#include <iostream>
#include <SDL.h>
#include <SDL_opengl.h>
#include <SDL_image.h>
#include "polygon.h"
#include "xml.h"
#include "sys.h"
#include "triangle.h"
#include "vertex.h"
#include "Span.h"
#include "SpanC.h"
#include "scene_graph_pack.h"
#include "error.h"
#include "viewer_types.h"
using namespace std;

//extern int decode(char *cont, char *file_name);
extern int decode(char *cont, FILE *outfile);


SDL_Surface* Polygon::texture_image;

Polygon::Polygon(void)
{
    xyz[0] = 0;
    xyz[1] = 0;
    xyz[2] = 0;
    xyz[3] = 1;
    c_xyz[0] = 0;
    c_xyz[1] = 0;
    c_xyz[2] = 0;
    c_xyz[3] = 1;
    angle[0] = 0;
    angle[1] = 0;
    angle[2] = 0;
    angle[3] = 1;

    for (int i = 0; i < 16; i++) {
	matrix[i] = 0;
    }
}

void
Polygon::position_init(void)
{
    xyz[0] = 0;
    xyz[1] = 0;
    xyz[2] = 0;
    xyz[3] = 1;
    c_xyz[0] = 0;
    c_xyz[1] = 0;
    c_xyz[2] = 0;
    c_xyz[3] = 1;
    angle[0] = 0;
    angle[1] = 0;
    angle[2] = 0;
    angle[3] = 1;

    for (int i = 0; i < 16; i++) {
	matrix[i] = 0;
    }
}

#if 0
void Polygon::draw(SceneGraphPack *sgp)
{
    float xyz1[4],xyz2[4],xyz3[4];

    /***SceneGraphUpdate***/
    //sgp_update();
    for (int i = 0; i < sgp->info.size; i++) {
	SceneGraphNode node = sgp->node[i];

	/***draw***/
	int n,nt;
	for(n=0,nt=0; n<node.size*3; n+=9,nt+=6) {
	    xyz1[0] = node.vertex[n];
	    xyz1[1] = node.vertex[n+1];
	    xyz1[2] = node.vertex[n+2]*-1;
	    xyz1[3] = 1;
	    xyz2[0] = node.vertex[n+3];
	    xyz2[1] = node.vertex[n+3+1];
	    xyz2[2] = node.vertex[n+3+2]*-1;
	    xyz2[3] = 1;
	    xyz3[0] = node.vertex[n+6];
	    xyz3[1] = node.vertex[n+6+1];
	    xyz3[2] = node.vertex[n+6+2]*-1;
	    xyz3[3] = 1;

	    rotate(xyz1, node.translation);
	    rotate(xyz2, node.translation);
	    rotate(xyz3, node.translation);

	    Vertex *ver1 = new Vertex(xyz1[0],xyz1[1],xyz1[2],node.texture[nt],node.texture[nt+1]);
	    Vertex *ver2 = new Vertex(xyz2[0],xyz2[1],xyz2[2],node.texture[nt+2],node.texture[nt+2+1]);
	    Vertex *ver3 = new Vertex(xyz3[0],xyz3[1],xyz3[2],node.texture[nt+4],node.texture[nt+4+1]);

	    Triangle *tri = new Triangle(ver1,ver2,ver3);
	    Span_c *span = new Span_c();
	    span->viewer = viewer;
	    span->p = this;
	    span->create_span(tri,texture_image);
	    delete ver1;
	    delete ver2;
	    delete ver3;
	    delete tri;
	    delete span;
	}
    }
}


void Polygon::draw(PolygonPack *pp)
{
    for(int n=0; n<pp->info.size; n++)
    {
	Vertex *ver1 = new Vertex(pp->tri[n].ver1.x,pp->tri[n].ver1.y,pp->tri[n].ver1.z,pp->tri[n].ver1.tex_x,pp->tri[n].ver1.tex_y);
	Vertex *ver2 = new Vertex(pp->tri[n].ver2.x,pp->tri[n].ver2.y,pp->tri[n].ver2.z,pp->tri[n].ver2.tex_x,pp->tri[n].ver2.tex_y);
	Vertex *ver3 = new Vertex(pp->tri[n].ver3.x,pp->tri[n].ver3.y,pp->tri[n].ver3.z,pp->tri[n].ver3.tex_x,pp->tri[n].ver3.tex_y);

	Triangle *tri = new Triangle(ver1,ver2,ver3);
	Span_c *span = new Span_c();
	span->viewer = viewer;
	span->p = this;
	span->create_span(tri,texture_image);
	delete ver1;
	delete ver2;
	delete ver3;
	delete tri;
	delete span;
    }
}

void Polygon::draw(SpanPack *sp)
{
    Span *span;

    for (int n = 0; n < sp->info.size; n++) {
	span = &sp->span[n];

	//int x = span->x;
	//int y = span->y;
	float z = span->start_z;
	int end = span->length_x;
	float zpos = span->end_z;
	float tex1 = span->tex_x1;
	float tex2 = span->tex_x2;
	float tey1 = span->tex_y1;
	float tey2 = span->tex_y2;
	Uint32 rgb;
	int tex_xpos;
	int tex_ypos;
	int tex_zpos;
	float tex_x, tex_y, tex_z;

	if (end == 1) {
	    tex_xpos = (int)((span->tex_height-1) * tex1);
	    tex_ypos = (int)((span->tex_width-1) * tey1);
	    tex_zpos = (int)z;
	    rgb = get_rgb(tex_xpos, tex_ypos);
	    //viewer->write_pixel(x, y, zpos, rgb);
	} else {
	    for (int j = 0; j < end; j++) {
		tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
		tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
		tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
		if (tex_x > 1) tex_x = 1;
		if (tex_y > 1) tex_y = 1;
		tex_xpos = (int)((span->tex_height-1) * tex_x);
		tex_ypos = (int)((span->tex_width-1) * tex_y);
		rgb = get_rgb(tex_xpos,tex_ypos);
		//viewer->write_pixel(j + x, y, tex_z, rgb);
	    }
	}
    }
}

#endif

void Polygon::pickup_coordinate(char *cont)
{
    for(int n=0; n<size*3; n+=3)
    {
	cont = pickup_float(cont, data+n);
	cont = pickup_float(cont, data+n+1);
	cont = pickup_float(cont, data+n+2);
      
	if (cont == NULL)
	{
	    cout << "Analyzing obj data failed coordinate\n";
	}
    }
}

void Polygon::pickup_normal(char *cont)
{
    for(int n=size*3;n<size*6;n+=3)
    {
	cont = pickup_float(cont,data+n);
	cont = pickup_float(cont,data+n+1);
	cont = pickup_float(cont,data+n+2);
      
	if (cont == NULL)
	{
	    cout << "Analyzing obj data failed normal\n";
	}
    }
}

void Polygon::pickup_model(char *cont)
{
    cont = pickup_float(cont,c_xyz);
    cont = pickup_float(cont,c_xyz+1);
    cont = pickup_float(cont,c_xyz+2);
  
    if (cont == NULL)
    {
	cout << "Analyzing obj data failed model\n";
    }
}

void Polygon::pickup_texture(char *cont)
{
    for(int n=size*6; n<size*9; n+=3)
    {
	cont = pickup_float(cont,data+n);
	cont = pickup_float(cont,data+n+1);
	data[n+2] = 1.0;
      
	if (cont == NULL)
	{
	    cout << "Analyzing obj data failed texture\n";
	}
    }
}

char *get_pixel(int tx, int ty, SDL_Surface *texture_image)
{
    return (char*)texture_image->pixels+(texture_image->format->BytesPerPixel*((texture_image->w)*ty+tx));
}

unsigned my_ntohl(unsigned u) {
    //     rr gg bb 00
    //           rr
    //     bb gg rr
    //unsigned u1 =   ((u&0xff)<<24) +
    //         ((u&0xff00)<<8) +
    //         ((u&0xff0000)>>8) +
    //         ((u&0xff000000)>>24);
    unsigned u1;
    unsigned b = (u&0xff000000)>>24;
    unsigned g = (u&0xff0000)>>16;
    unsigned r = (u&0xff00)>>8;
    u1 = r + (g<<8) + (b<<16);
    //printf("pixel %x->%x\n",u,u1);
    return u1;
}

Uint32 Polygon::get_rgb(int tx, int ty)
{
    SDL_PixelFormat *fmt;
    //Uint32 temp, pixel;
    Uint8 red, green, blue;
  
    fmt = texture_image->format;

    if (tx<0) tx = 0;
    if (texture_image->w-1< tx) tx = texture_image->w-1 ;
    if (ty<0) ty = 0;
    if (texture_image->h-1< ty) ty = texture_image->h-1 ;



    //SDL_LockSurface(texture_image);
    char *p = get_pixel(tx,ty,texture_image);
#if 0
    pixel = my_ntohl(*(Uint32*)p);
    //printf("pixel = %d\n", pixel);
    //printf("pixel %x bpp = %d ",p, fmt->BytesPerPixel);
    //SDL_UnlockSurface(texture_image);
  
    temp = pixel&fmt->Rmask;
    temp = temp>>fmt->Rshift;
    temp = temp<<fmt->Rloss;
    red = (Uint8)temp;
  
    temp = pixel&fmt->Gmask;
    temp = temp>>fmt->Gshift;
    temp = temp<<fmt->Gloss;
    green = (Uint8)temp;
  
    temp = pixel&fmt->Bmask;
    temp = temp>>fmt->Bshift;
    temp = temp<<fmt->Bloss;
    blue = (Uint8)temp;
#endif
    blue  = (Uint8) p[0];
    green = (Uint8) p[1];
    red   = (Uint8) p[2];
	  
    //printf("tx = %d ty = %d ", tx,ty); 
    //printf("pixel color =>  R: %d,  G: %d,  B: %d\n", red, green, blue);

    SDL_PixelFormat *pf;
    //pf = viewer->screen->format;

    //cout << SDL_MapRGB(pf, red, green, blue) << endl;
    return SDL_MapRGB(pf, red, green, blue);
}