#include <Servo.h>                            //includes the servo library
 
 /*create servo object*/
 Servo myServo;                                //creates the servo object
 
 /*define pins for the componente*/
  const int bluLedPin = 5;                        //RED LED TO PIN 5
  const int grnLedPin = 6;                        //BLUE LED TO PIN 6
 const int offSlideSwitchPin = 4;                //off is pin 4
  const int onSlideSwitchPin = 2;                 //on is pin 2
  const int buzzerPin = 12;                       //buzzer pin 12
  const int LDRpin = A0;

/*define variables*/
int pos;                                           //starting position of the servo
int bluLedState;                                   //variable for the state of blu led
int grnLedState;                                  //variable for the state of grn led
int slideSwitchState;
int onSlideSwitchState;
int offSlideSwitchState;
int Lux = 0;                                    //variable to store Lux value
int luxThreshold = 7;                           //threshold for the lux value
unsigned long currentMillis = 0;                //variable to store current time
unsigned long previousMillis = 0;                   //variable to store previous time
unsigned long elapsedTime = 0;                      //variable to store elapsed time
const unsigned long period = 1000;                  //variable to store the period to check periods of time

void setup(){
 
  Serial.begin(9600);                                         //begin the serial monitor
  pinMode(bluLedPin, OUTPUT);                               //SETS PIN 5 AS OUTPUT
  pinMode(grnLedPin, OUTPUT);                              //SETS PIN 6 AS AN OUTPUT
  pinMode(onSlideSwitchPin, INPUT);                       //SETS PIN 2 AS AN INPUT
  pinMode(offSlideSwitchPin, INPUT);                    //SETS PIN 4 AS AN INPUT
  pinMode(LDRpin, INPUT);                              //SETS PIN a0 AS AN INPUT
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW);
  digitalWrite(bluLedPin, LOW);                                 //TURNS blue LED off
  digitalWrite(grnLedPin, HIGH);                              //TURNS green led ON
  digitalWrite(offSlideSwitchPin, HIGH);                    //off switch is on or high (system is off)
  digitalWrite(onSlideSwitchPin, LOW);                    //on switch is off or low (system is off) 
}

 
void loop(){

millis();

bluLedState = digitalRead(bluLedPin);                           //reads the current state of the blue led ie on or off
grnLedState = digitalRead(grnLedPin);                               //reads the current state of the redled ie on or off
onSlideSwitchState = digitalRead(onSlideSwitchPin);                     //reads the current state of the on switch ie on or off
offSlideSwitchState = digitalRead(offSlideSwitchPin);                       //reads the current state of the off switch ie on or off

currentMillis = millis();

/*turns on or off the led depending on switch position on/off*/
  if (onSlideSwitchState == HIGH) {digitalWrite(grnLedPin, HIGH);}
  else {digitalWrite(grnLedPin, LOW);}
  if (offSlideSwitchState == HIGH) {digitalWrite(bluLedPin, HIGH);}
  else {digitalWrite(bluLedPin, LOW);}
     currentMillis = previousMillis;
  if (currentMillis - previousMillis <= period) {digitalRead(onSlideSwitchPin);}
  if (onSlideSwitchState == LOW) {digitalWrite(bluLedPin, HIGH);} 
  else {digitalWrite(bluLedPin, LOW);}
/*end "turns on or off" the led depending on switch position on/off*/

if (currentMillis - previousMillis <= period){analogRead(LDRpin);
Lux = analogRead(LDRpin);
Serial.println(Lux);
digitalRead(grnLedPin);
if ((Lux << luxThreshold) && (grnLedPin == HIGH)){blinkGrnLed()}
else {digitalWrite(bluLedPin, HIGH);
delay(500);
digitalWrite(bluLedPin, LOW);
delay(500);}

if (Lux >> luxThreshold) {digitalWrite(bluLedPin, HIGH);
delay(500);
digitalWrite(bluLedPin, LOW);
delay(500);}
/*else {digitalWrite(grnLedPin,HIGH);
delay(500);
digitalWrite(grnLedPin, LOW);
delay(500);}*/

}
}

void blinkGrnLed(){
  digitalWrite(grnLed, HIGH);
  delay(500);
  digitalWrite(grnLed, LOW);
  delay(500);
}


/*
if ((Lux <= luxThreshold) && (grnLedState == HIGH)) {
  digitalWrite(buzzerPin, LOW);} 
if ((Lux <= luxThreshold) && (grnLedState == HIGH)) {
  digitalWrite(buzzerPin, HIGH);
}*/


/*currentMillis = millis(); 
elapsedTime = currentMillis - previousMillis;
//if (elapsedTime < 30000) {digitalWrite(buzzerPin, HIGH);}
//else {digitalWrite(buzzerPin, LOW);}
previousMillis = currentMillis;
}*/






  /*{for (pos = 90; pos <= 180; pos += 1) { // goes from 0 degrees to 90 degrees in steps of 1 degree
    
    myServo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);}                    // waits 15ms for the servo to reach the position

 
  for (pos = 180; pos >= 90; pos -= 1) { // goes from 90 degrees to 0 degrees
    
    myServo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);}                    // waits 15ms for the servo to reach the position


  for (pos = 0; pos == 0; pos == 0){
    
    myServo.write(90);
    delay(15);
  
    }*/