/*
 * 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/.
 */

#include "Shelf.hpp"
#include "Extensions/FreetypeHelper.hpp"

namespace OpenVulkano::Scene
{
	std::vector<Shelf> Shelf::CreateShelves(uint32_t atlasWidth, std::vector<GlyphForPacking>& glyphs,
											FT_FaceRec_* face, int channelsCount)
	{
		std::vector<Shelf> shelves;
		for (GlyphForPacking& glyph : glyphs)
		{
			FT_Error error = FT_Load_Char(face, glyph.code, FT_LOAD_RENDER);
			if (error) continue;

			bool needNewShelf = true;
			uint32_t totalPrevShelvesHeight = 0;
			for (Shelf& shelf : shelves)
			{
				if (std::optional<std::pair<uint32_t, uint32_t>> opt = shelf.AddGlyph(glyph.size.x, glyph.size.y))
				{
					glyph.firstGlyphByteInAtlas = opt->second;
					glyph.atlasPos.x = opt->first;
					glyph.atlasPos.y = totalPrevShelvesHeight;
					needNewShelf = false;
					break;
				}
				totalPrevShelvesHeight += shelf.GetHeight();
			}

			if (needNewShelf)
			{
				shelves.emplace_back(atlasWidth, glyph.size.y, channelsCount, totalPrevShelvesHeight);
				Shelf& shelf = shelves.back();
				uint32_t firstByte = (*shelf.AddGlyph(glyph.size.x, glyph.size.y)).second;
				glyph.firstGlyphByteInAtlas = firstByte;
				glyph.atlasPos.x = 0;
				glyph.atlasPos.y = totalPrevShelvesHeight;
			}
		}
		return shelves;
	}
}