import paho.mqtt.client as mqtt
import json
import threading
import os
import raspy_sensors as Sensors
from defines import Topics, SENSORDATA

def measure_send_data(plantID, actionID, client: mqtt.Client):
    """
    Reads all sensors and publishes data via MQTT in form of SENSORDATA

    Args:
        plantID (_type_): plant to measure
        actionID (_type_): current ID of driving action
        client (mqtt.Client): current mqtt client for publishing
    """
    sensorData = SENSORDATA

    try:
        sensorData = Sensors.readSensors()
    except Exception as e:
        print(str(e))
        # TODO Error message MQTT

    sensorData["PlantID"] = plantID
    sensorData["ActionID"] = actionID
    client.publish(Topics["ROBOT_DATA_SENSORDATA"], json.dumps(sensorData, indent=4))


def drive_plant_thread(plantID, actionID, client: mqtt.Client):
    """
    Function to drive to plant according to number from MQTT message in thread
    Meassure and publish data via MQTT
    Drive home to starting point

    Args:
        plantID (_type_): plant to measure
        actionID (_type_): current ID of driving action 
        client (mqtt.Client): current mqtt client for publishing
    """
    # FIXME Change to color code driving
    errorCode = os.system(f'sshpass -p maker ssh robot@ev3dev.local python3 /home/robot/Programme/plant_{plantID}.py')
    # errorCode = os.system(f'sshpass -p maker ssh robot@ev3dev.local python3 /home/robot/Programme/drive_plant.py {plantID}')

    # TODO Error Message
    if errorCode != 0:
        print(f"Robot Error {errorCode} occurred")
        print("Drive Plant aborted, Robot at starting position")
        return
   
    print("Measuring Sensors")
    measure_send_data(plantID, actionID, client)

    print("Robot driving home")
    errorCode = os.system(f'sshpass -p maker ssh robot@ev3dev.local python3 /home/robot/Programme/drive_back.py {plantID}')

    # TODO Error Message
    if errorCode != 0:
        print(f"Robot Error {errorCode} occurred")
        print(f"Drive Home aborted, Robot at plant {plantID}")
        return

    print("Robot home")

    #TODO decide about robot occupied message
    #client.publish("ROBOT/DATA/OCCUPIED", "false")


#region MQTT callbacks

def drive_plant(clients: mqtt.Client, userdata, message: mqtt.MQTTMessage):
    """
    Function to drive to plant according to request
    Starting Drive in Thread to not block main programm

    Args:
        clients (mqtt.Client): current mqtt client
        userdata (_type_): _description_
        message (mqtt.MQTTMessage): received DRIVE message with PlantID and ActionID
    """
    dictMessage = json.loads(str(message.payload.decode("UTF-8")))
    plantID = dictMessage["PlantID"]
    actionID = dictMessage["ActionID"]

    print(f"Received Drive-request to plant {plantID}, ActionID: {actionID}")
    
    thread = threading.Thread(target= drive_plant_thread, args=(plantID, actionID, clients), daemon=True)
    thread.start()


def get_position(clients: mqtt.Client, userdata, message: mqtt.MQTTMessage):
    """
    Callback function for GPS position request
    Function to send actual GPS position via MQTT in form of POSITION

    Args:
        clients (mqtt.Client): current mqtt client
        userdata (_type_): _description_
        message (mqtt.MQTTMessage): received message
    """
    # TODO Write GPS Sensor Function
    position = {
        "Position": ""
    }

    clients.publish(Topics["ROBOT_DATA_POSITION"], json.dumps(position, indent=4))


def get_BatteryStatus(clients: mqtt.Client, userdata, message: mqtt.MQTTMessage):
    """
    Callback function for battery status request
    Function to read battery status from ev3 and send via MQTT in form of BATTERY
    8,5V -> 100%
    5V -> 0%

    Args:
        clients (mqtt.Client): current mqtt client
        userdata (_type_): _description_
        message (mqtt.MQTTMessage): received message
    """
    print("Received battery status request")

    try:
        batteryLevel = int(os.popen('sshpass -p maker ssh robot@ev3dev.local cat /sys/devices/platform/battery/power_supply/lego-ev3-battery/voltage_now').read())
    except:
        print("Robot not connected")
        #TODO Error Message
        return

    batteryLevel = round(batteryLevel / 1000000, 2)       # Voltage
    batteryLevel = batteryLevel - 5
    batteryLevel = round(batteryLevel / 3.5, 3) *100      # Percentage

    battery = {
        "Battery": batteryLevel
    }
    clients.publish(Topics["ROBOT_DATA_BATTERY"], json.dumps(battery, indent=4))

#endregion