#define BLYNK_TEMPLATE_ID "TMPL6ANBnCYwI"
#define BLYNK_TEMPLATE_NAME "SMOKE DETECTOR"
#define BLYNK_AUTH_TOKEN "NlgE8WqmDW8m-4qNRxGWPRTuPkeUWGjo"
#define BLYNK_PRINT Serial
#define BLYNK_DEBUG

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Wire.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;
const int smokeA0 = 18;
int sensorThres = 100;
int data;

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_SDA 21
#define OLED_SCL 22
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

const int buzzerPin = 2;

void displayCenteredText(const String &text, int size) {
  int16_t x1;
  int16_t y1;
  uint16_t width;
  uint16_t height;

  display.setTextSize(size);
  display.getTextBounds(text, 0, 0, &x1, &y1, &width, &height);

  display.setCursor((SCREEN_WIDTH - width) / 2, (SCREEN_HEIGHT - height) / 2);
  display.println(text);
}

void sendSensor() {
  data = analogRead(smokeA0);

  Blynk.virtualWrite(V0, data);

  display.clearDisplay();
  display.setTextColor(WHITE);

  if (data > sensorThres) {
    Blynk.logEvent("gas_detected", "GAS DETECTED");
    display.setCursor(0, 40);
    displayCenteredText("ASAP TERDETEKSI", 1);
    display.display();
    tone(buzzerPin, 3000);
  } else {
    display.setCursor(0, 40);
    displayCenteredText("KUALITAS UDARA", 1);
    display.setCursor(0, 20);
    displayCenteredText("NORMAL", 1);
    display.display();
    noTone(buzzerPin);
  }
}

void setup() {
  Serial.begin(115200);
  
  WiFi.begin(ssid, pass);
  Serial.print("Connecting to WiFi");
  int attempt = 0;
  while (WiFi.status() != WL_CONNECTED && attempt < 20) {
    delay(500);
    Serial.print(".");
    attempt++;
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nConnected to the WiFi network");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
  } else {
    Serial.println("\nFailed to connect to WiFi. Status: " + String(WiFi.status()));
  }

  Blynk.config(BLYNK_AUTH_TOKEN);
  bool result = Blynk.connect();
  Serial.println(result ? "Blynk Connected" : "Blynk Not Connected");

  pinMode(smokeA0, INPUT);
  pinMode(buzzerPin, OUTPUT);
  timer.setInterval(2500L, sendSensor);

  Wire.begin(OLED_SDA, OLED_SCL);
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.println("Initializing...");
  display.display();
}

void loop() {
  Blynk.run();
  timer.run();
}