#define BLYNK_TEMPLATE_ID "TMPL3iJfsm3Im"
#define BLYNK_TEMPLATE_NAME "Agro Smart Irrigation"
#define BLYNK_AUTH_TOKEN "EzMPFfTXFAWJ8GapCRkx7jPJzPq1_jPd"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

// -------- WiFi --------
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// -------- LCD --------
LiquidCrystal_I2C lcd(0x27, 16, 2);

// -------- DHT --------
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// -------- PINS --------
#define SOIL_PIN 34
#define RELAY_PIN 5

// -------- THRESHOLD --------
int soilThreshold = 2000;

void setup() {
  Serial.begin(115200);

  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);  // Pump OFF initially

  dht.begin();

  // LCD Setup
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Connecting WiFi");
  
  // Blynk Connection
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  lcd.clear();
  lcd.print("Connected!");
  delay(1000);
  lcd.clear();
}

void loop() {
  Blynk.run();

  // -------- SENSOR READINGS --------
  int soilValue = analogRead(SOIL_PIN);
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // -------- DECISION LOGIC --------
  bool pumpState;

  if (soilValue > soilThreshold) {
    digitalWrite(RELAY_PIN, HIGH);   // Pump ON
    pumpState = 1;
  } else {
    digitalWrite(RELAY_PIN, LOW);    // Pump OFF
    pumpState = 0;
  }

  // -------- SEND TO BLYNK --------
  Blynk.virtualWrite(V0, soilValue);
  Blynk.virtualWrite(V1, temperature);
  Blynk.virtualWrite(V2, humidity);
  Blynk.virtualWrite(V3, pumpState);

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

  lcd.setCursor(0, 1);
  lcd.print(pumpState ? "PUMP: ON " : "PUMP: OFF");

  delay(2000);
}