/* libsegl - Sebas Extended GL Library
 *           Collection of Opengl/3D-Math helpers
 *
 *      Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
 *      http://www.seba-geek.de
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#include "glfontengine.h"

namespace segl {

bool GLFontEngine::addFont(std::string fontfile, std::string fontname) {
	GLFont *tmp = new GLFont(fontfile, 0.685f);
	if(!tmp->font->isLoaded()) {
		delete(tmp);
		std::cerr << fontfile << " konnte als Font nicht geladen werden" << std::endl;
		return false;
	}
	
	fontpool[fontname] = tmp;
	return true;
}

void GLFontEngine::quit() {
	for(std::map<std::string, GLFont*>::iterator iter = fontpool.begin(); iter != fontpool.end(); iter++) {
		delete(iter->second); // unloaded texture.. der dtor
		fontpool.erase(iter);
	}
}

void GLFontEngine::prepare2DbyPushingMatrix() {
	const SDL_Surface *screen = SDL_GetVideoSurface();
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	glOrtho(0, screen->w, screen->h, 0, -1, 1);	
// 	glOrtho(0, 640, 480, 0, -1, 1);	
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
}

void GLFontEngine::regain3DbyPoppingMatrix() {
	glMatrixMode(GL_PROJECTION);
	glPopMatrix();
	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
}

void GLFontEngine::paintSDLRect(SDL_Rect r) {
	glBegin(GL_QUADS);
		glTexCoord2f(0.0f, 1.0f);
		glVertex2i(r.x, r.y);
			
		glTexCoord2f(0.0f, 0.0f);
		glVertex2i(r.x, r.y+r.h);
		
		glTexCoord2f(1.0f, 0.0f);
		glVertex2i(r.x+r.w, r.y+r.h);
		
		glTexCoord2f(1.0f, 1.0f);
		glVertex2i(r.x+r.w, r.y);
		
	glEnd();
}

GLFontEngine::GLFontEngine() {
	init();
	fontloaded = fontSelect("");
}

GLFontEngine::GLFontEngine(std::string fontstr) {
	init();
	fontloaded = fontSelect(fontstr);
}

void GLFontEngine::init() {
// 	r = g = b = a = 1.0f;
	col.set(1.0f, 1.0f, 1.0f);
	fsize = 16;
}

void GLFontEngine::setColor(float _r, float _g, float _b, float _a) {
// 	r = _r;
// 	g = _g;
// 	b = _b;
// 	a = _a;
	col.set(_r, _g, _b, _a);
}

void GLFontEngine::setColor(Color c) {
	col = c;
}

bool GLFontEngine::fontSelect(std::string fontstr) {
	if(fontpool.size()==0) {
		fontloaded = false;
		return false;
	}
	fontloaded = true; // fontstr oder fallbackfont
	if(fontpool[fontstr])
		font = fontpool[fontstr];
	else {
		//fallbackfont - ersten aus der liste
		font = (++fontpool.begin())->second;
// 		std::cout << "font: " << font << std::endl;
	}
		
	return true;
}

void GLFontEngine::renderText(std::string text, SDL_Rect pos) {
	renderLine(text, pos);
}

void GLFontEngine::renderLine(std::string text, SDL_Rect pos) {
// 	glColor4f(r, g, b, a);
	
	glMatrixMode(GL_TEXTURE);
	glLoadIdentity();
	glMatrixMode(GL_MODELVIEW);

	glColorGLC(col);
	
	if(fontloaded) {
		font->font->selectTexture();
		
		float step = pos.w / (float)text.length();
		float tex_x, tex_y;
		float tex_len = (1.0f/16.0f);
		
		for(unsigned int i=0; i<text.length(); i++) {
			int ch = text[i];
			if(ch<0) {
				ch += 256; // char geht wohl in machen f�llen nur von -128 bis +127 *hust*
			}
// 			std::cout << (int)text[i] << " ";
			tex_x = ((ch-1)%16 / 16.0f);
			tex_y = 1.0f-(floor((ch-1)/16) / 16.0f)-tex_len;

// 			std::cout << text[i] << " == " <<  tex_x << ", " << tex_y << std::endl;
			glBegin(GL_QUADS);
				glTexCoord2f(tex_x, tex_y+tex_len);
				glVertex2f(pos.x+i*step,			pos.y);
				
				glTexCoord2f(tex_x, tex_y);
				glVertex2f(pos.x+i*step,			pos.y+pos.h);
				
				glTexCoord2f(tex_x+tex_len, tex_y);
				glVertex2f(pos.x+(i+1)*step,	pos.y+pos.h);
				
				glTexCoord2f(tex_x+tex_len, tex_y+tex_len);
				glVertex2f(pos.x+(i+1)*step,	pos.y);
			glEnd();
		}
// 		std::cout << std::endl;
	} else {
		glBegin(GL_QUADS);
			glVertex2f(pos.x, 		pos.y);
			glVertex2f(pos.x+pos.w, pos.y);
			glVertex2f(pos.x+pos.w, pos.y+pos.h);
			glVertex2f(pos.x, 		pos.y+pos.h);
		glEnd();
	}
}

void GLFontEngine::renderLine(std::string str, int x, int y, bool center, SDL_Rect *rendered_to) {

	glEnable(GL_TEXTURE_2D);
	
	SDL_Rect m = { x, y, getTextWidth(str), fsize};

	if(center)
		m.x = m.x - m.w/2;
	renderLine(str, m);
	
	if(rendered_to)
		*rendered_to = m;
	
	return;
}

void GLFontEngine::renderLines(std::string str, int x, int y, bool center, SDL_Rect *rendered_to, int wrap, int paintbackground) {
	if(wrap) {
		// \n einf�gen, wenns zu gro� ist
		for(unsigned int i=0, a=0; i<str.length(); i++, a++) {
			if(str[i]!='\n') {
				if(a*font->charwidth*fsize>wrap) {
					str.insert(i, "\n");
				}
			} else {
				a=0;
			}
		}
	}
	
	if(paintbackground) {
		std::cout << "Paint Background implementieren.. ;) " << std::endl;
	}
	
	SDL_Rect m;
	int strlpos;
	int max_width = 0;
	int linecount = 0;
	std::string rstr;
	
	while(str!="") {
		
		if( (unsigned int)(strlpos = str.find('\n')) != std::string::npos) {
			
			rstr = str.substr(0, strlpos);
			str = str.substr(strlpos+1);
		} else {
			rstr = str;
			str = "";
		}
		renderLine(rstr, x, y+(int)(1.1*linecount*fsize), center, &m);
		
		max_width = std::max(max_width, (int)m.w);
		linecount++;
	}
	
	if(rendered_to) {
		m.w = max_width;
		m.y = y;
		*rendered_to = m;
	}
	
	return;
}

void GLFontEngine::setSize(int s) {
	fsize = s;
}

int GLFontEngine::getSize() {
	return fsize;
}

void GLFontEngine::getSDLRect(const std::string &str, SDL_Rect *r) {
	r->w = getTextWidth(str);
	r->h = getSize();
}

int GLFontEngine::getTextWidth(const std::string &moep) {
	if(fontloaded)
		return getTextWidthbyInt(moep.length());
// 		return (int)(moep.length()*(font->charwidth*fsize));
	else
		return 1;
}

int GLFontEngine::getTextWidthbyInt(int length) {
	return (int)(length*font->charwidth*fsize);
}

std::map<std::string, GLFont*> GLFontEngine::fontpool;

} // namespace segl