import json
import os
import traceback
from queue import Queue
from threading import Thread

import redis

from gabtv import GabTvScanner, item_type
from post_process import post_process
from state import GabTvState
from util import logger

REDIS_HOST = os.environ.get("GTV_REDIS_HOST", "localhost")
REDIS_PORT = os.environ.get("GTV_REDIS_PORT", 6379)
PF_PUBLISH = os.environ.get("GTV_PUBLISH", False)
GTV_RPS = os.environ.get("GTV_RPS", 1)

ARC_LISTS = os.environ.get("GTV_ARC_LISTS", "arc").split(",")


def publish_worker(queue: Queue):
    while True:
        try:
            item = queue.get()
            if item is None:
                break
            publish(item)

        except Exception as e:
            logger.error(str(e) + ": " + traceback.format_exc())
        finally:
            queue.task_done()


def once(func):
    def wrapper(item):
        if not state.has_visited(item["_id"]):
            func(item)
            state.mark_visited(item["_id"])

    return wrapper


@once
def publish(item):
    post_process(item)

    itm_type = item_type(item)
    routing_key = "%s.x" % (itm_type,)

    message = json.dumps(item, separators=(',', ':'), ensure_ascii=False, sort_keys=True)
    if PF_PUBLISH:
        rdb.publish("gtv." + routing_key, message)
    for arc in ARC_LISTS:
        rdb.lpush(arc + ".gtv." + routing_key, message)


if __name__ == "__main__":

    state = GabTvState("gtv", REDIS_HOST, REDIS_PORT)
    rdb = redis.Redis(host=REDIS_HOST, port=REDIS_PORT)

    publish_q = Queue()
    publish_thread = Thread(target=publish_worker, args=(publish_q,))
    publish_thread.setDaemon(True)
    publish_thread.start()

    s = GabTvScanner(state, GTV_RPS)

    while True:
        try:
            for item in s.all_items():
                publish_q.put(item)
        except KeyboardInterrupt as e:
            print("cleanup..")
            for _ in range(3):
                publish_q.put(None)
            break