#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHTesp.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHTesp dht;
#define TRIG_PIN 5
#define ECHO_PIN 18
#define DHT_PIN 15
#define LDR_DO 23
#define GAS_AO 34
#define PIR_PIN 27

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

  // LCD setup
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print(" Smart Crop ");
  lcd.setCursor(0, 1);
  lcd.print(" Monitoring ");
  delay(2000);
  lcd.clear();

  // Sensor setup
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LDR_DO, INPUT);
  pinMode(GAS_AO, INPUT);
  pinMode(PIR_PIN, INPUT);

  dht.setup(DHT_PIN, DHTesp::DHT22); // use DHT11 if needed
}

float getDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2; // in cm
  return distance;
}

void loop() {
  // DHT sensor
  TempAndHumidity data = dht.getTempAndHumidity();
  float temp = data.temperature;
  float hum = data.humidity;

  // Ultrasonic
  float distance = getDistance();

  // LDR (Digital)
  int light = digitalRead(LDR_DO);

  // Gas (Analog)
  int gasValue = analogRead(GAS_AO);

  // PIR
  int motion = digitalRead(PIR_PIN);

  // Print to Serial Monitor
  Serial.print("Temp: "); Serial.print(temp); Serial.print("°C  ");
  Serial.print("Hum: "); Serial.print(hum); Serial.print("%  ");
  Serial.print("Dist: "); Serial.print(distance); Serial.print("cm  ");
  Serial.print("Light: "); Serial.print(light); Serial.print("  ");
  Serial.print("Gas: "); Serial.print(gasValue); Serial.print("  ");
  Serial.print("PIR: "); Serial.println(motion);

  // Show on LCD (2 pages)
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T:"); lcd.print(temp, 1);
  lcd.print((char)223); lcd.print("C ");
  lcd.print("H:"); lcd.print(hum, 0); lcd.print("%");

  lcd.setCursor(0, 1);
  lcd.print("D:"); lcd.print(distance, 0); lcd.print("cm ");
  lcd.print(light ? "Light" : "Dark");

  delay(2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Gas:"); lcd.print(gasValue);

  lcd.setCursor(0, 1);
  lcd.print("Motion:");
  lcd.print(motion ? "YES" : "NO ");

  delay(2000);
}