from smllib import SmlStreamReader
import time
import serial
from datetime import datetime

from influxdb_client import Point, WritePrecision
from influx import writeToDB

stream = SmlStreamReader()
port = serial.Serial(port='/dev/ttyUSB0', baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)

energyCounter = 0                           # Counter for values that should only be pushed to db every minute

while True:
    energyCounter += 1
    pushTime = datetime.utcnow()            # Get current datetime and safe it in pushTime variable
    pointList = []                          # Create list pointList where influxdb datapoint are stored before pushing to db
    sml_frame = stream.get_frame()          # Create the frame object from bytestream which is None until the frame is complete

    while sml_frame is None:
        stream.add(port.read())             # Add bytes until full frame is received
        try:
            sml_frame = stream.get_frame()  # Find frame from stream
        except Exception:
            print("CRCERROR")
            pass

    # A quick Shortcut to extract all values without parsing the whole frame
    # In rare cases this might raise an InvalidBufferPos exception, then you have to use sml_frame.parse_frame()
    obis_values = sml_frame.get_obis()

    # return all values but slower
    parsed_msgs = sml_frame.parse_frame()
    for msg in parsed_msgs:
        # prints a nice overview over the received values
        print(msg.format_msg())

    # In the parsed message the obis values are typically found like this
    obis_values = parsed_msgs[1].message_body.val_list

    # The obis attribute of the SmlListEntry carries different obis representations as attributes
    list_entry = obis_values[3]

    officePowerIn = int(obis_values[3].value*0.01)
    officeEnergyIn = int(obis_values[2].value*0.0001)

    print("Büro Wirkleistung aktuell: " + str(officePowerIn) + "W")
    print("Büro Energie bezug gesamt: " + str(officeEnergyIn) + "kWh")
    pointList.append( Point('power').field('officePowerIn', officePowerIn).time(pushTime, WritePrecision.S) )

    if energyCounter % 12 == 0:      # Only add energy to db every 6th while loop (every minute)
        pointList.append( Point('energy').field('officeEnergyIn', officeEnergyIn).time(pushTime, WritePrecision.S) )
        print("Energy in DB")
        energyCounter = 0

    for point in pointList:
        print(point)

    writeToDB(pointList)

    time.sleep(5)