/*
 * 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 "IFontAtlasGenerator.hpp"
#include "AtlasData.hpp"
#include "Math/AABB.hpp"
#include "Extensions/FreetypeHelper.hpp"
#include <variant>

namespace OpenVulkano::Scene
{
	class FontAtlasGeneratorBase : public IFontAtlasGenerator
	{
	protected:
		int m_channelsCount;
		std::shared_ptr<AtlasData> m_atlasData;

	public:
		FontAtlasGeneratorBase(const int channelsCount) : m_channelsCount(channelsCount) {}
		void SaveAtlasMetadataInfo(const std::string& outputFile, bool packIntoSingleFile = true) const override;
		[[nodiscard]] const std::shared_ptr<AtlasData>& GetAtlasData() const override { return m_atlasData; }
		[[nodiscard]] int GetAtlasChannelsCount() const { return m_channelsCount; }
		[[nodiscard]] static std::set<uint32_t> LoadAllGlyphs(const std::variant<std::string, Array<char>>& data);

	protected:
		void SavePng(std::string output) const;
		void SetupAtlasData(Math::Vector2ui textureResolution, double lineHeight, FontAtlasType::Type atlasType);
		void SetGlyphData(GlyphInfo& info, Math::Vector2d bearing, Math::Vector2d size, const Math::AABB& aabb, double advance);
		[[nodiscard]] static std::string GetFreetypeErrorDescription(FT_Error error);
		[[nodiscard]] static std::pair<FtLibraryRecPtr, FtFaceRecPtr> InitFreetype(const std::variant<std::string, Array<char>>& source);
	};
}