/*
    DFT++ is a density functional package developed by the research group
    of Professor Tomas Arias

    Copyright 1996-2003 Sohrab Ismail-Beigi

    This file is part of DFT++.

    DFT++ 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 2 of the License, or
    (at your option) any later version.

    DFT++ 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 DFT++; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Please see the file CREDITS for a list of authors.

    For academic users, we request that publications using results obtained with
    this software reference

    "New algebraic formulation of density functional calculation," by Sohrab Ismail-Beigi
    and T.A. Arias, Computer Physics Communications 128:1-2, 1-45 (June 2000).

    and, if using the wavelet basis, further reference

    "Multiresolution analysis of electronic structure: semicardinal and wavelet bases,"
    T.A. Arias, Reviews of Modern Physics 71:1, 267-311 (January 1999).

    and 

    "Robust ab initio calculation of condensed matter: transparent convergence through
    semicardinal multiresolution analysis,'' I.P. Daykov, T.A. Arias, and
    Torkel D. Engeness, Physical Review Letters, 90:21, 216402 (May 2003).

    For your convenience, preprints of the above articles may be obtained from
    http://arXiv.org/abs/cond-mat/9909130, 9805262, and 0204411, respectively.
*/

#ifndef DFT_WL_BASIS_H
#define DFT_WL_BASIS_H

class WL_BasisSpec
{
 public:
  Gridspec gridspec[NgridMx];
  Gridspec gridspec_dense[NgridMx];
  
  Lattice *lattice;

  int use_dense;

  //ipd: HACK
  // calls the old L/invL for orthorhombic cells, because the new
  // operators are much much slower
  int use_L_orthorhombic;
  
  // Needed for initialization from Everything
  void setup(Everything &e);

  // Needed for planewave compatibility.  Eliminate if possible!
  //ipd: the symmetries are holding it
  //int Nx, Ny, Nz, NxNyNz;
  int size_realgrid;
  
  int kpt_fold[3];

  //ipd: rename this to state_dep or k_dep, or whatever
  int basis_flag; // 0 for k-indep bases, 1 otherwise

  // Stores the gridspec filename.
  char filename[DFT_FILENAME_LEN];

  //WL_BasisSpec(char *filename); // specify a gridspec file
  WL_BasisSpec(); // default is "gridspec"
};

class WL_Basis
{
 public:
  WL_BasisSpec *basis_spec;  // points to global BasisSpec
  QuantumNumber *qnum;

  int nbasis;  // number of basis elements in the basis

  int lwork;  // stores the size of the workspace associated with this grid

  //ipd: this is part of BlochState
  //  double weight;
  //  int representation;

  WL_Basis();

  // Needed for compatibility with planewaves.  Might do something later.
  void setup_template(WL_BasisSpec &global_spec);
  void setup(const vector3 &kvec);

  
};

#endif // DFT_WL_BASIS_H