/*************************************************************************************

Grid physics library, www.github.com/paboyle/Grid

Source file: ./lib/lattice/Lattice_base.h

Copyright (C) 2015

Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: paboyle <paboyle@ph.ed.ac.uk>

This program 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.

This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

See the full license in the file "LICENSE" in the top level distribution
directory
*************************************************************************************/
			   /*  END LEGAL */
#pragma once 

#define STREAMING_STORES

NAMESPACE_BEGIN(Grid);

// TODO: 
//       mac,real,imag

// Functionality:
//     -=,+=,*=,()
//     add,+,sub,-,mult,mac,*
//     adj,conjugate
//     real,imag
//     transpose,transposeIndex  
//     trace,traceIndex
//     peekIndex
//     innerProduct,outerProduct,
//     localNorm2
//     localInnerProduct

extern int GridCshiftPermuteMap[4][16];

////////////////////////////////////////////////
// Basic expressions used in Expression Template
////////////////////////////////////////////////

// The data inside the lattice class
class LatticeBase {};

template<class vobj> class LatticeAccelerator : public LatticeBase
{
protected:
  int checkerboard;
  vobj     *_odata;    // A managed pointer
  uint64_t _odata_size;    
  //  virtual ~LatticeBase(void) = default;
public:
  accelerator_inline LatticeAccelerator() : checkerboard(0), _odata(nullptr), _odata_size(0) {
    //    std::cout << " Lattice accelerator object "<<this->_odata<<" size "<<this->_odata_size<<std::endl;
  }; 
  accelerator_inline int      Checkerboard(void) const { return checkerboard; };
  accelerator_inline int     &Checkerboard(void) { return checkerboard; };
  accelerator_inline uint64_t begin(void) const { return 0;};
  accelerator_inline uint64_t end(void)   const { return _odata_size; };
  accelerator_inline uint64_t size(void)   const { return _odata_size; };
  accelerator_inline vobj & operator[](size_t i)             { return _odata[i]; };
  accelerator_inline const vobj & operator[](size_t i) const { return _odata[i]; };

};
    
class LatticeExpressionBase {};

template <typename Op, typename T1>                           
class LatticeUnaryExpression  : public std::pair<Op,std::tuple<T1> > , public LatticeExpressionBase {
public:
  LatticeUnaryExpression(const std::pair<Op,std::tuple<T1> > &arg): std::pair<Op,std::tuple<T1> >(arg) {};
};

template <typename Op, typename T1, typename T2>              
class LatticeBinaryExpression : public std::pair<Op,std::tuple<T1,T2> > , public LatticeExpressionBase {
public:
  LatticeBinaryExpression(const std::pair<Op,std::tuple<T1,T2> > &arg): std::pair<Op,std::tuple<T1,T2> >(arg) {};
};

template <typename Op, typename T1, typename T2, typename T3> 
class LatticeTrinaryExpression :public std::pair<Op,std::tuple<T1,T2,T3> >, public LatticeExpressionBase {
public:
  LatticeTrinaryExpression(const std::pair<Op,std::tuple<T1,T2,T3> > &arg): std::pair<Op,std::tuple<T1,T2,T3> >(arg) {};
};

void inline conformable(GridBase *lhs,GridBase *rhs)
{
  assert(lhs == rhs);
}

template<class vobj>
class Lattice : public LatticeAccelerator<vobj>
{
protected: // Move to private and fix
  GridBase *_grid;
public:
  GridBase *Grid(void) const { return _grid; }
  ///////////////////////////////////////////////////
  // Member types
  ///////////////////////////////////////////////////
  typedef typename vobj::scalar_type scalar_type;
  typedef typename vobj::vector_type vector_type;
  typedef vobj vector_object;

private:
  void dealloc(void)
  {
    alignedAllocator<vobj> alloc;
    //    std::cout << " deallocating lattice "<<this << " odata " <<this->_odata<<" size "<<this->_odata_size<<std::endl;
    //    //    BACKTRACE();
    if( this->_odata_size ) {
      alloc.deallocate(this->_odata,this->_odata_size);
      this->_odata=nullptr;
      this->_odata_size=0;
    }
  }
  void resize(uint64_t size)
  {
    alignedAllocator<vobj> alloc;
    if ( this->_odata_size != size ) {
      dealloc();
    }
    this->_odata_size = size;
    if ( size ) 
      this->_odata      = alloc.allocate(this->_odata_size);
    else 
      this->_odata      = nullptr;

    //    std::cout << " allocated lattice "<<this << " odata " <<this->_odata<<" size "<<this->_odata_size<<std::endl;
    //    //    BACKTRACE();
  }
  void copy_vec(vobj *ptr,uint64_t count)
  {
    dealloc();
    this->_odata = ptr;
    assert(this->_odata_size == count);
    //    std::cout << " copied lattice "<<this->_odata<<" size "<<this->_odata_size<<std::endl;
  }
public:
  ~Lattice() { 
    if ( this->_odata_size ) {
      //      std::cout << " deleting lattice this"<<this << " odata " <<this->_odata<<" size "<<this->_odata_size<<std::endl;
      //      //      BACKTRACE();
      dealloc();
      //      std::cout << " deleted  lattice this"<<this<< " odata "<<this->_odata<<" size "<<this->_odata_size<<std::endl;
    }
   }
  ////////////////////////////////////////////////////////////////////////////////
  // Expression Template closure support
  ////////////////////////////////////////////////////////////////////////////////
  template <typename Op, typename T1>                         inline Lattice<vobj> & operator=(const LatticeUnaryExpression<Op,T1> &expr)
  {
    GridBase *egrid(nullptr);
    GridFromExpression(egrid,expr);
    assert(egrid!=nullptr);
    conformable(_grid,egrid);

    int cb=-1;
    CBFromExpression(cb,expr);
    assert( (cb==Odd) || (cb==Even));
    this->checkerboard=cb;

#ifdef STREAMING_STORES
    accelerator_loop(ss,(*this),{
      vobj tmp = eval(ss,expr);
      vstream(this->_odata[ss] ,tmp);
    });
#else
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=eval(ss,expr);
    });
#endif
    return *this;
  }
  template <typename Op, typename T1,typename T2> inline Lattice<vobj> & operator=(const LatticeBinaryExpression<Op,T1,T2> &expr)
  {
    GridBase *egrid(nullptr);
    GridFromExpression(egrid,expr);
    assert(egrid!=nullptr);
    conformable(_grid,egrid);

    int cb=-1;
    CBFromExpression(cb,expr);
    assert( (cb==Odd) || (cb==Even));
    this->checkerboard=cb;

#ifdef STREAMING_STORES
    accelerator_loop(ss,(*this),{
      vobj tmp = eval(ss,expr);
      vstream(this->_odata[ss] ,tmp);
    });
#else
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=eval(ss,expr);
    });
#endif
    return *this;
  }
  template <typename Op, typename T1,typename T2,typename T3> inline Lattice<vobj> & operator=(const LatticeTrinaryExpression<Op,T1,T2,T3> &expr)
  {
    GridBase *egrid(nullptr);
    GridFromExpression(egrid,expr);
    assert(egrid!=nullptr);
    conformable(_grid,egrid);

    int cb=-1;
    CBFromExpression(cb,expr);
    assert( (cb==Odd) || (cb==Even));
    this->checkerboard=cb;

#ifdef STREAMING_STORES
    accelerator_loop(ss,(*this),{
      vobj tmp = eval(ss,expr);
      vstream(this->_odata[ss] ,tmp);
    });
#else
    accelerator_loop(ss,(*this),{
      this->_odata[ss] = eval(ss,expr);
    });
#endif
    return *this;
  }
  //GridFromExpression is tricky to do
  template<class Op,class T1>
  Lattice(const LatticeUnaryExpression<Op,T1> & expr) {
    _grid = nullptr;
    GridFromExpression(_grid,expr);
    assert(_grid!=nullptr);

    int cb=-1;
    CBFromExpression(cb,expr);
    assert( (cb==Odd) || (cb==Even));
    this->checkerboard=cb;

    resize(_grid->oSites());
#ifdef STREAMING_STORES
    accelerator_loop(ss,(*this),{
      vstream(this->_odata[ss] ,eval(ss,expr));
    });
#else
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=eval(ss,expr);
    });
#endif
  }
  template<class Op,class T1, class T2>
  Lattice(const LatticeBinaryExpression<Op,T1,T2> & expr) {
    _grid = nullptr;
    GridFromExpression(_grid,expr);
    assert(_grid!=nullptr);
    resize(_grid->oSites());

    int cb=-1;
    CBFromExpression(cb,expr);
    assert( (cb==Odd) || (cb==Even));
    this->checkerboard=cb;
    
#ifdef STREAMING_STORES
    accelerator_loop(ss,(*this),{
      vobj tmp = eval(ss,expr);
      vstream(this->_odata[ss] ,tmp);
    });
#else
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=eval(ss,expr);
    });
#endif
  }
  template<class Op,class T1, class T2, class T3>
  Lattice(const LatticeTrinaryExpression<Op,T1,T2,T3> & expr) {
    _grid = nullptr;
    GridFromExpression(_grid,expr);
    assert(_grid!=nullptr);

    int cb=-1;
    CBFromExpression(cb,expr);
    assert( (cb==Odd) || (cb==Even));
    this->checkerboard=cb;

    resize(_grid->oSites());
    accelerator_loop(ss,(*this),{
      vstream(this->_odata[ss] ,eval(ss,expr));
    });
  }

  //  virtual ~Lattice(void) = default;
  /*
  void reset(GridBase* grid) {
    if (_grid != grid) {
      _grid = grid;
      resize(grid->oSites());
      this->checkerboard = 0;
    }
  }
  */  

  template<class sobj> inline Lattice<vobj> & operator = (const sobj & r){
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=r;
    });
    return *this;
  }

  //////////////////////////////////////////////////////////////////
  // Follow rule of five, with Constructor requires "grid" passed
  // to user defined constructor
  //////////////////////////////////////////////////////////////////
  Lattice(GridBase *grid) { // user defined constructor
    _grid = grid;
    //    std::cout << "Lattice constructor(grid)"<<std::endl; 
    resize(grid->oSites());
    assert((((uint64_t)&this->_odata[0])&0xF) ==0);
    this->checkerboard=0;
  }
  Lattice(const Lattice& r){ // copy constructor
    //    std::cout << "Lattice constructor(const Lattice &) "<<this<<std::endl; 
    _grid = r.Grid();
    resize(r._odata_size);
    this->checkerboard = r.Checkerboard();
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=r[ss];
    });
  }
  Lattice(Lattice && r){ // move constructor
    //    std::cout << "Lattice move constructor(Lattice &) "<<this<<std::endl; 
    _grid = r.Grid();
    this->_odata      = r._odata;
    this->_odata_size = r._odata_size;
    this->checkerboard= r.Checkerboard();
    r._odata      = nullptr;
    r._odata_size = 0;
  }
  // assignment template
  template<class robj> inline Lattice<vobj> & operator = (const Lattice<robj> & r){
    //    std::cout << "Lattice = (Lattice &)"<<std::endl; 
    typename std::enable_if<!std::is_same<robj,vobj>::value,int>::type i=0;
    this->checkerboard = r.Checkerboard();
    conformable(*this,r);
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=r[ss];
    });
    return *this;
  }
  // Copy assignment 
  inline Lattice<vobj> & operator = (const Lattice<vobj> & r){
    //    std::cout << "Lattice = (Lattice &)"<<std::endl; 
    this->checkerboard = r.Checkerboard();
    conformable(*this,r);
    accelerator_loop(ss,(*this),{
      this->_odata[ss]=r[ss];
    });
    return *this;
  }
  // Move assignment if same type
  inline Lattice<vobj> & operator = (Lattice<vobj> && r){
    //    std::cout << "Lattice = (Lattice &&)"<<std::endl; 
    resize(0); // delete if appropriate

    this->_grid        = r.Grid();
    this->checkerboard = r.Checkerboard();

    this->_odata      = r._odata;
    this->_odata_size = r._odata_size;
    this->checkerboard= r.Checkerboard();

    r._odata      = nullptr;
    r._odata_size = 0;
    
    return *this;
  }
  
  // *=,+=,-= operators inherit behvour from correspond */+/- operation
  template<class T> inline Lattice<vobj> &operator *=(const T &r) {
    *this = (*this)*r;
    return *this;
  }
  
  template<class T> inline Lattice<vobj> &operator -=(const T &r) {
    *this = (*this)-r;
    return *this;
  }
  template<class T> inline Lattice<vobj> &operator +=(const T &r) {
    *this = (*this)+r;
    return *this;
  }

  friend inline void swap(Lattice &l, Lattice &r) { 
    conformable(l,r);
    LatticeAccelerator<vobj> tmp;
    LatticeAccelerator<vobj> *lp = (LatticeAccelerator<vobj> *)&l;
    LatticeAccelerator<vobj> *rp = (LatticeAccelerator<vobj> *)&r;
    tmp = *lp;    *lp=*rp;    *rp=tmp;
  }


}; // class Lattice

template<class vobj> std::ostream& operator<< (std::ostream& stream, const Lattice<vobj> &o){
  std::vector<int> gcoor;
  typedef typename vobj::scalar_object sobj;
  sobj ss;
  for(int g=0;g<o.Grid()->_gsites;g++){
    o.Grid()->GlobalIndexToGlobalCoor(g,gcoor);
    peekSite(ss,o,gcoor);
    stream<<"[";
    for(int d=0;d<gcoor.size();d++){
      stream<<gcoor[d];
      if(d!=gcoor.size()-1) stream<<",";
    }
    stream<<"]\t";
    stream<<ss<<std::endl;
  }
  return stream;
}
  
NAMESPACE_END(Grid);