! (C) Copyright 2005- ECMWF.
!
! This software is licensed under the terms of the Apache Licence Version 2.0
! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
!
! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
!
!
!
!  Description: Set the data contained in a GRIB file.
!               In this example no missing values are present.
!               If there are missing values, refer to: grib_set_bitmap
!
program set_data
   use eccodes
   implicit none
   integer                         :: outfile
   integer                         :: i, igrib, iret, numberOfValues, cnt
   real                            :: d, e
   real, dimension(:), allocatable :: values
   integer, parameter              :: max_strsize = 200
   character(len=max_strsize)      :: outfile_name

   call getarg(1, outfile_name)
   call codes_open_file(outfile, outfile_name, 'w')

   ! note: the full name of the sample file is "regular_ll_pl_grib1.tmpl"
   ! sample files are stored in the samples directory (use codes_info to
   ! see where that is). The default sample path can be changed by
   ! setting the environment variable ECCODES_SAMPLES_PATH
   call codes_grib_new_from_samples(igrib, 'regular_ll_pl_grib1')

   ! here we're changing the data values only, so the number of values
   ! will be the same as the sample GRIB.
   ! but if your data array has a different size, then specify the grid geometry
   ! (e.g. keys Ni, Nj etc) and set the correct number of data values
   call codes_get_size(igrib, 'values', numberOfValues)

   allocate (values(numberOfValues), stat=iret)
   d = 10e-8
   e = d
   cnt = 1
   do i = 1, numberOfValues
      if (cnt > 100) then
         e = e*10
         cnt = 1
      end if
      values(i) = d
      !print *, values(i)
      d = d + e
      cnt = cnt + 1
   end do

   call codes_set(igrib, 'bitsPerValue', 16)

   ! set data values
   call codes_set(igrib, 'values', values)
   call codes_write(igrib, outfile)
   call codes_release(igrib)
   deallocate (values)

end program set_data
