MODULE progress_bar

!--------------------------------------------------------------------------------!
! This file is part of PALM.
!
! PALM 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 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 1997-2014 Leibniz Universitaet Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
! 
!
! Former revisions:
! -----------------
! $Id: progress_bar.f90 1402 2014-05-09 14:25:13Z keck $
!
! Description:
! ------------
! CPU-time measurements for any program part whatever. Results of the
!------------------------------------------------------------------------------!

    USE control_parameters,                                                    &
        ONLY : end_time, simulated_time, simulated_time_at_begin, time_restart

    USE, INTRINSIC ::  ISO_FORTRAN_ENV,                                     &
        ONLY :  OUTPUT_UNIT

    USE kinds

    IMPLICIT NONE

    PRIVATE
    PUBLIC   batch_job, finish_progress_bar, output_progress_bar

    CHARACTER(LEN=60) ::  bar      !: progress bar, initially filled with "_"
    CHARACTER(LEN=60) ::  crosses  !: filled with "X"

    INTEGER(iwp) ::  ilength !: length of progress bar filled with "X"

    LOGICAL ::  batch_job = .FALSE.   !: switch to determine the run mode

    REAL(wp) ::  time_to_be_simulated !: in sec

    LOGICAL ::  initialized = .FALSE. !: switch to determine if bar is initialized

    SAVE

 CONTAINS

    SUBROUTINE init_progress_bar

       IMPLICIT NONE

!
!--    Calculate the time to be simulated in this job
!--    (in case of automatic restarts the calculated time will probably be
!--    larger than the time which will actually be simulated)
       IF ( time_restart /= 9999999.9_wp  .AND.  time_restart < end_time  .AND.&
            time_restart > simulated_time_at_begin )  THEN
          time_to_be_simulated = time_restart - simulated_time_at_begin
       ELSE
          time_to_be_simulated = end_time     - simulated_time_at_begin
       ENDIF

       bar = '____________________________________________________________'
       crosses = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
!
!--    Line feed on stdout to seperate the progress bar from previous messages
       WRITE ( OUTPUT_UNIT, '(1X)' )
#if defined( __intel_compiler )
!
!--    The Intel compiler does not allow to immediately flush the output buffer
!--    in case that option ADVANCE='NO' is used in the write statement.
!--    A workaround is to set a special carriage control feature and use "+" as
!--    first output character, but this non-standard and only available with the
!--    Intel compiler
       OPEN ( OUTPUT_UNIT, CARRIAGECONTROL='FORTRAN' )
#endif
       initialized = .TRUE.

    END SUBROUTINE init_progress_bar


    SUBROUTINE output_progress_bar
!------------------------------------------------------------------------------!
! Description:
! ------------
!
!------------------------------------------------------------------------------!

       IMPLICIT NONE

       REAL(wp) ::  remaining_time_in_percent  !: remaining time to be simulated
                                               !: in the job

!
!--    Porgress bar does not make sense in batch mode (and also ADVANCE=no does
!--    not properly work in batch mode on Cray XC30)
       IF ( batch_job )  RETURN

       IF ( .NOT. initialized )  CALL init_progress_bar
!
!--    Calculate length of progress bar
       remaining_time_in_percent =                                             &
             ( simulated_time - simulated_time_at_begin ) / time_to_be_simulated

       ilength = remaining_time_in_percent * 60.0_wp
       ilength = MIN( ilength, 60 )

       bar(1:ilength) = crosses(1:ilength)

#if defined( __intel_compiler )
       WRITE ( OUTPUT_UNIT, '(A,6X,''['',A,''] '',F5.1,'' left'')' )           &
               '+', bar,                                                       &
                MAX( 0.0_wp, ( 1.0_wp - remaining_time_in_percent ) * 100.0_wp )
#else
       WRITE ( OUTPUT_UNIT, '(A,6X,''['',A,''] '',F5.1,'' left'')',            &
               ADVANCE='NO' )  CHAR( 13 ), bar,                                &
                MAX( 0.0_wp, ( 1.0_wp - remaining_time_in_percent ) * 100.0_wp )
#endif
       CALL local_flush( OUTPUT_UNIT )

    END SUBROUTINE output_progress_bar

    SUBROUTINE finish_progress_bar

       IMPLICIT NONE

       IF ( batch_job )  RETURN

#if defined( __intel_compiler )
!
!--    Reset to the default carriage control
       OPEN ( OUTPUT_UNIT, CARRIAGECONTROL='LIST' )
#endif
!
!--    Line feed when simulation has finished
       WRITE ( OUTPUT_UNIT, '(1X)' )

    END SUBROUTINE finish_progress_bar

 END MODULE progress_bar