#ifndef GRID_LATTICE_ARITH_H
#define GRID_LATTICE_ARITH_H

namespace Grid {

  //////////////////////////////////////////////////////////////////////////////////////////////////////
  // unary negation
  //////////////////////////////////////////////////////////////////////////////////////////////////////
  template<class vobj>
  inline Lattice<vobj> operator -(const Lattice<vobj> &r)
  {
    Lattice<vobj> ret(r._grid);
#pragma omp parallel for
    for(int ss=0;ss<r._grid->oSites();ss++){
      vstream(ret._odata[ss], -r._odata[ss]);
    }
    return ret;
  }

  //////////////////////////////////////////////////////////////////////////////////////////////////////
  //  avoid copy back routines for mult, mac, sub, add
  //////////////////////////////////////////////////////////////////////////////////////////////////////
  template<class obj1,class obj2,class obj3>
    void mult(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const Lattice<obj3> &rhs){
    conformable(lhs,rhs);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      mult(&tmp,&lhs._odata[ss],&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  template<class obj1,class obj2,class obj3>
    void mac(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const Lattice<obj3> &rhs){
    conformable(lhs,rhs);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      mac(&tmp,&lhs._odata[ss],&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  template<class obj1,class obj2,class obj3>
    void sub(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const Lattice<obj3> &rhs){
    conformable(lhs,rhs);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      sub(&tmp,&lhs._odata[ss],&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  template<class obj1,class obj2,class obj3>
    void add(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const Lattice<obj3> &rhs){
    conformable(lhs,rhs);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      add(&tmp,&lhs._odata[ss],&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  //////////////////////////////////////////////////////////////////////////////////////////////////////
  //  avoid copy back routines for mult, mac, sub, add
  //////////////////////////////////////////////////////////////////////////////////////////////////////
  template<class obj1,class obj2,class obj3>
    void mult(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const obj3 &rhs){
    conformable(lhs,ret);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      mult(&tmp,&lhs._odata[ss],&rhs);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  template<class obj1,class obj2,class obj3>
    void mac(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const obj3 &rhs){
    conformable(lhs,ret);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      mac(&tmp,&lhs._odata[ss],&rhs);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  template<class obj1,class obj2,class obj3>
    void sub(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const obj3 &rhs){
    conformable(lhs,ret);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      sub(&tmp,&lhs._odata[ss],&rhs);
      vstream(ret._odata[ss],tmp);
    }
  }
  template<class obj1,class obj2,class obj3>
    void add(Lattice<obj1> &ret,const Lattice<obj2> &lhs,const obj3 &rhs){
    conformable(lhs,ret);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      obj1 tmp;
      add(&tmp,&lhs._odata[ss],&rhs);
      vstream(ret._odata[ss],tmp);
    }
  }

  //////////////////////////////////////////////////////////////////////////////////////////////////////
  //  avoid copy back routines for mult, mac, sub, add
  //////////////////////////////////////////////////////////////////////////////////////////////////////
    template<class obj1,class obj2,class obj3>
    void mult(Lattice<obj1> &ret,const obj2 &lhs,const Lattice<obj3> &rhs){
    conformable(ret,rhs);
#pragma omp parallel for
    for(int ss=0;ss<rhs._grid->oSites();ss++){
      obj1 tmp;
      mult(&tmp,&lhs,&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  template<class obj1,class obj2,class obj3>
    void mac(Lattice<obj1> &ret,const obj2 &lhs,const Lattice<obj3> &rhs){
    conformable(ret,rhs);
#pragma omp parallel for
    for(int ss=0;ss<rhs._grid->oSites();ss++){
      obj1 tmp;
      mac(&tmp,&lhs,&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  template<class obj1,class obj2,class obj3>
    void sub(Lattice<obj1> &ret,const obj2 &lhs,const Lattice<obj3> &rhs){
    conformable(ret,rhs);
#pragma omp parallel for
    for(int ss=0;ss<rhs._grid->oSites();ss++){
      obj1 tmp;
      sub(&tmp,&lhs,&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  template<class obj1,class obj2,class obj3>
    void add(Lattice<obj1> &ret,const obj2 &lhs,const Lattice<obj3> &rhs){
    conformable(ret,rhs);
#pragma omp parallel for
    for(int ss=0;ss<rhs._grid->oSites();ss++){
      obj1 tmp;
      add(&tmp,&lhs,&rhs._odata[ss]);
      vstream(ret._odata[ss],tmp);
    }
  }
  
  /////////////////////////////////////////////////////////////////////////////////////
  // Lattice BinOp Lattice,
  //NB mult performs conformable check. Do not reapply here for performance.
  /////////////////////////////////////////////////////////////////////////////////////
  template<class left,class right>
    inline auto operator * (const Lattice<left> &lhs,const Lattice<right> &rhs)-> Lattice<decltype(lhs._odata[0]*rhs._odata[0])>
  {
    Lattice<decltype(lhs._odata[0]*rhs._odata[0])> ret(rhs._grid);
    mult(ret,lhs,rhs);
    return ret;
  }
  template<class left,class right>
    inline auto operator + (const Lattice<left> &lhs,const Lattice<right> &rhs)-> Lattice<decltype(lhs._odata[0]+rhs._odata[0])>
  {
    Lattice<decltype(lhs._odata[0]+rhs._odata[0])> ret(rhs._grid);
    add(ret,lhs,rhs);
    return ret;
  }
  template<class left,class right>
    inline auto operator - (const Lattice<left> &lhs,const Lattice<right> &rhs)-> Lattice<decltype(lhs._odata[0]-rhs._odata[0])>
  {
    Lattice<decltype(lhs._odata[0]-rhs._odata[0])> ret(rhs._grid);
    sub(ret,lhs,rhs);
    return ret;
  }
  
  // Scalar BinOp Lattice ;generate return type
  template<class left,class right>
    inline auto operator * (const left &lhs,const Lattice<right> &rhs) -> Lattice<decltype(lhs*rhs._odata[0])>
  {
    Lattice<decltype(lhs*rhs._odata[0])> ret(rhs._grid);
#pragma omp parallel for
    for(int ss=0;ss<rhs._grid->oSites(); ss++){
      decltype(lhs*rhs._odata[0]) tmp=lhs*rhs._odata[ss]; 
      vstream(ret._odata[ss],tmp);
	   //      ret._odata[ss]=lhs*rhs._odata[ss];
    }
    return ret;
  }
  template<class left,class right>
    inline auto operator + (const left &lhs,const Lattice<right> &rhs) -> Lattice<decltype(lhs+rhs._odata[0])>
    {
      Lattice<decltype(lhs+rhs._odata[0])> ret(rhs._grid);
#pragma omp parallel for
      for(int ss=0;ss<rhs._grid->oSites(); ss++){
	decltype(lhs+rhs._odata[0]) tmp =lhs-rhs._odata[ss];  
	vstream(ret._odata[ss],tmp);
	//	ret._odata[ss]=lhs+rhs._odata[ss];
      }
        return ret;
    }
  template<class left,class right>
    inline auto operator - (const left &lhs,const Lattice<right> &rhs) -> Lattice<decltype(lhs-rhs._odata[0])>
  {
    Lattice<decltype(lhs-rhs._odata[0])> ret(rhs._grid);
#pragma omp parallel for
    for(int ss=0;ss<rhs._grid->oSites(); ss++){
      decltype(lhs-rhs._odata[0]) tmp=lhs-rhs._odata[ss];  
      vstream(ret._odata[ss],tmp);
      //      ret._odata[ss]=lhs-rhs._odata[ss];
    }
    return ret;
  }
    template<class left,class right>
      inline auto operator * (const Lattice<left> &lhs,const right &rhs) -> Lattice<decltype(lhs._odata[0]*rhs)>
    {
      Lattice<decltype(lhs._odata[0]*rhs)> ret(lhs._grid);
#pragma omp parallel for
      for(int ss=0;ss<lhs._grid->oSites(); ss++){
	decltype(lhs._odata[0]*rhs) tmp =lhs._odata[ss]*rhs;
	vstream(ret._odata[ss],tmp);
	//            ret._odata[ss]=lhs._odata[ss]*rhs;
      }
      return ret;
    }
    template<class left,class right>
      inline auto operator + (const Lattice<left> &lhs,const right &rhs) -> Lattice<decltype(lhs._odata[0]+rhs)>
    {
        Lattice<decltype(lhs._odata[0]+rhs)> ret(lhs._grid);
#pragma omp parallel for
        for(int ss=0;ss<rhs._grid->oSites(); ss++){
	  decltype(lhs._odata[0]+rhs) tmp=lhs._odata[ss]+rhs; 
	  vstream(ret._odata[ss],tmp);
	  //	  ret._odata[ss]=lhs._odata[ss]+rhs;
        }
        return ret;
    }
    template<class left,class right>
      inline auto operator - (const Lattice<left> &lhs,const right &rhs) -> Lattice<decltype(lhs._odata[0]-rhs)>
    {
      Lattice<decltype(lhs._odata[0]-rhs)> ret(lhs._grid);
#pragma omp parallel for
      for(int ss=0;ss<rhs._grid->oSites(); ss++){
	  decltype(lhs._odata[0]-rhs) tmp=lhs._odata[ss]-rhs;
	  vstream(ret._odata[ss],tmp);
	  //	ret._odata[ss]=lhs._odata[ss]-rhs;
      }
      return ret;
    }

  template<class sobj,class vobj>
  inline void axpy(Lattice<vobj> &ret,sobj a,const Lattice<vobj> &lhs,const Lattice<vobj> &rhs){
    conformable(lhs,rhs);
#pragma omp parallel for
    for(int ss=0;ss<lhs._grid->oSites();ss++){
      vobj tmp = a*lhs._odata[ss];
      vstream(ret._odata[ss],tmp+rhs._odata[ss]);
    }
  }

}
#endif