# standard imports
import logging

# external imports
from eth_contract_registry import Registry
from eth_token_index import TokenUniqueSymbolIndex
from chainlib.eth.gas import OverrideGasOracle
from chainlib.eth.nonce import OverrideNonceOracle
from eth_erc20 import ERC20
from chainlib.eth.tx import (
        count,
        TxFormat,
        )

logg = logging.getLogger().getChild(__name__)


class BalanceProcessor:

    def __init__(self, conn, chain_spec, registry_address, signer_address, signer):

        self.chain_spec = chain_spec
        self.conn = conn
        #self.signer_address = signer_address
        self.registry_address = registry_address

        self.token_index_address = None
        self.token_address = None
        self.signer_address = signer_address
        self.signer = signer

        o = count(signer_address)
        c = self.conn.do(o)
        self.nonce_offset = int(c, 16)
        self.gas_oracle = OverrideGasOracle(conn=conn, limit=8000000)

        self.value_multiplier = 1
    

    def init(self, token_symbol):
        # Get Token registry address
        registry = Registry(self.chain_spec)
        o = registry.address_of(self.registry_address, 'TokenRegistry')
        r = self.conn.do(o)
        self.token_index_address = registry.parse_address_of(r)
        logg.info('found token index address {}'.format(self.token_index_address))

        token_registry = TokenUniqueSymbolIndex(self.chain_spec)
        o = token_registry.address_of(self.token_index_address, token_symbol)
        r = self.conn.do(o)
        self.token_address = token_registry.parse_address_of(r)
        logg.info('found SRF token address {}'.format(self.token_address))

        tx_factory = ERC20(self.chain_spec)
        o = tx_factory.decimals(self.token_address)
        r = self.conn.do(o)
        n = tx_factory.parse_decimals(r)
        self.value_multiplier = 10 ** n


    def get_rpc_tx(self, recipient, value, i):
        logg.debug('initiating nonce offset {} for recipient {}'.format(self.nonce_offset + i, recipient))
        nonce_oracle = OverrideNonceOracle(self.signer_address, self.nonce_offset + i)
        tx_factory = ERC20(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle, gas_oracle=self.gas_oracle)
        return tx_factory.transfer(self.token_address, self.signer_address, recipient, value, tx_format=TxFormat.RLP_SIGNED)
        #(tx_hash_hex, o) = tx_factory.transfer(self.token_address, self.signer_address, recipient, value)
        #self.conn.do(o)
        #return tx_hash_hex


    def get_decimal_amount(self, value):
        return value * self.value_multiplier