#include <BLEDevice.h>

const int ledPin = 5;  // LED connected to pin 13
const int buttonPin = 4;  // Button connected to pin 2

int blinkDelay = 1000;  // Initial blink delay (milliseconds)

unsigned long lastDebounceTime = 0;  // Last time button was checked
const unsigned long debounceDelay = 50;  // Debounce time (milliseconds)

BLEAdvertising *pAdvertising;

const char *names[] = {"Led Control 1", "Led Control 2", "Led Control 3", "Led Control 4"};
int currentNameIndex = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("Starting BLE advertising...");

   pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP); // Enable internal pull-up resistor for button

  BLEDevice::init("");  // Initialize BLE with a placeholder name

  pAdvertising = BLEDevice::getAdvertising();
  updateAdvertisementName();  // Set initial name
  pAdvertising->start();
}

void loop() {
  unsigned long currentMillis = millis();

  // Check for button press with debouncing
  if (currentMillis - lastDebounceTime >= debounceDelay) {
    if (digitalRead(buttonPin) == LOW) {
      lastDebounceTime = currentMillis;

      // Decrease blink delay (increase frequency)
      blinkDelay = blinkDelay > 200 ? blinkDelay - 200 : 200;  // Ensure minimum delay of 50ms
    }
  }

  // Blink the LED with the current delay
  digitalWrite(ledPin, LOW);
  delay(blinkDelay);
  digitalWrite(ledPin, HIGH);
  delay(blinkDelay);


  // BLE name change logic
  delay(5000);  // Change name every 5 seconds
  currentNameIndex = (currentNameIndex + 1) % 4;  // Rotate through names
  updateAdvertisementName();
}

void updateAdvertisementName() {
  const char *newName = names[currentNameIndex];
  Serial.println("Setting new name: " + String(newName));

  esp_ble_gap_set_device_name(newName);  // Set device name

  BLEAdvertisementData advData;
  advData.setFlags(0x06);  // General Discoverable + BR/EDR Not Supported
  advData.setName(newName);

  pAdvertising->setAdvertisementData(advData);
  pAdvertising->start();  // Restart advertising
}