/* ----------------------------- MNI Header -----------------------------------
@NAME       :
@DESCRIPTION: Simplified whole file in a memory MINC access library, using minc_1_rw interface
@COPYRIGHT  :
              Copyright 2007 Vladimir Fonov, McConnell Brain Imaging Centre,
              Montreal Neurological Institute, McGill University.
              Permission to use, copy, modify, and distribute this
              software and its documentation for any purpose and without
              fee is hereby granted, provided that the above copyright
              notice appear in all copies.  The author and McGill University
              make no representations about the suitability of this
              software for any purpose.  It is provided "as is" without
              express or implied warranty.
---------------------------------------------------------------------------- */
#ifndef MINC_1_SIMPLE_RW_H
#define MINC_1_SIMPLE_RW_H

#include "minc_1_simple.h"
#include "minc_io_simple_volume.h"
#include "minc_io_fixed_vector.h"
#include "minc_io_4d_volume.h"

namespace minc
{

  template<class T> void load_simple_volume(minc_1_reader& rw,simple_volume<T>& vol)
  {
    if(rw.ndim(1)<=0||rw.ndim(2)<=0||rw.ndim(3)<=0||rw.ndim(4)>0)
      REPORT_ERROR("Need 3D minc file");

    vol.resize(rw.ndim(1),rw.ndim(2),rw.ndim(3));

    if(typeid(T)==typeid(unsigned char))
    {
      rw.setup_read_byte();
      load_standard_volume(rw,vol.c_buf());
    }
    else if(typeid(T)==typeid(int))
    {
      rw.setup_read_int();
      load_standard_volume(rw,vol.c_buf());
    }
    else if(typeid(T)==typeid(fixed_vec<3,float>))
    {
      rw.setup_read_float();
      load_standard_volume<float>(rw,(float*)vol.c_buf());
    }
    else if(typeid(T)==typeid(float))
    {
      rw.setup_read_float();
      load_standard_volume(rw,vol.c_buf());
    }
    else if(typeid(T)==typeid(fixed_vec<3,double>))
    {
      rw.setup_read_double();
      load_standard_volume<double>(rw,(double*)vol.c_buf());
    }
    else if(typeid(T)==typeid(double))
    {
      rw.setup_read_double();
      load_standard_volume(rw,vol.c_buf());
    } else
			REPORT_ERROR("Data type not supported for minc io");

    //set coordinate transfer parameters
    for(int i=0;i<3;i++)
    {
      vol.step()[i]=rw.nspacing(i+1);
      vol.start()[i]=rw.nstart(i+1);

      if(rw.have_dir_cos(i+1))
      {
        for(int j=0;j<3;j++)
          vol.direction_cosines(i)[j]=rw.ndir_cos(i+1,j);
      } else {
        for(int j=0;j<3;j++)
          vol.direction_cosines(i)[j]=(i==j?1.0:0.0); //identity
      }
    }
  }

  template<class T> void save_simple_volume(minc_1_writer& rw,const simple_volume<T>& vol)
  {
    if(typeid(T)==typeid(unsigned char))
    {
      rw.setup_write_byte();
      save_standard_volume(rw,vol.c_buf());
    }
    else if(typeid(T)==typeid(int))
    {
      rw.setup_write_int();
      save_standard_volume(rw,vol.c_buf());
    }
    else if(typeid(T)==typeid(fixed_vec<3,float>))
    {
      rw.setup_write_float();
      save_standard_volume<float>(rw,(float*)vol.c_buf());
    }
    else if(typeid(T)==typeid(float))
    {
      rw.setup_write_float();
      save_standard_volume(rw,vol.c_buf());
    }
    else if(typeid(T)==typeid(fixed_vec<3,double>))
    {
      rw.setup_write_double();
      save_standard_volume<double>(rw,(double*)vol.c_buf());
    }
    else if(typeid(T)==typeid(double))
    {
      rw.setup_write_double();
      save_standard_volume(rw,vol.c_buf());
    }
    else
			REPORT_ERROR("Data type not supported for minc io");
  }


  template<class T> void load_4d_volume(minc_1_reader& rw,simple_4d_volume<T>& vol)
  {
    //if(rw.ndim(1)<=0||rw.ndim(2)<=0||rw.ndim(3)<=0||rw.ndim(4)<=0)
    //  REPORT_ERROR("Need 4D minc file");

    vol.resize(rw.ndim(1),rw.ndim(2),rw.ndim(3),rw.ndim(4)>0?rw.ndim(4):1); //always assume 4 dimensions

    if(typeid(T)==typeid(unsigned char))
      rw.setup_read_byte();
    else if(typeid(T)==typeid(int))
      rw.setup_read_int();
    else if(typeid(T)==typeid(fixed_vec<3,float>))
      rw.setup_read_float();
    else if(typeid(T)==typeid(float))
      rw.setup_read_float();
    else if(typeid(T)==typeid(fixed_vec<3,double>))
      rw.setup_read_double();
    else if(typeid(T)==typeid(double))
      rw.setup_read_double();
		else
			REPORT_ERROR("Data type not supported for minc io");

    std::vector<size_t> strides(MAX_VAR_DIMS,0);
    size_t str=1;

    for(size_t i=0;i<5;i++) //T is a special case
    {
      if(rw.map_space(i)<0) continue;
      strides[rw.map_space(i)]=str;
      str*=rw.ndim(i);
    }

    if(rw.map_space(4)>=0)
      strides[rw.map_space(4)]=0; //t dimension

    minc_input_iterator<T> in(rw);
    for(in.begin();!in.last();in.next())
    {
      size_t address=0;
      size_t slice=0;
      for(int i=0;i<rw.dim_no();i++)
      {
        if(strides[i]>0)
          address+=in.cur()[i]*strides[i];
        else //
          slice=in.cur()[i];
      }
      vol.frame(slice).c_buf()[address]=in.value();
    }

    //set coordinate transfer parameters
    for(int i=0;i<3;i++)
    {
      vol.step()[i]=rw.nspacing(i+1);
      vol.start()[i]=rw.nstart(i+1);

      if(rw.have_dir_cos(i+1))
      {
        for(int j=0;j<3;j++)
          vol.direction_cosines(i)[j]=rw.ndir_cos(i+1,j);
      } else {
        for(int j=0;j<3;j++)
          vol.direction_cosines(i)[j]=(i==j?1.0:0.0); //identity
      }
    }
    if(rw.ndim(4)>0)
    {
      vol.t_start()=rw.nstart(4);//T
      vol.t_step()=rw.nspacing(4);//T
    } else {
      vol.t_start()=0;//T
      vol.t_step()=0;//T
    }
  }

  template<class T> void save_4d_volume(minc_1_writer& rw,const simple_4d_volume<T>& vol)
  {
    if(typeid(T)==typeid(unsigned char))
      rw.setup_write_byte();
    else if(typeid(T)==typeid(int))
      rw.setup_write_int();
    else if(typeid(T)==typeid(fixed_vec<3,float>))
      rw.setup_write_float();
    else if(typeid(T)==typeid(float))
      rw.setup_write_float();
    else if(typeid(T)==typeid(fixed_vec<3,double>))
      rw.setup_write_double();
    else if(typeid(T)==typeid(double))
      rw.setup_write_double();
    else
			REPORT_ERROR("Data type not supported for minc io");

    std::vector<size_t> strides(MAX_VAR_DIMS,0);
    size_t str=1;
    for(size_t i=0;i<4;i++)//T is a special
    {
      if(rw.map_space(i)<0) continue;
      strides[rw.map_space(i)]=str;
      str*=rw.ndim(i);
    }

    if(rw.map_space(4)>=0)
      strides[rw.map_space(4)]=0; //t dimension

    minc_output_iterator<T> out(rw);
    for(out.begin();!out.last();out.next())
    {
      size_t address=0;
      size_t slice=0;
      for(int i=0;i<rw.dim_no();i++)
      {
        if(strides[i]>0)
          address+=out.cur()[i]*strides[i];
        else //
          slice=out.cur()[i];
      }
      out.value(vol.frame(slice).c_buf()[address]);
    }
  }

  bool is_same(minc_1_reader& one,minc_1_reader& two,bool verbose=true);

  template<class T> void load_minc_file(const char *file,simple_4d_volume<T>& vol)
  {
      minc_1_reader rdr;
      rdr.open(file);
      load_4d_volume(rdr,vol);
  }

  template<class T> void generate_info(const simple_4d_volume<T>& vol,minc_info& info)
  {
     bool have_time=vol.frames()>1||vol.t_step()!=0.0; //assume that it is 3D file otherwise

     bool is_vector=false;

      if(typeid(T)==typeid(fixed_vec<3,float>)) {
        is_vector=true;
      }

      info.resize(3+(is_vector?1:0)+(have_time?1:0));

      if(is_vector)
      {
        info[0].dim=dim_info::DIM_VEC;
        info[0].length=3;
        info[0].step=1;

      }

      for(int i=0;i<3;i++)
      {
        int ii=i+(is_vector?1:0);
        info[ii].dim=dim_info::dimensions( dim_info::DIM_X+i);

        info[ii].length=vol.dim(i);
        info[ii].step  =vol.step()[i];
        info[ii].start =vol.start()[i];
        info[ii].have_dir_cos=true;

        for(int j=0;j<3;j++)
          info[ii].dir_cos[j]=vol.direction_cosines(i)[j];
      }

      if(have_time)
      {
        info[3+(is_vector?1:0)].dim=dim_info::DIM_TIME;
        info[3+(is_vector?1:0)].step=vol.t_step();
        info[3+(is_vector?1:0)].start=vol.t_start();
        info[3+(is_vector?1:0)].length=vol.frames();
      }

  }

  template<class T> void save_minc_file(const char *file,const simple_4d_volume<T>& vol,
                                        const char* history=NULL,const minc_1_reader* original=NULL,
                                        nc_type datatype=NC_NAT,bool is_signed=false)
  {
      minc_1_writer wrt;
      //convert parameters to info

      if(typeid(T)==typeid(unsigned char))
      {
        if(datatype==NC_NAT) datatype=NC_BYTE;

      } else if(typeid(T)==typeid(int)) {
        if(datatype==NC_NAT) datatype=NC_INT;

        is_signed=true;
      } else if(typeid(T)==typeid(unsigned int))  {
        if(datatype==NC_NAT) datatype=NC_INT;

        is_signed=false;
      } else if(typeid(T)==typeid(float))  {
        if(datatype==NC_NAT) datatype=NC_FLOAT;

        is_signed=true;
      } else if(typeid(T)==typeid(fixed_vec<3,float>)) {
        if(datatype==NC_NAT) datatype=NC_FLOAT;

        is_signed=true;
      } else if(typeid(T)==typeid(double))  {
        if(datatype==NC_NAT) datatype=NC_DOUBLE;

        is_signed=true;
      } else if(typeid(T)==typeid(fixed_vec<3,double>)) {
        if(datatype==NC_NAT) datatype=NC_DOUBLE;

        is_signed=true;
      } else
        REPORT_ERROR("Unsupported data type!");

      minc_info info;
      generate_info<T>(vol,info);

      wrt.open(file,info,2,datatype,is_signed);

      if(original)
      {
        wrt.copy_headers(*original);
      }

      if(history)
        wrt.append_history(history);

      save_4d_volume(wrt,vol);
  }

}

#endif //MINC_1_SIMPLE_RW_H
