# standard imports
import sys
import signal
import argparse
import confini
import logging
import os
import importlib
import uuid
import datetime

# external imports
import chainlib.cli
import chainsyncer.cli
from chainlib.chain import ChainSpec
from chainlib.eth.connection import EthHTTPConnection
from chainlib.eth.block import block_latest
from hexathon import (
        strip_0x,
        add_0x,
        )
#from chainsyncer.store.fs import SyncFsStore
from chainsyncer.driver.chain_interface import ChainInterfaceDriver
from chainsyncer.error import SyncDone

from eth_cache.rpc import CacheRPC
from eth_cache.store.file import FileStore

# local imports
from eth_monitor.filters.cache import Filter as CacheFilter
from eth_monitor.rules import (
        AddressRules,
        RuleSimple,
        RuleMethod,
        RuleData,
        )
from eth_monitor.filters import RuledFilter
from eth_monitor.filters.out import OutFilter
from eth_monitor.config import override, list_from_prefix
from eth_monitor.callback import (
        BlockCallbackFilter,
        pre_callback,
        post_callback,
        )
from eth_monitor.settings import EthMonitorSettings
import eth_monitor.cli

logging.STATETRACE = 5
logging.basicConfig(level=logging.WARNING)
logg = logging.getLogger()

#default_eth_provider = os.environ.get('RPC_PROVIDER')
#if default_eth_provider == None:
#    default_eth_provider = os.environ.get('ETH_PROVIDER', 'http://localhost:8545')

#exec_dir = os.path.realpath(os.getcwd())
#default_config_dir = os.environ.get('CONFINI_DIR', os.path.join(exec_dir, 'config'))
script_dir = os.path.realpath(os.path.dirname(__file__))
config_dir = os.path.join(script_dir, '..', 'data', 'config')

arg_flags = chainlib.cli.argflag_std_base | chainlib.cli.Flag.CHAIN_SPEC | chainlib.cli.Flag.PROVIDER
argparser = chainlib.cli.ArgumentParser(arg_flags)
eth_monitor.cli.process_flags(argparser, 0)

argparser.add_argument('--store-tx-data', dest='store_tx_data', action='store_true', help='Include all transaction data objects by default')
argparser.add_argument('--store-block-data', dest='store_block_data', action='store_true', help='Include all block data objects by default')
argparser.add_argument('--fresh', action='store_true', help='Do not read block and tx data from cache, even if available')
argparser.add_argument('--list-backends', dest='list_backends', action='store_true', help='List built-in store backends')
argparser.add_argument('-vvv', action='store_true', help='Be incredibly verbose')

sync_flags = chainsyncer.cli.SyncFlag.RANGE | chainsyncer.cli.SyncFlag.HEAD
chainsyncer.cli.process_flags(argparser, sync_flags)

args = argparser.parse_args(sys.argv[1:])

if args.list_backends:
    for v in [
            'fs',
            'rocksdb',
            'mem',
            ]:
        print(v)
    sys.exit(0)

if args.vvv:
    logg.setLevel(logging.STATETRACE)
else:
    logging.getLogger('chainlib.connection').setLevel(logging.WARNING)
    logging.getLogger('chainlib.eth.tx').setLevel(logging.WARNING)
    logging.getLogger('chainsyncer.driver.history').setLevel(logging.WARNING)
    logging.getLogger('chainsyncer.driver.head').setLevel(logging.WARNING)
    logging.getLogger('chainsyncer.backend.file').setLevel(logging.WARNING)
    logging.getLogger('chainsyncer.backend.sql').setLevel(logging.WARNING)
    logging.getLogger('chainsyncer.filter').setLevel(logging.WARNING)

    if args.vv:
        logg.setLevel(logging.DEBUG)
    elif args.v:
        logg.setLevel(logging.INFO)

base_config_dir = [
    chainsyncer.cli.config_dir,
    config_dir,
        ]
config = chainlib.cli.Config.from_args(args, arg_flags, base_config_dir=base_config_dir)
config = chainsyncer.cli.process_config(config, args, sync_flags)
config = eth_monitor.cli.process_config(config, args, 0)


settings = EthMonitorSettings()
settings.process(config)
logg.debug('loaded settings:\n{}'.format(settings))

#rpc_id_generator = None
#if args.seq:
#    rpc_id_generator = IntSequenceGenerator()

#auth = None
#if os.environ.get('RPC_AUTHENTICATION') == 'basic':
#    from chainlib.auth import BasicAuth
#    auth = BasicAuth(os.environ['RPC_USERNAME'], os.environ['RPC_PASSWORD'])
#rpc = EthHTTPConnection(args.p)




def setup_filter(chain_spec, cache_dir, include_tx_data, include_block_data):
    store = None
    if cache_dir == None:
        logg.warning('no cache dir specified, will discard everything!!')
        from eth_cache.store.null import NullStore
        store = NullStore()
    else:
        store = FileStore(chain_spec, cache_dir)
        cache_dir = os.path.realpath(cache_dir)
        if cache_dir == None:
            import tempfile
            cache_dir = tempfile.mkdtemp()
    logg.info('using chain spec {} and store {}'.format(chain_spec, store))
    RuledFilter.init(store, include_tx_data=include_tx_data, include_block_data=include_block_data)

    return store


def setup_cache_filter(rules_filter=None):
    return CacheFilter(rules_filter=rules_filter)


def block_callback(block, tx):
    logg.info('processing {} {}'.format(block, datetime.datetime.fromtimestamp(block.timestamp)))


def main():
    rpc = settings.get('RPC')
    o = block_latest()
    r = rpc.do(o)
    block_offset = int(strip_0x(r), 16) + 1
    logg.info('network block height is {}'.format(block_offset))

    store = setup_filter(
            settings.get('CHAIN_SPEC'),
            config.get('_CACHE_DIR'),
            bool(args.store_tx_data),
            bool(args.store_block_data),
            )

    cache_filter = setup_cache_filter(
            rules_filter=settings.get('RULES'), #address_rules,
            )
     
    filters = [
            cache_filter, 
            ]

    for fltr in list_from_prefix(config, 'filter'):
        m = importlib.import_module(fltr)
        fltr_object = m.Filter(rules_filter=settings.get('RULES'))
        filters.append(fltr_object)
        logg.info('using filter module {}'.format(fltr))

    renderers_mods = []
    for renderer in list_from_prefix(config, 'renderer'):
        m = importlib.import_module(renderer)
        renderers_mods.append(m)
        logg.info('using renderer module {}'.format(renderer))

    block_filter_handler = BlockCallbackFilter()
    for block_filter in list_from_prefix(config, 'block_filter'):
        m = importlib.import_module(block_filter)
        block_filter_handler.register(m)
        logg.info('using block filter module {}'.format(block_filter))

    out_filter = OutFilter(
            settings.get('CHAIN_SPEC'),
            rules_filter=settings.get('RULES'),
            renderers=renderers_mods,
            )
    filters.append(out_filter)

    logg.info('session is {}'.format(settings.get('SESSION_ID')))

    for fltr in filters:
        settings.get('SYNC_STORE').register(fltr)
    drv = ChainInterfaceDriver(
            settings.get('SYNC_STORE'),
            settings.get('SYNCER_INTERFACE'),
            offset=settings.get('SYNCER_OFFSET'),
            target=settings.get('SYNCER_LIMIT'),
            pre_callback=pre_callback,
            post_callback=post_callback,
            block_callback=block_filter_handler.filter,
            )
    
    use_rpc = rpc
    if not args.fresh:
        use_rpc = CacheRPC(rpc, store)
   
    i = 0
    try:
        r = drv.run(use_rpc)
    except SyncDone as e:
        sys.stderr.write("sync {} done at block {}\n".format(drv, e))

    i += 1


if __name__ == '__main__':
    main()