// 2209106083
// Syarifah Armilda Syahla
#include <Arduino.h>
#include "esp_timer.h"

#define LED_PIN 2
#define BTN 4

bool ledState = false;
bool timerRunning = true;
esp_timer_handle_t timer;

volatile bool buttonPressed = false;
volatile unsigned long lastInterruptTime = 0;  // Waktu terakhir interrupt

const unsigned long debounceDelay = 200;  // debounce 200 ms

void IRAM_ATTR onTimer(void* arg) {
  ledState = !ledState;
  digitalWrite(LED_PIN, ledState);
}

void IRAM_ATTR handleButtonInterrupt() {
  unsigned long currentTime = millis();
  if (currentTime - lastInterruptTime > debounceDelay) {
    buttonPressed = true;
    lastInterruptTime = currentTime;
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BTN, INPUT_PULLUP);

  // Setup timer
  esp_timer_create_args_t timer_args = {
    .callback = &onTimer,
    .arg = NULL,
    .dispatch_method = ESP_TIMER_TASK,
    .name = "periodic"
  };

  if (esp_timer_create(&timer_args, &timer) != ESP_OK) {
    Serial.println("GAGAL: Membuat timer");
    while (1);
  }

  if (esp_timer_start_periodic(timer, 1000000) != ESP_OK) {
    Serial.println("GAGAL: Menjalankan timer");
    while (1);
  }

  // Attach interrupt on falling edge (tombol ditekan)
  attachInterrupt(digitalPinToInterrupt(BTN), handleButtonInterrupt, FALLING);
}

void loop() {
  if (buttonPressed) {
    buttonPressed = false;  // Reset flag

    if (timerRunning) {
      esp_timer_stop(timer);
      Serial.println("Timer dihentikan oleh tombol.");
    } else {
      esp_timer_start_periodic(timer, 1000000);
      Serial.println("Timer dijalankan lagi oleh tombol.");
    }
    timerRunning = !timerRunning;
  }

  // Loop kosong, semua di-handle oleh interrupt dan flag
}