#include "devices.h"
#include <unistd.h>   
#include <string.h>   

i32 console_open(void *data, u32 mode) {
    USED(mode);
    USED(data);
    /* Nothing to open — stdin/stdout are always available */
    return 0;  /* Success */
}

i32 console_read(void *data, u8 *buffer, u32 size) {
    USED(data);
    ssize_t result = read(STDIN_FILENO, buffer, size);
    if (result < 0) return -1;  /* Error */
    return (i32)result;         /* Bytes read */
}

i32 console_write(void *data, const u8 *buffer, u32 size) {
    USED(data);
    ssize_t result = write(STDOUT_FILENO, buffer, size);
    if (result < 0) return -1;  /* Error */
    return (i32)result;         /* Bytes written */
}

i32 console_close(void *data) {
    USED(data);
    /* Nothing to close — stdin/stdout are process-owned */
    return 0;
}

i32 console_ioctl(void *data, u32 cmd, void *args) {
    USED(data);
    USED(cmd);
    USED(args);
    return -1; /* Unsupported */
}

i32 screen_open(void *data, u32 mode) {
  USED(mode);
  ScreenDeviceData *screen = (ScreenDeviceData *)data;
  USED(screen);

    return 0;
}

i32 screen_read(void *data, u8 *buffer, u32 size) { 
  USED(data);
  USED(buffer);
  USED(size);
  return -1; 
}

i32 screen_write(void *data, const u8 *buffer, u32 size) {
  ScreenDeviceData *screen = (ScreenDeviceData *)data;

  if (size > screen->framebuffer_size * sizeof(u8)) {
    return -1;
  }

  memcpy(&screen->vm->memory[screen->framebuffer_pos], buffer, size);
  return 0;
}

i32 screen_close(void *data) {
  ScreenDeviceData *screen = (ScreenDeviceData *)data;
  USED(screen);

  return 0;
}

i32 keyboard_open(void *data, u32 mode) {
  USED(data);
  USED(mode);
  return 0; 
}

i32 keyboard_read(void *data, u8 *buffer, u32 size) {
  KeyboardDeviceData *kbd = (KeyboardDeviceData *)data;

  if (size < (u32)kbd->key_count)
    return -1;

  memcpy(buffer, kbd->keys, kbd->key_count);
  return 0;
}

i32 keyboard_write(void *data, const u8 *buffer, u32 size) {
  USED(data);
  USED(buffer);
  USED(size);
  return -1; /* not writable */
}

i32 keyboard_close(void *data) { 
  USED(data);
  return 0;
}