#include <stdio.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "inttypes.h"
#include "esp_log.h"
#define ledpin 2
#define buttonpin 32
  int check = 0;

struct Node {
    int data;
    struct Node* next;
};

struct Node* createNode(int value) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    if (newNode == NULL) {
        printf("Memory allocation failed\n");
        exit(1);
    }
    newNode->data = value;
    newNode->next = NULL;
    return newNode;
}

void insertAtBeginning(struct Node** head, int value) {
    struct Node* newNode = createNode(value);
    newNode->next = *head;
    *head = newNode;
}

void insertAtEnd(struct Node** head, int value) {
    struct Node* newNode = createNode(value);
    if (*head == NULL) {
        *head = newNode;
        return;
    }
    struct Node* temp = *head;
    while (temp->next != NULL) {
        temp = temp->next;
    }
    temp->next = newNode;
}

void deleteNode(struct Node** head, int value) {
    struct Node* temp = *head;
    struct Node* prev = NULL;

    // If head itself holds the value
    if (temp != NULL && temp->data == value) {
        *head = temp->next;
        free(temp);
        return;
    }

    // Search for the value
    while (temp != NULL && temp->data != value) {
        prev = temp;
        temp = temp->next;
    }

    // Value not found
    if (temp == NULL) return;

    // Unlink the node
    prev->next = temp->next;
    free(temp);
}

void printList(struct Node* head) {
    struct Node* temp = head;
    while (temp != NULL) {
        printf("%d -> ", temp->data);
        temp = temp->next;
    }
    printf("NULL\n");
}

// Free the list (to avoid memory leaks)
void freeList(struct Node* head) {
    struct Node* temp;
    while (head != NULL) {
        temp = head;
        head = head->next;
        free(temp);
    }
}


static void IRAM_ATTR gpio_isr_handler(void *arg){
          
      if(check==1){
      gpio_set_level(ledpin,0);
      check=0;  
      }
      else{
              gpio_set_level(ledpin,1);
      check=1; 
      }

}
void app_main() {
   //printf("Hello, Wokwi!\n");
  gpio_reset_pin(ledpin);
  gpio_reset_pin(buttonpin);
  gpio_set_direction(ledpin,GPIO_MODE_OUTPUT);
  gpio_set_direction(buttonpin,GPIO_MODE_INPUT);
  gpio_set_pull_mode(buttonpin,GPIO_PULLUP_ONLY);
  gpio_set_intr_type(buttonpin,GPIO_INTR_NEGEDGE);
  gpio_install_isr_service(0);
  gpio_isr_handler_add(buttonpin,gpio_isr_handler,NULL);
  gpio_intr_enable(buttonpin);

      struct Node* head = NULL;

    insertAtBeginning(&head, 10);
    insertAtBeginning(&head, 20);
    insertAtEnd(&head, 30);
    insertAtEnd(&head, 40);

    printf("Linked List: ");
    printList(head);

    printf("Deleting 20...\n");
    deleteNode(&head, 20);
    printList(head);

    freeList(head);

  while (true) {
   //  gpio_set_pull_mode(buttonpin,GPIO_PULLUP_ONLY);
    // if(gpio_get_level(buttonpin)==false){
    //   if(check==1){
    //   gpio_set_level(ledpin,0);
    //   printf("1\n");
    //   check=0;  
    //   }
    //   else{
    //     printf("2\n");
    //           gpio_set_level(ledpin,1);
    //   check=1; 
    //   }

    // }
    vTaskDelay(100 / portTICK_PERIOD_MS);

  }
}