# standard imports
import logging

# external imports
from cic_registry import CICRegistry
from cic_registry.registry import from_identifier
from chainlib.chain import ChainSpec
from cic_registry.chain import ChainRegistry
from cic_registry.helper.declarator import DeclaratorOracleAdapter

logg = logging.getLogger(__name__)


def safe_registry(w3):
    """Temporary workaround for enabling thread-safe usage of the CICRegistry.
    """
    CICRegistry.w3 = w3
    return CICRegistry


def init_registry(config, w3, auto_populate=True):
    chain_spec = ChainSpec.from_chain_str(config.get('CIC_CHAIN_SPEC'))
    CICRegistry.init(w3, config.get('CIC_REGISTRY_ADDRESS'), chain_spec)
    CICRegistry.add_path(config.get('ETH_ABI_DIR'))

    chain_registry = ChainRegistry(chain_spec)
    CICRegistry.add_chain_registry(chain_registry, True)

    declarator = CICRegistry.get_contract(chain_spec, 'AddressDeclarator', interface='Declarator')
    trusted_addresses_src = config.get('CIC_TRUST_ADDRESS')
    if trusted_addresses_src == None:
        raise ValueError('At least one trusted address must be declared in CIC_TRUST_ADDRESS')
    trusted_addresses = trusted_addresses_src.split(',')
    for address in trusted_addresses:
        logg.info('using trusted address {}'.format(address))

    oracle = DeclaratorOracleAdapter(declarator.contract, trusted_addresses)
    chain_registry.add_oracle(oracle, 'naive_erc20_oracle')

    if auto_populate:
        populate(chain_spec, w3)

    return CICRegistry


def populate(chain_spec, w3):
    registry = CICRegistry.get_contract(chain_spec, 'CICRegistry')
    fn = registry.function('identifiers')
    i = 0
    token_registry_contract = None
    while True:
        identifier_hex = None
        try:
            identifier_hex = fn(i).call()
        except ValueError:
            break
        identifier = from_identifier(identifier_hex)

        i += 1
        try:
            if identifier == 'TokenRegistry':
                c = CICRegistry.get_contract(chain_spec, identifier, interface='RegistryClient')
                token_registry_contract = c
            else:
                c = CICRegistry.get_contract(chain_spec, identifier)
            logg.info('found token registry contract {}'.format(c.address()))
        except ValueError:
            logg.error('contract for identifier {} not found'.format(identifier))
            continue

    fn = token_registry_contract.function('entry')
    i = 0
    while True:
        token_address = None
        try:
            token_address = fn(i).call()
        except ValueError:
            break
        CICRegistry.get_address(chain_spec, token_address)
        i += 1