// Copyright (C) 2012-2014 National ICT Australia (NICTA)
// 
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// -------------------------------------------------------------------
// 
// Written by Conrad Sanderson - http://conradsanderson.id.au
// Written by Ryan Curtin


//! \addtogroup spop_strans
//! @{



template<typename eT>
arma_hot
inline
void
spop_strans::apply_spmat(SpMat<eT>& out, const SpMat<eT>& X)
  {
  arma_extra_debug_sigprint();
  
  typedef typename umat::elem_type ueT;
  
  const uword N = X.n_nonzero;
  
  if(N == uword(0))
    {
    out.zeros(X.n_cols, X.n_rows);
    return;
    }
  
  umat locs(2, N);
  
  typename SpMat<eT>::const_iterator it = X.begin();
  
  for(uword count = 0; count < N; ++count)
    {
    ueT* locs_ptr = locs.colptr(count);
    
    locs_ptr[0] = it.col();
    locs_ptr[1] = it.row();
    
    ++it;
    }
  
  const Col<eT> vals(const_cast<eT*>(X.values), N, false);
  
  SpMat<eT> tmp(locs, vals, X.n_cols, X.n_rows);
  
  out.steal_mem(tmp);
  }



template<typename T1>
arma_hot
inline
void
spop_strans::apply_proxy(SpMat<typename T1::elem_type>& out, const T1& X)
  {
  arma_extra_debug_sigprint();
  
  typedef typename   T1::elem_type  eT;
  typedef typename umat::elem_type ueT;
  
  const SpProxy<T1> p(X);
  
  const uword N = p.get_n_nonzero();
  
  if(N == uword(0))
    {
    out.zeros(p.get_n_cols(), p.get_n_rows());
    return;
    }
  
  umat locs(2, N);
  
  Col<eT> vals(N);
  
  eT* vals_ptr = vals.memptr();
  
  typename SpProxy<T1>::const_iterator_type it = p.begin();
  
  for(uword count = 0; count < N; ++count)
    {
    ueT* locs_ptr = locs.colptr(count);
    
    locs_ptr[0] = it.col();
    locs_ptr[1] = it.row();
    
    vals_ptr[count] = (*it);
    
    ++it;
    }
  
  SpMat<eT> tmp(locs, vals, p.get_n_cols(), p.get_n_rows());
  
  out.steal_mem(tmp);
  }



template<typename T1>
arma_hot
inline
void
spop_strans::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_strans>& in)
  {
  arma_extra_debug_sigprint();
  
  if(is_SpMat<T1>::value)
    {
    const unwrap_spmat<T1> tmp(in.m);
    
    spop_strans::apply_spmat(out, tmp.M);
    }
  else
    {
    spop_strans::apply_proxy(out, in.m);
    }
  }



//! for transpose of non-complex matrices, redirected from spop_htrans::apply()
template<typename T1>
arma_hot
inline
void
spop_strans::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_htrans>& in)
  {
  arma_extra_debug_sigprint();
  
  if(is_SpMat<T1>::value)
    {
    const unwrap_spmat<T1> tmp(in.m);
    
    spop_strans::apply_spmat(out, tmp.M);
    }
  else
    {
    spop_strans::apply_proxy(out, in.m);
    }
  }



//! @}