import json
import logging
import sys
import uuid

import cic_eth.cli
import redis
from cic_eth.api.api_task import Api
from cic_eth.server.config import config

log = logging.getLogger(__name__)

celery_app = cic_eth.cli.CeleryApp.from_config(config)
celery_app.set_default()

chain_spec = config.get('CHAIN_SPEC')
celery_queue = config.get('CELERY_QUEUE')

redis_host = config.get('REDIS_HOST')
redis_port = config.get('REDIS_PORT')
redis_db = config.get('REDIS_DB')


def call(method, *args, **kwargs):
    """ Creates a redis channel and calls `cic_eth.api` with the provided `method` and `*args`. Returns the result of the api call
    """
    redis_channel = str(uuid.uuid4())
    r = redis.Redis(redis_host, redis_port, redis_db)
    ps = r.pubsub()
    ps.subscribe(redis_channel)
    api = Api(
        chain_spec,
        queue=celery_queue,
        callback_param='{}:{}:{}:{}'.format(
            redis_host, redis_port, redis_db, redis_channel),
        callback_task='cic_eth.callbacks.redis.redis',
        callback_queue=celery_queue,
    )
    getattr(api, method)(*args, **kwargs)

    ps.get_message()
    try:
        o = ps.get_message(timeout=config.get('REDIS_TIMEOUT'))
    except TimeoutError as e:
        sys.stderr.write(
            f"cic_eth.api.{method}({args}, {kwargs}) timed out:\n {e}")
        sys.exit(1)

    log.debug(
        f"cic_eth.api.{method}(args={args}, kwargs={kwargs})\n {o}")

    ps.unsubscribe()
    try:
        result = json.loads(o['data'])["result"]
        return result

    except Exception as e:
        sys.stderr.write(
            f'Unable to parse Data:\n{o}\n Error:\n{e}')
        return None