#include <string.h>
#include <tty.h>
#include <stdio.h>
#include <port_io.h>

#include <kernel/intro.h>

void delay_us(uint32_t microseconds, uint32_t cpu_mhz)
{
  uint32_t count = cpu_mhz * microseconds;
  while (count--)
  {
    asm volatile ("nop" ::: "memory");
  }
}


int16_t begin_anim(const char* version)
{
  if (strlen(version) < 5)
  {
      return -1;
  }

  const char* e = "Espresso";
  const char* v = version;
  const char* n = "Press any key to continue";

  int32_t pos = 0;
  int32_t v_pos = 0;
  int16_t b = 0;
  int32_t sh_pos = VGA_WIDTH / 2;
  int32_t sv_pos = VGA_HEIGHT / 2;

  while (true)
  {
    terminal_clear();
    
    for (int32_t i = 0; n[i]; ++i)
    {
      terminal_putentryat(n[i], terminal_getcolor(), sh_pos, sv_pos);
      sh_pos++;
    }

    for (int32_t i = 0; e[i]; ++i)
    {
      terminal_putentryat(e[i], terminal_getcolor(), pos + i, v_pos);
    }

    if ((v_pos + 1) == VGA_HEIGHT)
    {
      v_pos = 0;
      b = 1;
    }

    for (int32_t i = 0; v[i]; ++i)
    {
      terminal_putentryat(v[i], terminal_getcolor(), pos + i + 3, (b == 0 ? (v_pos + 1) : v_pos));
    }

    pos += 2;
    v_pos++;
    sh_pos = VGA_WIDTH / 2;
    
    b = 0;

    delay_us(50000, 5000);
  }

  terminal_clear();

  return 0;
}