#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <DHT.h>

// ---- WiFi Wokwi (WAJIB) ----
const char* WIFI_SSID     = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";

// ---- Gunakan HTTP (bukan HTTPS) agar stabil di Wokwi ----
const char* SERVER_URL = "https://iot.goedu.my.id/udara/api/sensor.php";

// ---- Pin ----
#define MQ135_PIN   34
#define DHT_PIN     4
#define DHT_TYPE    DHT22

const unsigned long SEND_INTERVAL = 1000;

DHT dht(DHT_PIN, DHT_TYPE);

unsigned long lastSendTime = 0;

// ============================================
void setup() {
  Serial.begin(115200);
  delay(1000);

  Serial.println("GoIoT - Wokwi Mode");

  dht.begin();
  connectWiFi();
}

// ============================================
void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    connectWiFi();
  }

  if (millis() - lastSendTime > SEND_INTERVAL) {
    lastSendTime = millis();
    readAndSendData();
  }
}

// ============================================
void readAndSendData() {
  Serial.println("\n--- SENSOR ---");

  // Simulasi MQ135 (karena Wokwi tidak real gas sensor)
  int rawMQ135 = analogRead(MQ135_PIN);
  float mq135 = (rawMQ135 / 4095.0) * 100.0;

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

  if (isnan(suhu) || isnan(kelembaban)) {
    Serial.println("DHT ERROR!");
    return;
  }

  Serial.printf("MQ135: %.1f ppm\n", mq135);
  Serial.printf("Suhu: %.1f C\n", suhu);
  Serial.printf("Hum : %.1f %%\n", kelembaban);

  sendToServer(mq135, suhu, kelembaban);
}

// ============================================
void sendToServer(float mq135, float suhu, float kelembaban) {
  HTTPClient http;

  http.begin(SERVER_URL);
  http.addHeader("Content-Type", "application/json");

  StaticJsonDocument<200> doc;
  doc["mq135"] = mq135;
  doc["suhu"] = suhu;
  doc["kelembaban"] = kelembaban;

  String payload;
  serializeJson(doc, payload);

  Serial.println("POST: " + payload);

  int httpCode = http.POST(payload);

  if (httpCode > 0) {
    Serial.printf("HTTP Code: %d\n", httpCode);
    String response = http.getString();
    Serial.println(response);

  } else {
    Serial.println("HTTP ERROR");
  }

  http.end();
}

// ============================================
void connectWiFi() {
  Serial.print("Connecting WiFi");

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWiFi Connected!");
}