/*
 * 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 "UiFont.hpp"
#include <Base/Logger.hpp>
#include "Host/FontResolver.hpp"
#include <map>
#include <imgui.h>

namespace OpenVulkano::Scene::UI
{
	void UiFont::SetActive()
	{
		if (!m_font) MakeFont();
		if (m_font) ImGui::PushFont(m_font);
	}

	void UiFont::MakeFont()
	{
		if (m_pixelSize <= 0 || m_font) return;
		auto fontData = FontResolver::GetFontData(m_name);
		if (!fontData)
		{
			Logger::APP->warn("Failed to find font {}", m_name);
			m_pixelSize = 0;
			return;
		}
		ImFontConfig conf;
		if (m_name.size() >= sizeof(conf.Name))
		{
			memcpy(conf.Name, m_name.data(), sizeof(conf.Name) - 1);
			conf.Name[sizeof(conf.Name) - 1] = '\0';
		}
		else memcpy(conf.Name, m_name.data(), m_name.size() + 1);
		conf.FontDataOwnedByAtlas = false;
		conf.RasterizerDensity = 3; // TODO check window scale factor
		ImGuiIO& io = ImGui::GetIO();
		m_font = io.Fonts->AddFontFromMemoryTTF(fontData.Data(), static_cast<int>(fontData.Size()), m_pixelSize, &conf);
	}

	UiFont* UiFont::GetFont(const std::string& fontName, int pixelSize)
	{
		static std::map<std::pair<std::string, int>, UiFont> FONTS;
		UiFont& font = FONTS[{fontName, pixelSize}];
		if (font.m_pixelSize != pixelSize) font = UiFont(fontName, (float)pixelSize);
		font.MakeFont();
		return &font;
	}
}