#define BLYNK_TEMPLATE_NAME "FYP1"
#define BLYNK_TEMPLATE_ID "TMPL6yV9DUzxP"
#define BLYNK_AUTH_TOKEN "VEt8zkTcKa_XkA5JC_1GA2p6--h5aNg3"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <WiFiClient.h>
#include "DHT.h"  // Correct DHT library header
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SPI.h>


#define SCREEN_WIDTH        128 // OLED display width, in pixels
#define SCREEN_HEIGHT        64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET            -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3d ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Blynk auth token and Wi-Fi credentials
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// DHT22 setup
#define DHTPIN 18       // GPIO pin connected to DHT22 Data pin
#define DHTTYPE DHT22   // Sensor type
DHT dht(DHTPIN, DHTTYPE);

// Pin definitions
#define PHOTORESISTOR_PIN 35    // Photoresistor sensor pin
#define POTENTIOMETER_PIN 32   // Potentiometer pin

// Variable
float potVoltage;
float photoVoltage;
float temperature;
float humidity;

// Timers
BlynkTimer timer;

void sendSensorData(){

  potVoltage = 40;
  photoVoltage = 34;
  temperature = -42.4;
  humidity = 50;
  Blynk.virtualWrite(V0, potVoltage);
  Blynk.virtualWrite(V1, photoVoltage);
  Blynk.virtualWrite(V2, temperature);
  Blynk.virtualWrite(V3, humidity);
}

// Function to read data and send to Blynk
void potentiodata_blynk() {
  // Potentiometer Value
  int potValue = analogRead(POTENTIOMETER_PIN);
  potVoltage = potValue * (3.3 / 4095.0);  // ESP32 ADC to Voltage
  Blynk.virtualWrite(V0, potVoltage);
  Serial.print("Potentiometer:");
  Serial.print(potVoltage);
  Serial.println(" Ohm");
}

void potentiodata() {
  // Potentiometer Value
  int potValue = analogRead(POTENTIOMETER_PIN);
  potVoltage = potValue * (3.3 / 4095.0);  // ESP32 ADC to Voltage
  Serial.print("Potentiometer:");
  Serial.print(potVoltage);
  Serial.println(" Ohm");
}




void photodata_blynk(){
  // Photoresistor Sensor Value (Digital)
  int photoValue = analogRead(PHOTORESISTOR_PIN);
  photoVoltage = photoValue * (3.3 / 4095.0);  // Convert to Voltage
  Blynk.virtualWrite(V1, photoVoltage);
  Serial.print("Photoresistor:");
  Serial.print(photoVoltage);
  Serial.println(" V");
}

void photodata(){
  // Photoresistor Sensor Value (Digital)
  int photoValue = analogRead(PHOTORESISTOR_PIN);
  photoVoltage = photoValue * (3.3 / 4095.0);  // Convert to Voltage
  Serial.print("Photoresistor:");
  Serial.print(photoVoltage);
  Serial.println(" V");
}

void temperaturedata_blynk(){
  // DHT22 Temperature and Humidity
   temperature = dht.readTemperature();
  
  if (!isnan(temperature)) {
    Blynk.virtualWrite(V2, temperature);
    Serial.print("Temperature:");
    Serial.print(temperature);
    Serial.println(" °C");
  } else {
    Serial.println("DHT22 Sensor error!");
  }
}

void temperaturedata(){
  // DHT22 Temperature and Humidity
   temperature = dht.readTemperature();
  
  if (!isnan(temperature)) {
    Serial.print("Temperature:");
    Serial.print(temperature);
    Serial.println(" °C");
  } else {
    Serial.println("DHT22 Sensor error!");
  }
}

void humiditydata_blynk(){
  // DHT22 Temperature and Humidity
   humidity = dht.readHumidity();
  

  if ( !isnan(humidity)) {
    Blynk.virtualWrite(V3, humidity);
    Serial.print("Humidity:");
    Serial.print(humidity);
    Serial.println(" %");
  } else {
    Serial.println("DHT22 Sensor error!");
  }
}

void humiditydata(){
  // DHT22 Temperature and Humidity
   humidity = dht.readHumidity();

  if (!isnan(humidity)) {
    Serial.print("Humidity:");
    Serial.print(humidity);
    Serial.println(" %");
  } else {
    Serial.println("DHT22 Sensor error!");
  }
}

void displaytext() {
  display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);
  display.print("Pot:");
  display.print(potVoltage);
  display.println(" Ohm");

  display.setCursor(0, 10);
  display.print("Photo:");
  display.print(photoVoltage);
  display.println(" V");

  display.setCursor(0, 20);
  display.print("Temp:");
  display.print(temperature);
  display.println(" °C");

  display.setCursor(0, 30);
  display.print("Hum:");
  display.print(humidity);
  display.println(" %");

  display.display();      // Show initial text
  delay(100);
}

void setup() {

  potVoltage = 0;
  photoVoltage = 0;
  temperature = 0;
  humidity = 0;

  Serial.println("Hello, ESP32!");
  // Serial Monitor
  Serial.begin(115200);

  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  display.display();
  delay(2000); // Pause for 2 seconds
  // Clear the buffer
  display.clearDisplay();
  display.display();
  

  // Initialize Blynk
  Blynk.begin(auth, ssid, pass);

  // Initialize DHT22
  dht.begin();

  // Flame Sensor as INPUT
  pinMode(PHOTORESISTOR_PIN, INPUT);
  
  // Potentiometer Sensor
  pinMode(POTENTIOMETER_PIN, INPUT);

  // Timer to send data every 2 seconds
  timer.setInterval(2000L, sendSensorData);
}

void loop() {

  potentiodata();
  photodata();
  temperaturedata();
  humiditydata();
  displaytext();

  Blynk.run();
  timer.run();

  delay(1000);
  
}