#!/usr/bin/env python

# This file is part of the TREZOR project.
#
# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
# Copyright (C) 2016      Jochen Hoenicke <hoenicke@gmail.com>
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This library 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

import binascii
import json
import base64
import click

from trezorlib.client import TrezorClient, TrezorClientVerbose, CallException
import trezorlib.types_pb2 as types


def get_transport_class_by_name(name):

    if name == 'usb':
        from trezorlib.transport_hid import HidTransport
        return HidTransport

    if name == 'udp':
        from trezorlib.transport_udp import UdpTransport
        return UdpTransport

    if name == 'pipe':
        from trezorlib.transport_pipe import PipeTransport
        return PipeTransport

    if name == 'bridge':
        from trezorlib.transport_bridge import BridgeTransport
        return BridgeTransport

    raise NotImplementedError('Unknown transport: "%s"' % name)


def get_transport(transport_name, path):
    transport = get_transport_class_by_name(transport_name)
    dev = transport.find_by_path(path)
    return dev


def output(res):
    if output.json:
        click.echo(json.dumps(res, sort_keys=True, indent=4))
    else:
        click.echo(res)


@click.group()
@click.option('-t', '--transport', type=click.Choice(['usb', 'udp', 'pipe', 'bridge']), default='usb', help='Select transport used for communication.')
@click.option('-p', '--path', help='Select device by transport-specific path.')
@click.option('-v', '--verbose', is_flag=True, help='Show communication messages.')
@click.option('-j', '--json', 'is_json', is_flag=True, help='Print result as JSON object')
@click.pass_context
def cli(ctx, transport, path, verbose, is_json):
    output.json = is_json
    if ctx.invoked_subcommand == 'list':
        ctx.obj = transport
    else:
        t = get_transport(transport, path)
        if verbose:
            ctx.obj = TrezorClientVerbose(t)
        else:
            ctx.obj = TrezorClient(t)


#
# Common functions
#


@cli.command(name='list', help='List connected TREZOR devices.')
@click.pass_obj
def ls(transport_name):
    transport_class = get_transport_class_by_name(transport_name)
    devices = transport_class.enumerate()
    if output.json:
        click.echo(json.dumps(devices, sort_keys=True, indent=4))
    else:
        if transport_name == 'usb':
            for dev in devices:
                if dev[1] is not None:
                    click.echo('%s - debuglink enabled' % dev[0])
                else:
                    click.echo(dev[0])
        else:
            for dev in devices:
                click.echo(dev)


#
# Basic device functions
#


@cli.command(help='Send ping message.')
@click.argument('message')
@click.option('-b', '--button-protection', is_flag=True)
@click.option('-p', '--pin-protection', is_flag=True)
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.pass_obj
def ping(client, message, button_protection, pin_protection, passphrase_protection):
    ret = client.ping(message, button_protection=button_protection, pin_protection=pin_protection, passphrase_protection=passphrase_protection)
    output(ret)


@cli.command(help='Clear session (remove cached PIN, passphrase, etc.).')
@click.pass_obj
def clear_session(client):
    ret = client.clear_session()
    output(ret)


@cli.command(help='Get example entropy.')
@click.argument('size', type=int)
@click.pass_obj
def get_entropy(client, size):
    ret = binascii.hexlify(client.get_entropy(size))
    output(ret)


@cli.command(help='Retrieve device features and settings.')
@click.pass_obj
def get_features(client):
    return client.features


@cli.command(help='List all supported coin types by the device.')
@click.pass_obj
def list_coins(client):
    ret = [coin.coin_name for coin in client.features.coins]
    output(ret)


#
# Device management functions
#


@cli.command(help='Change new PIN or remove existing.')
@click.option('-r', '--remove', is_flag=True)
@click.pass_obj
def change_pin(client, remove):
    ret = client.change_pin(remove)
    output(ret)


@cli.command(help='Enable passphrase.')
@click.pass_obj
def enable_passphrase(client):
    ret = client.apply_settings(use_passphrase=True)
    output(ret)


@cli.command(help='Disable passphrase.')
@click.pass_obj
def disable_passphrase(client):
    ret = client.apply_settings(use_passphrase=False)
    output(ret)


@cli.command(help='Set new device label.')
@click.option('-l', '--label')
@click.pass_obj
def set_label(client, label):
    ret = client.apply_settings(label=label)
    output(ret)


@cli.command(help='Set new homescreen.')
@click.option('-f', '--filename', default=None)
@click.pass_obj
def set_homescreen(client, filename):
    if filename is not None:
        from PIL import Image
        im = Image.open(filename)
        if im.size != (128, 64):
            raise CallException(types.Failure_DataError, 'Wrong size of the image')
        im = im.convert('1')
        pix = im.load()
        img = ''
        for j in range(64):
            for i in range(128):
                img += '1' if pix[i, j] else '0'
        img = ''.join(chr(int(img[i:i + 8], 2)) for i in range(0, len(img), 8))
    else:
        img = '\x00'
    ret = client.apply_settings(homescreen=img)
    output(ret)


@cli.command(help='Set U2F counter.')
@click.argument('counter', type=int)
@click.pass_obj
def set_u2f_counter(client, counter):
    ret = client.set_u2f_counter(counter)
    output(ret)


@cli.command(help='Reset device to factory defaults and remove all private data.')
@click.pass_obj
def wipe_device(client):
    ret = client.wipe_device()
    output(ret)


@cli.command(help='Load custom configuration to the device.')
@click.option('-m', '--mnemonic')
@click.option('-e', '--expand', is_flag=True)
@click.option('-x', '--xprv')
@click.option('-p', '--pin', default='')
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.option('-l', '--label', default='')
@click.option('-s', '--skip-checksum', is_flag=True)
@click.pass_obj
def load_device(client, mnemonic, expand, xprv, pin, passphrase_protection, label, skip_checksum):
    if not mnemonic and not xprv:
        raise CallException(types.Failure_DataError, 'Please provide mnemonic or xprv')

    if mnemonic:
        ret = client.load_device_by_mnemonic(
            mnemonic,
            pin,
            passphrase_protection,
            label,
            'english',
            skip_checksum,
            expand
        )
    if xprv:
        ret = client.load_device_by_xprv(
            xprv,
            pin,
            passphrase_protection,
            label,
            'english'
        )
    output(ret)


@cli.command(help='Start safe recovery workflow.')
@click.option('-w', '--words', type=click.Choice([12, 18, 24]), default=24)
@click.option('-e', '--expand', is_flag=True)
@click.option('-p', '--pin-protection', is_flag=True)
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.option('-l', '--label')
@click.option('-t', '--type', 'rec_type', type=click.Choice(['scrambled', 'matrix']), default='scrambled')
@click.option('-d', '--dry-run', is_flag=True)
@click.pass_obj
def recovery_device(client, words, expand, pin_protection, passphrase_protection, label, rec_type, dry_run):
    typemap = {
        'scrambled': types.RecoveryDeviceType_ScrambledWords,
        'matrix':    types.RecoveryDeviceType_Matrix
    }
    ret = client.recovery_device(
        words,
        passphrase_protection,
        pin_protection,
        label,
        'english',
        typemap[rec_type],
        expand,
        dry_run
    )
    output(ret)


@cli.command(help='Perform device setup and generate new seed.')
@click.option('-t', '--strength', type=click.Choice([128, 192, 256]), default=256)
@click.option('-p', '--pin-protection', is_flag=True)
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.option('-l', '--label')
@click.option('-u', '--u2f-counter', default=0)
@click.option('-s', '--skip-backup', is_flag=True)
@click.pass_obj
def reset_device(client, strength, pin_protection, passphrase_protection, label, u2f_counter, skip_backup):
    ret = client.reset_device(
        True,
        strength,
        passphrase_protection,
        pin_protection,
        label,
        'english',
        u2f_counter,
        skip_backup
    )
    output(ret)


@cli.command(help='Perform device seed backup.')
@click.pass_obj
def backup_device(client):
    ret = client.backup_device()
    output(ret)


#
# Firmware update
#


@cli.command(help='Upload new firmware to device (must be in bootloader mode).')
@click.option('-f', '--filename')
@click.option('-u', '--url')
@click.option('-v', '--version')
@click.option('-s', '--skip-check', is_flag=True)
@click.pass_obj
def firmware_update(client, filename, url, version, skip_check):
    if filename:
        fp = open(filename, 'rb').read()
    elif url:
        import requests
        click.echo('Downloading from', url)
        r = requests.get(url)
        fp = r.content
    else:
        import requests
        r = requests.get('https://wallet.trezor.io/data/firmware/releases.json')
        releases = r.json()

        def version_func(r):
            return r['version']

        def version_string(r):
            return '.'.join(map(str, version_func(r)))

        if version:
            release = next((r for r in releases if version_string(r) == version))
        else:
            release = max(releases, key=version_func)
            click.echo('Fetching version: %s' % version_string(release))
        click.echo('Firmware fingerprint: %s' % release['fingerprint'])
        url = 'https://wallet.trezor.io/' + release['url']
        click.echo('Downloading from %s' % url)
        r = requests.get(url)
        fp = r.content

    if not skip_check:
        if fp[:8] == b'54525a52' or fp[:8] == b'54525a56':
            fp = binascii.unhexlify(fp)
        if fp[:4] != b'TRZR' and fp[:4] != b'TRZV':
            raise CallException(types.Failure_FirmwareError, 'TREZOR firmware header expected')

    click.echo('Please confirm action on device...')

    from io import BytesIO
    ret = client.firmware_update(fp=BytesIO(fp))
    output(ret)


@cli.command(help='Perform a self-test.')
@click.pass_obj
def self_test(client):
    ret = client.self_test()
    output(ret)


#
# Basic coin functions
#


@cli.command(help='Get address for specified path.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-n', '--address')
@click.option('-t', '--script-type', type=click.Choice(['address', 'segwit', 'p2shsegwit']), default='address')
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def get_address(client, coin, address, script_type, show_display):
    address_n = client.expand_path(address)
    typemap = {
        'address': types.SPENDADDRESS,
        'segwit': types.SPENDWITNESS,
        'p2shsegwit': types.SPENDP2SHWITNESS,
    }
    script_type = typemap[script_type]
    ret = client.get_address(coin, address_n, show_display, script_type=script_type)
    output(ret)


@cli.command(help='Get public node of given path.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-n', '-address')
@click.option('-e', '--curve')
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def get_public_node(client, coin, address, curve, show_display):
    address_n = client.expand_path(address)
    ret = client.get_public_node(address_n, ecdsa_curve_name=curve, show_display=show_display, coin_name=coin)
    output(ret)


#
# Message functions
#


@cli.command(help='Sign message using address of given path.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-n', '-address')
@click.argument('message')
@click.pass_obj
def sign_message(client, coin, address, message):
    address_n = client.expand_path(address)
    res = client.sign_message(coin, address_n, message)
    ret = {
        'message': message,
        'address': res.address,
        'signature': base64.b64encode(res.signature)
    }
    output(ret)


@cli.command(help='Verify message.')
@click.option('-c', '--coin', default='Bitcoin')
@click.argument('address')
@click.argument('signature')
@click.argument('message')
@click.pass_obj
def verify_message(client, coin, address, signature, message):
    signature = base64.b64decode(signature)
    ret = client.verify_message(coin, address, signature, message)
    output(ret)


@cli.command(help='Encrypt value by given key and path.')
@click.option('-n', '-address')
@click.argument('key')
@click.argument('value')
@click.pass_obj
def encrypt_keyvalue(client, address, key, value):
    address_n = client.expand_path(address)
    res = client.encrypt_keyvalue(address_n, key, value)
    ret = binascii.hexlify(res)
    output(ret)


@cli.command(help='Decrypt value by given key and path.')
@click.option('-n', '-address')
@click.argument('key')
@click.argument('value')
@click.pass_obj
def decrypt_keyvalue(client, address, key, value):
    address_n = client.expand_path(address)
    ret = client.decrypt_keyvalue(address_n, key, value.decode('hex'))
    output(ret)


@cli.command(help='Encrypt message.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-d', '--display-only', is_flag=True)
@click.option('-n', '-address')
@click.argument('pubkey')
@click.argument('message')
@click.pass_obj
def encrypt_message(client, coin, display_only, address, pubkey, message):
    pubkey = binascii.unhexlify(pubkey)
    address_n = client.expand_path(address)
    res = client.encrypt_message(pubkey, message, display_only, coin, address_n)
    ret = {
        'nonce': binascii.hexlify(res.nonce),
        'message': binascii.hexlify(res.message),
        'hmac': binascii.hexlify(res.hmac),
        'payload': base64.b64encode(res.nonce + res.message + res.hmac),
    }
    output(ret)


@cli.command(help='Decrypt message.')
@click.option('-n', '-address')
@click.argument('payload')
@click.pass_obj
def decrypt_message(client, address, payload):
    address_n = client.expand_path(address)
    payload = base64.b64decode(payload)
    nonce, message, msg_hmac = payload[:33], payload[33:-8], payload[-8:]
    ret = client.decrypt_message(address_n, nonce, message, msg_hmac)
    output(ret)


#
# Ethereum functions
#


@cli.command(help='Get Ethereum address in hex encoding.')
@click.option('-n', '-address')
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def ethereum_get_address(client, address, show_display):
    address_n = client.expand_path(address)
    address = client.ethereum_get_address(address_n, show_display)
    ret = '0x%s' % binascii.hexlify(address)
    output(ret)


@cli.command(help='Sign (and optionally publish) Ethereum transaction. Use TO as destination address or set TO to "" for contract creation.')
@click.option('-a', '--host', default='localhost:8545', help='RPC port of ethereum node for automatic gas/nonce estimation')
@click.option('-c', '--chain-id', type=int, help='EIP-155 chain id (replay protection)')
@click.option('-n', '-address', help='BIP-32 path to signing key')
@click.option('-v', '--value', default='0', help='Ether amount to transfer, e.g. "100 milliether"')
@click.option('-g', '--gas-limit', type=int, help='Gas limit - Required for offline signing')
@click.option('-t', '--gas-price', help='Gas price, e.g. "20 nanoether" - Required for offline signing')
@click.option('-i', '--nonce', type=int, help='Transaction counter - Required for offline signing')
@click.option('-d', '--data', default='', help='Data as hex string, e.g. 0x12345678')
@click.option('-p', '--publish', is_flag=True, help='Publish transaction via RPC')
@click.argument('to')
@click.pass_obj
def ethereum_sign_tx(client, host, chain_id, address, value, gas_limit, gas_price, nonce, data, publish, to):
    from ethjsonrpc import EthJsonRpc
    import rlp

    ether_units = {
        'wei':          1,
        'kwei':         1000,
        'babbage':      1000,
        'femtoether':   1000,
        'mwei':         1000000,
        'lovelace':     1000000,
        'picoether':    1000000,
        'gwei':         1000000000,
        'shannon':      1000000000,
        'nanoether':    1000000000,
        'nano':         1000000000,
        'szabo':        1000000000000,
        'microether':   1000000000000,
        'micro':        1000000000000,
        'finney':       1000000000000000,
        'milliether':   1000000000000000,
        'milli':        1000000000000000,
        'ether':        1000000000000000000,
        'eth':          1000000000000000000,
    }

    if ' ' in value:
        value, unit = value.split(' ', 1)
        if unit.lower() not in ether_units:
            raise CallException(types.Failure_DataError, 'Unrecognized ether unit %r' % unit)
        value = int(value) * ether_units[unit.lower()]
    else:
        value = int(value)

    if gas_price is not None:
        if ' ' in gas_price:
            gas_price, unit = gas_price.split(' ', 1)
            if unit.lower() not in ether_units:
                raise CallException(types.Failure_DataError, 'Unrecognized gas price unit %r' % unit)
            gas_price = int(gas_price) * ether_units[unit.lower()]
        else:
            gas_price = int(gas_price)

    if gas_limit is not None:
        gas_limit = int(gas_limit)

    if to.startswith('0x') or to.startswith('0X'):
        to_address = to[2:].decode('hex')
    else:
        to_address = to.decode('hex')

    address_n = client.expand_path(address)
    address = '0x%s' % (binascii.hexlify(client.ethereum_get_address(address_n)),)

    if gas_price is None or gas_limit is None or nonce is None:
        host, port = host.split(':')
        eth = EthJsonRpc(host, int(port))

    if not data:
        data = ''
    elif data.startswith('0x'):
        data = data[2:]
    data = binascii.unhexlify(data)

    if gas_price is None:
        gas_price = eth.eth_gasPrice()

    if gas_limit is None:
        gas_limit = eth.eth_estimateGas(
            to_address=to,
            from_address=address,
            value=('0x%x' % value),
            data='0x' + data)

    if nonce is None:
        nonce = eth.eth_getTransactionCount(address)

    sig = client.ethereum_sign_tx(
        n=address_n,
        nonce=nonce,
        gas_price=gas_price,
        gas_limit=gas_limit,
        to=to_address,
        value=value,
        data=data,
        chain_id=chain_id)

    transaction = rlp.encode(
        (nonce, gas_price, gas_limit, to_address, value, data) + sig)
    tx_hex = '0x%s' % binascii.hexlify(transaction)

    if publish:
        tx_hash = eth.eth_sendRawTransaction(tx_hex)
        ret = 'Transaction published with ID: %s' % tx_hash
    else:
        ret = 'Signed raw transaction: %s' % tx_hex
    output(ret)


#
# Main
#


if __name__ == '__main__':
    cli()