"""
created by waldluis

This file contains the main script for the RaspberryPi of smart garden project
It has the task to control the EV3 robot and take measurements with the mounted sensor
The sensor data is published to MQTT topics to be available for the backend server
Used protocol for interaction: mqtt (paho-mqtt module)
Interaction with the EV3 via SSH
 """

import paho.mqtt.client as mqtt
import functions
from defines import Topics, RASPI_CLIENT_ID, MQTT_BROKER_GLOBAL


def on_connect(client: mqtt.Client, userdata, flags, rc):
    """
    This method gets called, when it connects to a mqtt broker.
    It is used to subscribe to the specific topics

    Args:
        client (mqtt.Client): current mqtt client
        userdata (_type_): _description_
        flags (_type_): _description_
        rc (_type_): _description_
    """
    if rc == 0:
        #Add callbacks
        client.message_callback_add(Topics["ROBOT_ACTION_DRIVE"], functions.drive_plant)
        client.message_callback_add(Topics["ROBOT_ACTION_GETPOSITION"], functions.get_position)
        client.message_callback_add(Topics["ROBOT_ACTION_GETBATTERY"], functions.get_BatteryStatus)

        #Subscribe to topics
        client.subscribe(Topics["ROBOT_ACTION_DRIVE"])
        client.subscribe(Topics["ROBOT_ACTION_GETPOSITION"])
        client.subscribe(Topics["ROBOT_ACTION_GETBATTERY"])

        print("MQTT initialized")    
    


def main():
    """
    Initialises MQTT and Sensors
    Runs forever and controlls all robot functions
    """
    client = mqtt.Client(RASPI_CLIENT_ID)
    client.on_connect = on_connect
    client.connect(MQTT_BROKER_GLOBAL)

    # CHECK forever or start
    client.loop_start()

    print("Starting Loop")
    while True:
        pass


if __name__ == "__main__":
    main()