#include "sdlglutils.h"
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#define GL3_PROTOTYPES 1
#include <GL3/gl3.h>

#include <cstring>
#include <cstdlib>

SDL_Surface * flipSurface(SDL_Surface * surface);

GLuint loadTexture(const char * filename/*,bool useMipMap*/){
	GLuint glID;
	SDL_Surface * picture_surface = NULL;
	SDL_Surface *gl_surface = NULL;
	SDL_Surface * gl_fliped_surface = NULL;
	Uint32 rmask, gmask, bmask, amask;

	picture_surface = IMG_Load(filename);
	if (picture_surface == NULL)
		return 0;

	#if SDL_BYTEORDER == SDL_BIG_ENDIAN

		rmask = 0xff000000;
		gmask = 0x00ff0000;
		bmask = 0x0000ff00;
		amask = 0x000000ff;
	#else

		rmask = 0x000000ff;
		gmask = 0x0000ff00;
		bmask = 0x00ff0000;
		amask = 0xff000000;
	#endif

	SDL_PixelFormat format = *(picture_surface->format);
	format.BitsPerPixel = 32;
	format.BytesPerPixel = 4;
	format.Rmask = rmask;
	format.Gmask = gmask;
	format.Bmask = bmask;
	format.Amask = amask;

	gl_surface = SDL_ConvertSurface(picture_surface,&format,SDL_SWSURFACE);

	gl_fliped_surface = flipSurface(gl_surface);

	glGenTextures(1, &glID);

	glBindTexture(GL_TEXTURE_2D, glID);


// 	if (useMipMap){
// 
// 		gluBuild2DMipmaps(GL_TEXTURE_2D, 4, gl_fliped_surface->w,
// 				gl_fliped_surface->h, GL_RGBA,GL_UNSIGNED_BYTE,
// 				gl_fliped_surface->pixels);
// 
// 		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,
// 				GL_LINEAR_MIPMAP_LINEAR);
// 
// 	}else{
		glTexImage2D(GL_TEXTURE_2D, 0, 4, gl_fliped_surface->w,
			gl_fliped_surface->h, 0, GL_RGBA,GL_UNSIGNED_BYTE,
			gl_fliped_surface->pixels);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// 	}
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);


	SDL_FreeSurface(gl_fliped_surface);
	SDL_FreeSurface(gl_surface);
	SDL_FreeSurface(picture_surface);

	return glID;
}

int takeScreenshot(const char * filename){
	GLint viewport[4];
	Uint32 rmask, gmask, bmask, amask;
	SDL_Surface * picture, * finalpicture;

	glGetIntegerv(GL_VIEWPORT, viewport);

	#if SDL_BYTEORDER == SDL_BIG_ENDIAN

		rmask = 0xff000000;
		gmask = 0x00ff0000;
		bmask = 0x0000ff00;
		amask = 0x000000ff;
	#else

		rmask = 0x000000ff;
		gmask = 0x0000ff00;
		bmask = 0x00ff0000;
		amask = 0xff000000;
	#endif

	picture = SDL_CreateRGBSurface(SDL_SWSURFACE,viewport[2],viewport[3], 32,
					rmask, gmask, bmask, amask);
	SDL_LockSurface(picture);
	glReadPixels(viewport[0],viewport[1],viewport[2],viewport[3],GL_RGBA,
			GL_UNSIGNED_BYTE,picture->pixels);
	SDL_UnlockSurface(picture);

	finalpicture = flipSurface(picture);

	if (SDL_SaveBMP(finalpicture, filename)){
		return -1;
	}
	SDL_FreeSurface(finalpicture);
	SDL_FreeSurface(picture);

	return 0;
}

SDL_Surface * flipSurface(SDL_Surface * surface){
	int current_line,pitch;
	SDL_Surface * fliped_surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
					surface->w,surface->h,
					surface->format->BitsPerPixel,
					surface->format->Rmask,
					surface->format->Gmask,
					surface->format->Bmask,
					surface->format->Amask);



	SDL_LockSurface(surface);
	SDL_LockSurface(fliped_surface);

	pitch = surface->pitch;
	for (current_line = 0; current_line < surface->h; current_line ++){
		memcpy(&((unsigned char* )fliped_surface->pixels)[current_line*pitch],
		&((unsigned char* )surface->pixels)[(surface->h - 1  -
							current_line)*pitch],
		pitch);
	}

	SDL_UnlockSurface(fliped_surface);
	SDL_UnlockSurface(surface);
	return fliped_surface;
}

void drawAxis(double scale)
{
	glPushAttrib(GL_ALL_ATTRIB_BITS);
	glPushMatrix();
	glDisable(GL_LIGHTING);
	glDisable(GL_TEXTURE_2D);
	glEnable(GL_BLEND);
	glEnable(GL_LINE_SMOOTH);
	glLineWidth(2);
	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
	glScaled(scale,scale,scale);
	glBegin(GL_LINES);
	glColor3ub(255,0,0);
	glVertex3i(0,0,0);
	glVertex3i(1,0,0);
	glColor3ub(0,255,0);
	glVertex3i(0,0,0);
	glVertex3i(0,1,0);
	glColor3ub(0,0,255);
	glVertex3i(0,0,0);
	glVertex3i(0,0,1);
	glEnd();
	glPopMatrix();
	glPopAttrib();
}

int initFullScreen(unsigned int * width,unsigned int * height)
{
	SDL_Rect ** modes;

	modes = SDL_ListModes(NULL,SDL_FULLSCREEN|SDL_OPENGL);
	if ((modes == (SDL_Rect **)0)||(modes == (SDL_Rect **)-1))
		return 0;

	if (width != NULL)
		*width = modes[0]->w;
	if (height != NULL)
		*height = modes[0]->h;
	if (SDL_SetVideoMode(modes[0]->w,
				modes[0]->h,
				SDL_GetVideoInfo()->vfmt->BitsPerPixel,
				SDL_FULLSCREEN|SDL_OPENGL) == NULL)
		return -1;
	else{
		return 0;
	}
}

int XPMFromImage(const char * imagefile, const char * XPMfile)
{
	SDL_Surface * image,*image32bits;
	FILE * xpm;
	Uint32 pixel;
	Uint8 r,g,b,a;
	int y;
	unsigned int x;
	unsigned int w;
	char * xpm_name;
	Uint32 rmask, gmask, bmask, amask;

	image = IMG_Load(imagefile);
	if (image == NULL)
		return -1;

	#if SDL_BYTEORDER == SDL_BIG_ENDIAN

	rmask = 0xff000000;
	gmask = 0x00ff0000;
	bmask = 0x0000ff00;
	amask = 0x000000ff;
	#else

	rmask = 0x000000ff;
	gmask = 0x0000ff00;
	bmask = 0x00ff0000;
	amask = 0xff000000;
	#endif

	image32bits = SDL_CreateRGBSurface(SDL_SWSURFACE,
					image->w,image->h,
					32,rmask, gmask, bmask, amask);

	SDL_BlitSurface(image,NULL,image32bits,NULL);
	SDL_FreeSurface(image);

	xpm = fopen(XPMfile,"w");

	xpm_name = (char*)malloc(strlen(imagefile)*sizeof(char));
	strcpy(xpm_name,imagefile);
	if (strchr(xpm_name,'.') != NULL)
		*strchr(xpm_name,'.') = '\0';
	fprintf(xpm,"const char *%s[] =\n",xpm_name);
	free(xpm_name);

	fprintf(xpm,"\t{\n");
	fprintf(xpm,"\t\t/* width height num_colors chars_per_pixel */\n");
	w = ((image->w%8) == 0)?image32bits->w:8*(image32bits->w/8+1);

	fprintf(xpm,"\t\t\" %d %d 3 1 \",\n",w,image32bits->h);
	fprintf(xpm,"\t\t/* colors */\n");
	fprintf(xpm,"\t\t\"X c #000000\",\n");
	fprintf(xpm,"\t\t\". c #ffffff\",\n");
	fprintf(xpm,"\t\t\"  c None\",\n");
	fprintf(xpm,"\t\t/* pixels */\n");

	SDL_LockSurface(image32bits);

	for (y = 0; y < image32bits->h; y ++){
		fprintf(xpm,"\t\t\"");
		for (x = 0; (int)x < image32bits->w ; x ++){
			pixel = ((Uint32*)image32bits->pixels)[x+y*image32bits->pitch/4];
			SDL_GetRGBA(pixel,image32bits->format,&r,&g,&b,&a);
			if (a < 128)
				fprintf(xpm," ");
			else if ((r >= 128)||(g >= 128)||(b >= 128))
				fprintf(xpm,".");
			else
				fprintf(xpm,"X");
		}
		for (x = image32bits->w ; x < w ; x ++)
			fprintf(xpm," ");
		fprintf(xpm,"\",\n");
	}

	SDL_UnlockSurface(image32bits);
	SDL_FreeSurface(image32bits);
	fprintf(xpm,"\t\t\"0,0\"\n");
	fprintf(xpm,"\t};\n");
	return 0;
}

SDL_Cursor * cursorFromXPM(const char * xpm[]){
	int i, row, col;
	int width, height;
	Uint8 * data;
	Uint8 * mask;
	int hot_x, hot_y;
	SDL_Cursor * cursor = NULL;

	sscanf(xpm[0], "%d %d", &width, &height);
	data = (Uint8*)calloc(width/8*height,sizeof(Uint8));
	mask = (Uint8*)calloc(width/8*height,sizeof(Uint8));

	i = -1;
	for ( row=0; row<height; ++row )
	{
		for(col = 0; col < width; ++col){
			if(col % 8){
				data[i] <<= 1;
				mask[i] <<= 1;
			}else{
				++i;
				data[i] = mask[i] = 0;
			}
			switch (xpm[4+row][col]){
				case 'X':
					data[i] |= 0x01;
					mask[i] |= 0x01;
					break;
				case '.':
					mask[i] |= 0x01;
					break;
				case ' ':
					break;
			}
		}
	}
	sscanf(xpm[4+row], "%d,%d", &hot_x, &hot_y);
	cursor = SDL_CreateCursor(data, mask, width, height, hot_x, hot_y);
	free(data);
	free(mask);
	return cursor;
}

void initialiseTexture(const std::string & fichier, GLuint & texture){
	texture = loadTexture(fichier.c_str());
}