#include <cassert>
#include "opengl/OpenGlDef.h"
#include "GSH_OpenGLAndroid.h"
#include "AppConfig.h"

CGSH_OpenGLAndroid::CGSH_OpenGLAndroid(NativeWindowType window)
    : m_window(window)
{
	//We'll probably need to keep 'window' as a Global JNI object
}

CGSH_OpenGLAndroid::~CGSH_OpenGLAndroid()
{
}

CGSHandler::FactoryFunction CGSH_OpenGLAndroid::GetFactoryFunction(NativeWindowType window)
{
	return [window]() { return new CGSH_OpenGLAndroid(window); };
}

void CGSH_OpenGLAndroid::InitializeImpl()
{
	static const EGLint configAttribs[] =
	    {
	        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
	        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
	        EGL_BLUE_SIZE, 8,
	        EGL_GREEN_SIZE, 8,
	        EGL_RED_SIZE, 8,
	        EGL_NONE};

	static const EGLint contextAttribs[] =
	    {
	        EGL_CONTEXT_CLIENT_VERSION, 3,
	        EGL_NONE};

	m_display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
	eglInitialize(m_display, 0, 0);

	EGLint numConfigs = 0;
	eglChooseConfig(m_display, configAttribs, &m_config, 1, &numConfigs);
	assert(numConfigs > 0);

	m_context = eglCreateContext(m_display, m_config, NULL, contextAttribs);
	assert(m_context != EGL_NO_CONTEXT);

	SetupContext();

	CGSH_OpenGL::InitializeImpl();
}

void CGSH_OpenGLAndroid::PresentBackbuffer()
{
	eglSwapBuffers(m_display, m_surface);
}

void CGSH_OpenGLAndroid::SetWindow(NativeWindowType window)
{
	m_window = window;
	SendGSCall(
	    [this]() {
		    SetupContext();
	    },
	    true);
}

void CGSH_OpenGLAndroid::SetupContext()
{
	if(m_surface != EGL_NO_SURFACE)
	{
		eglDestroySurface(m_display, m_surface);
		m_surface = EGL_NO_SURFACE;
	}

	m_surface = eglCreateWindowSurface(m_display, m_config, m_window, NULL);
	assert(m_surface != EGL_NO_SURFACE);

	auto makeCurrentResult = eglMakeCurrent(m_display, m_surface, m_surface, m_context);
	assert(makeCurrentResult != EGL_FALSE);

	{
		GLint w = 0, h = 0;
		eglQuerySurface(m_display, m_surface, EGL_WIDTH, &w);
		eglQuerySurface(m_display, m_surface, EGL_HEIGHT, &h);

		PRESENTATION_PARAMS presentationParams;
		presentationParams.mode = static_cast<CGSHandler::PRESENTATION_MODE>(CAppConfig::GetInstance().GetPreferenceInteger(PREF_CGSHANDLER_PRESENTATION_MODE));
		presentationParams.windowWidth = w;
		presentationParams.windowHeight = h;

		SetPresentationParams(presentationParams);
	}

	eglSwapInterval(m_display, 0);
}