/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2009 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#include "OgreConfigDialog.h"
#include "OgreException.h"
#include "OgreImage.h"
#include "OgreLogManager.h"

#include <cstdlib>
#include <iostream>

#include <string>

#include <X11/X.h>
#include <X11/Xutil.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xaw/Command.h>
#include <X11/Xaw/Form.h>
#include <X11/Xaw/Box.h>
#include <X11/Shell.h>
#include <X11/Xaw/Toggle.h>
#include <X11/Xaw/MenuButton.h>
#include <X11/Xaw/SimpleMenu.h>
#include <X11/Xaw/SmeBSB.h>

#include <list>

namespace {
/**
Backdrop image. This must be sized mWidth by mHeight, and produce a
RGB pixel format when loaded with Image::load .

You can easily generate your own backdrop with the following python script:

#!/usr/bin/python
import sys
pngstring=open(sys.argv[2], "rb").read()
print "char %s[%i]={%s};" % (sys.argv[1],len(pngstring), ",".join([str(ord(x)) for x in pngstring]))

Call this with
$ bintoheader.py GLX_backdrop GLX_backdrop.png > GLX_backdrop.h

*/
#include "GLX_backdrop.h"

};

namespace Ogre {

/**
 * Single X window with image backdrop, making it possible to configure
 * OGRE in a graphical way.
 * XaW uses a not-very-smart widget positioning system, so I override it to use
 * fixed positions. This works great, but it means you need to define the various
 * positions manually.
 * Furthermore, it has no OptionMenu by default, so I simulate this with dropdown
 * buttons.
 */
class GLXConfigurator {
	/* GUI constants */
	static const int wWidth = 400;		// Width of window
	static const int wHeight = 320;		// Height of window
	static const int col1x = 20;		// Starting x of column 1 (labels)
	static const int col2x = 180;		// Starting x of column 2 (options)
	static const int col1w = 150;		// Width of column 1 (labels)
	static const int col2w = 200;		// Width of column 2 (options)
	static const int ystart = 105;		// Starting y of option table rows
	static const int rowh = 20;		// Height of one row in the option table

public:
	GLXConfigurator();
	virtual ~GLXConfigurator();

	bool CreateWindow();
	void Main();
	/**
	 * Exit from main loop.
	 */
	void Exit();
protected:
	Display *mDisplay;
	Window mWindow;
	Pixmap mBackDrop;

	int mWidth, mHeight;
	// Xt
	XtAppContext appContext;
	Widget toplevel;

	/**
	 * Create backdrop image, and return it as a Pixmap.
	 */
	virtual Pixmap CreateBackdrop(Window rootWindow, int depth);
	/**
	 * Called after window initialisation.
	 */
	virtual bool Init();
	/**
	 * Called initially, and on expose.
	 */
	virtual void Draw();
public:
	/* Local */
	bool accept;
	/* Class that binds a callback to a RenderSystem */
	class RendererCallbackData {
	public:
		RendererCallbackData(GLXConfigurator *parent, RenderSystem *renderer, Widget optionmenu):
			parent(parent),
			renderer(renderer),
			optionmenu(optionmenu) {
		}
		GLXConfigurator *parent;
		RenderSystem *renderer;
		Widget optionmenu;
	};
	std::list<RendererCallbackData> mRendererCallbackData;

	RenderSystem *mRenderer;
	Widget box; 				// Box'o control widgets
	std::list<Widget> mRenderOptionWidgets; // List of RenderSystem specific
						// widgets for visibility management (cleared when another rendersystem is selected)
	/* Class that binds a callback to a certain configuration option/value */
	class ConfigCallbackData {
	public:
		ConfigCallbackData(GLXConfigurator *parent, const std::string &optionName, const std::string &valueName, Widget optionmenu):
			parent(parent),
			optionName(optionName),
			valueName(valueName),
			optionmenu(optionmenu) {
		}
		GLXConfigurator *parent;
		std::string optionName, valueName;
		Widget optionmenu;
	};
	std::list<ConfigCallbackData> mConfigCallbackData;

	void SetRenderSystem(RenderSystem *sys) {
		mRenderer = sys;
	}
private:
	/* Callbacks that terminate modal dialog loop */
	static void acceptHandler(Widget w, GLXConfigurator *obj, XtPointer callData) {
		// Check if a renderer was selected, if not, don't accept
		if(!obj->mRenderer)
			return;
		obj->accept = true;
		obj->Exit();
	}
	static void cancelHandler(Widget w, GLXConfigurator *obj, XtPointer callData) {
		obj->Exit();
	}
	/* Callbacks that set a setting */
	static void renderSystemHandler(Widget w, RendererCallbackData *cdata, XtPointer callData) {
		// Set selected renderer its name
		XtVaSetValues(cdata->optionmenu, XtNlabel, cdata->renderer->getName().c_str(), 0, NULL);
		// Notify Configurator (and Ogre)
		cdata->parent->SetRenderer(cdata->renderer);
	}
	static void configOptionHandler(Widget w, ConfigCallbackData *cdata, XtPointer callData) {
		// Set selected renderer its name
		XtVaSetValues(cdata->optionmenu, XtNlabel, cdata->valueName.c_str(), 0, NULL);
		// Notify Configurator (and Ogre)
		cdata->parent->SetConfigOption(cdata->optionName, cdata->valueName);
	}

	/* Functions reacting to GUI */
	void SetRenderer(RenderSystem *);
	void SetConfigOption(const std::string &optionName, const std::string &valueName);
};

GLXConfigurator::GLXConfigurator():
	mDisplay(0), mWindow(0), mBackDrop(0),
	mWidth(wWidth), mHeight(wHeight),
	appContext(0), toplevel(0),

	accept(false),
	mRenderer(0) {
}
GLXConfigurator::~GLXConfigurator() {
	if(mBackDrop)
		XFreePixmap(mDisplay, mBackDrop);
	if(toplevel) {
		XtUnrealizeWidget(toplevel);
		XtDestroyWidget(toplevel);
	}
	if(mDisplay) {
		XCloseDisplay(mDisplay);
	}
}

bool GLXConfigurator::CreateWindow() {


	const char *bla[] = {"Rendering Settings", "-bg", "honeydew3", "-fg", "black","-bd","darkseagreen4"};
	int argc = sizeof(bla)/sizeof(*bla);

	toplevel = XtVaOpenApplication(&appContext, "OGRE", NULL, 0, &argc, const_cast<char**>(bla), NULL,sessionShellWidgetClass,
		XtNwidth, mWidth,
		XtNheight, mHeight,
		XtNminWidth, mWidth,
		XtNmaxWidth, mWidth,
		XtNminHeight, mHeight,
		XtNmaxHeight, mHeight,
		XtNallowShellResize, False,
		XtNborderWidth, 0,
		XtNoverrideRedirect, False,
		NULL, NULL);

	/* Find out display and screen used */
	mDisplay = XtDisplay(toplevel);
	int screen = DefaultScreen(mDisplay);
	Window rootWindow = RootWindow(mDisplay,screen);

	/* Move to center of display */
	int w = DisplayWidth(mDisplay, screen);
	int h = DisplayHeight(mDisplay, screen);
	XtVaSetValues(toplevel,
			XtNx, w/2-mWidth/2,
			XtNy, h/2-mHeight/2, 0, NULL);

	/* Backdrop stuff */
	mBackDrop = CreateBackdrop(rootWindow, DefaultDepth(mDisplay,screen));

	/* Create toplevel */
	box = XtVaCreateManagedWidget("box",formWidgetClass,toplevel,
		XtNbackgroundPixmap, mBackDrop,
		0,NULL);

	/* Create renderer selection */
	int cury = ystart + 0*rowh;

	Widget lb1 = XtVaCreateManagedWidget("topLabel", labelWidgetClass, box, XtNlabel, "Select Renderer", XtNborderWidth, 0,
		XtNwidth, col1w, 	// Fixed width
		XtNheight, 18,
		XtNleft, XawChainLeft,
		XtNtop, XawChainTop,
		XtNright, XawChainLeft,
		XtNbottom, XawChainTop,
		XtNhorizDistance, col1x,
		XtNvertDistance, cury,
		XtNjustify, XtJustifyLeft,
		NULL);
	const char *curRenderName = " Select One "; // Name of current renderer, or hint to select one
	if(mRenderer)
		curRenderName = mRenderer->getName().c_str();
	Widget mb1 = XtVaCreateManagedWidget("Menu", menuButtonWidgetClass, box, XtNlabel,curRenderName,
		XtNresize, false,
		XtNresizable, false,
		XtNwidth, col2w, 	// Fixed width
		XtNheight, 18,
		XtNleft, XawChainLeft,
		XtNtop, XawChainTop,
		XtNright, XawChainLeft,
		XtNbottom, XawChainTop,
		XtNhorizDistance, col2x,
		XtNvertDistance, cury,
		NULL);

	Widget menu = XtVaCreatePopupShell("menu", simpleMenuWidgetClass, mb1,
		0, NULL);

	const RenderSystemList& renderers = Root::getSingleton().getAvailableRenderers();
	for (RenderSystemList::const_iterator pRend = renderers.begin();
	                pRend != renderers.end(); pRend++) {
		// Create callback data
		mRendererCallbackData.push_back(RendererCallbackData(this, *pRend, mb1));

		Widget entry = XtVaCreateManagedWidget("menuentry", smeBSBObjectClass, menu,
			XtNlabel, (*pRend)->getName().c_str(),
			0, NULL);
		XtAddCallback(entry, XtNcallback, (XtCallbackProc)&GLXConfigurator::renderSystemHandler, &mRendererCallbackData.back());
	}

	Widget bottomPanel = XtVaCreateManagedWidget("bottomPanel", formWidgetClass, box,
		XtNsensitive, True,
		XtNborderWidth, 0,
		XtNwidth, 150, 	// Fixed width
		XtNleft, XawChainLeft,
		XtNtop, XawChainTop,
		XtNright, XawChainLeft,
		XtNbottom, XawChainTop,
		XtNhorizDistance, mWidth - 160,
		XtNvertDistance, mHeight - 40,
		NULL);

	Widget helloButton = XtVaCreateManagedWidget("cancelButton", commandWidgetClass, bottomPanel, XtNlabel," Cancel ", NULL);
	XtAddCallback(helloButton, XtNcallback, (XtCallbackProc)&GLXConfigurator::cancelHandler, this);

	Widget exitButton = XtVaCreateManagedWidget("acceptButton", commandWidgetClass, bottomPanel, XtNlabel," Accept ", XtNfromHoriz,helloButton, NULL);
 	XtAddCallback(exitButton, XtNcallback, (XtCallbackProc)&GLXConfigurator::acceptHandler, this);

	XtRealizeWidget(toplevel);

	if(mRenderer)
		/* There was already a renderer selected; display its options */
		SetRenderer(mRenderer);

	return true;
}

Pixmap GLXConfigurator::CreateBackdrop(Window rootWindow, int depth) {
	int bpl;
	/* Find out number of bytes per pixel */
	switch(depth) {
	default:
		LogManager::getSingleton().logMessage("GLX backdrop: Unsupported bit depth");
		/* Unsupported bit depth */
		return 0;
	case 15:
	case 16:
		bpl = 2; break;
	case 24:
	case 32:
		bpl = 4; break;
	}
	/* Create background pixmap */
	unsigned char *data = 0; // Must be allocated with malloc

	try {
        String imgType = "png";
        Image img;
        MemoryDataStream *imgStream;
        DataStreamPtr imgStreamPtr;

        // Load backdrop image using OGRE
        imgStream = new MemoryDataStream((void*)GLX_backdrop_data, sizeof(GLX_backdrop_data), false);
        imgStreamPtr = DataStreamPtr(imgStream);
		img.load(imgStreamPtr, imgType);

        PixelBox src = img.getPixelBox(0, 0);

		// Convert and copy image
		data = (unsigned char*)malloc(mWidth * mHeight * bpl); // Must be allocated with malloc

        PixelBox dst(src, bpl == 2 ? PF_B5G6R5 : PF_A8R8G8B8, data );

        PixelUtil::bulkPixelConversion(src, dst);
	} catch(Exception &e) {
		// Could not find image; never mind
		LogManager::getSingleton().logMessage("WARNING: Can not load backdrop for config dialog. " + e.getDescription(), LML_TRIVIAL);
		return 0;
	}

	GC context = XCreateGC (mDisplay, rootWindow, 0, NULL);

	/* put my pixmap data into the client side X image data structure */
	XImage *image = XCreateImage (mDisplay, NULL, depth, ZPixmap, 0,
		(char*)data,
		mWidth, mHeight, 8,
		mWidth*bpl);
#if OGRE_ENDIAN == OGRE_ENDIAN_BIG
	image->byte_order = MSBFirst;
#else
    image->byte_order = LSBFirst;
#endif

	/* tell server to start managing my pixmap */
	Pixmap rv = XCreatePixmap(mDisplay, rootWindow, mWidth,
		mHeight, depth);

	/* copy from client to server */
	XPutImage(mDisplay, rv, context, image, 0, 0, 0, 0,
	 	mWidth, mHeight);

	/* free up the client side pixmap data area */
	XDestroyImage(image); // also cleans data
	XFreeGC(mDisplay, context);

	return rv;
}
bool GLXConfigurator::Init() {
	// Init misc resources
	return true;
}
void GLXConfigurator::Draw() {
}
void GLXConfigurator::Main() {
	XtAppMainLoop(appContext);
}
void GLXConfigurator::Exit() {
	XtAppSetExitFlag(appContext);
}

void GLXConfigurator::SetRenderer(RenderSystem *r) {
	mRenderer = r;

	// Destroy each widget of GUI of previously selected renderer
	for(std::list<Widget>::iterator i=mRenderOptionWidgets.begin(); i!=mRenderOptionWidgets.end(); i++)
		XtDestroyWidget(*i);
	mRenderOptionWidgets.clear();
	mConfigCallbackData.back();

	// Create option GUI
	int cury = ystart + 1*rowh + 10;

	ConfigOptionMap options = mRenderer->getConfigOptions();
	// Process each option and create an optionmenu widget for it
	for (ConfigOptionMap::iterator it = options.begin();
					it != options.end(); it++) {
		// if the config option does not have any possible value, then skip it.
		// if we create a popup with zero entries, it will crash when you click
		// on it.
		if (it->second.possibleValues.empty())
			continue;

		Widget lb1 = XtVaCreateManagedWidget("topLabel", labelWidgetClass, box, XtNlabel, it->second.name.c_str(), XtNborderWidth, 0,
			XtNwidth, col1w, 	// Fixed width
			XtNheight, 18,
			XtNleft, XawChainLeft,
			XtNtop, XawChainTop,
			XtNright, XawChainLeft,
			XtNbottom, XawChainTop,
			XtNhorizDistance, col1x,
			XtNvertDistance, cury,
			XtNjustify, XtJustifyLeft,
			NULL);
		mRenderOptionWidgets.push_back(lb1);
		Widget mb1 = XtVaCreateManagedWidget("Menu", menuButtonWidgetClass, box, XtNlabel, it->second.currentValue.c_str(),
			XtNresize, false,
			XtNresizable, false,
			XtNwidth, col2w, 	// Fixed width
			XtNheight, 18,
			XtNleft, XawChainLeft,
			XtNtop, XawChainTop,
			XtNright, XawChainLeft,
			XtNbottom, XawChainTop,
			XtNhorizDistance, col2x,
			XtNvertDistance, cury,
			NULL);
		mRenderOptionWidgets.push_back(mb1);

		Widget menu = XtVaCreatePopupShell("menu", simpleMenuWidgetClass, mb1,
			0, NULL);

		// Process each choice
		StringVector::iterator opt_it;
		for (opt_it = it->second.possibleValues.begin();
		                opt_it != it->second.possibleValues.end(); opt_it++) {
			// Create callback data
			mConfigCallbackData.push_back(ConfigCallbackData(this, it->second.name, *opt_it, mb1));

			Widget entry = XtVaCreateManagedWidget("menuentry", smeBSBObjectClass, menu,
				XtNlabel, (*opt_it).c_str(),
				0, NULL);
			XtAddCallback(entry, XtNcallback, (XtCallbackProc)&GLXConfigurator::configOptionHandler, &mConfigCallbackData.back());
		}
		cury += rowh;
	}
}

void GLXConfigurator::SetConfigOption(const std::string &optionName, const std::string &valueName) {
	if(!mRenderer)
		// No renderer set -- how can this be called?
		return;
	mRenderer->setConfigOption(optionName, valueName);
	SetRenderer(mRenderer);
}

//------------------------------------------------------------------------------------//
ConfigDialog::ConfigDialog() : mSelectedRenderSystem(0)
{
}

//------------------------------------------------------------------------------------//
bool ConfigDialog::display()
{
	GLXConfigurator test;
	/* Select previously selected rendersystem */
	if(Root::getSingleton().getRenderSystem())
		test.SetRenderSystem(Root::getSingleton().getRenderSystem());
	/* Attempt to create the window */
	if(!test.CreateWindow())
		OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, "Could not create configuration dialog",
		       "GLXConfig::display");

	// Modal loop
	test.Main();
	if(!test.accept) // User did not accept
		return false;

	/* All done */
	Root::getSingleton().setRenderSystem(test.mRenderer);

	return true;
}
};