#include "config.h"

// State variables to track button behavior [cite: 64-66, 77]
bool lastRawState = HIGH;   
bool stableState = HIGH;    
unsigned long lastChangeTime = 0; 
bool ledState = false;      

void setup() {
  Serial.begin(SERIAL_BAUD); [cite: 58]
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Use internal pull-up [cite: 27, 38]
  pinMode(LED_PIN, OUTPUT); [cite: 38]

  // Initial boot message [cite: 92]
  Serial.println(FIRMWARE_NAME); 
  Serial.print("[BOOT] PIN-");
  Serial.println(BUTTON_PIN);
}

void loop() {
  bool raw = digitalRead(BUTTON_PIN); [cite: 69]

  // If the button state just changed, reset the timer [cite: 72, 119]
  if (raw != lastRawState) {
    lastChangeTime = millis();
    lastRawState = raw;
  }

  // Only act if the state has been stable for 30ms [cite: 50, 71]
  if ((millis() - lastChangeTime) >= DEBOUNCE_MS) {
    
    // Check if the stable state is different from the previous one [cite: 71]
    if (raw != stableState) {
      bool prevStable = stableState;
      stableState = raw; 

      // Falling Edge Detection: Trigger only when pressed (HIGH to LOW) [cite: 78, 82]
      if (prevStable == HIGH && stableState == LOW) {
        ledState = !ledState; 
        digitalWrite(LED_PIN, ledState); [cite: 83]
        
        // Log the event to Serial Monitor [cite: 109]
        Serial.print("[PRESS] LED -> ");
        Serial.println(ledState ? "ON" : "OFF");
      }
    }
  }
}