// Program Deteksi Suhu dan Kelembapan, Scanning Wifi, dan Flip Flop LED
// Andini Putri - 10824013

// Library
#include <WiFi.h>
#include <ThingSpeak.h>
#include "DHT.h"

// Konfigurasi Sensor
#define DHTPIN 19
#define DHTTYPE DHT22

// PIN LED
int led1 = 25;
int led2 = 27;

// Konfigurasi WiFi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Konfigurasi Thingspeak
unsigned long channelID = 3325150;
const char* writeAPIKey = "5U267OR47PCHYY09";

WiFiClient client;
DHT dht(DHTPIN, DHTTYPE);

unsigned long lastTime = 0;
unsigned long interval = 20000;

bool ledState = false;

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

  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

  dht.begin();

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  Serial.print("Connecting to WiFi");

  unsigned long startAttemptTime = millis();

  while (WiFi.status() != WL_CONNECTED && millis() - startAttemptTime < 10000) {
    Serial.print(".");
    delay(500);
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWiFi Connected!");
    Serial.println(WiFi.localIP());
    ThingSpeak.begin(client);
  } else {
    Serial.println("\nWiFi FAILED!");
  }
}

void loop() {
  // ===== LED FLIP FLOP =====
  ledState = !ledState;
  digitalWrite(led1, ledState);
  digitalWrite(led2, !ledState);

  delay(500);

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Reconnecting WiFi...");
    WiFi.begin(ssid, password);
    return;
  }

  // ===== KIRIM DATA =====
  if (millis() - lastTime > interval) {
    lastTime = millis();

    float suhu = dht.readTemperature();
    float kelembapan = dht.readHumidity();

    if (isnan(suhu) || isnan(kelembapan)) {
      Serial.println("Failed to read DHT!");
      return;
    }

    Serial.print("Suhu: ");
    Serial.print(suhu);
    Serial.print(" | Kelembapan: ");
    Serial.println(kelembapan);

    ThingSpeak.setField(1, suhu);
    ThingSpeak.setField(2, kelembapan);

    int status = ThingSpeak.writeFields(channelID, writeAPIKey);

    if (status == 200) {
      Serial.println("Data sent to ThingSpeak ✅");
    } else {
      Serial.print("Send failed, code: ");
      Serial.println(status);
    }
  }
}