// Copyright (C) 2020 Jérôme Leclercq
// This file is part of the "Nazara Engine - OpenGL Renderer"
// For conditions of distribution and use, see copyright notice in Config.hpp

#include <Nazara/OpenGLRenderer/OpenGLRenderer.hpp>
#include <Nazara/Core/ErrorFlags.hpp>
#include <Nazara/Renderer/RenderDevice.hpp>
#include <Nazara/Renderer/RenderSurface.hpp>
#include <Nazara/Renderer/RenderWindowImpl.hpp>
#include <Nazara/OpenGLRenderer/DummySurface.hpp>
#include <Nazara/OpenGLRenderer/OpenGLRenderWindow.hpp>
#include <cassert>
#include <sstream>

#if defined(NAZARA_PLATFORM_WINDOWS) || defined(NAZARA_PLATFORM_LINUX)
#include <Nazara/OpenGLRenderer/Wrapper/EGL/EGLLoader.hpp>
#endif

#ifdef NAZARA_PLATFORM_WINDOWS
#include <Nazara/OpenGLRenderer/Wrapper/WGL/WGLLoader.hpp>
#endif

#include <Nazara/OpenGLRenderer/Debug.hpp>

namespace Nz
{
	OpenGLRenderer::OpenGLRenderer()
	{
		auto& dummyDevice = m_deviceInfos.emplace_back();
		dummyDevice.name = "OpenGL Default Device";
		dummyDevice.type = RenderDeviceType::Unknown;
	}

	OpenGLRenderer::~OpenGLRenderer()
	{
		m_device.reset();
		m_loader.reset();
	}

	std::unique_ptr<RenderSurface> OpenGLRenderer::CreateRenderSurfaceImpl()
	{
		return std::make_unique<DummySurface>();
	}

	std::unique_ptr<RenderWindowImpl> OpenGLRenderer::CreateRenderWindowImpl(RenderWindow& owner)
	{
		return std::make_unique<OpenGLRenderWindow>(owner);
	}

	std::shared_ptr<RenderDevice> OpenGLRenderer::InstanciateRenderDevice(std::size_t deviceIndex, const RenderDeviceFeatures& /*enabledFeatures*/)
	{
		assert(deviceIndex == 0);
		return m_device;
	}

	bool OpenGLRenderer::Prepare(const ParameterList& /*parameters*/)
	{
		std::unique_ptr<GL::Loader> loader = SelectLoader();
		if (!loader)
		{
			NazaraError("Failed to initialize OpenGL loader");
			return false;
		}

		m_loader = std::move(loader);

		m_device = std::make_shared<OpenGLDevice>(*m_loader);

		return true;
	}

	std::unique_ptr<GL::Loader> OpenGLRenderer::SelectLoader()
	{
#ifdef NAZARA_PLATFORM_WINDOWS
		try
		{
			return std::make_unique<GL::WGLLoader>();
		}
		catch (const std::exception& e)
		{
			NazaraWarning(std::string("Failed to load WGL: ") + e.what());
		}
#endif

#if defined(NAZARA_PLATFORM_WINDOWS) || defined(NAZARA_PLATFORM_LINUX)
		try
		{
			return std::make_unique<GL::EGLLoader>();
		}
		catch (const std::exception& e)
		{
			NazaraWarning(std::string("Failed to load EGL: ") + e.what());
		}
#endif

		return {};
	}

	RenderAPI OpenGLRenderer::QueryAPI() const
	{
		return RenderAPI::OpenGL;
	}

	std::string OpenGLRenderer::QueryAPIString() const
	{
		std::ostringstream ss;
		ss << "OpenGL ES renderer 3.0";

		return ss.str();
	}

	UInt32 OpenGLRenderer::QueryAPIVersion() const
	{
		return 300;
	}

	const std::vector<RenderDeviceInfo>& OpenGLRenderer::QueryRenderDevices() const
	{
		return m_deviceInfos;
	}
}