import time
from machine import Pin, SoftI2C, ADC
from dht import DHT22
import ujson
from ssd1306 import SSD1306_I2C
from Foto import LDR
import network
from umqtt.simple import MQTTClient

# MQTT Server Parameter
MQTT_CLIENT_ID = "FI21"
MQTT_BROKER    = "ec2-34-234-203-222.compute-1.amazonaws.com"
MQTT_USER      = "FI21"
MQTT_PASSWORD  = "FI21"
MQTT_TOPIC     = "Met/FI/Ruell"

# Connecting to WLAN
print("Verbinde mit WLAN", end="")
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('Wokwi-GUEST', '')
while not wlan.isconnected():
  print(".", end="")
  time.sleep(0.1)
print(" Verbunden!")

# Connecting to MQTT-Broker
print("Verbinde mit MQTT-Broker... ", end="")
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PASSWORD)
client.connect()
print("Verbunden!")

#analoge Werte
sensor = DHT22(Pin(15))
ldr = ADC(Pin(34))

# Variante 1: Konstante Kennwerte Fotowiderstand über Foto.py
Fotowiderstand = LDR()
gamma = Fotowiderstand.GAMMA
rl10 = Fotowiderstand.RL10

# Variante 2: Konstante Kennwerte Fotowiderstand
GAMMA = 0.7
RL10 = 50

#digitale Werte
button = Pin(4, Pin.IN)
led = Pin(2, Pin.OUT)
led_red = Pin(19, Pin.OUT)
led_yellow = Pin(18, Pin.OUT)
led_green = Pin(5, Pin.OUT)



# ESP32 Pin Zuweisung
i2c = SoftI2C(scl=Pin(22), sda=Pin(21))

oled_width = 128
oled_height = 64
oled = SSD1306_I2C(oled_width, oled_height, i2c)

#Nachkommastellen beschränken
def trim(num, n):
    integer = int(num * (10**n))/(10**n)
    return float(integer)

while True:
  
  
  sensor.measure() 
   
  temp = sensor.temperature()
  hum = sensor.humidity()

  #Berechnung Lux über analog.read(), Spannung und Widerstandswert
  av=ldr.read()/4
  v=av/1024*5
  r=2000 * v / (1 - v / 5)
  lux = pow(rl10 * 1e3 * pow(10, gamma) / r, (1 / gamma))
  
  
  oled.fill(0)
  oled.text('Temperatur: ' , 0, 10)
  oled.text('  %.1f C' %temp, 0, 20)
  oled.text('Luftfeuchtigkeit:' , 0, 30)
  oled.text('  %.1f %%'  %hum , 0, 40)
  
  oled.show()
  
  message = ujson.dumps({
    "Temperatur": sensor.temperature(),
    "Luftfeuchtigkeit": sensor.humidity(),
    "Helligkeit": trim(lux,1),
    "Bewegungsmelder": button.value()})
  
  #print (message)
  json_object = ujson.loads(message)
  #print("Temperatur:", json_object["Temperatur"], "°C")

  if button.value()==1:
    led.value(1)
  else:
    led.value(0)

    if temp >= 30:
      led_red.value(1)
      led_yellow.value(0)
      led_green.value(0)
    elif temp < 30 and temp >= 25:
      led_red.value(0)
      led_yellow.value(1)
      led_green.value(0)
    else:
      led_red.value(0)
      led_yellow.value(0)
      led_green.value(1)

  print("Übermittlung der Parameter an MQTT-Topic {}: {}".format(MQTT_TOPIC, message))
  client.publish(MQTT_TOPIC, message)
  time.sleep(1)