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

#define LED 2
#define Push_Button 4

bool gpio_value = false;//default state to be 
static void IRAM_ATTR gpio_isr_handler(void *arg)   //handler function of the code after isr
{
  /*
  Good to DO - Implement the bouncing algorithm
  to eliminate the Spurious Interrupt trigger 
  */

  /*Disable the interrupt*/
  gpio_intr_disable(Push_Button);//Disable the Interrupt on the LED Pin
  gpio_isr_handler_remove(Push_Button); //Remove the Interrupt service routine on the Push Button

  /*Button is pressed. Toggle the LED */
  gpio_set_level(LED, gpio_value); //Set the level of the LED pin 
  /*Change state of the LED*/
  gpio_value = !gpio_value;        //Reset the level of the LED pin

  /*Re-Enable the Interrupt*/
  gpio_isr_handler_add(Push_Button, gpio_isr_handler, NULL); //Enable the interrupt routine on the push button
  gpio_intr_enable(Push_Button); //Enable the Interrupt on the Push button
}

void app_main(void)
{
  /*Reset the pin*/
  gpio_reset_pin(LED); //Reset the LED pin
  gpio_reset_pin(Push_Button); //Reset the PushButton Pin

  /*Set the GPIOs to Output mode*/
  gpio_set_direction(LED, GPIO_MODE_OUTPUT); //Set the GPIO MODE of the LED as output
  gpio_set_direction(Push_Button, GPIO_MODE_INPUT); //Set the GPIO MODE of the Push button as input

  /*Enable Pullup for Input PIN*/
  gpio_pullup_en(Push_Button); //Enable Pullup

  /*Disable Pulldown for Input Pin*/
  gpio_pulldown_dis(Push_Button);

  /*Configure Raising Edge detection Interrupt for Input PIn*/
  gpio_set_intr_type(Push_Button, GPIO_INTR_POSEDGE);  //Set the interrupt on the GPIO as positive edge
  //Whenever press then release the button->it rises->set interrupt to positive edge which is the period that signal is changing from LOW to HIGH
  /*install gpio isr service to default values*/
  gpio_install_isr_service(0);

  /*Attach the ISR to the GPIO interrupt*/
  gpio_isr_handler_add(Push_Button, gpio_isr_handler,NULL);

  /*Enable the Interrupt*/
  gpio_intr_enable(Push_Button);

  while(true){
    if(gpio_get_level(LED))
        printf("ON");
    vTaskDelay(100/portTICK_PERIOD_MS);
    if(!gpio_get_level(LED))
        printf("OFF\n");
    vTaskDelay(100/portTICK_PERIOD_MS);
  }
}