#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"
#include <LiquidCrystal_I2C.h>

const int DHT_PIN = 15;
const int LED_PIN = 13;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2792978;
const char* myApiKey = "XR54YH3Q8UMD51BR";
const char* server = "api.thingspeak.com";

DHTesp dhtSensor;
WiFiClient client;

LiquidCrystal_I2C lcd(0x27, 20, 4);

static float lastTemp = -999;
static float lastHumidity = -999;

void setup() {
  Serial.begin(115200);
  
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(LED_PIN, OUTPUT);
  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Connecting WiFi...");

  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Wifi not connected");
  }
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WiFi Connected!");
  delay(1000);
  lcd.clear();

  Serial.println("WiFi connected!");
  Serial.println("Local IP: " + WiFi.localIP().toString());
  WiFi.mode(WIFI_STA);

  ThingSpeak.begin(client);
}

void loop() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");

  if (data.temperature != lastTemp || data.humidity != lastHumidity) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: " + String(data.temperature, 1) + "\xDF" + "C");
    lcd.setCursor(0, 1);
    lcd.print("Humidity: " + String(data.humidity, 1) + "%");
    lcd.setCursor(0, 2);
    lcd.print("Wokwi Online IoT");

    lastTemp = data.temperature;
    lastHumidity = data.humidity;
  }

  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);
  int response = ThingSpeak.writeFields(myChannelNumber, myApiKey);

  if (data.temperature > 35 || data.temperature < 12 || data.humidity > 70 || data.humidity < 40) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  if (response == 200) {
    Serial.println("Data pushed successfully");
  } else {
    Serial.println("Push error: " + String(response));
  }

  Serial.println("---");

  delay(20000);
}