#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_log.h"

void IRAM_ATTR button_isr_handler(void* arg);

#define SENSOR_PIN 4  // Button connected to GPIO4
#define LED_PIN 2

bool sensor_called = false; // Global flag for ISR
bool Body_detected = false;

void app_main() {
  // Configuring GPIO as input
  gpio_set_direction(SENSOR_PIN, GPIO_MODE_INPUT);
  gpio_set_level(LED_PIN, GPIO_MODE_OUTPUT);

  // Setting interrupt on FALLING edge (button press)
  gpio_set_intr_type(SENSOR_PIN, GPIO_INTR_ANYEDGE);

  // Install ISR service (interrupt handling)
  gpio_install_isr_service(0);

  // Attaching ISR handler to SENSOR_PIN
  gpio_isr_handler_add(SENSOR_PIN, button_isr_handler, NULL);

  while (1) {
    if (sensor_called) {  // Check flag in main loop
      sensor_called = false;  // Reset flag
      

      if (Body_detected) {
        printf("body detected\n");
        gpio_set_level(LED_PIN, 1);
      }
      else {
        printf("no body detected\n");
        gpio_set_level(LED_PIN, 0);
      }
      
    }
    printf("Main loop running...\n");
    vTaskDelay(pdMS_TO_TICKS(100));  // loop continues running
  }

}
// Interrupt Service Routine (ISR)
void IRAM_ATTR button_isr_handler(void* arg) {
  int body = gpio_get_level(SENSOR_PIN);
  Body_detected = (body == 1);
  sensor_called = true;
}