import logging
import os
import pickle
import sys
import time
from datetime import datetime

import numpy as np
import paho.mqtt.client as mqtt
from redis import Redis

from lib.tecmap import plot_tec_map

logging.basicConfig(level=logging.INFO)

MQTT_BROKER_HOST = os.getenv('MQTT_BROKER_HOST', '')
MQTT_BROKER_PORT = int(os.getenv('MQTT_BROKER_PORT', 1883))
MQTT_CLIENT_ID = os.getenv('MQTT_CLIENT_ID', 'space_weather')
MQTT_USERNAME = os.getenv('MQTT_USERNAME', '')
MQTT_PASSWORD = os.getenv('MQTT_PASSWORD', '')
MQTT_TOPIC_PREFIX = os.getenv('MQTT_TOPIC_PREFIX', 'space-weather')

LAT_RANGE_MIN = os.getenv('LAT_RANGE_MIN')
LAT_RANGE_MAX = os.getenv('LAT_RANGE_MAX')
LON_RANGE_MIN = os.getenv('LON_RANGE_MIN')
LON_RANGE_MAX = os.getenv('LON_RANGE_MAX')
if not LAT_RANGE_MIN or not LAT_RANGE_MAX or not LON_RANGE_MIN or not LON_RANGE_MAX:
    logging.critical('Must set LAT_RANGE_MIN, LAT_RANGE_MAX, LON_RANGE_MIN, and LON_RANGE_MAX environment variables')
    print(LAT_RANGE_MIN, LAT_RANGE_MAX, LON_RANGE_MIN, LON_RANGE_MAX)
    sys.exit(1)

CDDIS_USERNAME = os.getenv('CDDIS_USERNAME')
CDDIS_PASSWORD = os.getenv('CDDIS_PASSWORD')
if not CDDIS_USERNAME or not CDDIS_PASSWORD:
    logging.critical('Must set CDDIS_USERNAME and CDDIS_PASSWORD environment variables')
    sys.exit(1)

client = mqtt.Client(client_id=MQTT_CLIENT_ID)
if MQTT_USERNAME and MQTT_PASSWORD:
    client.username_pw_set(MQTT_USERNAME, MQTT_PASSWORD)
client.will_set(MQTT_TOPIC_PREFIX + '/status', payload='Offline', qos=1, retain=True)
client.connect(MQTT_BROKER_HOST, port=MQTT_BROKER_PORT)
client.loop_start()


def publish(topic: str, msg):
    topic_expanded = MQTT_TOPIC_PREFIX + '/' + topic
    retries = 10
    for i in range(retries):  # retry
        result = client.publish(topic_expanded, msg)
        status = result[0]
        if status == 0:
            logging.info(f'Sent {msg} to topic {topic_expanded}')
            return
        else:
            logging.warning(f'Failed to send message to topic {topic_expanded}: {result}. Retry {i + 1}/{retries}')
            time.sleep(10)
    logging.error(f'Failed to send message to topic {topic_expanded}.')


def main():
    redis = Redis(host='localhost', port=6379, db=0)

    while True:
        data = redis.get('tecmap_data')
        while data is None:
            logging.warning('Redis has not been populated yet. Is cache.py running? Sleeping 10s...')
            time.sleep(10)
            data = redis.get('tecmap_data')
        ionex_data = pickle.loads(data)

        utc_hr = datetime.utcnow().hour
        logging.info(f'Using hour {utc_hr}')

        avg_tec = None
        for tecmap, epoch in ionex_data:
            if epoch.hour == utc_hr:
                avg_tec = np.mean(plot_tec_map(tecmap, [float(LON_RANGE_MIN), float(LON_RANGE_MAX)], [float(LAT_RANGE_MIN), float(LAT_RANGE_MAX)])[0])
                logging.info(f'Data timestamp: {epoch.isoformat()}')
                break
        latest = round(avg_tec, 1)
        publish('vtec', latest)
        time.sleep(60)


if __name__ == '__main__':
    main()