/*
	Tool for creating Irrlicht bitmap+vector fonts, 
	started by Gaz Davidson in December 2006

	Due to my laziness and Microsoft's unituitive API, surragate pairs and 
	nonspacing diacritical marks are not supported!

*/


#include <irrlicht.h>
#include <iostream>

#include "CFontTool.h"
#include "CVectorFontTool.h"
#include "ITexture.h"

using namespace irr;
using namespace gui;

#pragma comment(lib, "Irrlicht.lib")

const s32 texturesizes[] = {128, 256, 512, 1024, 2048, 4096, 0};

const wchar_t *fileformats[]		 =  { L"bmp", L"ppm", 0 };  // bitmap font formats
const wchar_t *alphafileformats[]  =  { L"png", L"tga", 0 };  // bitmap font formats which support alpha channels
const wchar_t *vectorfileformats[] =  { L"xml", L"bin", 0 };  // file formats for vector fonts

const wchar_t *warntext = L"Legal Notice\n"
					L"------------\n\n"
					L"When making bitmap and vector fonts, you should consider the potential legal "
					L"issues with redistributing the fonts with your software; this tool basically "
					L"copies font data and some authors might not like this!\n"
					L"If you purchased fonts or they came with an application or your OS, you'll have"
					L"to check the license to see what restrictions are placed on making derivative works.\n\n"
					L"PD and the OFL\n"
					L"--------------\n\n"
					L"You'll find lots of fonts on the web listed as Public Domain, you can do what you like "
					L"with these.\n"
					L"Many fonts are released under the Open Font License, which is a 'viral' open source "
					L"license like the GPL. It's worth reading the license here: http://scripts.sil.org/OFL\n"
					L"The most important restrictions are- you must include the original font's license, you "
					L"can't stop your users from using or distributing the font, the font must have a "
					L"different name the original.\n\n"
					L"Some free fonts can be found here- www.openfontlibrary.org\n"
					L"http://savannah.nongnu.org/projects/freefont/";

wchar_t *helptext = L"This tool creates bitmap fonts for the Irrlicht Engine\n\n"

					L"First select a character encoding from the list, then choose the font, "
					L"size, and whether you'd like bold, italic, antialiasing and an alpha channel. "
					L"In Windows, antialiasing will be ignored for small fonts\n\n"

					L"Then select a texture width and height. If the output exceeds this then more than "
					L"one image will be created. You can use the scrollbar at the top of the screen to "
					L"preview them. Most modern graphics cards will support up to 2048x2048, "
					L"keep in mind that more images means worse performance when drawing text!\n\n"

					L"If you want a vector font rather than a bitmap font, check the vector box. "
					L"Vector fonts are stored in system memory while bitmap fonts are in video ram\n\n"

					L"Click create to preview your font, this may take lots of time and memory "
					L"when making a font with a lot of characters, please be patient!\n\n"

					L"Now you're ready to give your font a name, select a format and click save.\n\n"
					L"To load your font in Irrlicht, simply use env->addFont(\"Myfont.xml\");\n\n"

					L"That's all, have fun :-)";

enum MYGUI
{
	MYGUI_CHARSET  = 100,	
	MYGUI_FONTNAME,
	MYGUI_SIZE,
	MYGUI_TEXWIDTH,
	MYGUI_TEXHEIGHT,
	MYGUI_BOLD,
	MYGUI_ITALIC,
	MYGUI_ANTIALIAS,
	MYGUI_ALPHA,
	MYGUI_VECTOR,
	MYGUI_FILENAME,
	MYGUI_FORMAT,
	MYGUI_CREATE,
	MYGUI_SAVE,
	MYGUI_IMAGE,
	MYGUI_CURRENTIMAGE,
	MYGUI_HELPBUTTON
};


// event reciever
class MyEventReceiver : public IEventReceiver
{
public:

	MyEventReceiver(IrrlichtDevice* device, CFontTool*& fonttool, CVectorFontTool* &vectool) : 
		Device(device), FontTool(fonttool), VecTool(vectool)
	{
		device->setEventReceiver(this);
	}

	virtual bool OnEvent(SEvent event)
	{
		if (event.EventType == EET_GUI_EVENT)
		{
			s32 id = event.GUIEvent.Caller->getID();
			IGUIEnvironment* env = Device->getGUIEnvironment();

			switch(event.GUIEvent.EventType)
			{
			case EGET_SCROLL_BAR_CHANGED:
				if (id == MYGUI_CURRENTIMAGE)
				{
					IGUIImage* img = (IGUIImage*)env->getRootGUIElement()->getElementFromId(MYGUI_IMAGE,true);
					s32 i = ((IGUIScrollBar*)event.GUIEvent.Caller)->getPos();
					img->setImage(FontTool->currentTextures[i]);

					return true;
				}
				break;
			case EGET_COMBO_BOX_CHANGED:
				if (id == MYGUI_CHARSET)
				{
					IGUIComboBox* cbo = (IGUIComboBox*)event.GUIEvent.Caller;
					FontTool->selectCharSet(cbo->getSelected());
					// rebuild font list
					cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_FONTNAME,true);
					cbo->clear();
					for (u32 i=0; i < FontTool->FontNames.size(); ++i)
						cbo->addItem(FontTool->FontNames[i].c_str());
					return true;
				}
				break;
			case EGET_CHECKBOX_CHANGED:
				if (id == MYGUI_VECTOR)
				{
					IGUICheckBox* chk = (IGUICheckBox*)event.GUIEvent.Caller;

					IGUIComboBox *cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_FORMAT,true);
					cbo->clear();

					if (chk->isChecked() && VecTool)
					{
						// vector formats
						for (s32 i=0; fileformats[i] != 0; ++i)
							cbo->addItem( core::stringw(vectorfileformats[i]).c_str());	

					}
					else
					{

						// bitmap formats
						if (!FontTool->UseAlphaChannel)
						{
							// add non-alpha formats
							for (s32 i=0; fileformats[i] != 0; ++i)
								cbo->addItem( core::stringw(fileformats[i]).c_str());	
						}
						// add formats which support alpha
						for (s32 i=0; alphafileformats[i] != 0; ++i)
							cbo->addItem( core::stringw(alphafileformats[i]).c_str());
					}
					
				}
				break;

			case EGET_BUTTON_CLICKED:

				if (id == MYGUI_CREATE)
				{
					// create the font with the params
					IGUIComboBox* cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_CHARSET, true);
					int charset = cbo->getSelected();
					
					cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_FONTNAME,true);
					int fontname = cbo->getSelected();

					cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_SIZE,true);
					int fontsize = cbo->getSelected();

					cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_TEXWIDTH,true);
					int texwidth = cbo->getSelected();

					cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_TEXHEIGHT,true);
					int texheight = cbo->getSelected();

					IGUICheckBox* chk = (IGUICheckBox*)env->getRootGUIElement()->getElementFromId(MYGUI_BOLD,true);
					bool bold = chk->isChecked();
					chk = (IGUICheckBox*)env->getRootGUIElement()->getElementFromId(MYGUI_ITALIC,true);
					bool italic = chk->isChecked();

					chk = (IGUICheckBox*)env->getRootGUIElement()->getElementFromId(MYGUI_ALPHA,true);
					bool alpha = chk->isChecked();

					chk = (IGUICheckBox*)env->getRootGUIElement()->getElementFromId(MYGUI_ANTIALIAS,true);
					bool aa = chk->isChecked();

					chk = (IGUICheckBox*)env->getRootGUIElement()->getElementFromId(MYGUI_VECTOR,true);
					bool vec = chk->isChecked();

					FontTool->makeBitmapFont(fontname, charset, FontTool->FontSizes[fontsize], texturesizes[texwidth], texturesizes[texheight], bold, italic, aa, alpha); 

					IGUIScrollBar* scrl = (IGUIScrollBar*)env->getRootGUIElement()->getElementFromId(MYGUI_CURRENTIMAGE,true);
					scrl->setMax(FontTool->currentTextures.size() == 0 ? 0 : FontTool->currentTextures.size()-1);

					if (FontTool->currentTextures.size() > 0)
					{
						IGUIImage* img = (IGUIImage*)env->getRootGUIElement()->getElementFromId(MYGUI_IMAGE,true);
						img->setImage(FontTool->currentTextures[0]);
						scrl->setPos(0);
					}

					// make sure users pick a file format that supports alpha channel
					cbo = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_FORMAT,true);
					cbo->clear();
					
					if (vec)
					{
						// add vector formats
						for (s32 i=0; fileformats[i] != 0; ++i)
							cbo->addItem( core::stringw(vectorfileformats[i]).c_str());	
					}
					else
					{
						if (!alpha)
						{
							// add non-alpha formats
							for (s32 i=0; fileformats[i] != 0; ++i)
								cbo->addItem( core::stringw(fileformats[i]).c_str());	
						}
						// add formats which support alpha
						for (s32 i=0; alphafileformats[i] != 0; ++i)
							cbo->addItem( core::stringw(alphafileformats[i]).c_str());
					}
					if (VecTool)
					{
						delete VecTool;
						VecTool = 0;
					}
					if (vec)
					{
						VecTool = new CVectorFontTool(FontTool);
					}

					return true;
				}

				if (id == MYGUI_SAVE)
				{
					IGUIEditBox *edt  = (IGUIEditBox*)env->getRootGUIElement()->getElementFromId(MYGUI_FILENAME,true);
					core::stringc name = edt->getText();

					IGUIComboBox *fmt  = (IGUIComboBox*)env->getRootGUIElement()->getElementFromId(MYGUI_FORMAT,true);
					core::stringc format = fmt->getItem(fmt->getSelected());

					IGUICheckBox *chk = (IGUICheckBox*)env->getRootGUIElement()->getElementFromId(MYGUI_VECTOR,true);
					bool vec = chk->isChecked();

					if (vec && VecTool)
						VecTool->saveVectorFont(name.c_str(), format.c_str());
					else
						FontTool->saveBitmapFont(name.c_str(), format.c_str());
					
					return true;
				}

				if (id == MYGUI_HELPBUTTON)
				{
					env->addMessageBox(L"Irrlicht Unicode Font Tool", helptext);
					return true;
				}

				break;
			}
		}

		return false;
	}

	IrrlichtDevice*	 Device;
	CFontTool*       FontTool;
	CVectorFontTool* VecTool;

};

void createGUI(IrrlichtDevice* device, CFontTool* fc)
{
	gui::IGUIEnvironment *env = device->getGUIEnvironment();

	// change transparency of skin
	for (s32 i=0; i<gui::EGDC_COUNT ; ++i)
	{
		video::SColor col = env->getSkin()->getColor((gui::EGUI_DEFAULT_COLOR)i);
		col.setAlpha(255);
		env->getSkin()->setColor((gui::EGUI_DEFAULT_COLOR)i, col);
	}

	IGUIWindow *win = env->addWindow( core::rect<s32>(10,10,200,500), false, L"Font Creator");
	win->getCloseButton()->setVisible(false);

	s32 xs=10,xp=xs, yp=30, h=20;

	env->addStaticText(L"Charset", core::rect<s32>(xp,yp,50,yp+h),false,false, win);

	xp+=60;

	// charset combo
	gui::IGUIComboBox* cbo = env->addComboBox( core::rect<s32>(xp,yp,180,yp+h),win, MYGUI_CHARSET);
	for (u32 i=0; i < fc->CharSets.size(); ++i)
		cbo->addItem(fc->CharSets[i].c_str());

	yp += (s32)(h*1.5f);
	xp = xs;

	env->addStaticText(L"Font", core::rect<s32>(xp,yp,50,yp+h),false,false, win);

	xp+=60;

	// font name combo
	cbo = env->addComboBox( core::rect<s32>(xp,yp,180,yp+h),win, MYGUI_FONTNAME);
	for (u32 i=0; i < fc->FontNames.size(); ++i)
		cbo->addItem(fc->FontNames[i].c_str());

	yp += (s32)(h*1.5f);
	xp = xs;

	env->addStaticText(L"Size", core::rect<s32>(xp,yp,50,yp+h),false,false, win);

	xp += 60;

	// font size combo
	cbo = env->addComboBox( core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_SIZE);
	for (s32 i=0; fc->FontSizes[i] != 0; ++i)
		cbo->addItem( ((core::stringw(fc->FontSizes[i])) + L"px").c_str());

	xp = xs;
	yp += (s32)(h*1.5f);

	// bold checkbox
	env->addCheckBox(false, core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_BOLD, L"Bold"); 

	xp += 45;

	// italic checkbox
	env->addCheckBox(false, core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_ITALIC, L"Italic");

	xp += 45;

	// AA checkbox
	env->addCheckBox(false, core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_ANTIALIAS, L"AA");

	xp +=40;

	// Alpha checkbox
	env->addCheckBox(false, core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_ALPHA, L"Alpha");

	xp = xs;
	yp += (s32)(h*1.5f);

	env->addCheckBox(false, core::rect<s32>(xp,yp,xp+200,yp+h),win, MYGUI_VECTOR, L"Vector Font");

	yp += (s32)(h*1.5f);

	env->addStaticText(L"Max Width:", core::rect<s32>(xp,yp,50,yp+h),false,false, win);

	xp += 60;

	// texture widths
	cbo = env->addComboBox( core::rect<s32>(xp,yp,xp+70,yp+h),win, MYGUI_TEXWIDTH);
	for (s32 i=0; texturesizes[i] != 0; ++i)
		cbo->addItem( ((core::stringw(texturesizes[i])) + L" wide").c_str());

	xp=xs;
	yp += (s32)(h*1.5f);

	env->addStaticText(L"Max Height:", core::rect<s32>(xp,yp,60,yp+h),false,false, win);
	
	xp += 60;

	// texture height
	cbo = env->addComboBox( core::rect<s32>(xp,yp,xp+70,yp+h),win, MYGUI_TEXHEIGHT);
	for (s32 i=0; texturesizes[i] != 0; ++i)
		cbo->addItem( ((core::stringw(texturesizes[i])) + L" tall").c_str());

	// file name
	xp = xs;
	yp += (s32)(h*1.5f);
	env->addStaticText(L"Filename", core::rect<s32>(xp,yp,60,yp+h),false,false, win);
	xp += 60;
	env->addEditBox(L"myfont",core::rect<s32>(xp,yp,xp+70,yp+h), true, win, MYGUI_FILENAME);

	// file format
	xp = xs;
	yp += (s32)(h*1.5f);
	env->addStaticText(L"File Format", core::rect<s32>(xp,yp,60,yp+h),false,false, win);
	xp += 60;

	cbo = env->addComboBox( core::rect<s32>(xp,yp,xp+70,yp+h),win, MYGUI_FORMAT);
	for (s32 i=0; fileformats[i] != 0; ++i)
		cbo->addItem( core::stringw(fileformats[i]).c_str());
	for (s32 i=0; alphafileformats[i] != 0; ++i)
		cbo->addItem( core::stringw(alphafileformats[i]).c_str());

	xp = xs;
	yp += h*2;

	// create button
	env->addButton( core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_CREATE, L"Create");

	xp += 60;

	// save button
	env->addButton( core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_SAVE, L"Save");

	xp += 60;

	// help button
	env->addButton( core::rect<s32>(xp,yp,xp+50,yp+h),win, MYGUI_HELPBUTTON, L"Help");

	// font image
	gui::IGUIImage *img = env->addImage(0, core::position2d<s32>(0,0), true,0, MYGUI_IMAGE);
	img->setRelativePosition(core::rect<s32>(0,20,800,600));

	// font scrollbar
	IGUIScrollBar *scrl= env->addScrollBar(true,core::rect<s32>(0,0,800,20),0, MYGUI_CURRENTIMAGE);
	scrl->setMax(0);
	scrl->setSmallStep(1);

	yp += h*3;

	env->getRootGUIElement()->bringToFront(win);
	win->setRelativePosition( core::rect<s32>(10,10,200,yp));
}

int main()
{
	IrrlichtDevice* device =createDevice(video::EDT_OPENGL, core::dimension2d<s32>(800, 600));
	video::IVideoDriver* driver = device->getVideoDriver();
	scene::ISceneManager* smgr = device->getSceneManager();
	gui::IGUIEnvironment *env = device->getGUIEnvironment();

	// create font tool
	CFontTool *fc = new CFontTool(device);
	CVectorFontTool *vc = 0;

	IEventReceiver *events = new MyEventReceiver(device,fc,vc);

	createGUI(device, fc);

	while(device->run()) 
	{
		if (device->isWindowActive())
		{
			
			driver->beginScene(true, true, video::SColor(0,200,200,200));
			smgr->drawAll();
			env->drawAll();
			driver->endScene();
		}
	}

	device->drop();

	// drop the font tool and resources
	fc->drop();
	
	return 0;
}

