/*
 * 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 "Math/AABB.hpp"
#include "Extensions/FreetypeHelper.hpp"

namespace OpenVulkano::Scene
{
	class GlyphInfo;

	class FontAtlasGeneratorBase : public IFontAtlasGenerator
	{
	protected:
		int m_channelsCount;
		std::shared_ptr<FontAtlas> m_atlasData;

	public:
		FontAtlasGeneratorBase(const int channelsCount) : m_channelsCount(channelsCount) {}

		[[nodiscard]] const std::shared_ptr<FontAtlas>& GetAtlas() const final { return m_atlasData; }

		[[nodiscard]] int GetAtlasChannelsCount() const { return m_channelsCount; }

		static size_t LoadAllGlyphs(std::set<uint32_t>& chars, const std::span<const uint8_t>& fontData) { auto [lib, face] = InitFreetype(fontData); return LoadAllGlyphs(chars, face); }

		static size_t LoadAllGlyphs(std::set<uint32_t>& chars, const FtFaceRecPtr& face);

	protected:
		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::span<const uint8_t>& data);
	};
}