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

// ✅ WiFi credentials (Wokwi uses default simulation WiFi)
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// ✅ ThingSpeak Configuration
unsigned long channelID = 2906755;
const char* writeAPIKey = "TMRQUH0SA69EXLEA";

// ✅ DHT22 Sensor setup
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// ✅ LCD setup (I2C address 0x27, 16 columns, 2 rows)
LiquidCrystal_I2C lcd(0x27, 16, 2);

WiFiClient client;

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

  // ✅ LCD initialization fix
  lcd.init();            // ⚠️ Correct method instead of lcd.begin()
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Connecting WiFi");

  // ✅ WiFi connection
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WiFi Connected!");
  delay(1000);

  ThingSpeak.begin(client);  // ✅ Start ThingSpeak
  dht.begin();               // ✅ Start DHT Sensor
}

void loop() {
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  if (isnan(temp) || isnan(hum)) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    delay(2000);
    return;
  }

  // ✅ Display Temperature and Humidity on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T: ");
  lcd.print(temp);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("H: ");
  lcd.print(hum);
  lcd.print("%");

  // ✅ Send to ThingSpeak
  ThingSpeak.setField(1, temp);
  ThingSpeak.setField(2, hum);
  ThingSpeak.setField(3, temp > 27 ? 1 : 0);  // Temp Lamp
  ThingSpeak.setField(4, hum > 70 ? 1 : 0);   // Hum Lamp

  int code = ThingSpeak.writeFields(channelID, writeAPIKey);
  if (code == 200) {
    Serial.println("Data sent!");
  } else {
    Serial.print("Send error: ");
    Serial.println(code);
  }

  delay(15000); // ✅ ThingSpeak min delay
}