# standard imports
import logging
from urllib.parse import urlparse

logg = logging.getLogger(__name__)


def from_cache_spec(chain_spec, s):
    o = urlparse(s)
    path = '.'
    scheme = None
    if o.scheme == '':
        scheme = 'file'
    else:
        scheme = o.scheme

    if o.path != '':
        if o.path[0] != '/':
            path = os.path.join(path, o.path)
        else:
            path = o.path

    logg.debug('parsed scheme {} from cache spec'.format(scheme))

    if scheme == 'file':
        from eth_cache.store.fs import FileStore
        return FsStore(chain_spec, cache_root=path)
       
    if scheme == 'lmdb':
        from eth_cache.store.lmdb import LmdbStore
        return LmdbStore(chain_spec, cache_root=path)

    return None