# standard imports
import logging

# external imports
from chainlib.eth.address import to_checksum_address
from hexathon import strip_0x
from eth_accounts_index import AccountsIndex
from eth_faucet import EthFaucet

# local imports
from gas3.error import InvalidInput
from gas3.error import Used
from gas3.base import check

logg = logging.getLogger(__name__)


def register_address(settings, address):
    c = AccountsIndex(
            settings.get('CHAIN_SPEC'),
            signer=settings.get('SIGNER'),
            gas_oracle=settings.get('FEE_ORACLE'),
            nonce_oracle=settings.get('NONCE_ORACLE'),
            )
    (tx_hash, o) = c.add(settings.get('ACCOUNTS_CONTRACT'), settings.get('SENDER_ADDRESS'), address)
    r = settings.get('CONN').do(o)
    logg.debug('registry tx for {}: {}'.format(address, tx_hash))

    c = EthFaucet(
            settings.get('CHAIN_SPEC'),
            signer=settings.get('SIGNER'),
            gas_oracle=settings.get('FEE_ORACLE'),
            nonce_oracle=settings.get('NONCE_ORACLE'),
            )
    (tx_hash, o) = c.give_to(settings.get('FAUCET_CONTRACT'), settings.get('SENDER_ADDRESS'), address)
    r = settings.get('CONN').do(o)
    logg.debug('faucet tx for {}: {}'.format(address, tx_hash))

    return tx_hash


def do_register(req, env, data_dir, settings):
    i = req.path.find('/', 1)
    if i == -1:
        raise InvalidInput(env.path)
    p = req.path[i+1:]
    r = None
    r = check(p, data_dir)
    if not r:
        raise Used('already used: ' + p)
   
    v = env['wsgi.input'].read(42)
    if type(v) == bytes:
        v = v.decode('utf-8')
    try:
        v = strip_0x(v)
        v = to_checksum_address(v)
    except:
        raise InvalidInput('invalid address: ' + str(v))

    data_dir.add(p, bytes.fromhex(v))
    tx_hash = register_address(settings, v)
    return tx_hash