!-----------------------------------------------------------------------
! 
! Header with common subroutine
! 
      include 't320-basis-f.h'
!
! Header with QFunctions
! 
      include 't510-operator-f.h'
!-----------------------------------------------------------------------
      program test
      implicit none
      include 'ceed/fortran.h'

      integer ceed,err,i
      integer stridesu(3)
      integer erestrictx,erestrictu,erestrictui
      integer bx,bu
      integer qf_setup,qf_mass
      integer op_setup,op_mass
      integer qdata,x,u,v
      integer nelem,p,q,d
      integer val,row,col,offset
      parameter(nelem=12)
      parameter(p=6)
      parameter(q=4)
      parameter(d=2)
      integer ndofs,nqpts,nx,ny
      parameter(nx=3)
      parameter(ny=2)
      parameter(ndofs=(nx*2+1)*(ny*2+1))
      parameter(nqpts=nelem*q)
      integer indx(nelem*p)
      real*8 arrx(d*ndofs)
      integer*8 voffset,xoffset

      real*8 qref(d*q)
      real*8 qweight(q)
      real*8 interp(p*q)
      real*8 grad(d*p*q)
      real*8 total

      real*8 hv(ndofs)

      character arg*32

      external setup,mass

      call getarg(1,arg)

      call ceedinit(trim(arg)//char(0),ceed,err)

      do i=0,ndofs-1
        arrx(i+1)=mod(i,(nx*2+1))
        arrx(i+1)=arrx(i+1)*(1.d0/(nx*2.d0))
        val=(i/(nx*2+1))
        arrx(i+1+ndofs)=val*(1.d0/(ny*2.d0))
      enddo
      do i=0,5
        col=mod(i,nx)
        row=i/nx
        offset=col*2+row*(nx*2+1)*2

        indx(i*2*p+1)=2+offset
        indx(i*2*p+2)=9+offset
        indx(i*2*p+3)=16+offset
        indx(i*2*p+4)=1+offset
        indx(i*2*p+5)=8+offset
        indx(i*2*p+6)=0+offset

        indx(i*2*p+7)=14+offset
        indx(i*2*p+8)=7+offset
        indx(i*2*p+9)=0+offset
        indx(i*2*p+10)=15+offset
        indx(i*2*p+11)=8+offset
        indx(i*2*p+12)=16+offset
      enddo

      call ceedelemrestrictioncreate(ceed,nelem,p,d,ndofs,d*ndofs,&
     & ceed_mem_host,ceed_use_pointer,indx,erestrictx,err)

      call ceedelemrestrictioncreate(ceed,nelem,p,1,1,ndofs,ceed_mem_host,&
     & ceed_use_pointer,indx,erestrictu,err)
      stridesu=[1,q,q]
      call ceedelemrestrictioncreatestrided(ceed,nelem,q,1,nqpts,stridesu,&
     & erestrictui,err)

      call buildmats(qref,qweight,interp,grad)
      call ceedbasiscreateh1(ceed,ceed_triangle,d,p,q,interp,grad,qref,qweight,&
     & bx,err)
      call buildmats(qref,qweight,interp,grad)
      call ceedbasiscreateh1(ceed,ceed_triangle,1,p,q,interp,grad,qref,qweight,&
     & bu,err)

      call ceedqfunctioncreateinterior(ceed,1,setup,&
     &SOURCE_DIR&
     &//'t510-operator.h:setup'//char(0),qf_setup,err)
      call ceedqfunctionaddinput(qf_setup,'_weight',1,ceed_eval_weight,err)
      call ceedqfunctionaddinput(qf_setup,'x',d*d,ceed_eval_grad,err)
      call ceedqfunctionaddoutput(qf_setup,'rho',1,ceed_eval_none,err)

      call ceedqfunctioncreateinterior(ceed,1,mass,&
     &SOURCE_DIR&
     &//'t510-operator.h:mass'//char(0),qf_mass,err)
      call ceedqfunctionaddinput(qf_mass,'rho',1,ceed_eval_none,err)
      call ceedqfunctionaddinput(qf_mass,'u',1,ceed_eval_interp,err)
      call ceedqfunctionaddoutput(qf_mass,'v',1,ceed_eval_interp,err)

      call ceedoperatorcreate(ceed,qf_setup,ceed_qfunction_none,&
     & ceed_qfunction_none,op_setup,err)
      call ceedoperatorcreate(ceed,qf_mass,ceed_qfunction_none,&
     & ceed_qfunction_none,op_mass,err)

      call ceedvectorcreate(ceed,d*ndofs,x,err)
      xoffset=0
      call ceedvectorsetarray(x,ceed_mem_host,ceed_use_pointer,arrx,xoffset,err)
      call ceedvectorcreate(ceed,nqpts,qdata,err)

      call ceedoperatorsetfield(op_setup,'_weight',ceed_elemrestriction_none,&
     & bx,ceed_vector_none,err)
      call ceedoperatorsetfield(op_setup,'x',erestrictx,bx,&
     & ceed_vector_active,err)
      call ceedoperatorsetfield(op_setup,'rho',erestrictui,&
     & ceed_basis_collocated,ceed_vector_active,err)
      call ceedoperatorsetfield(op_mass,'rho',erestrictui,&
     & ceed_basis_collocated,qdata,err)
      call ceedoperatorsetfield(op_mass,'u',erestrictu,bu,&
     & ceed_vector_active,err)
      call ceedoperatorsetfield(op_mass,'v',erestrictu,bu,&
     & ceed_vector_active,err)

      call ceedoperatorapply(op_setup,x,qdata,ceed_request_immediate,err)

      call ceedvectorcreate(ceed,ndofs,u,err)
      call ceedvectorsetvalue(u,1.d0,err)
      call ceedvectorcreate(ceed,ndofs,v,err)
      call ceedoperatorapply(op_mass,u,v,ceed_request_immediate,err)

      call ceedvectorgetarrayread(v,ceed_mem_host,hv,voffset,err)
      total=0.
      do i=1,ndofs
        total=total+hv(voffset+i)
      enddo
      if (abs(total-1.)>1.0d-10) then
! LCOV_EXCL_START
        write(*,*) 'Computed Area: ',total,' != True Area: 1.0'
! LCOV_EXCL_STOP
      endif
      call ceedvectorrestorearrayread(v,hv,voffset,err)

      call ceedvectordestroy(qdata,err)
      call ceedvectordestroy(x,err)
      call ceedvectordestroy(u,err)
      call ceedvectordestroy(v,err)
      call ceedoperatordestroy(op_mass,err)
      call ceedoperatordestroy(op_setup,err)
      call ceedqfunctiondestroy(qf_mass,err)
      call ceedqfunctiondestroy(qf_setup,err)
      call ceedbasisdestroy(bu,err)
      call ceedbasisdestroy(bx,err)
      call ceedelemrestrictiondestroy(erestrictu,err)
      call ceedelemrestrictiondestroy(erestrictx,err)
      call ceedelemrestrictiondestroy(erestrictui,err)
      call ceeddestroy(ceed,err)
      end
!-----------------------------------------------------------------------
