import paho.mqtt.client as mqtt
import json
import os
import logging
import signal
import requests
from datetime import datetime
from influxdb import InfluxDBClient
from dotenv import find_dotenv, load_dotenv

load_dotenv(find_dotenv())
SRC_MQTT_HOST = os.getenv("SRC_MQTT_HOST")
SRC_MQTT_USER = os.getenv("SRC_MQTT_USER")
SRC_MQTT_PASS = os.getenv("SRC_MQTT_PASS")
DST_MQTT_HOST = os.getenv("DST_MQTT_HOST")
DST_MQTT_USER = os.getenv("DST_MQTT_USER")
DST_MQTT_PASS = os.getenv("DST_MQTT_PASS")
DST_INFLUX_HOST = os.getenv("DST_INFLUX_HOST")
DST_INFLUX_USER = os.getenv("DST_INFLUX_USER")
DST_INFLUX_PASS = os.getenv("DST_INFLUX_PASS")
DST_INFLUX_DB = os.getenv("DST_INFLUX_DB")
HC_PING_URL = os.getenv("HC_PING_URL")
VERSION = "v2.0"

OT_TOPIC="owntracks/tobru/dragino"
OT_TID="dragino"

def on_connect_ttn(client, userdata, flags, rc):
    logging.info("connected to ttn %s - %s", SRC_MQTT_HOST, str(rc))
    client.subscribe("+/devices/+/up")

def on_connect_ot(client, userdata, flags, rc):
    logging.info("connected to ot %s - %s", DST_MQTT_HOST, str(rc))

def on_publish_ot(client, userdata, rc):
    logging.info("published data to ot")

def on_log(client, userdata, level, buf):
    logging_level = mqtt.LOGGING_LEVEL[level]
    logging.log(logging_level, buf)
    #logging.info("got a log message level %s: %s", level, str(buf))
    if "PINGRESP" in str(buf):
        # report to https://healthchecks.io to tell that the connection is alive
        requests.get(HC_PING_URL)

# The callback for when a PUBLISH message is received from the server.
def on_message_ttn(client, userdata, msg):
    data = json.loads(msg.payload)
    logging.info("message from ttn received for %s - #%s", data["dev_id"], data["counter"])

    # retrieve info about gateway
    gtw_id = data["metadata"]["gateways"][0]["gtw_id"]
    try:
        gtw_info = requests.get("https://www.thethingsnetwork.org/gateway-data/gateway/"+gtw_id).json()
        logging.info("received via gw %s, %s, owned by %s",
            data["metadata"]["gateways"][0]["gtw_id"],
            gtw_info[gtw_id]["description"],
            gtw_info[gtw_id]["owner"],
        )
    except:
        logging.info("received via gw %s", gtw_id)

    # max is 4 volts, 3 volts is considered empty
    batpercent = round((data["payload_fields"]["BatV"] - 3) * 100)

    if data["payload_fields"]["ALARM_status"]:
        logging.info("Red button pushed!")

    logging.info("Motion detection: %s", data["payload_fields"]["MD"])
    logging.info("LED status for position: %s", data["payload_fields"]["LON"])
    logging.info("Firmware version: %s", data["payload_fields"]["FW"])

    got_fix = False
    if data["payload_fields"]["Latitude"] == 0:
        logging.info("no GPS data (Latitude) present")
        # set GPS data to 0 for InfluxDB
        data["payload_fields"]["Latitude"] = 0.0
        data["payload_fields"]["Longitude"] = 0.0
    else:
        logging.info("GPS data (Latitude) present: lat %s, lon %s",
          data["payload_fields"]["Latitude"],
          data["payload_fields"]["Longitude"]
        )
        got_fix = True
        # transform received data into OwnTracks format
        ot_data = json.dumps({
            "_type": "location",
            "lat": data["payload_fields"]["Latitude"],
            "lon": data["payload_fields"]["Longitude"],
            "batt": batpercent,
            "t": "p",
            "tid": OT_TID,
            "tst": int(datetime.timestamp(datetime.now())),
            "conn": "m",
        })

        # publish to owntracks
        logging.info("publishing data to owntracks via mqtt to topic %s", OT_TOPIC)
        client_ot.publish(OT_TOPIC, payload=ot_data, retain=True, qos=1)

    # write to influxdb
    logging.info("writing data to influxdb")
    influxdb.write_points(
        [{
            "measurement": "dragino",
            "tags": {
                "device": "lgt92",
            },
            "fields": {
                "bat": float(data["payload_fields"]["BatV"]),
                "pitch": float(data["payload_fields"]["Pitch"]),
                "roll": float(data["payload_fields"]["Roll"]),
                "lat": float(data["payload_fields"]["Latitude"]),
                "lon": float(data["payload_fields"]["Longitude"]),
                "alarm": int(data["payload_fields"]["ALARM_status"]),
                "counter": data["counter"],
                "airtime": data["metadata"]["airtime"],
                "rssi": data["metadata"]["gateways"][0]["rssi"],
                "fix": got_fix,
            }
        }]
    )

    logging.info("data processing done")

def shutdown():
    logging.info("disconnecting from mqtt")
    client_ot.disconnect()
    client_ot.loop_stop()
    client_ttn.disconnect()
    client_ttn.loop_stop()

def handleSIGTERM(signalNumber, frame):
    logging.info("got SIGTERM")
    shutdown()
    return

if __name__ == '__main__':

    signal.signal(signal.SIGTERM, handleSIGTERM)

    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S %Z'
    )

    logging.info("Starting ioteer lgt92. "+VERSION)

    # Prepare InfluxDB
    influxdb = InfluxDBClient(
            host=DST_INFLUX_HOST,
            port=443,
            database=DST_INFLUX_DB,
            username=DST_INFLUX_USER,
            password=DST_INFLUX_PASS,
            ssl=True,
            verify_ssl=True,
    )

    # Prepare MQTT for The Things Network
    client_ttn = mqtt.Client()
    client_ttn.enable_logger()
    client_ttn.on_connect = on_connect_ttn
    client_ttn.on_message = on_message_ttn
    client_ttn.on_log = on_log
    client_ttn.username_pw_set(SRC_MQTT_USER,SRC_MQTT_PASS)
    client_ttn.tls_set()
    client_ttn.connect(SRC_MQTT_HOST, 8883, 60)

    # Prepare MQTT for OwnTracks
    ot_lwt = json.dumps({
        "_type": "lwt",
        "tst": int(datetime.timestamp(datetime.now())),
    })
    client_ot = mqtt.Client()
    client_ot.enable_logger()
    client_ot.on_connect = on_connect_ot
    client_ot.on_publish = on_publish_ot
    client_ot.on_log = on_log
    client_ot.username_pw_set(DST_MQTT_USER,DST_MQTT_PASS)
    client_ot.tls_set()
    client_ot.will_set(OT_TOPIC, payload=ot_lwt, qos=1, retain=True)
    client_ot.connect(DST_MQTT_HOST, 8883, 60)

    try:
        # Connect to MQTT and react to messages
        client_ot.loop_start()
        client_ttn.loop_forever()
    except KeyboardInterrupt:
        shutdown()
        logging.info("tschuess")