#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2011 thomasv@gitorious
#
# 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 <http://www.gnu.org/licenses/>.

import os
import sys
import datetime
import time
import copy
import argparse
import json
import ast
import base64
from functools import wraps
from decimal import Decimal

import util
from util import print_msg, format_satoshis, print_stderr
import bitcoin
from bitcoin import is_address, hash_160_to_bc_address, hash_160, COIN
from transaction import Transaction
import paymentrequest
from paymentrequest import PR_PAID, PR_UNPAID, PR_UNKNOWN, PR_EXPIRED
import contacts

known_commands = {}

class Command:

    def __init__(self, func, s):
        self.name = func.__name__
        self.requires_network = 'n' in s
        self.requires_wallet = 'w' in s
        self.requires_password = 'p' in s
        self.description = func.__doc__
        self.help = self.description.split('.')[0] if self.description else None
        varnames = func.func_code.co_varnames[1:func.func_code.co_argcount]
        self.defaults = func.func_defaults
        if self.defaults:
            n = len(self.defaults)
            self.params = list(varnames[:-n])
            self.options = list(varnames[-n:])
        else:
            self.params = list(varnames)
            self.options = []
            self.defaults = []


def command(s):
    def decorator(func):
        global known_commands
        name = func.__name__
        known_commands[name] = Command(func, s)
        @wraps(func)
        def func_wrapper(*args, **kwargs):
            return func(*args, **kwargs)
        return func_wrapper
    return decorator


class Commands:

    def __init__(self, config, wallet, network, callback = None):
        self.config = config
        self.wallet = wallet
        self.network = network
        self._callback = callback
        self.password = None
        self.contacts = contacts.Contacts(self.config)

    def _run(self, method, args, password_getter):
        cmd = known_commands[method]
        if cmd.requires_password and self.wallet.use_encryption:
            self.password = apply(password_getter,())
        f = getattr(self, method)
        result = f(*args)
        self.password = None
        if self._callback:
            apply(self._callback, ())
        return result

    @command('')
    def commands(self):
        """List of commands"""
        return ' '.join(sorted(known_commands.keys()))

    @command('')
    def create(self):
        """Create a new wallet"""
        raise BaseException('Not a JSON-RPC command')

    @command('wn')
    def restore(self, text):
        """Restore a wallet from text. Text can be a seed phrase, a master
        public key, a master private key, a list of bitcoin addresses
        or bitcoin private keys. If you want to be prompted for your
        seed, type '?' or ':' (concealed) """
        raise BaseException('Not a JSON-RPC command')

    @command('w')
    def deseed(self):
        """Remove seed from wallet. This creates a seedless, watching-only
        wallet."""
        raise BaseException('Not a JSON-RPC command')

    @command('wp')
    def password(self):
        """Change wallet password. """
        raise BaseException('Not a JSON-RPC command')

    @command('')
    def getconfig(self, key):
        """Return a configuration variable. """
        return self.config.get(key)

    @command('')
    def setconfig(self, key, value):
        """Set a configuration variable. 'value' may be a string or a Python expression."""
        try:
            value = ast.literal_eval(value)
        except:
            pass
        self.config.set_key(key, value)
        return True

    @command('')
    def make_seed(self, nbits=128, entropy=1, language=None):
        """Create a seed"""
        from mnemonic import Mnemonic
        s = Mnemonic(language).make_seed(nbits, custom_entropy=entropy)
        return s.encode('utf8')

    @command('')
    def check_seed(self, seed, entropy=1, language=None):
        """Check that a seed was generated with given entropy"""
        from mnemonic import Mnemonic
        return Mnemonic(language).check_seed(seed, entropy)

    @command('n')
    def getaddresshistory(self, address):
        """Return the transaction history of any address. Note: This is a
        walletless server query, results are not checked by SPV.
        """
        return self.network.synchronous_get(('blockchain.address.get_history', [address]))

    @command('nw')
    def listunspent(self):
        """List unspent outputs. Returns the list of unspent transaction
        outputs in your wallet."""
        l = copy.deepcopy(self.wallet.get_spendable_coins(exclude_frozen = False))
        for i in l:
            v = i["value"]
            i["value"] = float(v)/COIN if v is not None else None
        return l

    @command('n')
    def getaddressunspent(self, address):
        """Returns the UTXO list of any address. Note: This
        is a walletless server query, results are not checked by SPV.
        """
        return self.network.synchronous_get(('blockchain.address.listunspent', [address]))

    @command('n')
    def getutxoaddress(self, txid, pos):
        """Get the address of a UTXO. Note: This is a walletless server query, results are
        not checked by SPV.
        """
        r = self.network.synchronous_get(('blockchain.utxo.get_address', [txid, pos]))
        return {'address': r}

    @command('wp')
    def createrawtx(self, inputs, outputs, unsigned=False):
        """Create a transaction from json inputs. The syntax is similar to bitcoind."""
        coins = self.wallet.get_spendable_coins(exclude_frozen = False)
        tx_inputs = []
        for i in inputs:
            prevout_hash = i['txid']
            prevout_n = i['vout']
            for c in coins:
                if c['prevout_hash'] == prevout_hash and c['prevout_n'] == prevout_n:
                    self.wallet.add_input_info(c)
                    tx_inputs.append(c)
                    break
            else:
                raise BaseException('Transaction output not in wallet', prevout_hash+":%d"%prevout_n)
        outputs = map(lambda x: ('address', x[0], int(COIN*x[1])), outputs.items())
        tx = Transaction.from_io(tx_inputs, outputs)
        if not unsigned:
            self.wallet.sign_transaction(tx, self.password)
        return tx.as_dict()

    @command('wp')
    def signtransaction(self, tx, privkey=None):
        """Sign a transaction. The wallet keys will be used unless a private key is provided."""
        t = Transaction(tx)
        t.deserialize()
        if privkey:
            pubkey = bitcoin.public_key_from_private_key(privkey)
            t.sign({pubkey:privkey})
        else:
            self.wallet.sign_transaction(t, self.password)
        return t.as_dict()

    @command('')
    def deserialize(self, tx):
        """Deserialize a serialized transaction"""
        t = Transaction(tx)
        return t.deserialize()

    @command('n')
    def broadcast(self, tx):
        """Broadcast a transaction to the network. """
        t = Transaction(tx)
        return self.network.synchronous_get(('blockchain.transaction.broadcast', [str(t)]))

    @command('')
    def createmultisig(self, num, pubkeys):
        """Create multisig address"""
        assert isinstance(pubkeys, list), (type(num), type(pubkeys))
        redeem_script = Transaction.multisig_script(pubkeys, num)
        address = hash_160_to_bc_address(hash_160(redeem_script.decode('hex')), 5)
        return {'address':address, 'redeemScript':redeem_script}

    @command('w')
    def freeze(self, address):
        """Freeze address. Freeze the funds at one of your wallet\'s addresses"""
        return self.wallet.set_frozen_state([address], True)

    @command('w')
    def unfreeze(self, address):
        """Unfreeze address. Unfreeze the funds at one of your wallet\'s address"""
        return self.wallet.set_frozen_state([address], False)

    @command('wp')
    def getprivatekeys(self, address):
        """Get private keys of addresses. You may pass a single wallet address, or a list of wallet addresses."""
        is_list = type(address) is list
        domain = address if is_list else [address]
        out = [self.wallet.get_private_key(address, self.password) for address in domain]
        return out if is_list else out[0]

    @command('w')
    def ismine(self, address):
        """Check if address is in wallet. Return true if and only address is in wallet"""
        return self.wallet.is_mine(address)

    @command('')
    def dumpprivkeys(self):
        """Deprecated."""
        return "This command is deprecated. Use a pipe instead: 'electrum listaddresses | electrum getprivatekeys - '"

    @command('')
    def validateaddress(self, address):
        """Check that an address is valid. """
        return is_address(address)

    @command('w')
    def getpubkeys(self, address):
        """Return the public keys for a wallet address. """
        return self.wallet.get_public_keys(address)

    @command('nw')
    def getbalance(self, account=None):
        """Return the balance of your wallet. If run with the --offline flag,
        returns the last known balance."""
        if account is None:
            c, u, x = self.wallet.get_balance()
        else:
            c, u, x = self.wallet.get_account_balance(account)
        out = {"confirmed": str(Decimal(c)/COIN)}
        if u:
            out["unconfirmed"] = str(Decimal(u)/COIN)
        if x:
            out["unmatured"] = str(Decimal(x)/COIN)
        return out

    @command('n')
    def getaddressbalance(self, address):
        """Return the balance of any address. Note: This is a walletless
        server query, results are not checked by SPV.
        """
        out = self.network.synchronous_get(('blockchain.address.get_balance', [address]))
        out["confirmed"] =  str(Decimal(out["confirmed"])/COIN)
        out["unconfirmed"] =  str(Decimal(out["unconfirmed"])/COIN)
        return out

    @command('n')
    def getproof(self, address):
        """Get Merkle branch of an address in the UTXO set"""
        p = self.network.synchronous_get(('blockchain.address.get_proof', [address]))
        out = []
        for i,s in p:
            out.append(i)
        return out

    @command('n')
    def getmerkle(self, txid, height):
        """Get Merkle branch of a transaction included in a block. Electrum
        uses this to verify transactions (Simple Payment Verification)."""
        return self.network.synchronous_get(('blockchain.transaction.get_merkle', [txid, int(height)]))

    @command('n')
    def getservers(self):
        """Return the list of available servers"""
        while not self.network.is_up_to_date():
            time.sleep(0.1)
        return self.network.get_servers()

    @command('')
    def version(self):
        """Return the version of electrum."""
        import electrum  # Needs to stay here to prevent ciruclar imports
        return electrum.ELECTRUM_VERSION

    @command('w')
    def getmpk(self):
        """Get master public key. Return your wallet\'s master public key(s)"""
        return self.wallet.get_master_public_keys()

    @command('wp')
    def getmasterprivate(self):
        """Get master private key. Return your wallet\'s master private key"""
        return str(self.wallet.get_master_private_key(self.wallet.root_name, self.password))

    @command('wp')
    def getseed(self):
        """Get seed phrase. Print the generation seed of your wallet."""
        s = self.wallet.get_mnemonic(self.password)
        return s.encode('utf8')

    @command('wp')
    def importprivkey(self, privkey):
        """Import a private key. """
        try:
            addr = self.wallet.import_key(privkey, self.password)
            out = "Keypair imported: " + addr
        except Exception as e:
            out = "Error: " + str(e)
        return out

    def _resolver(self, x):
        if x is None:
            return None
        out = self.contacts.resolve(x)
        if out.get('type') == 'openalias' and self.nocheck is False and out.get('validated') is False:
            raise BaseException('cannot verify alias', x)
        return out['address']

    @command('n')
    def sweep(self, privkey, destination, tx_fee=None, nocheck=False):
        """Sweep private keys. Returns a transaction that spends UTXOs from
        privkey to a destination address. The transaction is not
        broadcasted."""
        privkeys = privkey if type(privkey) is list else [privkey]
        self.nocheck = nocheck
        dest = self._resolver(destination)
        if tx_fee is None:
            tx_fee = 0.0001
        fee = int(Decimal(tx_fee)*COIN)
        return Transaction.sweep(privkeys, self.network, dest, fee)

    @command('wp')
    def signmessage(self, address, message):
        """Sign a message with a key. Use quotes if your message contains
        whitespaces"""
        sig = self.wallet.sign_message(address, message, self.password)
        return base64.b64encode(sig)

    @command('')
    def verifymessage(self, address, signature, message):
        """Verify a signature."""
        sig = base64.b64decode(signature)
        return bitcoin.verify_message(address, sig, message)

    def _mktx(self, outputs, fee, change_addr, domain, nocheck, unsigned):
        self.nocheck = nocheck
        change_addr = self._resolver(change_addr)
        domain = None if domain is None else map(self._resolver, domain)
        fee = None if fee is None else int(COIN*Decimal(fee))
        final_outputs = []
        for address, amount in outputs:
            address = self._resolver(address)
            #assert self.wallet.is_mine(address)
            if amount == '!':
                assert len(outputs) == 1
                inputs = self.wallet.get_spendable_coins(domain)
                amount = sum(map(lambda x:x['value'], inputs))
                if fee is None:
                    for i in inputs:
                        self.wallet.add_input_info(i)
                    output = ('address', address, amount)
                    dummy_tx = Transaction.from_io(inputs, [output])
                    fee_per_kb = self.wallet.fee_per_kb(self.config)
                    fee = dummy_tx.estimated_fee(fee_per_kb)
                amount -= fee
            else:
                amount = int(COIN*Decimal(amount))
            final_outputs.append(('address', address, amount))

        coins = self.wallet.get_spendable_coins(domain)
        tx = self.wallet.make_unsigned_transaction(coins, final_outputs, self.config, fee, change_addr)
        str(tx) #this serializes
        if not unsigned:
            self.wallet.sign_transaction(tx, self.password)
        return tx

    @command('wpn')
    def payto(self, destination, amount, tx_fee=None, from_addr=None, change_addr=None, nocheck=False, unsigned=False):
        """Create a transaction. """
        domain = [from_addr] if from_addr else None
        tx = self._mktx([(destination, amount)], tx_fee, change_addr, domain, nocheck, unsigned)
        return tx.as_dict()

    @command('wpn')
    def paytomany(self, outputs, tx_fee=None, from_addr=None, change_addr=None, nocheck=False, unsigned=False):
        """Create a multi-output transaction. """
        domain = [from_addr] if from_addr else None
        tx = self._mktx(outputs, tx_fee, change_addr, domain, nocheck, unsigned)
        return tx.as_dict()

    @command('wn')
    def history(self):
        """Wallet history. Returns the transaction history of your wallet."""
        balance = 0
        out = []
        for item in self.wallet.get_history():
            tx_hash, conf, value, timestamp, balance = item
            try:
                time_str = datetime.datetime.fromtimestamp(timestamp).isoformat(' ')[:-3]
            except Exception:
                time_str = "----"
            label, is_default_label = self.wallet.get_label(tx_hash)
            out.append({
                'txid':tx_hash,
                'timestamp':timestamp,
                'date':"%16s"%time_str,
                'label':label,
                'value':float(value)/COIN if value is not None else None,
                'confirmations':conf}
            )
        return out

    @command('w')
    def setlabel(self, key, label):
        """Assign a label to an item. Item may be a bitcoin address or a
        transaction ID"""
        self.wallet.set_label(key, label)

    @command('')
    def listcontacts(self):
        """Show your list of contacts"""
        return self.contacts

    @command('')
    def getalias(self, key):
        """Retrieve alias. Lookup in your list of contacts, and for an OpenAlias DNS record."""
        return self.contacts.resolve(key)

    @command('')
    def searchcontacts(self, query):
        """Search through contacts, return matching entries. """
        results = {}
        for key, value in self.contacts.items():
            if query.lower() in key.lower():
                results[key] = value
        return results

    @command('w')
    def listaddresses(self, receiving=False, change=False, show_labels=False, frozen=False, unused=False, funded=False, show_balance=False):
        """List wallet addresses. Returns the list of all addresses in your wallet. Use optional arguments to filter the results."""
        out = []
        for addr in self.wallet.addresses(True):
            if frozen and not self.wallet.is_frozen(addr):
                continue
            if receiving and self.wallet.is_change(addr):
                continue
            if change and not self.wallet.is_change(addr):
                continue
            if unused and self.wallet.is_used(addr):
                continue
            if funded and self.wallet.is_empty(addr):
                continue
            item = addr
            if show_balance:
                item += ", "+ format_satoshis(sum(self.wallet.get_addr_balance(addr)))
            if show_labels:
                item += ', ' + repr(self.wallet.labels.get(addr, ''))
            out.append(item)
        return out

    @command('nw')
    def gettransaction(self, txid):
        """Retrieve a transaction. """
        tx = self.wallet.transactions.get(txid) if self.wallet else None
        if tx is None and self.network:
            raw = self.network.synchronous_get(('blockchain.transaction.get', [txid]))
            if raw:
                tx = Transaction(raw)
            else:
                raise BaseException("Unknown transaction")
        return tx.as_dict()

    @command('')
    def encrypt(self, pubkey, message):
        """Encrypt a message with a public key. Use quotes if the message contains whitespaces."""
        return bitcoin.encrypt_message(message, pubkey)

    @command('wp')
    def decrypt(self, pubkey, encrypted):
        """Decrypt a message encrypted with a public key."""
        return self.wallet.decrypt_message(pubkey, encrypted, self.password)

    def _format_request(self, out):
        pr_str = {
            PR_UNKNOWN: 'Unknown',
            PR_UNPAID: 'Pending',
            PR_PAID: 'Paid',
            PR_EXPIRED: 'Expired',
        }
        out['amount (BTC)'] = format_satoshis(out.get('amount'))
        out['status'] = pr_str[out.get('status', PR_UNKNOWN)]
        return out

    @command('wn')
    def getrequest(self, key):
        """Return a payment request"""
        r = self.wallet.get_payment_request(key, self.config)
        if not r:
            raise BaseException("Request not found")
        return self._format_request(r)

    #@command('w')
    #def ackrequest(self, serialized):
    #    """<Not implemented>"""
    #    pass

    @command('wn')
    def listrequests(self, pending=False, expired=False, paid=False):
        """List the payment requests you made."""
        out = self.wallet.get_sorted_requests(self.config)
        if pending:
            f = PR_UNPAID
        elif expired:
            f = PR_EXPIRED
        elif paid:
            f = PR_PAID
        else:
            f = None
        if f is not None:
            out = filter(lambda x: x.get('status')==f, out)
        return map(self._format_request, out)

    @command('w')
    def addrequest(self, requested_amount, memo='', expiration=60*60, force=False):
        """Create a payment request."""
        addr = self.wallet.get_unused_address(None)
        if addr is None:
            if force:
                addr = self.wallet.create_new_address(None, False)
            else:
                return False
        amount = int(Decimal(requested_amount)*COIN)
        expiration = int(expiration)
        req = self.wallet.make_payment_request(addr, amount, memo, expiration)
        self.wallet.add_payment_request(req, self.config)
        out = self.wallet.get_payment_request(addr, self.config)
        return self._format_request(out)

    @command('wp')
    def signrequest(self, address):
        "Sign payment request with an OpenAlias"
        alias = self.config.get('alias')
        if not alias:
            raise BaseException('No alias in your configuration')
        alias_addr = self.contacts.resolve(alias)['address']
        self.wallet.sign_payment_request(address, alias, alias_addr, self.password)

    @command('w')
    def rmrequest(self, address):
        """Remove a payment request"""
        return self.wallet.remove_payment_request(address, self.config)

    @command('w')
    def clearrequests(self):
        """Remove all payment requests"""
        for k in self.wallet.receive_requests.keys():
            self.wallet.remove_payment_request(k, self.config)

    @command('n')
    def notify(self, address, URL):
        """Watch an address. Everytime the address changes, a http POST is sent to the URL."""
        def callback(x):
            import urllib2
            headers = {'content-type':'application/json'}
            data = {'address':address, 'status':x.get('result')}
            try:
                req = urllib2.Request(URL, json.dumps(data), headers)
                response_stream = urllib2.urlopen(req)
                util.print_error('Got Response for %s' % address)
            except BaseException as e:
                util.print_error(str(e))
        self.network.send([('blockchain.address.subscribe', [address])], callback)
        return True

param_descriptions = {
    'privkey': 'Private key. Type \'?\' to get a prompt.',
    'destination': 'Bitcoin address, contact or alias',
    'address': 'Bitcoin address',
    'seed': 'Seed phrase',
    'txid': 'Transaction ID',
    'pos': 'Position',
    'height': 'Block height',
    'tx': 'Serialized transaction (hexadecimal)',
    'key': 'Variable name',
    'pubkey': 'Public key',
    'message': 'Clear text message. Use quotes if it contains spaces.',
    'encrypted': 'Encrypted message',
    'amount': 'Amount to be sent (in BTC). Type \'!\' to send the maximum available.',
    'requested_amount': 'Requested amount (in BTC).',
    'outputs': 'list of ["address", amount]',
}

command_options = {
    'password':    ("-W", "--password",    "Password"),
    'receiving':   (None, "--receiving",   "Show only receiving addresses"),
    'change':      (None, "--change",      "Show only change addresses"),
    'frozen':      (None, "--frozen",      "Show only frozen addresses"),
    'unused':      (None, "--unused",      "Show only unused addresses"),
    'funded':      (None, "--funded",      "Show only funded addresses"),
    'show_balance':("-b", "--balance",     "Show the balances of listed addresses"),
    'show_labels': ("-l", "--labels",      "Show the labels of listed addresses"),
    'nocheck':     (None, "--nocheck",     "Do not verify aliases"),
    'tx_fee':      ("-f", "--fee",         "Transaction fee (in BTC)"),
    'from_addr':   ("-F", "--from",        "Source address. If it isn't in the wallet, it will ask for the private key unless supplied in the format public_key:private_key. It's not saved in the wallet."),
    'change_addr': ("-c", "--change",      "Change address. Default is a spare address, or the source address if it's not in the wallet"),
    'nbits':       (None, "--nbits",       "Number of bits of entropy"),
    'entropy':     (None, "--entropy",     "Custom entropy"),
    'language':    ("-L", "--lang",        "Default language for wordlist"),
    'gap_limit':   ("-G", "--gap",         "Gap limit"),
    'privkey':     (None, "--privkey",     "Private key. Set to '?' to get a prompt."),
    'unsigned':    ("-u", "--unsigned",    "Do not sign transaction"),
    'domain':      ("-D", "--domain",      "List of addresses"),
    'account':     (None, "--account",     "Account"),
    'memo':        ("-m", "--memo",        "Description of the request"),
    'expiration':  (None, "--expiration",  "Time in seconds"),
    'force':       (None, "--force",       "Create new address beyong gap limit, if no more address is available."),
    'pending':     (None, "--pending",     "Show only pending requests."),
    'expired':     (None, "--expired",     "Show only expired requests."),
    'paid':        (None, "--paid",        "Show only paid requests."),
}


arg_types = {
    'num':int,
    'nbits':int,
    'entropy':long,
    'pubkeys': json.loads,
    'inputs': json.loads,
    'outputs': json.loads,
    'tx_fee': lambda x: float(x) if x is not None else None,
    'amount': lambda x: float(x) if x!='!' else '!',
}

config_variables = {

    'addrequest': {
        'requests_dir': 'directory where a bip70 file will be written.',
        'ssl_privkey': 'Path to your SSL private key, needed to sign the request.',
        'ssl_chain': 'Chain of SSL certificates, needed for signed requests. Put your certificate at the top and the root CA at the end',
        'url_rewrite': 'Parameters passed to str.replace(), in order to create the r= part of bitcoin: URIs. Example: \"(\'file:///var/www/\',\'https://electrum.org/\')\"',
    },
    'listrequests':{
        'url_rewrite': 'Parameters passed to str.replace(), in order to create the r= part of bitcoin: URIs. Example: \"(\'file:///var/www/\',\'https://electrum.org/\')\"',
    }
}

def set_default_subparser(self, name, args=None):
    """see http://stackoverflow.com/questions/5176691/argparse-how-to-specify-a-default-subcommand"""
    subparser_found = False
    for arg in sys.argv[1:]:
        if arg in ['-h', '--help']:  # global help if no subparser
            break
    else:
        for x in self._subparsers._actions:
            if not isinstance(x, argparse._SubParsersAction):
                continue
            for sp_name in x._name_parser_map.keys():
                if sp_name in sys.argv[1:]:
                    subparser_found = True
        if not subparser_found:
            # insert default in first position, this implies no
            # global options without a sub_parsers specified
            if args is None:
                sys.argv.insert(1, name)
            else:
                args.insert(0, name)

argparse.ArgumentParser.set_default_subparser = set_default_subparser



def add_network_options(parser):
    parser.add_argument("-1", "--oneserver", action="store_true", dest="oneserver", default=False, help="connect to one server only")
    parser.add_argument("-s", "--server", dest="server", default=None, help="set server host:port:protocol, where protocol is either t (tcp) or s (ssl)")
    parser.add_argument("-p", "--proxy", dest="proxy", default=None, help="set proxy [type:]host[:port], where type is socks4,socks5 or http")

from util import profiler

@profiler
def get_parser():
    # parent parser, because set_default_subparser removes global options
    parent_parser = argparse.ArgumentParser('parent', add_help=False)
    group = parent_parser.add_argument_group('global options')
    group.add_argument("-v", "--verbose", action="store_true", dest="verbose", default=False, help="Show debugging information")
    group.add_argument("-P", "--portable", action="store_true", dest="portable", default=False, help="Use local 'electrum_data' directory")
    group.add_argument("-w", "--wallet", dest="wallet_path", help="wallet path")
    group.add_argument("-o", "--offline", action="store_true", dest="offline", default=False, help="Run offline")
    # create main parser
    parser = argparse.ArgumentParser(
        parents=[parent_parser],
        epilog="Run 'electrum help <command>' to see the help for a command")
    subparsers = parser.add_subparsers(dest='cmd', metavar='<command>')
    # gui
    parser_gui = subparsers.add_parser('gui', parents=[parent_parser], description="Run Electrum's Graphical User Interface.", help="Run GUI (default)")
    parser_gui.add_argument("url", nargs='?', default=None, help="bitcoin URI (or bip70 file)")
    #parser_gui.set_defaults(func=run_gui)
    parser_gui.add_argument("-g", "--gui", dest="gui", help="select graphical user interface", choices=['qt', 'lite', 'gtk', 'kivy', 'text', 'stdio', 'jsonrpc'])
    parser_gui.add_argument("-m", action="store_true", dest="hide_gui", default=False, help="hide GUI on startup")
    parser_gui.add_argument("-L", "--lang", dest="language", default=None, help="default language used in GUI")
    add_network_options(parser_gui)
    # daemon
    parser_daemon = subparsers.add_parser('daemon', parents=[parent_parser], help="Run Daemon")
    parser_daemon.add_argument("subcommand", choices=['start', 'status', 'stop'])
    #parser_daemon.set_defaults(func=run_daemon)
    add_network_options(parser_daemon)
    # commands
    for cmdname in sorted(known_commands.keys()):
        cmd = known_commands[cmdname]
        p = subparsers.add_parser(cmdname, parents=[parent_parser], help=cmd.help, description=cmd.description)
        #p.set_defaults(func=run_cmdline)
        if cmd.requires_password:
            p.add_argument("-W", "--password", dest="password", default=None, help="password")
        for optname, default in zip(cmd.options, cmd.defaults):
            a, b, help = command_options[optname]
            action = "store_true" if type(default) is bool else 'store'
            args = (a, b) if a else (b,)
            if action == 'store':
                _type = arg_types.get(optname, str)
                p.add_argument(*args, dest=optname, action=action, default=default, help=help, type=_type)
            else:
                p.add_argument(*args, dest=optname, action=action, default=default, help=help)

        for param in cmd.params:
            h = param_descriptions.get(param, '')
            _type = arg_types.get(param, str)
            p.add_argument(param, help=h, type=_type)

        cvh = config_variables.get(cmdname)
        if cvh:
            group = p.add_argument_group('configuration variables', '(set with setconfig/getconfig)')
            for k, v in cvh.items():
                group.add_argument(k, nargs='?', help=v)

    # 'gui' is the default command
    parser.set_default_subparser('gui')
    return parser
