#include "pico/stdlib.h"
#include <stdio.h>

#define BUTTON 16
#define BUTTON2 19
#define BUTTON3 17
#define LED 13
#define LED2 9

#define UP 72
#define DOWN 80
#define LEFT 75
#define RIGHT 77

// #define WIDTH 5
// #define HEIGHT 5

// debouncer variables
static const uint8_t DEBOUNCE = 500; // debouncer delay
static bool pressed = false;
static int32_t alarm_id = 0;

int length;
int bend_no;
int len;
int life;
int move; //move = 1 up, move = 2 down, move = 3 left

struct cord {
  int x;
  int y;
  int dir;
};

typedef struct cord cordinate;
cordinate head, bend[500], food, body[30];


//draw board
void draw(int *dim)
{
  for (int i = 0; i < *dim; i++) {
    for (int j = 0; j < *dim; j++) {
      if (i == 0 || i == *dim - 1
          || j == 0
          || j == *dim - 1) {
        printf("#");
      }
      else {
        printf(" ");
      }
    }
    printf("\n");
  }
}


//display refresh
void cls() {
  int n;
  for (n = 0; n < 50; n++) {
    // clear enter screen
    printf("\n");
  }
  //locate at 1,1
  printf("\e[%d;%df", 1, 1);
}


// button functions
int64_t enable_button(alarm_id_t alarm_id, void *user_data) {
  pressed = false;
  return 0;
}

//button callback function
void button_callback(uint gpio, uint32_t events) {

  if (pressed) {
    cancel_alarm(alarm_id);
  }

  else {

    pressed = true;

    if (gpio == BUTTON) {         

      move = 1; //move up

    }

    else if (gpio == BUTTON2) { 

      move = 2; //move down

    }

    else if (gpio == BUTTON3) {
      move = 3; //move left
    }

    alarm_id = add_alarm_in_ms(DEBOUNCE, enable_button, NULL, false);
  }
}


int main() {

  stdio_init_all(); //intialize

  printf("LOADING GAME.........");

  sleep_ms(50); //delay

  //gpio initialization
  gpio_init(LED); // initialize LEDs
  gpio_init(LED2);

  gpio_init(BUTTON); // initialize button
  gpio_init(BUTTON2);

  gpio_set_dir(BUTTON, false);  // set direction to input
  gpio_set_dir(BUTTON2, false); 
  gpio_set_dir(BUTTON2, false); 

  gpio_set_dir(LED, true); //set direction to output
  gpio_set_dir(LED2, true);

  gpio_pull_down(BUTTON);  // pull down resistor
  gpio_pull_down(BUTTON2); 
  gpio_pull_down(BUTTON3); 

  gpio_set_irq_enabled_with_callback(
    BUTTON, 0x04, 1, button_callback); // attach interrupt to button
  gpio_set_irq_enabled(BUTTON2, GPIO_IRQ_EDGE_FALL,
                       true); // attach intr to button 2


  //intial characterstics of the snake
  length = 5;
  head.x = 25;
  head.y = 20;
  int dim = 30;

  //initialize array
  for (int i = 0; i < 30; i++)

  {

    body[i].x = 0;

    body[i].y = 0;

    if (i == length)

      break;
  }

  //draw board
  draw(&dim);

  while (true) {

    draw(&dim);
    sleep_ms(500);
    cls();

  }

  return 0;
}