#include "filesystem/inode.hpp"

#include "kapi/system.hpp"

#include "devices/device.hpp"
#include "filesystem/inode_metadata.hpp"

#include <kstd/memory>

#include <cstddef>

namespace filesystem
{
  inode::inode(inode_kind kind)
      : m_kind(kind)
  {}

  inode::inode(kstd::shared_ptr<devices::device> device)
      : m_kind(inode_kind::device)
      , m_device(device)
  {
    if (!m_device)
    {
      kapi::system::panic("[FILESYSTEM] inode constructed with null device.");
    }
  }

  auto inode::metadata() const -> inode_metadata
  {
    auto meta = inode_metadata{};
    meta.kind = m_kind;

    if (is_device())
    {
      meta.major = m_device->major();
      meta.minor = m_device->minor();
    }

    return meta;
  }

  auto inode::is_directory() const -> bool
  {
    return m_kind == inode_kind::directory;
  }

  auto inode::is_regular() const -> bool
  {
    return m_kind == inode_kind::regular;
  }

  auto inode::is_device() const -> bool
  {
    return m_kind == inode_kind::device;
  }

  auto inode::is_block_device() const -> bool
  {
    return is_device() && m_device->is_block_device();
  }

  auto inode::major_device() const -> size_t
  {
    if (!is_device())
    {
      kapi::system::panic("[FILESYSTEM] inode::major_device called on non-device inode.");
    }

    return m_device->major();
  }

  auto inode::minor_device() const -> size_t
  {
    if (!is_device())
    {
      kapi::system::panic("[FILESYSTEM] inode::minor_device called on non-device inode.");
    }

    return m_device->minor();
  }

  auto inode::backing_device() const -> kstd::shared_ptr<devices::device>
  {
    return m_device;
  }

  auto inode::read(void * /*buffer*/, size_t /*offset*/, size_t /*size*/) const -> size_t
  {
    if (is_device())
    {
      kapi::system::panic("[FILESYSTEM] inode::read called on device inode. Open it as a device file first.");
    }

    // TODO BA-FS26
    return 0;
  }

  auto inode::write(void const *, size_t, size_t) -> size_t
  {
    if (is_device())
    {
      kapi::system::panic("[FILESYSTEM] inode::write called on device inode. Open it as a device file first.");
    }

    kapi::system::panic("[FILESYSTEM] inode::write is not implemented yet");
    return 0;
  }
}  // namespace filesystem