    if self.onionrUtils.checkPort(randomPort):
                        break
            config.set('client', {'participate': 'true', 'client_hmac': base64.b16encode(os.urandom(32)).decode('utf-8'), 'port': randomPort, 'api_version': API_VERSION}, True)

        self.cmds = {
            '': self.showHelpSuggestion,
            'help': self.showHelp,
            'version': self.version,
            'config': self.configure,
            'start': self.start,
            'stop': self.killDaemon,
            'stats': self.showStats,

            'enable-plugin': self.enablePlugin,
            'enplugin': self.enablePlugin,
            'enableplugin': self.enablePlugin,
            'enmod': self.enablePlugin,
            'disable-plugin': self.disablePlugin,
            'displugin': self.disablePlugin,
            'disableplugin': self.disablePlugin,
            'dismod': self.disablePlugin,
            'reload-plugin': self.reloadPlugin,
            'reloadplugin': self.reloadPlugin,
            'reload-plugins': self.reloadPlugin,
            'reloadplugins': self.reloadPlugin,
            'create-plugin': self.createPlugin,
            'createplugin': self.createPlugin,
            'plugin-create': self.createPlugin,

            'listkeys': self.listKeys,
            'list-keys': self.listKeys,

            'addmsg': self.addMessage,
            'addmessage': self.addMessage,
            'add-msg': self.addMessage,
            'add-message': self.addMessage,
            'pm': self.sendEncrypt,

            'getpms': self.getPMs,
            'get-pms': self.getPMs,

            'gui': self.openGUI,

            'addpeer': self.addPeer,
            'add-peer': self.addPeer,
            'add-address': self.addAddress,
            'add-addr': self.addAddress,
            'addaddr': self.addAddress,
            'addaddress': self.addAddress,

            'introduce': self.onionrCore.introduceNode,
            'connect': self.addAddress
        }

        self.cmdhelp = {
            'help': 'Displays this Onionr help menu',
            'version': 'Displays the Onionr version',
            'config': 'Configures something and adds it to the file',
            'start': 'Starts the Onionr daemon',
            'stop': 'Stops the Onionr daemon',
            'stats': 'Displays node statistics',
            'enable-plugin': 'Enables and starts a plugin',
            'disable-plugin': 'Disables and stops a plugin',
            'reload-plugin': 'Reloads a plugin',
            'create-plugin': 'Creates directory structure for a plugin',
            'add-peer': 'Adds a peer (?)',
            'list-peers': 'Displays a list of peers',
            'add-msg': 'Broadcasts a message to the Onionr network',
            'pm': 'Adds a private message to block',
            'get-pms': 'Shows private messages sent to you',
            'gui': 'Opens a graphical interface for Onionr',
            'introduce': 'Introduce your node to the public Onionr network (DAEMON MUST BE RUNNING)',
        }

        # initialize plugins
        events.event('init', onionr = self)

        command = ''
        try:
            command = sys.argv[1].lower()
        except IndexError:
            command = ''
        finally:
            self.execute(command)

        if not self._developmentMode:
            encryptionPassword = self.onionrUtils.getPassword('Enter password to encrypt directory: ')
            self.onionrCore.dataDirEncrypt(encryptionPassword)
            shutil.rmtree('data/')

        return

    '''
        THIS SECTION HANDLES THE COMMANDS
    '''

    def getCommands(self):
        return self.cmds

    def getHelp(self):
        return self.cmdhelp

    def addCommand(self, command, function):
        self.cmds[str(command).lower()] = function

    def addHelp(self, command, description):
        self.cmdhelp[str(command).lower()] = str(description)

    def delCommand(self, command):
        return self.cmds.pop(str(command).lower(), None)

    def delHelp(self, command):
        return self.cmdhelp.pop(str(command).lower(), None)

    def configure(self):
        '''
            Displays something from the configuration file, or sets it
        '''

        if len(sys.argv) >= 4:
            config.reload()
            config.set(sys.argv[2], sys.argv[3], True)
            logger.debug('Configuration file updated.')
        elif len(sys.argv) >= 3:
            config.reload()
            logger.info(logger.colors.bold + sys.argv[2] + ': ' + logger.colors.reset + str(config.get(sys.argv[2], logger.colors.fg.red + 'Not set.')))
        else:
            logger.info(logger.colors.bold + 'Get a value: ' + logger.colors.reset + sys.argv[0] + ' ' + sys.argv[1] + ' <key>')
            logger.info(logger.colors.bold + 'Set a value: ' + logger.colors.reset + sys.argv[0] + ' ' + sys.argv[1] + ' <key> <value>')


    def execute(self, argument):
        '''
            Executes a command
        '''

        argument = argument[argument.startswith('--') and len('--'):] # remove -- if it starts with it

        # define commands
        commands = self.getCommands()

        command = commands.get(argument, self.notFound)
        command()

        return

    '''
        THIS SECTION DEFINES THE COMMANDS
    '''

    def version(self, verbosity=5):
        '''
            Displays the Onionr version
        '''

        logger.info('Onionr ' + ONIONR_VERSION + ' (' + platform.machine() + ') - API v' + API_VERSION)
        if verbosity >= 1:
            logger.info(ONIONR_TAGLINE)
        if verbosity >= 2:
            logger.info('Running on ' + platform.platform() + ' ' + platform.release())

        return

    def sendEncrypt(self):
        '''
            Create a private message and send it
        '''

        invalidID = True
        while invalidID:
            try:
                peer = logger.readline('Peer to send to: ')
            except KeyboardInterrupt:
                break
            else:
                if self.onionrUtils.validatePubKey(peer):
                    invalidID = False
                else:
                    logger.error('Invalid peer ID')
        else:
            try:
                message = logger.readline("Enter a message: ")
            except KeyboardInterrupt:
                pass
            else:
                logger.info("Sending message to " + peer)
                self.onionrUtils.sendPM(peer, message)


    def openGUI(self):
        '''
            Opens a graphical interface for Onionr
        '''

        gui.OnionrGUI(self.onionrCore)

    def listKeys(self):
        '''
            Displays a list of keys (used to be called peers) (?)
        '''

        logger.info('Public keys in database:\n')
        for i in self.onionrCore.listPeers():
            logger.info(i)

    def addPeer(self):
        '''
            Adds a peer (?)
        '''

        try:
            newPeer = sys.argv[2]
        except:
            pass
        else:
            logger.info("Adding peer: " + logger.colors.underline + newPeer)
            self.onionrCore.addPeer(newPeer)

        return

    def addAddress(self):
        '''
            Adds a Onionr node address
        '''
        try:
            newAddress = sys.argv[2]
        except:
            pass
        else:
            logger.info("Adding address: " + logger.colors.underline + newAddress)
            if self.onionrCore.addAddress(newAddress):
                logger.info("Successfully added address.")
            else:
                logger.warn("Unable to add address.")

        return

    def addMessage(self, header="txt"):
        '''
            Broadcasts a message to the Onionr network
        '''

        while True:

            messageToAdd = '-txt-' + logger.readline('Broadcast message to network: ')
            if len(messageToAdd) - 5 >= 1:
                break

        addedHash = self.onionrCore.setData(messageToAdd)
        self.onionrCore.addToBlockDB(addedHash, selfInsert=True)
        self.onionrCore.setBlockType(addedHash, 'txt')

        return

    def getPMs(self):
        '''
            display PMs sent to us
        '''
        self.onionrUtils.loadPMs()

    def enablePlugin(self):
        '''
            Enables and starts the given plugin
        '''

        if len(sys.argv) >= 3:
            plugin_name = sys.argv[2]
            logger.info('Enabling plugin \"' + plugin_name + '\"...')
            plugins.enable(plugin_name, self)
        else:
            logger.info(sys.argv[0] + ' ' + sys.argv[1] + ' <plugin>')

        return

    def disablePlugin(self):
        '''
            Disables and stops the given plugin
        '''

        if len(sys.argv) >= 3:
            plugin_name = sys.argv[2]
            logger.info('Disabling plugin \"' + plugin_name + '\"...')
            plugins.disable(plugin_name, self)
        else:
            logger.info(sys.argv[0] + ' ' + sys.argv[1] + ' <plugin>')

        return

    def reloadPlugin(self):
        '''
            Reloads (stops and starts) all plugins, or the given plugin
        '''

        if len(sys.argv) >= 3:
            plugin_name = sys.argv[2]
            logger.info('Reloading plugin \"' + plugin_name + '\"...')
            plugins.stop(plugin_name, self)
            plugins.start(plugin_name, self)
        else:
            logger.info('Reloading all plugins...')
            plugins.reload(self)

        return

    def createPlugin(self):
        '''
            Creates the directory structure for a plugin name
        '''

        if len(sys.argv) >= 3:
            try:
                plugin_name = re.sub('[^0-9a-zA-Z]+', '', str(sys.argv[2]).lower())

                if not plugins.exists(plugin_name):
                    logger.info('Creating plugin \"' + plugin_name + '\"...')

                    os.makedirs(plugins.get_plugins_folder(plugin_name))
                    with open(plugins.get_plugins_folder(plugin_name) + '/main.py', 'a') as main:
                        main.write(open('default_plugin.txt').read().replace('$user', os.getlogin()).replace('$date', datetime.datetime.now().strftime('%Y-%m-%d')))

                    logger.info('Enabling plugin \"' + plugin_name + '\"...')
                    plugins.enable(plugin_name, self)
                else:
                    logger.warn('Cannot create plugin directory structure; plugin "' + plugin_name + '" exists.')

            except Exception as e:
                logger.error('Failed to create plugin directory structure.', e)
        else:
            logger.info(sys.argv[0] + ' ' + sys.argv[1] + ' <plugin>')

        return

    def notFound(self):
        '''
            Displays a "command not found" message
        '''

        logger.error('Command not found.', timestamp = False)

    def showHelpSuggestion(self):
        '''
            Displays a message suggesting help
        '''

        logger.info('Do ' + logger.colors.bold + sys.argv[0] + ' --help' + logger.colors.reset + logger.colors.fg.green + ' for Onionr help.')

    def start(self):
        '''
            Starts the Onionr daemon
        '''

        if os.path.exists('.onionr-lock'):
            logger.fatal('Cannot start. Daemon is already running, or it did not exit cleanly.\n(if you are sure that there is not a daemon running, delete .onionr-lock & try again).')
        else:
            if not self.debug and not self._developmentMode:
                lockFile = open('.onionr-lock', 'w')
                lockFile.write('')
                lockFile.close()
            self.daemon()
            if not self.debug and not self._developmentMode:
                os.remove('.onionr-lock')

    def daemon(self):
        '''
            Starts the Onionr communication daemon
        '''

        if not os.environ.get("WERKZEUG_RUN_MAIN") == "true":
            if self._developmentMode:
                logger.warn('DEVELOPMENT MODE ENABLED (THIS IS LESS SECURE!)')
            net = NetController(config.get('client')['port'])
            logger.info('Tor is starting...')
            if not net.startTor():
                sys.exit(1)
            logger.info('Started Tor .onion service: ' + logger.colors.underline + net.myID)
            logger.info('Our Public key: ' + self.onionrCore._crypto.pubKey)
            time.sleep(1)
            subprocess.Popen(["./communicator.py", "run", str(net.socksPort)])
            logger.debug('Started communicator')
            events.event('daemon_start', onionr = self)
        api.API(self.debug)

        return

    def killDaemon(self):
        '''
            Shutdown the Onionr daemon
        '''

        logger.warn('Killing the running daemon')
        events.event('daemon_stop', onionr = self)
        net = NetController(config.get('client')['port'])
        try:
            self.onionrUtils.localCommand('shutdown')
        except requests.exceptions.ConnectionError:
            pass
        self.onionrCore.daemonQueueAdd('shutdown')
        net.killTor()

        return

    def showStats(self):
        '''
            Displays statistics and exits
        '''

        return

    def showHelp(self, command = None):
        '''
            Show help for Onionr
        '''

        helpmenu = self.getHelp()

        if command is None and len(sys.argv) >= 3:
            for cmd in sys.argv[2:]:
                self.showHelp(cmd)
        elif not command is None:
            if command.lower() in helpmenu:
                logger.info(logger.colors.bold + command  + logger.colors.reset + logger.colors.fg.blue + ' : ' + logger.colors.reset +  helpmenu[command.lower()])
            else:
                logger.warn(logger.colors.bold + command  + logger.colors.reset + logger.colors.fg.blue + ' : ' + logger.colors.reset + 'No help menu entry was found')
        else:
            self.version(0)
            for command, helpmessage in helpmenu.items():
                self.showHelp(command)
        return

Onionr()