// Copyright 2023 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include "VideoCommon/Assets/CustomAsset.h"

#include <utility>

namespace VideoCommon
{
CustomAsset::CustomAsset(std::shared_ptr<CustomAssetLibrary> library,
                         CustomAssetLibrary::AssetID asset_id, u64 asset_handle)
    : m_owning_library(std::move(library)), m_asset_id(std::move(asset_id)), m_handle(asset_handle)
{
}

quiesce_t* CustomAsset::DataQuiesce()
{
  static quiesce_t s_quiesce;
  return &s_quiesce;
}

std::size_t CustomAsset::Load()
{
  if (!retro_atomic_cas_int(&m_busy, 0, 1))
    return 0;
  // The load time needs to come from before the data is actually read.
  // Using a time point from after the read marks the asset as more up-to-date than it actually is,
  //  and has potential to race (and not be updated) if a change happens immediately after load.
  const auto load_time = ClockType::now();

  const auto load_information = LoadImpl(m_asset_id);
  if (load_information.bytes_loaded > 0)
  {
    m_bytes_loaded = load_information.bytes_loaded;
    retro_atomic_store_release_64(&m_last_loaded_time, load_time.time_since_epoch().count());
    retro_atomic_store_release_int(&m_busy, 0);
    return load_information.bytes_loaded;
  }
  retro_atomic_store_release_int(&m_busy, 0);
  return 0;
}

std::size_t CustomAsset::Unload()
{
  if (!retro_atomic_cas_int(&m_busy, 0, 1))
    return 0;
  UnloadImpl();
  const std::size_t unloaded = std::exchange(m_bytes_loaded, 0);
  retro_atomic_store_release_int(&m_busy, 0);
  return unloaded;
}

CustomAsset::TimeType CustomAsset::GetLastLoadedTime() const
{
  return TimeType(ClockType::duration(retro_atomic_load_acquire_64(&m_last_loaded_time)));
}

std::size_t CustomAsset::GetHandle() const
{
  return m_handle;
}

const CustomAssetLibrary::AssetID& CustomAsset::GetAssetId() const
{
  return m_asset_id;
}

}  // namespace VideoCommon