asset_loader.hpp

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#pragma once
#include "le2d/asset/asset_type_loader.hpp"
#include <klib/assert.hpp>
#include <gsl/pointers>
#include <memory>
#include <string_view>
#include <typeindex>
#include <unordered_map>
 
namespace le {
class AssetLoader {
  public:
    void add_loader(std::unique_ptr<detail::IAssetTypeLoaderBase> loader);
 
    template <std::derived_from<IAsset> AssetTypeT>
    [[nodiscard]] auto has_loader() const -> bool {
        return m_map.contains(typeid(AssetTypeT));
    }
 
    template <std::derived_from<IAsset> AssetTypeT>
    [[nodiscard]] auto load(std::string_view const uri) const -> std::unique_ptr<AssetTypeT> {
        auto ret = load_impl(typeid(AssetTypeT), uri);
        if (!ret) { return {}; }
        KLIB_ASSERT(dynamic_cast<AssetTypeT*>(ret.get()));
        return std::unique_ptr<AssetTypeT>{dynamic_cast<AssetTypeT*>(ret.release())};
    }
 
  private:
    [[nodiscard]] auto load_impl(std::type_info const& type, std::string_view uri) const -> std::unique_ptr<IAsset>;
 
    std::unordered_map<std::type_index, std::unique_ptr<detail::IAssetTypeLoaderBase>> m_map{};
};
} // namespace le