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#include <assert.h>
#include <stdio.h>
#ifdef WIN32
#include <windows.h>
#include <io.h>
#endif
#include <string.h>
#include <stdlib.h>

#include <iostream>
#include <CGLA/Vec2i.h>
#include <CGLA/Vec2f.h>
#include "Texmap.h"
#include <IL/il.h>
#include <IL/ilu.h>


using namespace std;
using namespace CGLA;

namespace Geometry
{
        Texmap::Texmap(): image(0), bpp(0), size_x(0), 
                                                                                size_y(0), load_size_x(0), load_size_y(0)
        {}
        
        Texmap::~Texmap() 
        {
        }

        Vec3f Texmap::get_texel(int u, int v) 
        {
                int bits = bpp/8;
                Vec3f value;
                value[0] = image[(u*size_x+v)*bits + 0];
                value[1] = image[(u*size_x+v)*bits + 1];
                value[2] = image[(u*size_x+v)*bits + 2];
                return value/256.0f;
        }

        bool Texmap::load(const std::string& _name)
        {
                image = 0;
                bpp = 0;
                size_x = 0;
                size_y = 0;
                load_size_x = 0;
                load_size_y = 0;
                name = _name;

                ILenum Error;
                ILuint  ImgId;

                static bool washere = false;
                if(!washere)
                        {
                                ilInit();
                                iluInit();
                                washere=true;
                        }
                ilEnable(IL_CONV_PAL);
                ilEnable(IL_ORIGIN_SET);
                ilOriginFunc(IL_ORIGIN_LOWER_LEFT);
                ilGenImages(1, &ImgId);
                ilBindImage(ImgId);
                char* name_cstr = const_cast<char*>(name.c_str());
                if(!ilLoadImage(name_cstr))
                        {
                                cout << "could not load <" << name  << ">" << endl;
                                return false;
                        }

                load_size_x = ilGetInteger(IL_IMAGE_WIDTH);
                load_size_y = ilGetInteger(IL_IMAGE_HEIGHT);
                bpp = ilGetInteger(IL_IMAGE_BITS_PER_PIXEL);
                
                if (bpp==24)
                        ilConvertImage(IL_RGB, IL_UNSIGNED_BYTE);
                else if (bpp==32)
                        ilConvertImage(IL_RGBA, IL_UNSIGNED_BYTE);
                else if (bpp==8)
                        ilConvertImage(IL_LUMINANCE, IL_UNSIGNED_BYTE);
                else 
                        assert(0);

                int i;
                for (i=2;i<=4096 ;i*=2) 
                        if (i>=load_size_x) 
                                break;
                size_x = i;
                for (i=2;i<=4096 ;i*=2) 
                        if (i>=load_size_y) 
                                break;
                size_y = i;
                
                if(size_x != load_size_x || size_y != load_size_y)
                        {
                                iluImageParameter(ILU_FILTER, ILU_BILINEAR);
                                iluScale(size_x, size_y, 1);
                        }

                const int image_size =size_x*size_y*ilGetInteger(IL_IMAGE_BYTES_PER_PIXEL);
                image = new unsigned char[image_size];
                memcpy(image, ilGetData(), image_size);
                ilDeleteImages(1, &ImgId);
                
                while ((Error = ilGetError())) {
                        cout << __LINE__ << "Error: " << iluErrorString(Error) << endl;
                        return false;
                }
                return true;
        }
        
        float log2(float val) 
        {
                return log(val)/log(2.0f);
        }
        
        void Texmap::gl_bind()
        {
    glBindTexture(GL_TEXTURE_2D, id);
        }
        

  void Texmap::gl_init()
  {
    GLint internalFormat=0;
    GLenum format=0;

    glGenTextures(1, &id);
    switch (bpp) 
      {
      case 8:
                                internalFormat =  GL_LUMINANCE;
                                format = GL_LUMINANCE;
                                break;
      case 24:
                                internalFormat =  GL_RGB;
                                format = GL_RGB;
                                break;
      case 32:
                                internalFormat =  GL_RGBA;
                                format = GL_RGBA;
                                break;
      default:
                                assert(0);
      }
        
    glBindTexture(GL_TEXTURE_2D, id);
    glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, size_x, size_y, 0, 
                                                                 format, GL_UNSIGNED_BYTE, image); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
  }

}