// SPDX-License-Identifier: Apache-2.0
// 
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------


//! \addtogroup fn_reshape
//! @{



template<typename T1>
arma_warn_unused
inline
typename enable_if2< is_arma_type<T1>::value, const Op<T1, op_reshape> >::result
reshape(const T1& X, const uword new_n_rows, const uword new_n_cols)
  {
  arma_debug_sigprint();
  
  return Op<T1, op_reshape>(X, new_n_rows, new_n_cols);
  }



template<typename T1>
arma_warn_unused
inline
typename enable_if2< is_arma_type<T1>::value, const Op<T1, op_reshape> >::result
reshape(const T1& X, const SizeMat& s)
  {
  arma_debug_sigprint();
  
  return Op<T1, op_reshape>(X, s.n_rows, s.n_cols);
  }



template<typename T1>
arma_frown("don't use this form: it will be removed")
inline
Mat<typename T1::elem_type>
reshape(const Base<typename T1::elem_type,T1>& X, const uword new_n_rows, const uword new_n_cols, const uword dim)
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  arma_conform_check( (dim > 1), "reshape(): parameter 'dim' must be 0 or 1" );
  
  const quasi_unwrap<T1> U(X.get_ref());
  const Mat<eT>& A     = U.M;
  
  Mat<eT> out;
  
  if(dim == 0)
    {
    op_reshape::apply_mat_noalias(out, A, new_n_rows, new_n_cols);
    }
  else
  if(dim == 1)
    {
    Mat<eT> tmp;
    
    op_strans::apply_mat_noalias(tmp, A);
    
    op_reshape::apply_mat_noalias(out, tmp, new_n_rows, new_n_cols);
    }
  
  return out;
  }



template<typename T1>
arma_warn_unused
inline
const OpCube<T1, op_reshape>
reshape(const BaseCube<typename T1::elem_type,T1>& X, const uword new_n_rows, const uword new_n_cols, const uword new_n_slices)
  {
  arma_debug_sigprint();
  
  return OpCube<T1, op_reshape>(X.get_ref(), new_n_rows, new_n_cols, new_n_slices);
  }



template<typename T1>
arma_warn_unused
inline
const OpCube<T1, op_reshape>
reshape(const BaseCube<typename T1::elem_type,T1>& X, const SizeCube& s)
  {
  arma_debug_sigprint();
  
  return OpCube<T1, op_reshape>(X.get_ref(), s.n_rows, s.n_cols, s.n_slices);
  }



template<typename T1>
arma_warn_unused
inline
const SpOp<T1, spop_reshape>
reshape(const SpBase<typename T1::elem_type, T1>& X, const uword new_n_rows, const uword new_n_cols)
  {
  arma_debug_sigprint();
  
  return SpOp<T1, spop_reshape>(X.get_ref(), new_n_rows, new_n_cols);
  }



template<typename T1>
arma_warn_unused
inline
const SpOp<T1, spop_reshape>
reshape(const SpBase<typename T1::elem_type, T1>& X, const SizeMat& s)
  {
  arma_debug_sigprint();
  
  return SpOp<T1, spop_reshape>(X.get_ref(), s.n_rows, s.n_cols);
  }



//



template<typename oT>
arma_warn_unused
inline
field<oT>
reshape(const field<oT>& A, const uword new_n_rows, const uword new_n_cols, const uword new_n_slices = uword(1))
  {
  arma_debug_sigprint();
  
  field<oT> B(new_n_rows, new_n_cols, new_n_slices);
  
  const uword n_elem_to_copy = (std::min)(A.n_elem, B.n_elem);
  
  for(uword i=0; i < n_elem_to_copy; ++i)  { B.at(i) = A.at(i); }
  
  return B;
  }



template<typename oT>
arma_warn_unused
inline
field<oT>
reshape(const field<oT>& A, const SizeMat& s)
  {
  arma_debug_sigprint();
  
  return reshape(A, s.n_rows, s.n_cols);
  }



template<typename oT>
arma_warn_unused
inline
field<oT>
reshape(const field<oT>& A, const SizeCube& s)
  {
  arma_debug_sigprint();
  
  return reshape(A, s.n_rows, s.n_cols, s.n_slices);
  }



//! @}
