import populus
import threading
import nkms_eth
import appdirs
from os.path import dirname, join, abspath

DEFAULT_NETWORK = 'mainnetrpc'
PYTHON_PROJECT_NAME = 'nucypher-kms'
TIMEOUT = 60
_project = threading.local()

# This config is persistent and is created in user's .local directory
REGISTRAR_PATH = join(appdirs.user_data_dir(PYTHON_PROJECT_NAME),
                      'registrar.json')


def project():
    # Hardcoded the config for the project
    # It will read user-specific configs also which may override it
    if not hasattr(_project, 'project'):
        project_dir = join(dirname(abspath(nkms_eth.__file__)), 'project')
        project = populus.Project(project_dir)
        project.config['chains.mainnetrpc']['contracts']['backends']['JSONFile']['settings']['file_path'] = REGISTRAR_PATH
        _project.project = project
    return _project.project


def get_chain(name=None):
    return project().get_chain(name or DEFAULT_NETWORK)


def chain(name=None):
    if not hasattr(_project, 'chain'):
        _project.chain = get_chain(name).__enter__()
    return _project.chain


def disconnect():
    _project.chain.__exit__(None, None, None)
    if hasattr(_project, 'project'):
        delattr(_project, 'project')
    if hasattr(_project, 'chain'):
        delattr(_project, 'chain')
    if hasattr(_project, 'web3'):
        delattr(_project, 'web3')


def web3():
    return chain().web3