#include <device/device.h>
#include <device/ramdrv.h>
#include <device/terminal.h>
#include <kb_device.h>
#include <libk/align.h>
#include <libk/fieldlengthof.h>
#include <libk/rbtree.h>
#include <libk/std.h>
#include <libk/string.h>
#include <limine/requests.h>
#include <mm/liballoc.h>
#include <ramdisk_device.h>
#include <sync/spin_lock.h>
#include <sys/debug.h>
#include <terminal_device.h>
#include <xdrv_device.h>

#if defined(__x86_64__)
#include <device/ps2_kb.h>
#endif

static struct rb_node_link* device_tree = NULL;
static spin_lock_t device_tree_lock;

struct device* device_create (int id, device_op_func_t* ops, size_t ops_len,
                              device_init_func_t init, device_fini_func_t fini, void* arg) {
  if (ops_len >= fieldlengthof (struct device, ops))
    return NULL;

  struct device* device = malloc (sizeof (*device));

  if (device == NULL)
    return NULL;

  memset (device, 0, sizeof (*device));

  device->id = id;
  device->init = init;
  device->fini = fini;

  if (ops != NULL)
    memcpy (device->ops, ops, ops_len * sizeof (device_op_func_t));

  if (!device->init (device, arg)) {
    free (device);
    return NULL;
  }

  spin_lock (&device_tree_lock);
  rbtree_insert (struct device, &device_tree, &device->device_tree_link, device_tree_link, id);
  spin_unlock (&device_tree_lock);

  return device;
}

void device_delete (struct device* device) {
  spin_lock (&device_tree_lock);
  spin_lock (&device->lock);

  rbtree_delete (&device_tree, &device->device_tree_link);

  spin_unlock (&device->lock);
  spin_unlock (&device_tree_lock);

  device->fini (device);
  free (device);
}

struct device* device_find (int id) {
  struct device* device = NULL;

  spin_lock (&device_tree_lock);
  rbtree_find (struct device, &device_tree, id, device, device_tree_link, id);
  spin_unlock (&device_tree_lock);

  return device;
}

void terminal_device_init (void) {
  device_op_func_t ops[] = {
      [TERMINAL_PUTSTR] = &terminal_putstr,
  };
  device_create (TERMINAL_DEVICE, ops, lengthof (ops), &terminal_init, &terminal_fini, NULL);
}

void ramdisk_device_init (void) {
  device_op_func_t ops[] = {
      [XDRV_GET_SIZE] = &ramdrv_get_size,
      [XDRV_GET_SECTOR_SIZE] = &ramdrv_get_sector_size,
      [XDRV_GET_DEVICE_TYPE] = &ramdrv_get_device_type,
      [XDRV_READ] = &ramdrv_read,
  };

  struct limine_module_response* module = limine_module_request.response;

  const char* ramdisk_path = "/boot/mop3dist.tar";
  struct limine_file* file = NULL;

  for (size_t i = 0; i < module->module_count; i++) {
    file = module->modules[i];

    if (strncmp (file->path, ramdisk_path, strlen (ramdisk_path)) == 0)
      break;
  }

  struct ramdrv_init init = {
      .total_size = file->size,
      .sector_size = 1024,
      .buffer = file->address,
  };
  device_create (RAMDISK_DEVICE, ops, lengthof (ops), &ramdrv_init, &ramdrv_fini, &init);
}

#if defined(__x86_64__)
void ps2kb_device_init (void) {
  device_op_func_t ops[] = {
      [KB_READ_KEY] = &ps2kb_read_key,
  };
  device_create (KB_DEVICE, ops, lengthof (ops), &ps2kb_init, &ps2kb_fini, NULL);
}
#endif

void devices_init (void) {
  terminal_device_init ();
  ramdisk_device_init ();

#if defined(__x86_64__)
  ps2kb_device_init ();
#endif
}