# standard imports
import logging

# external imports
import chainlib.eth.cli
from chainlib.chain import ChainSpec
from chainsyncer.backend.file import FileBackend
from chainlib.interface import ChainInterface
from chainlib.eth.block import (
        block_latest,
        block_by_number,
        Block,
        )
from chainlib.eth.tx import (
        receipt,
        Tx,
        )
from chainsyncer.driver.history import HistorySyncer
from chainsyncer.driver.head import HeadSyncer
from hexathon import (
        strip_0x,
        uniform as hex_uniform,
        )


logging.basicConfig(level=logging.WARNING)
logg = logging.getLogger()


arg_flags = chainlib.eth.cli.argflag_std_read
argparser = chainlib.eth.cli.ArgumentParser(arg_flags)
argparser.add_argument('--start', type=int, help='start at block') 
argparser.add_argument('--end', type=int, help='end block (not inclusive)') 
argparser.add_argument('--interval', type=int, default=5, help='syncer poll interval for new blocks')
argparser.add_argument('-d', type=str, required=True, help='output directory')
argparser.add_positional('address', type=str, append=True, help='address sender to monitor')
args = argparser.parse_args()

extra_args = {
    'start': None,
    'end': None,
    'address': None,
    'd': '_OUTPUT_DIR',
    'interval': 'SYNCER_LOOP_INTERVAL',
        }
# process config
config = chainlib.eth.cli.Config.from_args(args, arg_flags, extra_args=extra_args)
logg.debug('config loaded\n'+ str(config))

# set up rpc
rpc = chainlib.eth.cli.Rpc()
conn = rpc.connect_by_config(config)

chain_spec = ChainSpec.from_chain_str(config.get('CHAIN_SPEC'))


class EthChainInterface(ChainInterface):

    def __init__(self):
        self._block_by_number = block_by_number
        self._block_from_src = Block.from_src
        self._tx_receipt = receipt
        self._src_normalize = Tx.src_normalize


class GasAddFilter:

    def __init__(self, chain_spec, addresses):
        self.addresses = []
        for address in addresses:
            clean_address = hex_uniform(strip_0x(address))
            self.addresses.append(clean_address)
            logg.debug('added {} to gas sum filter'.format(clean_address))
        self.tx_gas = {}
        self.gas_sum = 0
       

    def filter(self, conn, block, tx, db_session):
        sender = hex_uniform(strip_0x(tx.outputs[0]))
        if sender in self.addresses:
            self.gas_sum += tx.gas_used
            self.tx_gas[tx.hash] = tx.gas_used
            logg.info('sender {} tx {} gas {} new sum {}'.format(sender, tx.hash, tx.gas_used, self.gas_sum))


    def sum(self):
        return self.gas_sum


def main():
    loop_interval = config.get('SYNCER_LOOP_INTERVAL')
    start = config.get('_START')
    if start == None:
        o = block_latest()
        r = conn.do(o)
        block_current = int(r, 16)
        start = block_current + 1
    end = config.get('_END')

    syncer = None
    chain_interface = EthChainInterface()
    if end != None:
        backend = FileBackend.initial(chain_spec, end, start_block_height=start, base_dir=config.get('_OUTPUT_DIR'))
        syncer = HistorySyncer(backend, chain_interface)
    else:
        backend = FileBackend.live(chain_spec, start, base_dir=config.get('_OUTPUT_DIR'))
        syncer = HeadSyncer(backend, chain_interface)

    gas_filter = GasAddFilter(chain_spec, config.get('_ADDRESS'))
    syncer.add_filter(gas_filter)

    r = syncer.loop(config.get('SYNCER_LOOP_INTERVAL'), conn)
    for k in gas_filter.tx_gas.keys():
        print('tx {} gas {}'.format(k, gas_filter.tx_gas[k]))
    print('total gas: ' + str(gas_filter.sum()))


if __name__ == '__main__':
    main()