/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#pragma once

#include "FontAtlas.hpp"
#include "SubpixelLayout.hpp"
#include "Data/Containers/Array.hpp"

namespace OpenVulkano::Scene
{
	class FontAtlasFactory final
	{
		struct FontIdentifier
		{
			FontIdentifier(const std::string_view& font, FontAtlasType atlasType) : font(font), atlasType(atlasType) { assert(atlasType.IsSDF()); }
			FontIdentifier(const std::string_view& font, FontAtlasType atlasType, SubpixelLayout subpixelLayout, float ptSize)
			: font(font), atlasType(atlasType), subpixelLayout(subpixelLayout), ptSize(ptSize) {}
			
			bool operator<(const FontIdentifier& other) const;
			
			std::string font;
			FontAtlasType atlasType;
			SubpixelLayout subpixelLayout = SubpixelLayout::UNKNOWN;
			float ptSize = 0;
		};

		static FontAtlasFactory INSTANCE;

		const bool m_allowSystemFonts;
		mutable std::map<FontIdentifier, FontAtlas::Ptr> m_atlasesCache;

	public:
		static FontAtlasFactory& GetInstance() { return INSTANCE; }

		FontAtlasFactory(const bool allowSystemFonts = true) : m_allowSystemFonts(allowSystemFonts) {}

		[[nodiscard]] FontAtlas::Ptr GetFontAtlasScalable(const std::string& fontIdentifier, bool msdf = true,
		                                                  const std::set<uint32_t>& charset = {}) const;

		[[nodiscard]] FontAtlas::Ptr GetFontAtlas(const std::string& fontIdentifier, float ptSize,
		                                          SubpixelLayout subpixelLayout = SubpixelLayout::UNKNOWN,
		                                          const std::set<uint32_t>& charset = {}) const;
	};
}