#include <SoftwareSerial.h>

const int ledPin = 12;
//A0 - LDR pin
//A1 - potentiometer pin

//enumerator states is so we can give states a name
typedef enum states {
  On = 1;
  Off = 0;
  roomLight = 2;
}

//initiate state
int currentState = roomLight;

void setup() {
  //setup pin behaiviour
  pinMode(ledPin, OUTPUT);
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);

  //start a serial for debugging
  Serial.begin(9600);

  //roomLight state is somewhat the init state
  if(currentState == roomLight) {
    //proceed to the Off state which is expected at room light
    digitalWrite(ledPin, Off);
  }
}

void loop() {
  //read the analogInput
  int potValue = analogRead(A1);
  int ldrValue = analogRead(A0);

  //if reading shows its dark enough
  if(ldrValue <= potValue) {

    //if the current state is On
    //there is no need to add delay nor do anything
    //otherwise check again for the read was valid
    if(currentState != On) {

      //add a delay to reduce undesired interference
      delay(2000);

      //if the value still satisfies the condition for switching
      if(ldrValue <= potValue) {

        //turn it on
        digitalWrite(ledPin, On);

        //set the new state
        currentState = On;
      }
    }
  }
  //if we are passed the point of light where we turn off
  else if(ldrValue >= potValue + 200) {

    //if the current state is Off
    //there is no need to add delay nor do anything
    //otherwise check again for the read was valid
    if(currentState != Off) {

      //add a delay to reduce undesired interference
      delay(2000);

      //if the value still satisfies the condition for switching
      if(ldrValue >= potValue + 200) {

        //turn it off
        digitalWrite(ledPin, Off);

        //set the new state
        currentState = Off;
      }
    }
  }
}