#include <WiFi.h>
#include <HTTPClient.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Wire.h>
#include <DHT.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <BlynkSimpleEsp32.h>

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

// ThingSpeak API
const char* server = "http://api.thingspeak.com/update";
const char* apiKey = "US8YIK9EJHNPJ3SJ";

// Blynk Configuration
#define BLYNK_TEMPLATE_ID "TMPL64eD8sCRg"
#define BLYNK_TEMPLATE_NAME "IoT Health Monitor"
#define BLYNK_AUTH_TOKEN "BqD7kMPponimCnP-0s3gsaZcsHlSZM75"
char auth[] = BLYNK_AUTH_TOKEN;

// DHT Configuration
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Potentiometer Configuration
#define Sensor_Jantung 34

// DS18B20 Configuration
#define Sensor_suhu_tubuh 18
OneWire oneWire(Sensor_suhu_tubuh);
DallasTemperature ds18b20(&oneWire);

// OLED Configuration
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);

  // Initialize DHT
  dht.begin();

  // Initialize DS18B20
  ds18b20.begin();

  // Initialize OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("OLED initialization failed!");
    while (true);
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  // Connect to Wi-Fi
  display.setCursor(0, 0);
  display.println("Connecting to Wi-Fi...");
  display.display();
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    display.print(".");
    display.display();
  }
  display.println("\nConnected!");
  display.display();

  // Connect to Blynk
  Blynk.begin(auth, ssid, password);
}

void loop() {
  Blynk.run();

  // Read Sensor Data
  float temperatureDHT = dht.readTemperature();
  float humidity = dht.readHumidity();
  int rawValue = analogRead(Sensor_Jantung);
  int heartRate = map(rawValue, 0, 4095, 0, 200);
  
  ds18b20.requestTemperatures();
  float temperatureDS = ds18b20.getTempCByIndex(0);

  if (isnan(temperatureDHT) || isnan(humidity) || temperatureDS == DEVICE_DISCONNECTED_C) {
    Serial.println("Failed to read from one or more sensors!");
    return;
  }

  // Display Data on OLED
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("IoT Health Monitor");
  display.print("DHT Temp: "); display.print(temperatureDHT); display.println(" C");
  display.print("DS18B20 Temp: "); display.print(temperatureDS); display.println(" C");
  display.print("Kelembapan: "); display.print(humidity); display.println(" %");
  display.print("Heart Rate: "); display.print(heartRate); display.println(" bpm");
  display.display();

  // Send Data to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = String(server) + "?api_key=" + apiKey +
                 "&field1=" + String(temperatureDHT) +
                 "&field2=" + String(temperatureDS) +
                 "&field3=" + String(humidity) +
                 "&field4=" + String(heartRate);
    http.begin(url);
    int httpResponseCode = http.GET();
    http.end();

    if (httpResponseCode == 200) {
      Serial.println("Data berhasil dikirim ke ThingSpeak");
    } else {
      Serial.print("Gagal mengirim data ke ThingSpeak. HTTP Response Code: ");
      Serial.println(httpResponseCode);
    }
  } else {
    Serial.println("WiFi Disconnected");
  }

  // Send Data to Blynk
  Blynk.virtualWrite(V0, temperatureDHT);
  Blynk.virtualWrite(V1, temperatureDS);
  Blynk.virtualWrite(V2, humidity);
  Blynk.virtualWrite(V3, heartRate);

  delay(10000); // Delay 10 detik
}