/*******************************************************************************
 *
 * TRIQS: a Toolbox for Research in Interacting Quantum Systems
 *
 * Copyright (C) 2012 by O. Parcollet
 *
 * TRIQS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * TRIQS. If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/
#ifndef TRIQS_ARRAYS_BLAS_LAPACK_COPY_H
#define TRIQS_ARRAYS_BLAS_LAPACK_COPY_H
#include "./tools.hpp"
//#include "./qcache.hpp"

namespace triqs { namespace arrays { namespace blas { 

 namespace f77 { // overload

  extern "C" { 
   void TRIQS_FORTRAN_MANGLING(dcopy)(const int & N , const double * x, const int& incx, double * y, const int& incy);
   void TRIQS_FORTRAN_MANGLING(zcopy)(const int & N , const std::complex<double> * x, const int& incx, std::complex<double> * y, const int& incy);
  }

  inline void copy (const int & N, const double* x, const int & incx, double* Y, const int & incy)  { 
   TRIQS_FORTRAN_MANGLING(dcopy)(N, x, incx,  Y, incy);
  }
  inline void copy (const int & N, const std::complex<double>* x, const int & incx, std::complex<double>* Y, const int & incy)  { 
   TRIQS_FORTRAN_MANGLING(zcopy)(N, x, incx,  Y, incy);
  }
 }

 template< typename VTX,  typename VTY> 
  struct use_blas_copy { 
   // I do not use cache here...
   static constexpr bool are_both_value_view = is_amv_value_or_view_class<VTX>::value && is_amv_value_or_view_class<VTY>::value;
   static constexpr bool value = are_both_value_view && is_blas_lapack_type<typename VTX::value_type>::value && have_same_value_type< VTX, VTY>::value;
  };


 /**
  * Blas 1: copy
  */
 template< typename VTX,  typename VTY> 
  typename std::enable_if<use_blas_copy<VTX,VTY>::value >::type 
  copy (VTX const & X, VTY & Y) { 
   static_assert( is_amv_value_or_view_class<VTX>::value, "blas1 bindings only take vector and vector_view");
   static_assert( is_amv_value_or_view_class<VTY>::value, "blas1 bindings only take vector and vector_view");
   //if (( X.size() != Y.size()) ) Y.resize(X.size()); 
   //const_qcache<VTX> Cx(X); // mettre la condition a la main
   f77::copy(X.size(), X.data_start(), X.stride(), Y.data_start(), Y.stride());
   //f77::copy(X.size(), Cx().data_start(), Cx().stride(), Y.data_start(), Y.stride());
  }

 // generic version
 template< typename VTX,  typename VTY> 
  typename std::enable_if< !use_blas_copy<VTX,VTY>::value >::type 
  copy (VTX const & X, VTY & Y) {
   if (X.size() != Y.size()) TRIQS_RUNTIME_ERROR << "blas copy generic : dimension mismatch "<< X.size()  << Y.size();
   const size_t N = X.size();  
   for (size_t i = 0; i < N; ++i) Y(i) = X(i);
  }

}}}// namespace

#endif