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!--------------------------------------------------------------------------------
! Copyright (c) 2016 Peter Grünberg Institut, Forschungszentrum Jülich, Germany
! This file is part of FLEUR and available as free software under the conditions
! of the MIT license as expressed in the LICENSE file in more detail.
!--------------------------------------------------------------------------------
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!> This module defines two data-types used in the calculation of xc-potentials
!! a) the abstract t_xcpot which should be overwritten for actual implementations
!! b) the t_gradients that collects the gradients needed in GGAs
!!
!! Currently t_xcpot_inbuild implements the XC-pots directly build into FLEUR
!! and t_xcpot_libxc provides and interface to libxc.
!! In addition to overloading the t_xcpot datatype also mpi_bc_xcpot must be adjusted
!! for additional implementations.
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MODULE m_types_xcpot
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   IMPLICIT NONE
   PRIVATE
   PUBLIC :: t_xcpot,t_gradients

   TYPE,ABSTRACT :: t_xcpot
      REAL :: gmaxxc
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   CONTAINS
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      PROCEDURE        :: vxc_is_gga=>xcpot_vxc_is_gga
      PROCEDURE        :: exc_is_gga=>xcpot_exc_is_gga
      PROCEDURE        :: exc_is_MetaGGA=>xcpot_exc_is_MetaGGA
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      PROCEDURE        :: needs_grad=>xcpot_needs_grad
      PROCEDURE        :: is_hybrid=>xcpot_is_hybrid
      PROCEDURE        :: get_exchange_weight=>xcpot_get_exchange_weight
      PROCEDURE        :: get_vxc=>xcpot_get_vxc
      PROCEDURE        :: get_exc=>xcpot_get_exc
      PROCEDURE,NOPASS :: alloc_gradients=>xcpot_alloc_gradients
   END TYPE t_xcpot
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   TYPE t_gradients
      !Naming convention:
      !t,u,d as last letter for total,up,down
      !agr for absolute value of gradient
      !g2r for laplacien of gradient
      !+??
      REAL,ALLOCATABLE :: agrt(:),agru(:),agrd(:)
      REAL,ALLOCATABLE :: g2ru(:),g2rd(:),gggrt(:)
      REAL,ALLOCATABLE :: gggru(:),gzgr(:),g2rt(:)
      REAL,ALLOCATABLE :: gggrd(:),grgru(:),grgrd(:)
      !These are the contracted Gradients used in libxc
      REAL,ALLOCATABLE :: sigma(:,:)
      REAL,ALLOCATABLE :: vsigma(:,:)
      REAL,ALLOCATABLE :: gr(:,:,:)
      REAL,ALLOCATABLE :: laplace(:,:)
   END TYPE t_gradients
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CONTAINS
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   LOGICAL FUNCTION xcpot_vxc_is_gga(xcpot)
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      IMPLICIT NONE
      CLASS(t_xcpot),INTENT(IN):: xcpot
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      xcpot_vxc_is_gga=.false.
   END FUNCTION xcpot_vxc_is_gga
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   LOGICAL FUNCTION xcpot_exc_is_gga(xcpot)
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      IMPLICIT NONE
      CLASS(t_xcpot),INTENT(IN):: xcpot
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      xcpot_exc_is_gga=.false.
   END FUNCTION xcpot_exc_is_gga

   LOGICAL FUNCTION xcpot_exc_is_MetaGGA(xcpot)
      IMPLICIT NONE
      CLASS(t_xcpot),INTENT(IN):: xcpot
      xcpot_exc_is_MetaGGA=.false.
   END FUNCTION xcpot_exc_is_MetaGGA
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   LOGICAL FUNCTION xcpot_needs_grad(xcpot)
      IMPLICIT NONE
      CLASS(t_xcpot),INTENT(IN):: xcpot
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      xcpot_needs_grad= xcpot%vxc_is_gga()
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   END FUNCTION xcpot_needs_grad
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   LOGICAL FUNCTION xcpot_is_hybrid(xcpot)
      IMPLICIT NONE
      CLASS(t_xcpot),INTENT(IN):: xcpot
      xcpot_is_hybrid=.FALSE.
   END FUNCTION xcpot_is_hybrid
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   FUNCTION xcpot_get_exchange_weight(xcpot) RESULT(a_ex)
      USE m_judft
      IMPLICIT NONE
      CLASS(t_xcpot),INTENT(IN):: xcpot
      REAL:: a_ex
      a_ex=-1
   END FUNCTION xcpot_get_exchange_weight
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   SUBROUTINE xcpot_get_vxc(xcpot,jspins,rh,vxc,vx,grad)
      CLASS(t_xcpot),INTENT(IN) :: xcpot
      INTEGER, INTENT (IN)     :: jspins
      !--> charge density
      REAL,INTENT (IN)         :: rh(:,:)
      !---> xc potential
      REAL, INTENT (OUT)       :: vxc (:,:),vx(:,:)
      TYPE(t_gradients),OPTIONAL,INTENT(INOUT)::grad
   END SUBROUTINE xcpot_get_vxc
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   SUBROUTINE xcpot_get_exc(xcpot,jspins,rh,exc,grad)
      CLASS(t_xcpot),INTENT(IN) :: xcpot
      INTEGER, INTENT (IN)     :: jspins
      !--> charge density
      REAL,INTENT (IN)         :: rh(:,:)
      !---> xc energy density
      REAL, INTENT (OUT)       :: exc (:)
      TYPE(t_gradients),OPTIONAL,INTENT(IN)::grad
   END SUBROUTINE xcpot_get_exc
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   SUBROUTINE xcpot_alloc_gradients(ngrid,jspins,grad)
      INTEGER, INTENT (IN)         :: jspins,ngrid
      TYPE(t_gradients),INTENT(INOUT):: grad
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      IF (allocated(grad%agrt)) THEN
         DEALLOCATE(grad%agrt,grad%agru,grad%agrd)
         DEALLOCATE(grad%g2ru,grad%g2rd,grad%gggrt)
         DEALLOCATE(grad%gggru,grad%gzgr,grad%g2rt)
         DEALLOCATE(grad%gggrd,grad%grgru,grad%grgrd)
      ENDIF
      !For the in-build xc-pots
      ALLOCATE(grad%agrt(ngrid),grad%agru(ngrid),grad%agrd(ngrid))
      ALLOCATE(grad%g2ru(ngrid),grad%g2rd(ngrid),grad%gggrt(ngrid))
      ALLOCATE(grad%gggru(ngrid),grad%gzgr(ngrid),grad%g2rt(ngrid))
      ALLOCATE(grad%gggrd(ngrid),grad%grgru(ngrid),grad%grgrd(ngrid))
   END SUBROUTINE xcpot_alloc_gradients
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END MODULE m_types_xcpot