! (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.
!
!
! FORTRAN 90 Implementation: bufr_get_keys
!
! Description: how to read values of different type of keys from BUFR messages.
!
!
program bufr_get_keys
use eccodes
implicit none
integer            :: ifile
integer            :: iret
integer            :: ibufr
integer            :: i, count=0
integer(kind=4)    :: blockNumber,stationNumber
real(kind=8)       :: t2m
integer(kind=4), dimension(:), allocatable    :: descriptors
real(kind=8), dimension(:), allocatable       :: values
character(len=9)   :: typicalDate

  call codes_open_file(ifile,'../../data/bufr/syno_multi.bufr','r')

  ! The first bufr message is loaded from file,
  ! ibufr is the bufr id to be used in subsequent calls
  call codes_bufr_new_from_file(ifile,ibufr,iret)

  do while (iret/=CODES_END_OF_FILE)

    ! Get and print some keys form the BUFR header
    write(*,*) 'message: ',count

    ! We need to instruct ecCodes to expand all the descriptors
    ! i.e. unpack the data values
    call codes_set(ibufr,"unpack",1);

    ! Get as character
    call codes_get(ibufr,'typicalDate',typicalDate)
    write(*,*) '  typicalDate:',typicalDate

    ! Get as integer
    call codes_get(ibufr,'blockNumber',blockNumber);
    write(*,*) '  blockNumber:',blockNumber

    ! Get as integer
    call codes_get(ibufr,'stationNumber',stationNumber);
    write(*,*) '  stationNumber:',stationNumber

    ! get as real
    call codes_get(ibufr,'airTemperatureAt2M',t2m);
    write(*,*) '  airTemperatureAt2M:',t2m

    ! ---- array of integer ----------------

    ! get the expanded descriptors
    call codes_get(ibufr,'bufrdcExpandedDescriptors',descriptors)

    do i=1,size(descriptors)
        write(*,*) '  ',i,descriptors(i)
    enddo

    ! ---- array of real ----------------

    ! Get the expanded data values
    call codes_get(ibufr,'numericValues',values)

    do i=1,size(values)
        write(*,*) '  ',i,values(i)
    enddo

    ! Get as character
    call codes_get(ibufr,'typicalDate',typicalDate)
    write(*,*) '  typicalDate:',typicalDate

    ! Free arrays
    deallocate(values)
    deallocate(descriptors)

    ! Release the bufr message
    call codes_release(ibufr)

    ! Load the next bufr message
    call codes_bufr_new_from_file(ifile,ibufr,iret)

    count=count+1

  end do

  ! Close file
  call codes_close_file(ifile)

end program bufr_get_keys