// HEADER FILES ---------------------------
#include <WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include "LiquidCrystal_I2C.h"
#include "DHT.h"
#include <ESP32Servo.h>
#include <RTClib.h>
RTC_DS1307 rtc;
// ----------------------------------------

// VARIABLE DEFINITIONS -------------------
#define relayPin 18
#define ldrPin 35
#define DHT_PIN 15
#define DHTTYPE DHT22
#define LED_PIN 33
DHT dht(DHT_PIN, DHT22);
LiquidCrystal_I2C lcd(0x27,20,4);
LiquidCrystal_I2C lcd2(0x27,20,4);

// Soil Moisture Sensor (FC-28) with Potentiometer
#include "FC28.h"
#define SensorFC28_Pin 34
float soil_moisture;
FC28Sensor mySensor;

const float gama = 0.7;
const float rl10 = 50;
// ----------------------------------------

// SETUP FUNCTION -------------------------
void setup() {
  Serial.begin(9600);
  Serial.flush();
  pinMode(ldrPin, INPUT);
  pinMode(DHT_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(relayPin, OUTPUT);
  mySensor.initFC28Sensor(115200, SensorFC28_Pin); 

  Wire.begin();
  if(!rtc.begin()){
    Serial.println("RTC Not Connected");
    lcd.setCursor(0,0);
    lcd.print("RTC Not Connected");
    while (1);
  }

  Serial.println("Smart Agriculture System");
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Welcome to");
  lcd.setCursor(0,1);
  lcd.print("Smart Agriculture");
  lcd.setCursor(0,2);
  lcd.print("Monitoring System");
  lcd.setCursor(0,3);
  lcd.print("UM SUMBAR");
  delay(2000);
  lcd.clear();
}
// ----------------------------------------

// MAIN LOOP ------------------------------
void loop() {
  // Get current date and time
  DateTime now = rtc.now();
  int year = now.year() % 100;
  Serial.println("Date               : " + String() + now.day() + "/" + now.month() + "/" + year);
  Serial.println("Time               : " + String() + now.hour() + ":" + now.minute() + ":" + now.second());

  // Read temperature and humidity from DHT22 sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  Serial.println("Temperature        : " + String(temperature, 2) + " °C");
  Serial.println("Humidity           : " + String(humidity, 1) + " %");

  // Read light level from LDR sensor
  int ldrValue = analogRead(ldrPin);
  ldrValue = map(ldrValue, 4095, 0, 1024, 0);
  float ldrVoltage = ldrValue / 1024.0 * 5;
  float ldrResistance = 2000 * ldrVoltage / (1 - ldrVoltage / 5);
  float lux = pow(rl10 * 1e3 * pow(10, gama) / ldrResistance, (1 / gama));
  Serial.println("Light Intensity    : " + String(lux, 3) + " Lux");
  String lightLevel = lux < 807 ? "Low" : lux > 808 && lux < 1614 ? "Medium" : "High";

  // Read soil moisture level
  soil_moisture = mySensor.getSoilMoisture();
  String soilCondition = soil_moisture < 33.33 ? "Wet" : soil_moisture > 66.66 ? "Dry" : "Normal";
  Serial.println("Soil Moisture      : " + String(soil_moisture, 2) + " %");

  // Water pump control using relay
  if (soil_moisture > 66.66) {
    digitalWrite(relayPin, HIGH);  // Activate water pump
  } else {
    digitalWrite(relayPin, LOW);   // Deactivate water pump
  }

  // LCD DISPLAY --------------------------
  // Soil condition
  lcd.setCursor(0, 0);
  lcd.print("Soil        :");
  lcd.setCursor(13, 0);
  lcd.print(soilCondition);

  // Light level
  if (lux < 807) {
    digitalWrite(LED_PIN, HIGH); // Turn on light indicator
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn off light indicator
  }
  lcd.setCursor(0, 1);
  lcd.print("Light       :");
  lcd.setCursor(13, 1);
  lcd.print(lightLevel);

  // Temperature display
  lcd.setCursor(0, 2);
  lcd.print("Temp        :");
  lcd.setCursor(13, 2);
  lcd.print(temperature);
  lcd.setCursor(19, 2);
  lcd.print("C");

  // Humidity display
  lcd.setCursor(0, 3);
  lcd.print("Humidity    :");
  lcd.setCursor(13, 3);
  lcd.print(humidity);
  lcd.setCursor(19, 3);
  lcd.print("%");

  Serial.println("------------------------");
  delay(2000);
  lcd.clear();
}
// ----------------------------------------