// Copyright 2014 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

#include "Core/Host.h"
#include "DolphinWX/GLInterface/GLInterface.h"
#include "VideoCommon/VideoConfig.h"

#if USE_EGL
bool cXInterface::ServerConnect(void)
{
	GLWin.dpy = XOpenDisplay(nullptr);

	if (!GLWin.dpy)
		return false;

	return true;
}

bool cXInterface::Initialize(void *config, void *window_handle)
{
	XVisualInfo visTemplate;
	int num_visuals;
	EGLint vid;

	if (!GLWin.dpy) {
		printf("Error: couldn't open X display\n");
		return false;
	}

	if (!eglGetConfigAttrib(GLWin.egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
		printf("Error: eglGetConfigAttrib() failed\n");
		exit(1);
	}

	/* The X window visual must match the EGL config */
	visTemplate.visualid = vid;
	GLWin.vi = XGetVisualInfo(GLWin.dpy, VisualIDMask, &visTemplate, &num_visuals);
	if (!GLWin.vi) {
		printf("Error: couldn't get X visual\n");
		exit(1);
	}

	GLWin.evdpy = XOpenDisplay(nullptr);
	GLWin.parent = (Window) window_handle;
	GLWin.screen = DefaultScreen(GLWin.dpy);

	if (GLWin.parent == 0)
		GLWin.parent = RootWindow(GLWin.dpy, GLWin.screen);

	return true;
}

void *cXInterface::EGLGetDisplay(void)
{
#if HAVE_WAYLAND
	return eglGetDisplay((wl_display *) GLWin.dpy);
#else
	return eglGetDisplay(GLWin.dpy);
#endif
}

void *cXInterface::CreateWindow(void)
{
	Atom wmProtocols[1];

	// Setup window attributes
	GLWin.attr.colormap = XCreateColormap(GLWin.evdpy,
			GLWin.parent, GLWin.vi->visual, AllocNone);
	GLWin.attr.event_mask = KeyPressMask | StructureNotifyMask | FocusChangeMask;
	GLWin.attr.background_pixel = BlackPixel(GLWin.evdpy, GLWin.screen);
	GLWin.attr.border_pixel = 0;

	// Create the window
	GLWin.win = XCreateWindow(GLWin.evdpy, GLWin.parent,
			0, 0, 1, 1, 0,
			GLWin.vi->depth, InputOutput, GLWin.vi->visual,
			CWBorderPixel | CWBackPixel | CWColormap | CWEventMask, &GLWin.attr);
	wmProtocols[0] = XInternAtom(GLWin.evdpy, "WM_DELETE_WINDOW", True);
	XSetWMProtocols(GLWin.evdpy, GLWin.win, wmProtocols, 1);
	XSetStandardProperties(GLWin.evdpy, GLWin.win, "GPU", "GPU", None, nullptr, 0, nullptr);
	XMapRaised(GLWin.evdpy, GLWin.win);
	XSync(GLWin.evdpy, True);

	GLWin.xEventThread = std::thread(&cXInterface::XEventThread, this);
	// Control window size and picture scaling
	GLInterface->SetBackBufferDimensions(GLWin.width, GLWin.height);

	return (void *) GLWin.win;
}

void cXInterface::DestroyWindow(void)
{
	XDestroyWindow(GLWin.evdpy, GLWin.win);
	GLWin.win = 0;
	if (GLWin.xEventThread.joinable())
		GLWin.xEventThread.join();
	XFreeColormap(GLWin.evdpy, GLWin.attr.colormap);
}

void cXInterface::UpdateFPSDisplay(const std::string& text)
{
	XStoreName(GLWin.evdpy, GLWin.win, text.c_str());
}

void cXInterface::SwapBuffers()
{
	eglSwapBuffers(GLWin.egl_dpy, GLWin.egl_surf);
}

void cXInterface::XEventThread()
#else
void cX11Window::CreateXWindow(void)
{
	Atom wmProtocols[1];

	// Setup window attributes
	GLWin.attr.colormap = XCreateColormap(GLWin.evdpy,
			GLWin.parent, GLWin.vi->visual, AllocNone);
	GLWin.attr.event_mask = KeyPressMask | StructureNotifyMask | FocusChangeMask;
	GLWin.attr.background_pixel = BlackPixel(GLWin.evdpy, GLWin.screen);
	GLWin.attr.border_pixel = 0;

	// Create the window
	GLWin.win = XCreateWindow(GLWin.evdpy, GLWin.parent,
			0, 0, 1, 1, 0,
			GLWin.vi->depth, InputOutput, GLWin.vi->visual,
			CWBorderPixel | CWBackPixel | CWColormap | CWEventMask, &GLWin.attr);
	wmProtocols[0] = XInternAtom(GLWin.evdpy, "WM_DELETE_WINDOW", True);
	XSetWMProtocols(GLWin.evdpy, GLWin.win, wmProtocols, 1);
	XSetStandardProperties(GLWin.evdpy, GLWin.win, "GPU", "GPU", None, nullptr, 0, nullptr);
	XMapRaised(GLWin.evdpy, GLWin.win);
	XSync(GLWin.evdpy, True);

	GLWin.xEventThread = std::thread(&cX11Window::XEventThread, this);
}

void cX11Window::DestroyXWindow(void)
{
	XUnmapWindow(GLWin.evdpy, GLWin.win);
	GLWin.win = 0;
	if (GLWin.xEventThread.joinable())
		GLWin.xEventThread.join();
	XFreeColormap(GLWin.evdpy, GLWin.attr.colormap);
}

void cX11Window::XEventThread()
#endif
{
	while (GLWin.win)
	{
		XEvent event;
		for (int num_events = XPending(GLWin.evdpy); num_events > 0; num_events--)
		{
			XNextEvent(GLWin.evdpy, &event);
			switch (event.type) {
				case ConfigureNotify:
					GLInterface->SetBackBufferDimensions(event.xconfigure.width, event.xconfigure.height);
					break;
				case ClientMessage:
					if ((unsigned long) event.xclient.data.l[0] ==
							XInternAtom(GLWin.evdpy, "WM_DELETE_WINDOW", False))
						Host_Message(WM_USER_STOP);
					break;
				default:
					break;
			}
		}
		Common::SleepCurrentThread(20);
	}
}