#include <kernel/filesystem/mount.hpp>

#include <kernel/filesystem/dentry.hpp>
#include <kernel/filesystem/filesystem.hpp>

#include <kapi/system.hpp>

#include <kstd/memory>
#include <kstd/string>

#include <string_view>

namespace kernel::filesystem
{
  mount::mount(kstd::shared_ptr<dentry> const & mount_dentry, kstd::shared_ptr<dentry> const & root_dentry,
               kstd::shared_ptr<filesystem> const & fs, kstd::shared_ptr<mount> const & parent_mount)
      : m_mount_dentry(mount_dentry)
      , m_root_dentry(root_dentry)
      , m_filesystem(fs)
      , m_parent_mount(parent_mount)
      , m_ref_count(0)
  {
    if (!m_filesystem)
    {
      kapi::system::panic("[FILESYSTEM] mount initialized with null filesystem.");
    }
  }

  auto mount::get_mount_dentry() const -> kstd::shared_ptr<dentry> const &
  {
    return m_mount_dentry;
  }

  auto mount::get_filesystem() const -> kstd::shared_ptr<filesystem> const &
  {
    return m_filesystem;
  }

  auto mount::get_root_dentry() const -> kstd::shared_ptr<dentry> const &
  {
    return m_root_dentry;
  }

  auto mount::get_mount_path() const -> kstd::string
  {
    if (m_mount_dentry)
    {
      return m_mount_dentry->get_absolute_path();
    }
    return "/";
  }

  auto mount::get_parent_mount() const -> kstd::shared_ptr<mount> const &
  {
    return m_parent_mount;
  }

  auto mount::increment_ref_count() -> void
  {
    m_ref_count += 1;
  }

  auto mount::decrement_ref_count() -> bool
  {
    if (m_ref_count == 0)
    {
      return false;
    }

    m_ref_count -= 1;
    return true;
  }

  auto mount::is_ready_to_unmount() const -> bool
  {
    return m_ref_count == 0;
  }
}  // namespace kernel::filesystem