#include <stdint.h>
#include <stdio.h>

#include <poll.h>
#include <termios.h>
#include <unistd.h>

void move_cursor(int direction) {
  if (direction == -1) {
    printf("\x0D ");
    printf("\x0D\x1B[1A>");
    printf("\x0D");
  } else if (direction == 1) {
    printf("\x0D ");
    printf("\x0D\x1B[1B>");
    printf("\x0D");
  }
  fflush(stdout);
}

struct termios setup_term() {
  struct termios old, new;

  tcgetattr(STDIN_FILENO, &old);

  new = old;

  new.c_lflag &= ~(ECHO | ICANON);
  new.c_cc[VMIN] = 0;  // bytes read to return
  new.c_cc[VTIME] = 0; // time before return

  tcsetattr(STDIN_FILENO, TCSANOW, &new);

  return old;
}

void return_term(struct termios *old) { tcsetattr(STDIN_FILENO, TCSANOW, old); }

void menu() {
  struct pollfd poller[1];

  poller[0].fd = STDIN_FILENO;
  poller[0].events = POLLIN;

  printf(" hallo\n felix\n lass\n minecraft\n spielen\n");
  printf("\x1B[5A>\x0D");
  fflush(stdout);

  uint8_t run = 1;
  while (run) {
    int events = poll(poller, 1, -1);
    if (events > 0 && poller[0].revents & POLLIN) {
      char buffer[10];
      uint16_t length = read(STDIN_FILENO, buffer, sizeof(buffer));
      if (length > 0) {
        uint8_t i;
        for (i = 0; i < length; i++) {
          if (buffer[i] == 'q')
            run = 0;
          else if (buffer[i] == 'j') {
            move_cursor(1);
          } else if (buffer[i] == 'k') {
            move_cursor(-1);
          }
        }
      }
    }
  }
}

int main() {
  struct termios old = setup_term();

  menu();

  return_term(&old);
  return 0;
}