Initial work on asset system (does not compile)

1 files changed, 104 insertions, 0 deletions

diff --git a/core/src/Model/Assets.hpp b/core/src/Model/Assets.hpp
new file mode 100644
index 0000000..bc5219d
--- /dev/null
+++ b/core/src/Model/Assets.hpp
@@ -0,0 +1,104 @@
+#pragma once
+
+#include <tsl/array_map.h>
+#include <filesystem>
+#include <iosfwd>
+#include <memory>
+#include <string_view>
+
+/// A structure representing a ready-to-be-loaded asset, locating on the disk.
+struct SavedAsset
+{
+	std::filesystem::path Path;
+	std::string Name;
+	/// `Path`'s string form, encoded in UTF-8.
+	std::string PathString = Path.string();
+};
+
+class Asset
+{
+public:
+	Asset();
+	virtual ~Asset() = default;
+};
+
+class AssetCategory
+{
+public:
+	virtual ~AssetCategory() = default;
+
+	virtual void DiscoverFiles(const std::function<void(SavedAsset)>& callback) const = 0;
+
+	virtual Asset* CreateEmpty(const SavedAsset& diskForm) const = 0;
+	std::unique_ptr<Asset> CreateEmptyUnique(const SavedAsset& diskForm) const;
+	virtual Asset* Load(const SavedAsset& diskForm) const = 0;
+	std::unique_ptr<Asset> LoadUnique(const SavedAsset& diskForm) const;
+
+	/// This should call ImGui::BeginTable() along with other accessories such as setting up the header row.
+	virtual void SetupDetailsTable(const char* tableId) const = 0;
+	virtual void DrawBigIcon(const SavedAsset& asset) const = 0;
+	virtual void DrawDetailsTableRow(const SavedAsset& asset) const = 0;
+
+protected:
+	/* Helper loader functions */
+
+	static void DiscoverFilesByExtension(const std::function<void(SavedAsset)>& callback, const std::filesystem::path& containerDir, std::string_view extension);
+	static void DiscoverFilesByHeader(const std::function<void(SavedAsset)>& callback, const std::filesystem::path& containerDir, const std::function<bool(std::istream&)>& validater);
+};
+
+class AssetList
+{
+private:
+	const AssetCategory* mLoader;
+	tsl::array_map<char, SavedAsset> mAssets;
+	tsl::array_map<char, std::unique_ptr<Asset>> mCache;
+	int mCacheSizeLimit = 0;
+
+public:
+	AssetList(const AssetCategory& loader);
+
+	// TODO support file watches
+	void Reload();
+
+	const SavedAsset* FindByName(std::string_view name) const;
+	const SavedAsset& Create(SavedAsset asset);
+	std::unique_ptr<Asset> CreateAndLoad(SavedAsset asset);
+	std::unique_ptr<Asset> LoadFromDisk(std::string_view name) const;
+	bool Rename(std::string_view oldName, std::string_view newName);
+	bool Remove(std::string_view name);
+
+	int GetCacheSizeLimit() const;
+	void SetCacheSizeLimit(int limit);
+
+	struct DrawState
+	{
+		const SavedAsset* SelectedAsset = nullptr;
+	};
+	void DrawBigIcons(DrawState& state);
+	void DrawDetails(DrawState& state);
+};
+
+template <class TAsset>
+class TypedAssetList : public AssetList
+{
+public:
+	using Asset = TAsset;
+	using AssetType = typename TAsset::CategoryType;
+
+public:
+	// Import constructor
+	using AssetList::AssetList;
+
+	Asset* FindByName(std::string_view name) const
+	{
+		return static_cast<TAsset*>(AssetList::FindByName(name));
+	}
+	std::unique_ptr<Asset> Create(std::string_view name)
+	{
+		return std::unique_ptr<TAsset>(static_cast<TAsset*>(AssetList::Create(name).release()));
+	}
+	std::unique_ptr<Asset> LoadFromDisk(std::string_view name) const
+	{
+		return std::unique_ptr<TAsset>(static_cast<TAsset>(AssetList::LoadFromDisk(name)));
+	}
+};