#include <Servo.h>

typedef Servo Screen;

// rgb led pins
const int RED_PIN = 11,
          GREEN_PIN = 10,
          BLUE_PIN = 9;

// servo objects pins
const int SERVO1_PIN = 3,
          SERVO2_PIN = 5,
          SERVO3_PIN = 6;

// servo angles
const int OPEN_ANGLE = 90,
          CLOSE_ANGLE = 0;

// ldr
const int LDR_PIN = A0,
          MAX_LDR_VALUE = 1015, // wokwi value
          MIN_LDR_VALUE = 8;    // wokwi value

int previousLuminosityPercent = -1, luminosityPercent;

// to the delay function...
const int ONE_SECOND = 1000;

// the servomotors objects
Screen screens[3];

// to moveScreens function
int screensToClose = 0;

// functions...
void rgb(bool r, bool g, bool b);
void turnRed();
void turnYellow();
void turnGreen();

void openScreen(Screen screen);
void closeScreen(Screen screen);

int getLuminosityPercent();
int moveScreens();

void setup() {
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  rgb(0, 0, 0);

  pinMode(LDR_PIN, INPUT);

  screens[0].attach(SERVO1_PIN);
  screens[0].write(0);

  screens[1].attach(SERVO2_PIN);
  screens[1].write(0);

  screens[2].attach(SERVO3_PIN);
  screens[2].write(0);

  Serial.begin(9600);
}

void loop() {
  luminosityPercent = getLuminosityPercent();
  
  if (luminosityPercent != previousLuminosityPercent)
  {
    if (luminosityPercent >= 80)
    {
      turnRed();
      screensToClose = 3;
    } 
    else if (luminosityPercent >= 50) 
    {
      turnYellow();
      screensToClose = 2;
    }
    else
    {
      turnGreen();
      screensToClose = 1;
    }

    moveScreens(screensToClose);

    Serial.print("LDR %: ");
    Serial.println(luminosityPercent);

    previousLuminosityPercent = luminosityPercent;
  } 
}

void rgb(bool r, bool g, bool b)
{
  digitalWrite(RED_PIN, r);
  digitalWrite(GREEN_PIN, g);
  digitalWrite(BLUE_PIN, b);
}

void turnRed()
{
  rgb(1, 0, 0);
}

void turnYellow() 
{
  rgb(1, 1, 0);
}

void turnGreen() 
{
  rgb(0, 1, 0);
}


void openScreen(Screen screen)
{
  screen.write(OPEN_ANGLE);
}

void closeScreen(Screen screen)
{
  screen.write(CLOSE_ANGLE);
}

int getLuminosityPercent()
{
  int ldrValue = analogRead(LDR_PIN);
  return map(ldrValue, MIN_LDR_VALUE, MAX_LDR_VALUE, 100, 0);
}

int moveScreens(int quantityOfScreensToClose)
{
  quantityOfScreensToClose--;
  for (int i=0; i<3; i++)
  {
    if (i <= quantityOfScreensToClose)
      closeScreen(screens[i]);
    else
      openScreen(screens[i]);
  }
}