/********** BLYNK CONFIG **********/
#define BLYNK_TEMPLATE_ID "TMPL6hWTUmree"
#define BLYNK_TEMPLATE_NAME "LatihanDHT22"
#define BLYNK_AUTH_TOKEN "VDeHdzvOSMsFSZOgMCZbTUTYU_Bp0mBo"

/********** LIBRARY **********/
#include <WiFi.h>
#include <HTTPClient.h>
#include <BlynkSimpleEsp32.h>
#include "DHTesp.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

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

/********** THINGSPEAK **********/
String writeApiKey = "URA7V4AHSRGCFQ9H";
String serverUrl   = "https://api.thingspeak.com/update";

/********** PIN **********/
#define DHT_PIN 15
#define LED_BLYNK 2
#define LED_TS 4

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

/********** TIMER **********/
unsigned long lastBlynk = 0;
unsigned long lastTS    = 0;

const unsigned long INTERVAL_BLYNK = 2000;
const unsigned long INTERVAL_TS    = 15000;

/********** STATUS **********/
String wifiStatus  = "DISCONNECTED";
String blynkStatus = "IDLE";
String tsStatus    = "IDLE";

/********** OBJEK **********/
DHTesp dht;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

/********** OLED **********/
void tampilOLED(float t, float h) {
  display.clearDisplay();
  display.setCursor(0, 0);

  display.print("T:");
  display.print(t, 1);
  display.print("C H:");
  display.print(h, 1);
  display.println("%");

  display.print("WiFi: ");
  display.println(wifiStatus);

  display.print("Blynk: ");
  display.println(blynkStatus);

  display.print("TS: ");
  display.println(tsStatus);

  display.display();
}

/********** SETUP **********/
void setup() {
  Serial.begin(115200);

  pinMode(LED_BLYNK, OUTPUT);
  pinMode(LED_TS, OUTPUT);

  dht.setup(DHT_PIN, DHTesp::DHT22);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.setTextSize(1);
  display.setTextColor(WHITE);

  Serial.println("=== SYSTEM BOOT ===");

  WiFi.begin(ssid, password);
  Serial.print("Connecting WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(200);
    Serial.print(".");
  }
  wifiStatus = "CONNECTED";
  Serial.println("\nWiFi CONNECTED");

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);
  Serial.println("Blynk Initialized");
}

/********** LOOP **********/
void loop() {
  Blynk.run();

  unsigned long now = millis();
  TempAndHumidity data = dht.getTempAndHumidity();

  // ===== SENSOR VALIDATION =====
  if (isnan(data.temperature) || isnan(data.humidity)) {
    blynkStatus = "SENSOR ERR";
    tsStatus    = "SENSOR ERR";

    Serial.println("[ERROR] DHT22 read failed");
    tampilOLED(0, 0);
    return;
  }

  // ===== UPDATE WIFI STATUS =====
  wifiStatus = (WiFi.status() == WL_CONNECTED) ? "CONNECTED" : "DISCONNECTED";

  // ===== BLYNK (2 DETIK) =====
  if (now - lastBlynk >= INTERVAL_BLYNK) {
    lastBlynk = now;

    Serial.println("---- BLYNK UPDATE ----");
    Serial.printf("Temp: %.2f C | Hum: %.2f %%\n",
                  data.temperature, data.humidity);

    if (Blynk.connected()) {
      Blynk.virtualWrite(V0, data.temperature);
      Blynk.virtualWrite(V1, data.humidity);
      blynkStatus = "SUCCESS";

      Serial.println("Blynk Send: SUCCESS");
      digitalWrite(LED_BLYNK, HIGH);
    } else {
      blynkStatus = "FAILED";
      Serial.println("Blynk Send: FAILED (Not Connected)");
      digitalWrite(LED_BLYNK, LOW);
    }
  }

  // ===== THINGSPEAK (15 DETIK) =====
  if (now - lastTS >= INTERVAL_TS) {
    lastTS = now;

    Serial.println("---- THINGSPEAK UPDATE ----");

    String url = serverUrl +
      "?api_key=" + writeApiKey +
      "&field1=" + String(data.temperature, 2) +
      "&field2=" + String(data.humidity, 2);

    HTTPClient http;
    http.begin(url);
    int code = http.GET();
    String payload = http.getString();
    http.end();

    Serial.print("HTTP Code: ");
    Serial.println(code);
    Serial.print("Response : ");
    Serial.println(payload);

    if (code > 0 && payload.toInt() > 0) {
      tsStatus = "SUCCESS";
      Serial.println("ThingSpeak Send: SUCCESS");
      digitalWrite(LED_TS, HIGH);
    } else {
      tsStatus = "FAILED";
      Serial.println("ThingSpeak Send: FAILED");
      digitalWrite(LED_TS, LOW);
    }
  }

  // ===== OLED UPDATE =====
  tampilOLED(data.temperature, data.humidity);

  // ===== AUTO OFF LED =====
  if (now - lastBlynk > 300) digitalWrite(LED_BLYNK, LOW);
  if (now - lastTS > 300) digitalWrite(LED_TS, LOW);
}