#include <libk/std.h>
#include <libk/string.h>
#include <libk/printf.h>
#include <sys/debug.h>
#include <amd64/debug.h>
#include <amd64/io.h>

#define PORT_COM1   0x03F8
#define BUFFER_SIZE 1024

static bool amd64_debug_serial_tx_empty(void) {
  return (bool)(amd64_io_inb(PORT_COM1 + 5) & 0x20);
}

static void amd64_debug_serial_write(char x) {
  while (!amd64_debug_serial_tx_empty());
  amd64_io_outb(PORT_COM1, (uint8_t)x);
}

void debugprintf(const char *fmt, ...) {
  char buffer[BUFFER_SIZE];
  memset(buffer, 0, sizeof(buffer));

  va_list ap;
  va_start(ap, fmt);
  vsnprintf(buffer, sizeof(buffer), fmt, ap);
  va_end(ap);

  buffer[sizeof(buffer) - 1] = '\0';

  const char *p = buffer;
  while (*p) {
    amd64_debug_serial_write(*p);
    p++;
  }
}

void amd64_debug_init(void) {
  amd64_io_outb(PORT_COM1 + 1, 0x00);
  amd64_io_outb(PORT_COM1 + 3, 0x80);
  amd64_io_outb(PORT_COM1 + 0, 0x03);
  amd64_io_outb(PORT_COM1 + 1, 0x00);
  amd64_io_outb(PORT_COM1 + 3, 0x03);
  amd64_io_outb(PORT_COM1 + 2, 0xC7);
  amd64_io_outb(PORT_COM1 + 4, 0x0B);
}