#include<hgl/log/LogInfo.h>
#include"ILImage.h"
#include"TextureFileCreater.h"

TextureFileCreater *CreateTextureFileCreaterR(const PixelFormat *,ILImage *);
TextureFileCreater *CreateTextureFileCreaterRG(const PixelFormat *,ILImage *);
TextureFileCreater *CreateTextureFileCreaterRGB(const PixelFormat *,ILImage *);
TextureFileCreater *CreateTextureFileCreaterRGBA(const PixelFormat *,ILImage *);

TextureFileCreater *CreateTextureFileCreaterCompress(const PixelFormat *,ILImage *);

using CTFC_FUNC=TextureFileCreater *(*)(const PixelFormat *,ILImage *);

static CTFC_FUNC CreateTFC[4]={CreateTextureFileCreaterR,CreateTextureFileCreaterRG,CreateTextureFileCreaterRGB,CreateTextureFileCreaterRGBA};

bool ConvertImage(const OSString &filename,const PixelFormat **pf,const bool mipmaps)
{
    ILImage image;

    if(!image.LoadFile(filename))
        return(false);
 
    int miplevel=1;

    if(mipmaps)
        miplevel=hgl::GetMipLevel(image.width(),image.height());
    
    const uint channels=image.channels();

    if(channels<0||channels>4)
    {
        LOG_ERROR(OS_TEXT("image format don't support "));
        return(false);
    }

    TextureFileCreater *tex_file_creater;
    const PixelFormat *fmt=pf[channels-1];

    if(fmt->format<ColorFormat::COMPRESS)
        tex_file_creater=CreateTFC[channels-1](fmt,&image);
    else
        tex_file_creater=CreateTextureFileCreaterCompress(fmt,&image);

    if(!tex_file_creater->WriteFileHeader(filename,miplevel))
    {
        tex_file_creater->Delete();
        LOG_ERROR(OS_TEXT("Write file header failed."));
        return(false);
    }

    tex_file_creater->InitFormat();

    uint width=image.width();
    uint height=image.height();
    uint total=0;
    uint bytes=0;

    for(int i=0;i<miplevel;i++)
    {
        bytes=tex_file_creater->Write();

        if(bytes<=0)
        {
            tex_file_creater->Delete();
            return(false);
        }

        total+=bytes;

        if(i<miplevel)
        {
            if(width>1)width>>=1;
            if(height>1)height>>=1;

            image.Resize(width,height);
        }
    }

    LOG_INFO(OS_TEXT("pixel total length: ")+OSString::valueOf(total)+OS_TEXT(" bytes."));

    tex_file_creater->Close();

    delete tex_file_creater;
    return(true);
}