#define BLYNK_TEMPLATE_ID "TMPL3XjajWIg-"
#define BLYNK_TEMPLATE_NAME "Elderly care"
#define BLYNK_AUTH_TOKEN "YnoTi4gGL3-PUsdooLVS1WzZZ8eFKBSH"

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

char ssid[] = "Wokwi-GUEST";   // Wokwi default
char pass[] = "";              // no password

#define BUTTON_PIN 13
#define HEART_PIN 34
#define BP_PIN 35
#define BUZZER_PIN 26   
#define PIR_PIN 15
#define FAN_LED 14
#define LIGHT_LED 17
#define FAN_BUTTON 18
#define LIGHT_BUTTON 19

int heartValue, bpValue;
bool alertSent = false;
bool fanState = false;
bool lightState = false;
unsigned long lastSensorRead = 0;
unsigned long lastButtonCheck = 0;

void sendSensorData() {
  heartValue = analogRead(HEART_PIN);
  bpValue = analogRead(BP_PIN);  
  int heartRate = map(heartValue, 0, 4095, 60, 120);
  int bp = map(bpValue, 0, 4095, 90, 150);

  Serial.printf("Heart: %d bpm | BP: %d mmHg\n", heartRate, bp);

  // Send data to Blynk App
  Blynk.virtualWrite(V0, heartRate);
  Blynk.virtualWrite(V1, bp);

  // Abnormal condition detection
  if (heartRate < 60 || heartRate > 110 || bp > 140) {
    if (!alertSent) {
      Serial.println("ALERT: Abnormal vitals detected!");
      digitalWrite(BUZZER_PIN, HIGH);
      delay(300);
      digitalWrite(BUZZER_PIN, LOW);
      Blynk.logEvent("vitals_alert", "Abnormal vitals detected!");
      alertSent = true;
    }
  } else {
    alertSent = false;
  }
}

void checkButton() {
  if (digitalRead(BUTTON_PIN) == LOW) {
    Serial.println("Emergency button pressed!");
    digitalWrite(BUZZER_PIN, HIGH);  
    delay(300);                      
    digitalWrite(BUZZER_PIN, LOW);   
    Blynk.virtualWrite(V2, 1);
    Blynk.logEvent("sos_alert", "Emergency button pressed!");
  } else {
    Blynk.virtualWrite(V2, 0);
  }
}

void checkMotion() {
  if (digitalRead(PIR_PIN) == HIGH) {
    Serial.println("Fall detection");
    digitalWrite(BUZZER_PIN, HIGH); 
    delay(300);
    digitalWrite(BUZZER_PIN, LOW);
    Blynk.virtualWrite(V3, 1);
    Blynk.logEvent("fall_alert", "Fall detected!");
  } else {
    Blynk.virtualWrite(V3, 0);
  }
}

void checkHomeAutomation() {
  // Fan toggle
  if (digitalRead(FAN_BUTTON) == LOW) {
    fanState = !fanState;
    digitalWrite(FAN_LED, fanState);
    Serial.println(fanState ? "Fan ON" : "Fan OFF");
    delay(300);
  }
  // Light toggle
  if (digitalRead(LIGHT_BUTTON) == LOW) {
    lightState = !lightState;
    digitalWrite(LIGHT_LED, lightState);
    Serial.println(lightState ? "Light ON" : "Light OFF");
    delay(300);
  }
}

void setup() {
  Serial.begin(115200);

  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(FAN_LED, OUTPUT);
  pinMode(LIGHT_LED, OUTPUT);
  pinMode(FAN_BUTTON, INPUT_PULLUP);
  pinMode(LIGHT_BUTTON, INPUT_PULLUP);

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

void loop() {
  Blynk.run();

  unsigned long currentMillis = millis();

  if (currentMillis - lastSensorRead >= 2000) { 
    sendSensorData();
    lastSensorRead = currentMillis;
  }
  if (currentMillis - lastButtonCheck >= 500) { 
    checkButton();
    lastButtonCheck = currentMillis;
  }

  checkMotion();
  checkHomeAutomation();
}