// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, 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 2 of
// the License, or (at your option) any later version.
//
// Eigen 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 Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.

#ifndef EIGEN_BLAS_COMMON_H
#define EIGEN_BLAS_COMMON_H

#include <iostream>
#include <complex>

#ifndef SCALAR
#error the token SCALAR must be defined to compile this file
#endif

#include <Eigen/src/misc/blas.h>


#define NOTR    0
#define TR      1
#define ADJ     2

#define LEFT    0
#define RIGHT   1

#define UP      0
#define LO      1

#define NUNIT   0
#define UNIT    1

#define INVALID 0xff

#define OP(X)   (   ((X)=='N' || (X)=='n') ? NOTR   \
                  : ((X)=='T' || (X)=='t') ? TR     \
                  : ((X)=='C' || (X)=='c') ? ADJ    \
                  : INVALID)

#define SIDE(X) (   ((X)=='L' || (X)=='l') ? LEFT   \
                  : ((X)=='R' || (X)=='r') ? RIGHT  \
                  : INVALID)

#define UPLO(X) (   ((X)=='U' || (X)=='u') ? UP     \
                  : ((X)=='L' || (X)=='l') ? LO     \
                  : INVALID)

#define DIAG(X) (   ((X)=='N' || (X)=='N') ? NUNIT  \
                  : ((X)=='U' || (X)=='u') ? UNIT   \
                  : INVALID)


inline bool check_op(const char* op)
{
  return OP(*op)!=0xff;
}

inline bool check_side(const char* side)
{
  return SIDE(*side)!=0xff;
}

inline bool check_uplo(const char* uplo)
{
  return UPLO(*uplo)!=0xff;
}

#include <Eigen/Core>
#include <Eigen/Jacobi>


namespace Eigen {
#include "BandTriangularSolver.h"
}

using namespace Eigen;

typedef SCALAR Scalar;
typedef NumTraits<Scalar>::Real RealScalar;
typedef std::complex<RealScalar> Complex;

enum
{
  IsComplex = Eigen::NumTraits<SCALAR>::IsComplex,
  Conj = IsComplex
};

typedef Matrix<Scalar,Dynamic,Dynamic,ColMajor> PlainMatrixType;
typedef Map<Matrix<Scalar,Dynamic,Dynamic,ColMajor>, 0, OuterStride<> > MatrixType;
typedef Map<Matrix<Scalar,Dynamic,1>, 0, InnerStride<Dynamic> > StridedVectorType;
typedef Map<Matrix<Scalar,Dynamic,1> > CompactVectorType;

template<typename T>
Map<Matrix<T,Dynamic,Dynamic,ColMajor>, 0, OuterStride<> >
matrix(T* data, int rows, int cols, int stride)
{
  return Map<Matrix<T,Dynamic,Dynamic,ColMajor>, 0, OuterStride<> >(data, rows, cols, OuterStride<>(stride));
}

template<typename T>
Map<Matrix<T,Dynamic,1>, 0, InnerStride<Dynamic> > vector(T* data, int size, int incr)
{
  return Map<Matrix<T,Dynamic,1>, 0, InnerStride<Dynamic> >(data, size, InnerStride<Dynamic>(incr));
}

template<typename T>
Map<Matrix<T,Dynamic,1> > vector(T* data, int size)
{
  return Map<Matrix<T,Dynamic,1> >(data, size);
}

template<typename T>
T* get_compact_vector(T* x, int n, int incx)
{
  if(incx==1)
    return x;

  T* ret = new Scalar[n];
  if(incx<0) vector(ret,n) = vector(x,n,-incx).reverse();
  else       vector(ret,n) = vector(x,n, incx);
  return ret;
}

template<typename T>
T* copy_back(T* x_cpy, T* x, int n, int incx)
{
  if(x_cpy==x)
    return 0;

  if(incx<0) vector(x,n,-incx).reverse() = vector(x_cpy,n);
  else       vector(x,n, incx)           = vector(x_cpy,n);
  return x_cpy;
}

#define EIGEN_BLAS_FUNC(X) EIGEN_CAT(SCALAR_SUFFIX,X##_)

#endif // EIGEN_BLAS_COMMON_H
