// 1. BLYNK SETUP (Place your credentials here)
#define BLYNK_TEMPLATE_ID "TMPL2epPvChmM"
#define BLYNK_TEMPLATE_NAME "esp assignment mobile"
#define BLYNK_AUTH_TOKEN "I2UR0_WIZiwNjRbLg8UZsYcD7fAcweBo"

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

// Your WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";



// 3. PIN DEFINITIONS
#define RED_LED      18
#define YELLOW_LED   19
#define GREEN_LED    23
#define BUZZER       16
#define BTN_TOGGLE   13
#define BTN_RESET    32
#define TONE_CRITICAL 2000

// 4. STATE MACHINE
enum State { NORMAL = 0, WARNING = 1, CRITICAL = 2 };
State currentState = NORMAL;

bool lastToggleState = HIGH;
bool lastResetState  = HIGH;

// --------------------- BLYNK APP COMMANDS ---------------------

// Remote Reset from App (V1)
BLYNK_WRITE(V1) {
  if (param.asInt() == 1) {
    Serial.println("Blynk: Remote Reset");
    resetToNormal();
  }
}

// Remote Toggle from App (V2)
BLYNK_WRITE(V2) {
  if (param.asInt() == 1) {
    Serial.println("Blynk: Remote Toggle");
    changeState();
  }
}

// ------------------------- SETUP ---------------------------

void setup() {
  Serial.begin(115200);
  
  // Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  pinMode(GREEN_LED,  OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(RED_LED,    OUTPUT);
  pinMode(BUZZER,     OUTPUT);

  pinMode(BTN_TOGGLE, INPUT_PULLUP);
  pinMode(BTN_RESET,  INPUT_PULLUP);

  updateSystem(); 
}

// -------------------------- LOOP ---------------------------

void loop() {
  Blynk.run(); // Keep connection alive

  // 1. Physical Toggle Button
  bool toggleReading = digitalRead(BTN_TOGGLE);
  if (toggleReading == LOW && lastToggleState == HIGH) {
    delay(50); // debounce
    if (digitalRead(BTN_TOGGLE) == LOW) {
      changeState();
      delay(200); 
    }
  }
  lastToggleState = toggleReading;

  // 2. Physical Reset Button
  bool resetReading = digitalRead(BTN_RESET);
  if (resetReading == LOW && lastResetState == HIGH) {
    delay(50);
    if (digitalRead(BTN_RESET) == LOW) {
      resetToNormal();
      delay(200);
    }
  }
  lastResetState = resetReading;

  // 3. Buzzer Logic
  if (currentState == CRITICAL) {
    tone(BUZZER, TONE_CRITICAL);
  } else {
    noTone(BUZZER);
  }
}

// ---------------------- HELPER FUNCTIONS ------------------

void changeState() {
  if (currentState == NORMAL) currentState = WARNING;
  else if (currentState == WARNING) currentState = CRITICAL;
  else currentState = NORMAL;

  updateSystem();
}

void resetToNormal() {
  currentState = NORMAL;
  updateSystem();
}

void updateSystem() {
  // Update Physical Hardware
  digitalWrite(GREEN_LED,  (currentState == NORMAL)   ? HIGH : LOW);
  digitalWrite(YELLOW_LED, (currentState == WARNING)  ? HIGH : LOW);
  digitalWrite(RED_LED,    (currentState == CRITICAL) ? HIGH : LOW);

  // Update Blynk App
  Blynk.virtualWrite(V0, (int)currentState);            // Update state number
  Blynk.virtualWrite(V3, (currentState == CRITICAL) ? 255 : 0); // Update App LED brightness

  // Serial Monitor Debugging
  Serial.print("System State: ");
  Serial.println(currentState);
}