!> @file salsa_util_mod.f90
!--------------------------------------------------------------------------------!
! This file is part of PALM-4U.
!
! PALM-4U 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 3 of the License, or (at your option) any later 
! version.
!
! PALM-4U 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
! PALM. If not, see <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2019 Leibniz Universitaet Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
! 
! 
! Former revisions:
! -----------------
! $Id: salsa_util_mod.f90 3872 2019-04-08 15:03:06Z moh.hefny $
! moved decrlaration of sums_salsa_ws_l to statistics module
! 
! 3871 2019-04-08 14:38:39Z knoop
! Formatting changes
!
! 3845 2019-04-01 13:41:55Z monakurppa
! Initial revision
!
!
!
! Authors:
! --------
! @author monakurppa
!
!
! Description:
! ------------
!> Utility functions used in salsa_mod.
!------------------------------------------------------------------------------!
 MODULE salsa_util_mod

    USE control_parameters,                                                                        &
        ONLY:  message_string

    USE kinds

    USE pegrid

    IMPLICIT NONE
!
!-- Component index
    TYPE component_index
       INTEGER(iwp) ::  ncomp  !< Number of components
       INTEGER(iwp), ALLOCATABLE ::  ind(:)  !< Component index
       CHARACTER(len=3), ALLOCATABLE ::  comp(:)  !< Component name
    END TYPE component_index

    SAVE

    INTERFACE component_index_constructor
       MODULE PROCEDURE component_index_constructor
    END INTERFACE component_index_constructor

    INTERFACE get_index
       MODULE PROCEDURE get_index
    END INTERFACE get_index

    INTERFACE is_used
       MODULE PROCEDURE is_used
    END INTERFACE is_used

    PRIVATE
    PUBLIC component_index, component_index_constructor, get_index, is_used

 CONTAINS

!------------------------------------------------------------------------------!
! Description:
! ------------
!> Creates index tables for different (aerosol) components 
!------------------------------------------------------------------------------!
    SUBROUTINE component_index_constructor( self, ncomp, nlist, listcomp )

       IMPLICIT NONE

       INTEGER(iwp) ::  i   !<
       INTEGER(iwp) ::  jj  !<

       INTEGER(iwp), INTENT(in) ::  nlist ! < Maximum number of components

       INTEGER(iwp), INTENT(inout) ::  ncomp  !< Number of components

       TYPE(component_index), INTENT(inout) ::  self  !< Object containing the indices of different
                                                      !< aerosol components
       CHARACTER(len=3), INTENT(in) ::  listcomp(nlist)  !< List cof component names

       ncomp = 0

       DO WHILE ( listcomp(ncomp+1) /= '  ' .AND. ncomp < nlist )
          ncomp = ncomp + 1
       ENDDO

       self%ncomp = ncomp
       ALLOCATE( self%ind(ncomp), self%comp(ncomp) )

       DO  i = 1, ncomp
          self%ind(i) = i
       ENDDO

       jj = 1
       DO  i = 1, nlist
          IF ( listcomp(i) == '') CYCLE
          self%comp(jj) = listcomp(i)
          jj = jj + 1
       ENDDO

    END SUBROUTINE component_index_constructor

!------------------------------------------------------------------------------!
! Description:
! ------------
!> Gives the index of a component in the component list
!------------------------------------------------------------------------------!
    INTEGER FUNCTION get_index( self, incomp )

       IMPLICIT NONE

       CHARACTER(len=*), INTENT(in) ::  incomp !< Component name
       INTEGER(iwp) ::  i

       TYPE(component_index), INTENT(in) ::  self  !< Object containing the indices of different
                                                   !< aerosol components
       IF ( ANY( self%comp == incomp ) ) THEN
          i = 1
          DO WHILE ( (self%comp(i) /= incomp) )
             i = i + 1
          ENDDO
          get_index = i
       ELSEIF ( incomp == 'H2O' ) THEN
          get_index = self%ncomp + 1
       ELSE
          WRITE( message_string, * ) 'Incorrect component name given!'
          CALL message( 'get_index', 'PA0591', 1, 2, 0, 6, 0 )
       ENDIF

       RETURN

    END FUNCTION get_index

!------------------------------------------------------------------------------!
! Description:
! ------------
!> Tells if the (aerosol) component is being used in the simulation
!------------------------------------------------------------------------------!
    LOGICAL FUNCTION is_used( self, icomp )

       IMPLICIT NONE

       CHARACTER(len=*), INTENT(in) ::  icomp !< Component name

       TYPE(component_index), INTENT(in) ::  self  !< Object containing the indices of different
                                                   !< aerosol components

       IF ( ANY(self%comp == icomp) ) THEN
          is_used = .TRUE.
       ELSE
          is_used = .FALSE.
       ENDIF

    END FUNCTION

 END MODULE salsa_util_mod