#!/usr/bin/env python2
# -*- mode: 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/>.

from decimal import Decimal
import json
import os
import re
import sys
import time
import traceback

script_dir = os.path.dirname(os.path.realpath(__file__))
is_bundle = getattr(sys, 'frozen', False)
is_local = not is_bundle and os.path.exists(os.path.join(script_dir, "setup-release.py"))
is_android = 'ANDROID_DATA' in os.environ

if is_local or is_android:
    sys.path.insert(0, os.path.join(script_dir, 'packages'))
elif is_bundle and sys.platform=='darwin':
    sys.path.insert(0, os.getcwd() + "/lib/python2.7/packages")

# pure-python dependencies need to be imported here for pyinstaller
try:
    import dns
    import aes
    import ecdsa
    import requests
    import six
    import qrcode
    import pbkdf2
    import google.protobuf
except ImportError as e:
    sys.exit("Error: %s. Try 'sudo pip install <module-name>'"%e.message)

# the following imports are for pyinstaller
from google.protobuf import descriptor
from google.protobuf import message
from google.protobuf import reflection
from google.protobuf import descriptor_pb2


# check that we have the correct version of ecdsa
try:
    from ecdsa.ecdsa import curve_secp256k1, generator_secp256k1
except Exception:
    sys.exit("cannot import ecdsa.curve_secp256k1. You probably need to upgrade ecdsa.\nTry: sudo pip install --upgrade ecdsa")


# load local module as electrum
if is_bundle or is_local or is_android:
    import imp
    imp.load_module('electrum', *imp.find_module('lib'))
    imp.load_module('electrum_gui', *imp.find_module('gui'))


from electrum import util
from electrum import SimpleConfig, Network, Wallet, WalletStorage, NetworkProxy
from electrum.util import print_msg, print_error, print_stderr, print_json, set_verbosity, InvalidPassword
from electrum.daemon import get_daemon
from electrum.plugins import init_plugins, run_hook, always_hook
from electrum.commands import get_parser, known_commands, Commands, config_variables


# get password routine
def prompt_password(prompt, confirm=True):
    import getpass
    if sys.stdin.isatty():
        password = getpass.getpass(prompt)
        if password and confirm:
            password2 = getpass.getpass("Confirm: ")
            if password != password2:
                sys.exit("Error: Passwords do not match.")
    else:
        password = raw_input(prompt)
    if not password:
        password = None
    return password



def run_gui(config):
    url = config.get('url')
    if url:
        if os.path.exists(url):
            # assume this is a payment request
            url = "bitcoin:?r=file://"+ os.path.join(os.getcwd(), url)

        if not re.match('^bitcoin:', url):
            print_stderr('unknown command:', url)
            sys.exit(1)

    gui_name = config.get('gui', 'qt')
    if gui_name in ['lite', 'classic']:
        gui_name = 'qt'

    try:
        gui = __import__('electrum_gui.' + gui_name, fromlist=['electrum_gui'])
    except ImportError:
        traceback.print_exc(file=sys.stdout)
        sys.exit()

    # network interface
    if not config.get('offline'):
        s = get_daemon(config, False)
        if s:
            print_msg("Connected to daemon")
        network = NetworkProxy(s, config)
        network.start()
    else:
        network = None

    gui = gui.ElectrumGui(config, network)
    gui.main(url)

    if network:
        network.stop()

    # sleep to let socket threads timeout
    time.sleep(0.3)
    sys.exit(0)


def run_daemon(config):
    cmd = config.get('subcommand')
    if cmd not in ['start', 'stop', 'status']:
        print_msg("syntax: electrum daemon <start|status|stop>")
        sys.exit(1)
    s = get_daemon(config, False)
    if cmd == 'start':
        if s:
            print_msg("Daemon already running")
            sys.exit(1)
        get_daemon(config, True)
        sys.exit(0)
    elif cmd in ['status','stop']:
        if not s:
            print_msg("Daemon not running")
            sys.exit(1)
        network = NetworkProxy(s, config)
        network.start()
        if cmd == 'status':
            p = network.get_parameters()
            print_json({
                'path': network.config.path,
                'server': p[0],
                'blockchain_height': network.get_local_height(),
                'server_height': network.get_server_height(),
                'nodes': network.get_interfaces(),
                'connected': network.is_connected(),
                'auto_connect': p[4],
            })
        elif cmd == 'stop':
            network.stop_daemon()
            print_msg("Daemon stopped")
        network.stop()
    else:
        print "unknown command \"%s\""% arg
    sys.exit(0)





def run_cmdline(config):

    cmdname = config.get('cmd')
    cmd = known_commands[cmdname]

    if cmdname == 'signtransaction' and config.get('privkey'):
        cmd.requires_wallet = False
        cmd.requires_password = False

    if cmdname in ['payto', 'paytomany'] and config.get('unsigned'):
        cmd.requires_password = False

    if cmdname in ['payto', 'paytomany'] and config.get('broadcast'):
        cmd.requires_network = True

    if cmdname in ['createrawtx'] and config.get('unsigned'):
        cmd.requires_password = False
        cmd.requires_wallet = False

    if cmdname == 'listrequests' and config.get('status'):
        cmd.requires_network = True

    # arguments passed to function
    args = map(lambda x: config.get(x), cmd.params)
    # options
    args += map(lambda x: config.get(x), cmd.options)

    # instanciate wallet for command-line
    storage = WalletStorage(config.get_wallet_path())

    if cmd.name in ['create', 'restore']:
        if storage.file_exists:
            sys.exit("Error: Remove the existing wallet first!")
        if config.get('password') is not None:
            password = config.get('password')
        elif cmd.name == 'restore' and config.get('mpk'):
            password = None
        else:
            password = prompt_password("Password (hit return if you do not wish to encrypt your wallet):")

        if cmd.name == 'restore':
            mpk = config.get('mpk')
            if mpk:
                if Wallet.is_old_mpk(mpk):
                    wallet = Wallet.from_old_mpk(mpk, storage)
                if Wallet.is_xpub(mpk):
                    wallet = Wallet.from_xpub(mpk, storage)
            else:
                import getpass
                seed = getpass.getpass(prompt="seed:", stream=None) if config.get('concealed') else raw_input("seed:")
                if not Wallet.is_seed(seed):
                    sys.exit("Error: Invalid seed")
                wallet = Wallet.from_seed(seed, password, storage)

            if not config.get('offline'):
                s = get_daemon(config, False)
                network = NetworkProxy(s, config)
                network.start()
                wallet.start_threads(network)
                print_msg("Recovering wallet...")
                wallet.restore(lambda x: x)
                if wallet.is_found():
                    print_msg("Recovery successful")
                else:
                    print_msg("Warning: Found no history for this wallet")
            else:
                wallet.synchronize()
                print_msg("Warning: This wallet was restored offline. It may contain more addresses than displayed.")

        else:
            wallet = Wallet(storage)
            seed = wallet.make_seed()
            wallet.add_seed(seed, password)
            wallet.create_master_keys(password)
            wallet.create_main_account(password)
            wallet.synchronize()
            print_msg("Your wallet generation seed is:\n\"%s\"" % seed)
            print_msg("Please keep it in a safe place; if you lose it, you will not be able to restore your wallet.")

        print_msg("Wallet saved in '%s'" % wallet.storage.path)
        # terminate
        sys.exit(0)

    if cmd.name not in ['create', 'restore'] and cmd.requires_wallet and not storage.file_exists:
        print_msg("Error: Wallet file not found.")
        print_msg("Type 'electrum create' to create a new wallet, or provide a path to a wallet with the -w option")
        sys.exit(0)

    # create wallet instance
    wallet = Wallet(storage) if cmd.requires_wallet else None

    # notify plugins
    always_hook('cmdline_load_wallet', wallet)

    # important warning
    if cmd.name in ['dumpprivkey', 'dumpprivkeys']:
        print_stderr("WARNING: ALL your private keys are secret.")
        print_stderr("Exposing a single private key can compromise your entire wallet!")
        print_stderr("In particular, DO NOT use 'redeem private key' services proposed by third parties.")

    # commands needing password
    if cmd.requires_password:
        if wallet.use_encryption:
            password = prompt_password('Password:', False)
            if not password:
                print_msg("Error: Password required")
                sys.exit(1)
            # check password
            try:
                seed = wallet.check_password(password)
            except InvalidPassword:
                print_msg("Error: This password does not decode this wallet.")
                sys.exit(1)
        else:
            password = None
    else:
        password = None

    # start network threads
    if cmd.requires_network and not config.get('offline'):
        s = get_daemon(config, False)
        if not s:
            print_msg("Network daemon is not running. Try 'electrum daemon start'\nIf you want to run this command offline, use the -o flag.")
            sys.exit(1)
        network = NetworkProxy(s, config)
        network.start()
        while network.status == 'unknown':
            time.sleep(0.1)
        if not network.is_connected():
            print_msg("daemon is not connected")
            sys.exit(1)
        if wallet:
            wallet.start_threads(network)
            wallet.update()
    else:
        network = None

    # run the command
    if cmd.name == 'deseed':
        if not wallet.seed:
            print_msg("Error: This wallet has no seed")
        else:
            ns = wallet.storage.path + '.seedless'
            print_msg("Warning: you are going to create a seedless wallet'\nIt will be saved in '%s'" % ns)
            if raw_input("Are you sure you want to continue? (y/n) ") in ['y', 'Y', 'yes']:
                wallet.storage.path = ns
                wallet.seed = ''
                wallet.storage.put('seed', '', True)
                wallet.use_encryption = False
                wallet.storage.put('use_encryption', wallet.use_encryption, True)
                for k in wallet.imported_keys.keys():
                    wallet.imported_keys[k] = ''
                wallet.storage.put('imported_keys', wallet.imported_keys, True)
                print_msg("Done.")
            else:
                print_msg("Action canceled.")

    elif cmd.name == 'password':
        new_password = prompt_password('New password:')
        wallet.update_password(password, new_password)

    else:
        cmd_runner = Commands(config, wallet, network)
        func = getattr(cmd_runner, cmd.name)
        cmd_runner.password = password
        try:
            result = func(*args)
        except Exception:
            traceback.print_exc(file=sys.stderr)
            sys.exit(1)

        if type(result) == str:
            print_msg(result)
        elif result is not None:
            print_json(result)

    # shutdown wallet and network
    if cmd.requires_network and not config.get('offline'):
        if wallet:
            wallet.stop_threads()
        network.stop()




if __name__ == '__main__':

    # on osx, delete Process Serial Number arg generated for apps launched in Finder
    sys.argv = filter(lambda x: not x.startswith('-psn'), sys.argv)

    # old 'help' syntax
    if len(sys.argv)>1 and sys.argv[1] == 'help':
        sys.argv.remove('help')
        sys.argv.append('-h')

    parser = get_parser(run_gui, run_daemon, run_cmdline)
    args = parser.parse_args()

    # config is an object passed to the various constructors (wallet, interface, gui)
    if is_android:
        config_options = {
            'verbose': True,
            'gui': 'android',
            'auto_connect': True,
        }
    else:
        config_options = args.__dict__
        for k, v in config_options.items():
            if v is None or (k in config_variables.get(args.cmd, {}).keys()):
                config_options.pop(k)
        if config_options.get('server'):
            config_options['auto_connect'] = False

    if config_options.get('portable'):
        config_options['electrum_path'] = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'electrum_data')

    # If private key is passed on the command line, '?' triggers prompt.
    if config_options.get('privkey') and config_options['privkey'] == '?':
        config_options['privkey'] = prompt_password('Enter PrivateKey (will not echo):', False)

    set_verbosity(config_options.get('verbose'))
    config = SimpleConfig(config_options)

    assert os.path.exists(requests.utils.DEFAULT_CA_BUNDLE_PATH)

    gui_name = config.get('gui', 'qt') if args.cmd == 'gui' else 'cmdline'

    # initialize plugins.
    if not is_android:
        init_plugins(config, is_bundle or is_local or is_android, gui_name)

    # call function attached to parser
    args.func(config)
    sys.exit(0)
