1 files changed, 130 insertions, 0 deletions
diff --git a/app/source/Cplt/Model/Assets.hpp b/app/source/Cplt/Model/Assets.hpp
new file mode 100644
index 0000000..d2f8570
--- /dev/null
+++ b/app/source/Cplt/Model/Assets.hpp
@@ -0,0 +1,130 @@
+#pragma once
+
+#include <Cplt/Utils/UUID.hpp>
+#include <Cplt/fwd.hpp>
+
+#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.
+/// Each asset should be identified by a unique uuid within the asset category (i.e. a workflow and a template can share the same uuid),
+/// generated on insertion to an asset list if not given by the caller.
+struct SavedAsset
+{
+	std::string Name;
+	/// UUID of this asset. This field is generated as a random UUID v4 upon insertion into an AssetList, if not already provided by the caller (indicated by !is_nil()).
+	uuids::uuid Uuid;
+	/// Extra data to be used by the AssetList/Asset implementation.
+	uint64_t Payload;
+
+	void ReadFromDataStream(InputDataStream& stream);
+	void WriteToDataStream(OutputDataStream& stream) const;
+};
+
+class Asset
+{
+public:
+	Asset();
+	virtual ~Asset() = default;
+};
+
+enum class NameSelectionError
+{
+	None,
+	Duplicated,
+	Empty,
+};
+
+class AssetList
+{
+private:
+	class Private;
+	std::unique_ptr<Private> mPrivate;
+
+public:
+	AssetList(Project& project);
+	virtual ~AssetList();
+
+	Project& GetConnectedProject() const;
+
+	// TODO support file watches
+	void Reload();
+
+	int GetCount() const;
+	// TODO convert to custom iterable
+	const tsl::array_map<char, SavedAsset>& GetAssets() const;
+
+	const SavedAsset* FindByName(std::string_view name) const;
+	const SavedAsset& Create(SavedAsset asset);
+	std::unique_ptr<Asset> CreateAndLoad(SavedAsset asset);
+	/// Load the asset on disk by its name.
+	std::unique_ptr<Asset> Load(std::string_view name) const;
+	/// Load the asset on disk by a reference to its SavedAsset instance. This function assumes that the given SavedAsset
+	/// is stored in AssetList, otherwise the behavior is undefined.
+	std::unique_ptr<Asset> Load(const SavedAsset& asset) const;
+	const SavedAsset* Rename(std::string_view oldName, std::string_view newName);
+	bool Remove(std::string_view name);
+
+	int GetCacheSizeLimit() const;
+	void SetCacheSizeLimit(int limit);
+
+	struct ListState
+	{
+		const SavedAsset* SelectedAsset = nullptr;
+	};
+	void DisplayIconsList(ListState& state);
+	void DisplayDetailsList(ListState& state);
+	void DisplayControls(ListState& state);
+
+protected:
+	virtual void DiscoverFiles(const std::function<void(SavedAsset)>& callback) const = 0;
+
+	// Helper
+	void DiscoverFilesByExtension(const std::function<void(SavedAsset)>& callback, const std::filesystem::path& containerDir, std::string_view extension) const;
+	void DiscoverFilesByHeader(const std::function<void(SavedAsset)>& callback, const std::filesystem::path& containerDir, const std::function<bool(std::istream&)>& validater) const;
+
+	/// Create an empty/default instance of this asset type on disk, potentially qualified by SavedAsset::Payload.
+	/// Return `true` on success and `false` on failure.
+	virtual bool SaveInstance(const SavedAsset& assetInfo, const Asset* asset) const = 0;
+	/// The returned pointer indicate ownership to the object.
+	virtual Asset* LoadInstance(const SavedAsset& assetInfo) const = 0;
+	/// Create an empty/default instance of this asset type, potentially qualified by SavedAsset::Payload.
+	/// The returned pointer indicate ownership to the object.
+	virtual Asset* CreateInstance(const SavedAsset& assetInfo) const = 0;
+	virtual bool RenameInstanceOnDisk(const SavedAsset& assetInfo, std::string_view oldName) const = 0;
+
+	virtual std::string RetrieveNameFromFile(const std::filesystem::path& file) const = 0;
+	virtual uuids::uuid RetrieveUuidFromFile(const std::filesystem::path& file) const = 0;
+	virtual std::filesystem::path RetrievePathFromAsset(const SavedAsset& asset) const = 0;
+
+	virtual void DisplayAssetCreator(ListState& state) = 0;
+	virtual void DisplayDetailsTable(ListState& state) const = 0;
+};
+
+template <class T>
+class AssetListTyped : public AssetList
+{
+public:
+	using AssetList::AssetList;
+
+#pragma clang diagnostic push
+#pragma ide diagnostic ignored "HidingNonVirtualFunction"
+	std::unique_ptr<T> CreateAndLoad(SavedAsset asset)
+	{
+		return std::unique_ptr<T>(static_cast<T*>(AssetList::CreateAndLoad(asset).release()));
+	}
+
+	std::unique_ptr<T> Load(std::string_view name) const
+	{
+		return std::unique_ptr<T>(static_cast<T*>(AssetList::Load(name).release()));
+	}
+
+	std::unique_ptr<T> Load(const SavedAsset& asset) const
+	{
+		return std::unique_ptr<T>(static_cast<T*>(AssetList::Load(asset).release()));
+	}
+#pragma clang diagnostic pop
+};