#!/usr/bin/env python3

import os
import sys
import json
import psycopg2
import paho.mqtt.client as mqtt

mqtt_server = os.environ['el_mqtt_server']
mqtt_port = int(os.environ['el_mqtt_port'])
keepalive = int(os.environ['el_mqtt_keepalive'])
mqtt_topic = os.environ['el_mqtt_topic']

pg_db = os.environ['el_pg_db']
pg_host = os.environ['el_pg_host']
pg_user = os.environ['el_pg_user']
pg_pass = os.environ['el_pg_pass']
pg_table = "mqtt_temps"


# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))

    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe(mqtt_topic)

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    if msg.topic.startswith('zigbee2mqtt/tmp'):
        #print("TMP!! - " + msg.topic.split('/')[1])
        data = json.loads(msg.payload)
        if 'temperature' in data and 'humidity' in data:
            values = (msg.topic.split('/')[1], data['temperature'], data['humidity'], data['battery'], data['linkquality'], data['voltage'])
            print(values)
            todb(values)

# Write values to database
def todb(values):
    conn = psycopg2.connect(database=pg_db, host=pg_host, user=pg_user, password=pg_pass)
    cur = conn.cursor()
    try:
        cur.execute("INSERT INTO " + pg_table + " (name, temperature, humidity, battery, linkquality, voltage) VALUES(%s,%s,%s,%s,%s,%s)", values)
        conn.commit()
    except (Exception, psycopg2.Error) as error:
        conn.rollback()
        print("Error while connecting to PostgreSQL", error)
        raise error
    finally:
        cur.close()
        conn.close()



# mqtt
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.connect(mqtt_server, mqtt_port, keepalive)

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()