!> subroutine dat2netcdf
!! convertion of a ZBL file to an netcdf one
!! @param  nxx                dimension along x
!! @param  nyy                dimension along y
!! @param  filename           
!! @return Tab                the value of Tab(nxx,nyy): Warning it is a real

subroutine dat2netcdf(nxx,nyy,numcol,base_name,filename,fil_sortie)

  use netcdf
  use io_netcdf_grisli
  implicit none
  integer,intent(in)  :: nxx                    !< dimension along x
  integer,intent(in)  :: nyy                    !< dimension along y
  integer,intent(in)  :: numcol                 !< column number 
  character(len=*), intent(in) :: base_name     !< base name of the variable to write
  character(len=20) :: base_name1               !< base name of the variable to write
  character(len=*),intent(in) :: filename       !< name of the file
  character(len=*)::fil_sortie
  real*8,dimension(:,:),pointer :: Tab1,Tab2,Tab3    !< the array that is read and returned
  integer  :: i,j                !< working integers
  integer  :: lx,ly              !< nxx, nyy read in the file
  real,dimension(3) :: a         !< working tab
  logical,save :: init
  integer ncid1,status1
  character(len=20),dimension(2) :: dimnames2d        !< dimensions pour netcdf pour tableau 2d

  if ((index(filename,'no') .eq. 0)) then

     if (.not. init) then
        status1  = nf90_create(trim(fil_sortie),NF90_WRITE,ncid1)    ! ouverture du fichier
        status1  = nf90_close(ncid1)                                 ! fermeture
        call init_ncdf(nxx,nyy,fil_sortie,dimnames2d)
        init= .true.
     end if


     open(22,file=trim(filename))
     read(22,*) lx,ly

     if ((lx.ne.nxx).or.(ly.ne.nyy)) then
        write(6,*) 'wrong dimension of the file', filename
        write(6,*) 'in the file',lx,ly
        write(6,*) 'should be',nxx,nyy
        stop
     end if

     if (numcol .eq. 1) then
        allocate(Tab1(nxx,nyy))
        do j=1,nyy
           do i=1,nxx
              read(22,*) a(1)
              Tab1(i,j)=a(1)
           end do
        end do
        base_name1= trim(base_name)//'_1'
        call Write_Ncdf_var(base_name1,dimnames2d,trim(fil_sortie),Tab1,'double')
        deallocate(Tab1)
     endif

     if (numcol .eq. 2) then
        allocate(Tab1(nxx,nyy),Tab2(nxx,nyy))
        do j=1,nyy
           do i=1,nxx
              read(22,*) a(1),a(2)
              Tab1(i,j)=a(1)
              Tab2(i,j)=a(2)
           end do
        end do
        base_name1= trim(base_name)//'_1'
        call Write_Ncdf_var(base_name1,dimnames2d,trim(fil_sortie),Tab1,'double')
        base_name1=trim(base_name)//'_2'
        call Write_Ncdf_var(base_name1,dimnames2d,trim(fil_sortie),Tab2,'double')
        deallocate(Tab1,Tab2)
     endif

     if (numcol .eq. 3) then
        allocate(Tab1(nxx,nyy),Tab2(nxx,nyy),Tab3(nxx,nyy))
        do j=1,nyy
           do i=1,nxx
              read(22,*) a(1),a(2),a(3)
              Tab1(i,j)=a(1)
              Tab2(i,j)=a(2)
              Tab3(i,j)=a(3)
           end do
        end do
        base_name1= trim(base_name)//'_1'
        call Write_Ncdf_var(base_name1,dimnames2d,trim(fil_sortie),Tab1,'double')
        base_name1=trim(base_name)//'_2'
        call Write_Ncdf_var(base_name1,dimnames2d,trim(fil_sortie),Tab2,'double')
        base_name1=trim(base_name)//'_3'
        call Write_Ncdf_var(base_name1,dimnames2d,trim(fil_sortie),Tab3,'double')
        deallocate(Tab1,Tab2,Tab3)
     endif

     close(22)
  end if

end subroutine dat2netcdf

!> subroutine init_ncdf 
!! Initialise the netcdf file 
!! @param nxx                dimension along x
!! @param nyy                dimension along y
!! @param fil_sortie         name of the file to initialise
!! @ param dimnames2d        dimensions for netcdf

subroutine init_ncdf(nxx,nyy,fil_sortie,dimnames2d)
  use netcdf
  use io_netcdf_grisli
  implicit none 
  integer,intent(in)  :: nxx                    !< dimension along x
  integer,intent(in)  :: nyy                    !< dimension along y
  character(len=*)::fil_sortie
  character(len=20),dimension(2) :: dimnames2d  !< dimensions pour netcdf pour tableau 2d
  ! initialisation
  call write_ncdf_dim('x',trim(fil_sortie),nxx)               ! dimensions des tableaux
  call write_ncdf_dim('y',trim(fil_sortie),nyy)
  ! ecriture d'un tableau tab 2D
  dimnames2d(1)='x'
  dimnames2d(2)='y'
end subroutine init_ncdf


!> subroutine lect_ncfile
!! Read the nc file given
!! @param varname              The name of the variable to read 
!! @param  filename            File to read from
!! @return Tab                 The value of Tab: Warning it is a real

subroutine lect_ncfile(varname,Tab,filename)
  use netcdf
  use io_netcdf_grisli
  implicit none 

  character(*),intent(in) :: varname          !< Var name to read
  real,dimension(:,:),intent(inout) :: Tab    !< Array to read in
  character(*),intent(in) :: filename         !< File to read from
  real*8, dimension(:,:), pointer :: tabvar


  if(.not. associated(tabvar)) then
     allocate(tabvar(size(Tab,1),size(Tab,2))) 
  else  ! to nullify the pointer if undefined 
    if (any(shape(tabvar).ne.(/size(Tab,1),size(Tab,2)/)) ) then 
        tabvar => null()
    end if
  end if


  call read_ncdf_var(varname,filename,tabvar)
  Tab(:,:)= tabvar(:,:)
!write(6,*) filename,varname,Tab(154,123)
end subroutine lect_ncfile


!> subroutine lect_input
!! Read the file given
!! @param numcol               Column number
!! @param basename             Base name of the variable to read 
!! @param col                  The column to read
!! @param  filename            File to read from
!! @param ncfileout            File out in case of .dat file to read
!! @return tabvar              The value of Tab(nxx,nyy): Warning it is a real



subroutine lect_input (numcol,basename,col,tabvar,filename,ncfileout) 
  !use netcdf
  !use io_netcdf_grisli
  implicit none
  integer,intent(in)  :: numcol                 !< column number
  character(len=*), intent(in) :: basename      !< base name of the variable to read
  integer,intent(in)  :: col                    !< column   1->average, 2->minval 3->maxval  
                                                !          ??? double emploi avec numcol
  real,dimension(:,:),intent(inout) :: tabvar   !< array to read in the variable
  character(len=*),intent(in) :: filename       !< name of the file to read
  character(len=*)::ncfileout                   !< name of the nc file to create 

  interface     !<<<<<<<<<<<<<<<<<<<
     subroutine lect_ncfile(varname,Tab,filename)            
       character(*),intent(in) :: varname
       real,dimension(:,:),intent(inout) :: Tab
       character(*),intent(in) :: filename
       real*8, dimension(:,:), pointer :: tabvar
     end subroutine lect_ncfile
  end interface !<<<<<<<<<<<<<<<<<<<


  character(1)  xcol
  write( xcol,'(i1)')  col

  if (index(filename,'.dat')  .ne.0) then    ! file in is a .dat

     call dat2netcdf(size(tabvar,1),size(tabvar,2),numcol,basename,filename,ncfileout)
     call lect_ncfile(trim(basename)//'_'//xcol,tabvar,ncfileout)               
  else
 
     if(index(filename,'.grd') .ne.0) then   ! file in is a .grd
 
        call lect_ncfile('z',tabvar,filename)
     else
                            ! file in is a .nc
        if(index(filename,'.nc') .ne.0) then
           call lect_ncfile(basename,tabvar,filename)
        endif
     endif
  endif


end subroutine lect_input