#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL3WT83LmfX"
#define BLYNK_TEMPLATE_NAME "HEALTHCAREIOT"
#define BLYNK_AUTH_TOKEN "l4k-iF5CS6z6YtgrcqPSxMS8PGcZazGi"

#include <LiquidCrystal_I2C.h>
#include <WiFi.h>              
#include <WiFiClient.h>        
#include <BlynkSimpleEsp32.h>  
#include <Wire.h>              

// Initialize LCD with I2C address 0x27
LiquidCrystal_I2C lcd(0x27, 16, 2);

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

// Sensor Pins mapped to your Wokwi diagram potentiometers
const int PIN_BPM = 2;
const int PIN_SPO2 = 3;
const int PIN_TEMP = 4;

int currentBPM = 0;
int currentSpo2 = 0;
float currentTemp = 0.0;

// Correctly declare the timer object
BlynkTimer timer; 

void sendSensorData() {
  // 1. Read the potentiometers
  int rawBPM = analogRead(PIN_BPM);
  int rawSpo2 = analogRead(PIN_SPO2);
  int rawTemp = analogRead(PIN_TEMP);
  
  // 2. Manipulate/Map the raw data into realistic health numbers
  currentBPM = map(rawBPM, 0, 4095, 60, 140);             // BPM ranges from 60 to 140
  currentSpo2 = map(rawSpo2, 0, 4095, 90, 100);           // SpO2 ranges from 90% to 100%
  currentTemp = 35.0 + (float(rawTemp) / 4095.0) * 6.0;   // Temp ranges from 35.0C to 41.0C

  // 3. Display text and variables on the LCD
  lcd.clear();
  
  // First row: "BPM: 75  SpO2: 98"
  lcd.setCursor(0,0);
  lcd.print("BPM:"); 
  lcd.print(currentBPM);
  lcd.print(" SpO2:"); 
  lcd.print(currentSpo2);

  // Second row: "Temp: 37.5C"
  lcd.setCursor(0,1);
  lcd.print("Temp: "); 
  lcd.print(currentTemp);
  lcd.print("C");

  // 4. Send the manipulated data to the Blynk Website
  Blynk.virtualWrite(V0, currentBPM);  
  Blynk.virtualWrite(V1, currentSpo2);  
  Blynk.virtualWrite(V2, currentTemp);
}

void setup() {
  Serial.begin(115200);
  Serial.println("IOT Based Health Monitoring System");

  // Explicitly set I2C pins to match your Wokwi wiring
  Wire.begin(6, 7); // SDA = 6, SCL = 7

  // Initialize Screen and display startup text
  lcd.init();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("IoT Health");
  lcd.setCursor(0,1);
  lcd.print("Monitor System");
  delay(1500);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Connecting to");
  lcd.setCursor(0,1);
  lcd.print("WiFi & Blynk...");

  // Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Connected!");
  delay(1000);

  // Set the timer to read the potentiometers every 2 seconds
  timer.setInterval(2000L, sendSensorData);
}

void loop() {
  delay(10); // Keeps Wokwi simulation running smoothly
  Blynk.run();
  timer.run();
}