#!/usr/bin/env python
from __future__ import print_function
import os
import binascii
import argparse
import json
import base64
import tempfile
from trezorlib import types_pb2 as types
from io import BytesIO

import sys

from trezorlib.client import TrezorClient, TrezorClientDebug, CallException

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,
}

def init_parser(commands):
    parser = argparse.ArgumentParser(description='Commandline tool for TREZOR devices.')
    parser.add_argument('-v', '--verbose', dest='verbose', action='store_true', help='Prints communication to device')
    parser.add_argument('-t', '--transport', dest='transport', choices=['usb', 'udp', 'pipe', 'bridge'], default='usb', help="Transport used for talking with the device")
    parser.add_argument('-p', '--path', dest='path', default='', help="Path used by the transport")
    parser.add_argument('-j', '--json', dest='json', action='store_true', help="Prints result as json object")

    cmdparser = parser.add_subparsers(title='Available commands')

    for cmd in commands._list_commands():
        func = object.__getattribute__(commands, cmd)

        try:
            arguments = func.arguments
        except AttributeError:
            arguments = ((('params',), {'nargs': '*'}),)

        item = cmdparser.add_parser(cmd, help=func.help)
        for arg in arguments:
            item.add_argument(*arg[0], **arg[1])

        item.set_defaults(func=func)
        item.set_defaults(cmd=cmd)

    return parser

def get_transport(transport_string, path, **kwargs):
    if transport_string == 'usb':
        from trezorlib.transport_hid import HidTransport

        for d in HidTransport.enumerate():
            # Two-tuple of (normal_interface, debug_interface)
            if path == '' or path in d:
                return HidTransport(d, **kwargs)

        raise CallException(types.Failure_Other, "Device not found")

    if transport_string == 'udp':
        from trezorlib.transport_udp import UdpTransport
        return UdpTransport(path, **kwargs)

    if transport_string == 'pipe':
        from trezorlib.transport_pipe import PipeTransport
        if path == '':
            path = '/tmp/pipe.trezor'
        return PipeTransport(path, is_device=False, **kwargs)

    if transport_string == 'bridge':
        from trezorlib.transport_bridge import BridgeTransport

        devices = BridgeTransport.enumerate()
        for d in devices:
            if path == '' or d['path'] == binascii.hexlify(path):
                return BridgeTransport(d, **kwargs)

        raise CallException(types.Failure_Other, "Device not found")

    raise NotImplementedError("Unknown transport")

class Commands(object):
    def __init__(self, client):
        self.client = client

    @classmethod
    def _list_commands(cls):
        return [x for x in dir(cls) if not x.startswith('_')]

    def list(self, args):
        # Fake method for advertising 'list' command
        pass

    def get_address(self, args):
        address_n = self.client.expand_path(args.n)
        return self.client.get_address(args.coin, address_n, args.show_display)

    def ethereum_get_address(self, args):
        address_n = self.client.expand_path(args.n)
        address = self.client.ethereum_get_address(address_n, args.show_display)
        return "0x%s" % (binascii.hexlify(address),)

    def ethereum_sign_tx(self, args):
        from ethjsonrpc import EthJsonRpc
        from ethjsonrpc.utils import hex_to_dec
        import rlp

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

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

        address_n = self.client.expand_path(args.n)
        address = "0x%s" % (binascii.hexlify(self.client.ethereum_get_address(address_n)),)

        host, port = args.host.split(':')
        eth = EthJsonRpc(host, int(port))

        gas_price = eth.eth_gasPrice()
        gas_limit = args.gas
        if args.data.startswith('0x'):
            args.data = args.data[2:]
        data = binascii.unhexlify(args.data)
        if not gas_limit:
            gas_limit = hex_to_dec(eth.eth_estimateGas(
                to_address=args.to,
                from_address=address,
                value=value,
                data="0x"+args.data))
        nonce = eth.eth_getTransactionCount(address)

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

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

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

    def get_entropy(self, args):
        return binascii.hexlify(self.client.get_entropy(args.size))

    def get_features(self, args):
        return self.client.features

    def list_coins(self, args):
        return [coin.coin_name for coin in self.client.features.coins]

    def ping(self, args):
        return self.client.ping(args.msg, button_protection=args.button_protection, pin_protection=args.pin_protection, passphrase_protection=args.passphrase_protection)

    def get_public_node(self, args):
        address_n = self.client.expand_path(args.n)
        return self.client.get_public_node(address_n, ecdsa_curve_name=args.curve, show_display=args.show_display)

    def set_label(self, args):
        return self.client.apply_settings(label=args.label)

    def set_homescreen(self, args):
        if args.filename:
            from PIL import Image
            im = Image.open(args.filename)
            if im.size != (128, 64):
                raise CallException(types.Failure_Other, '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'
        return self.client.apply_settings(homescreen=img)

    def clear_session(self, args):
        return self.client.clear_session()

    def change_pin(self, args):
        return self.client.change_pin(args.remove)

    def wipe_device(self, args):
        return self.client.wipe_device()

    def recovery_device(self, args):
        return self.client.recovery_device(args.words, args.passphrase_protection,
                                           args.pin_protection, args.label, 'english')

    def load_device(self, args):
        if not args.mnemonic and not args.xprv:
            raise CallException(types.Failure_Other, "Please provide mnemonic or xprv")

        if args.mnemonic:
            mnemonic = ' '.join(args.mnemonic)
            return self.client.load_device_by_mnemonic(mnemonic, args.pin,
                                                       args.passphrase_protection,
                                                       args.label, 'english',
                                                       args.skip_checksum)
        else:
            return self.client.load_device_by_xprv(args.xprv, args.pin,
                                                   args.passphrase_protection,
                                                   args.label, 'english')

    def reset_device(self, args):
        return self.client.reset_device(True, args.strength, args.passphrase_protection,
                                        args.pin_protection, args.label, 'english')

    def sign_message(self, args):
        address_n = self.client.expand_path(args.n)
        ret = self.client.sign_message(args.coin, address_n, args.message)
        output = {
            'message': args.message,
            'address': ret.address,
            'signature': base64.b64encode(ret.signature)
        }
        return output

    def verify_message(self, args):
        signature = base64.b64decode(args.signature)
        return self.client.verify_message(args.coin, args.address, signature, args.message)

    def encrypt_message(self, args):
        pubkey = binascii.unhexlify(args.pubkey)
        address_n = self.client.expand_path(args.n)
        ret = self.client.encrypt_message(pubkey, args.message, args.display_only, args.coin, address_n)
        output = {
            'nonce': binascii.hexlify(ret.nonce),
            'message': binascii.hexlify(ret.message),
            'hmac': binascii.hexlify(ret.hmac),
            'payload': base64.b64encode(ret.nonce + ret.message + ret.hmac),
        }
        return output

    def decrypt_message(self, args):
        address_n = self.client.expand_path(args.n)
        payload = base64.b64decode(args.payload)
        nonce, message, msg_hmac = payload[:33], payload[33:-8], payload[-8:]
        ret = self.client.decrypt_message(address_n, nonce, message, msg_hmac)
        return ret

    def encrypt_keyvalue(self, args):
        address_n = self.client.expand_path(args.n)
        ret = self.client.encrypt_keyvalue(address_n, args.key, args.value)
        return binascii.hexlify(ret)

    def decrypt_keyvalue(self, args):
        address_n = self.client.expand_path(args.n)
        ret = self.client.decrypt_keyvalue(address_n, args.key, args.value.decode("hex"))
        return ret

    def set_u2f_counter(self, args):
        ret = self.client.set_u2f_counter(args.counter)
        return ret

    def firmware_update(self, args):
        if args.file:
            fp = open(args.file, 'rb').read()
        elif args.url:
            import requests
            print("Downloading from", args.url)
            r = requests.get(args.url)
            fp = r.content
        else:
            import requests
            r = requests.get('https://wallet.trezor.io/data/firmware/releases.json')
            releases = r.json()
            version = lambda r: r['version']
            version_string = lambda r: ".".join(map(str, version(r)))
            if args.version:
                release = next((r for r in releases if version_string(r) == args.version))
            else:
                release = max(releases, key=version)
                print("No file, url, or version given. Fetching latest version: %s" % version_string(release))
            print("Firmware fingerprint: %s" % release['fingerprint'])
            args.url = 'https://wallet.trezor.io/' + release['url']
            return self.firmware_update(args)

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

        print("Please confirm action on device...")

        return self.client.firmware_update(fp=BytesIO(fp))

    list.help = 'List connected TREZOR USB devices'
    ping.help = 'Send ping message'
    get_address.help = 'Get bitcoin address in base58 encoding'
    ethereum_get_address.help = 'Get Ethereum address in hex encoding'
    ethereum_sign_tx.help = 'Sign (and optionally publish) Ethereum transaction'
    get_entropy.help = 'Get example entropy'
    get_features.help = 'Retrieve device features and settings'
    get_public_node.help = 'Get public node of given path'
    set_label.help = 'Set new wallet label'
    set_homescreen.help = 'Set new homescreen'
    clear_session.help = 'Clear session (remove cached PIN, passphrase, etc.)'
    change_pin.help = 'Change new PIN or remove existing'
    list_coins.help = 'List all supported coin types by the device'
    wipe_device.help = 'Reset device to factory defaults and remove all private data.'
    recovery_device.help = 'Start safe recovery workflow'
    load_device.help = 'Load custom configuration to the device'
    reset_device.help = 'Perform device setup and generate new seed'
    sign_message.help = 'Sign message using address of given path'
    verify_message.help = 'Verify message'
    encrypt_message.help = 'Encrypt message'
    decrypt_message.help = 'Decrypt message'
    encrypt_keyvalue.help = 'Encrypt value by given key and path'
    decrypt_keyvalue.help = 'Decrypt value by given key and path'
    set_u2f_counter.help = 'Set U2F counter'
    firmware_update.help = 'Upload new firmware to device (must be in bootloader mode)'

    clear_session.arguments= ()

    get_address.arguments = (
        (('-c', '--coin'), {'type': str, 'default': 'Bitcoin'}),
        (('-n', '-address'), {'type': str}),
        (('-d', '--show-display'), {'action': 'store_true', 'default': False}),
    )

    ethereum_get_address.arguments = (
        (('-n', '-address'), {'type': str}),
        (('-d', '--show-display'), {'action': 'store_true', 'default': False}),
    )

    ethereum_sign_tx.arguments = (
        (('-a', '--host'), {'type': str, 'default': 'localhost:8545'}),
        (('-n', '-address'), {'type': str}),
        (('-v', '--value'), {'type': str, 'default': "0"}),
        (('-g', '--gas'), {'type': int}),
        (('-d', '--data'), {'type': str, 'default': ''}),
        (('-p', '--publish'), {'action': 'store_true', 'default': False}),
        (('to',), {'type': str}),
    )

    get_entropy.arguments = (
        (('size',), {'type': int}),
    )

    get_features.arguments = ()

    list_coins.arguments = ()

    ping.arguments = (
        (('msg',), {'type': str}),
        (('-b', '--button-protection'), {'action': 'store_true', 'default': False}),
        (('-p', '--pin-protection'), {'action': 'store_true', 'default': False}),
        (('-r', '--passphrase-protection'), {'action': 'store_true', 'default': False}),
    )

    set_label.arguments = (
        (('-l', '--label',), {'type': str, 'default': ''}),
        # (('-c', '--clear'), {'action': 'store_true', 'default': False})
    )

    set_homescreen.arguments = (
        (('-f', '--filename',), {'type': str, 'default': ''}),
    )
    change_pin.arguments = (
        (('-r', '--remove'), {'action': 'store_true', 'default': False}),
    )

    wipe_device.arguments = ()

    recovery_device.arguments = (
        (('-w', '--words'), {'type': int, 'choices': [12, 18, 24], 'default': 24}),
        (('-p', '--pin-protection'), {'action': 'store_true', 'default': False}),
        (('-r', '--passphrase-protection'), {'action': 'store_true', 'default': False}),
        (('-l', '--label'), {'type': str, 'default': ''}),
    )

    load_device.arguments = (
        (('-m', '--mnemonic'), {'type': str, 'nargs': '+'}),
        (('-x', '--xprv'), {'type': str}),
        (('-p', '--pin'), {'type': str, 'default': ''}),
        (('-r', '--passphrase-protection'), {'action': 'store_true', 'default': False}),
        (('-l', '--label'), {'type': str, 'default': ''}),
        (('-s', '--skip-checksum'), {'action': 'store_true', 'default': False}),
    )

    reset_device.arguments = (
        (('-t', '--strength'), {'type': int, 'choices': [128, 192, 256], 'default': 256}),
        (('-p', '--pin-protection'), {'action': 'store_true', 'default': False}),
        (('-r', '--passphrase-protection'), {'action': 'store_true', 'default': False}),
        (('-l', '--label'), {'type': str, 'default': ''}),
    )

    sign_message.arguments = (
        (('-c', '--coin'), {'type': str, 'default': 'Bitcoin'}),
        (('-n', '-address'), {'type': str}),
        (('message',), {'type': str}),
    )

    encrypt_message.arguments = (
        (('pubkey',), {'type': str}),
        (('message',), {'type': str}),
        (('-d', '--display-only'), {'action': 'store_true', 'default': False}),
        (('-c', '--coin'), {'type': str, 'default': 'Bitcoin'}),
        (('-n', '-address'), {'type': str}),
    )

    decrypt_message.arguments = (
        (('-n', '-address'), {'type': str}),
        (('payload',), {'type': str}),
    )

    verify_message.arguments = (
        (('-c', '--coin'), {'type': str, 'default': 'Bitcoin'}),
        (('address',), {'type': str}),
        (('signature',), {'type': str}),
        (('message',), {'type': str}),
    )

    encrypt_keyvalue.arguments = (
        (('-n', '-address'), {'type': str}),
        (('key',), {'type': str}),
        (('value',), {'type': str}),
    )

    decrypt_keyvalue.arguments = (
        (('-n', '-address'), {'type': str}),
        (('key',), {'type': str}),
        (('value',), {'type': str}),
    )

    get_public_node.arguments = (
        (('-n', '-address'), {'type': str}),
        (('-e', '--curve'), {'type': str}),
        (('-d', '--show-display'), {'action': 'store_true', 'default': False}),
    )

    set_u2f_counter.arguments = (
        (('counter',), {'type': int}),
    )

    firmware_update.arguments = (
        (('-f', '--file'), {'type': str}),
        (('-u', '--url'), {'type': str}),
        (('-n', '--version'), {'type': str}),
        (('-s', '--skip-check'), {'action': 'store_true', 'default': False}),
    )

def list_usb():
    from trezorlib.transport_hid import HidTransport
    return HidTransport.enumerate()

def main():
    parser = init_parser(Commands)
    args = parser.parse_args()

    if not hasattr(args, 'cmd'):
        parser.print_help()
        exit(0)

    try:

        if args.cmd == 'list':
            devices = list_usb()
            if args.json:
                print(json.dumps(devices))
            else:
                for dev in devices:
                    if dev[1] != None:
                        print("%s - debuglink enabled" % dev[0])
                    else:
                        print(dev[0])
            return

        transport = get_transport(args.transport, args.path)
        if args.verbose:
            client = TrezorClientDebug(transport)
        else:
            client = TrezorClient(transport)

        cmds = Commands(client)

        res = args.func(cmds, args)

        if args.json:
            print(json.dumps(res, sort_keys=True, indent=4))
        else:
            print(res)
    except CallException as e:
        status, message = e.args
        sys.stderr.write('failure: {message}\n'.format(message=message))
        exit(status)


if __name__ == '__main__':
    main()