// Light Sensitivity Sensor Library
#include <BH1750.h>
// I2C Liquid Crystal Library
#include <LiquidCrystal_I2C.h>
// I2C Communication Library
#include <Wire.h>

// Required Declarations to use the libraries
LiquidCrystal_I2C lcd(0x27, 16, 2);
BH1750 lightMeter;

// Pin Configurations
const int redPin = 13;
const int yellowPin = 11;
const int greenPin = 12;

void setup() {
    pinMode(redPin, OUTPUT);
    pinMode(yellowPin, OUTPUT);
    pinMode(greenPin, OUTPUT);

    // Initialization for the libraries to start
    lcd.begin(16, 2);
    Wire.begin();

    lightMeter.begin();
    lightMeter.configure(BH1750::ONE_TIME_HIGH_RES_MODE);
    
    Serial.begin(9600);  // Initialize serial communication for debugging
}

void loop() {
    // Code for reading the measurements by the Light Sensitivity Sensor
    float lux = lightMeter.readLightLevel();

    // Print lux value to Serial Monitor for debugging
    Serial.print("Lux: ");
    Serial.println(lux);

    // Code for the LCD to display the measured values
    lcd.setCursor(0, 0);
    lcd.print("Light: ");
    lcd.print(lux);
    lcd.print(" lux ");
    lcd.setCursor(0, 1);
    lcd.print("Level: ");

    int high = 0;

    // Parameters to label according to the measurements by the Light Sensor.
    if (lux <= 50) {
        lcd.print("Dim ");
        high = yellowPin;
        digitalWrite(redPin, LOW);
        digitalWrite(greenPin, LOW);
    } else if (lux > 50 && lux <= 70) {
        lcd.print("Normal ");
        high = greenPin;
        digitalWrite(redPin, LOW);
        digitalWrite(yellowPin, LOW);
    } else if (lux > 70) {
        lcd.print("Too Much");
        high = redPin;
        digitalWrite(yellowPin, LOW);
        digitalWrite(greenPin, LOW);
    }

    // Debug print to Serial Monitor
    Serial.print("LED Pin: ");
    Serial.println(high);

    digitalWrite(high, HIGH);

    // A time for the LCD to update the measurements real-time (1 Second)
    delay(1000);
}