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!--------------------------------------------------------------------------------
! Copyright (c) 2016 Peter Grünberg Institut, Forschungszentrum Jülich, Germany
! This file is part of FLEUR and available as free software under the conditions
! of the MIT license as expressed in the LICENSE file in more detail.
!--------------------------------------------------------------------------------

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MODULE m_juDFT_time
  !*****************************************************************
  !     DESC:Timer module for measuring the execution times of different
  !     parts of the code
  !     timestart and timestop should be
  !     called with suitable names for timers
  !     Daniel Wortmann, Fri Sep  6 11:53:08 2002
  !*****************************************************************
  USE m_xmlOutput
  IMPLICIT NONE
  !     List of different timers
  PRIVATE
  INTEGER,PARAMETER         :: max_subtimer=5 ! blocks of subtimers are allocated in this size
  REAL                      :: min_time=0.02 ! minimal time to display in output (part of total)
  LOGICAL                   :: l_debug  !write out each start& stop of timer
  TYPE t_p
     TYPE(t_timer),POINTER:: p
  END TYPE t_p

  TYPE t_timer
     REAL                  :: starttime
     REAL                  :: time
     CHARACTER(LEN=60)     :: name
     INTEGER               :: n_subtimers
     TYPE(t_p),ALLOCATABLE :: subtimer(:)
     TYPE(t_timer),POINTER :: parenttimer
  END TYPE t_timer

  TYPE(t_timer),POINTER,SAVE:: globaltimer=>NULL()
  TYPE(t_timer),POINTER,SAVE:: current_timer=>NULL()
  CHARACTER(LEN=256),SAVE   :: lastfile=""
  INTEGER           ,SAVE   :: lastline=0

  PUBLIC timestart,timestop,writetimes,writelocation,writeTimesXML
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  PUBLIC resetIterationDependentTimers,check_time_for_next_iteration
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  PUBLIC juDFT_time_lastlocation !should not be used

CONTAINS



  SUBROUTINE priv_new_timer(name)
    IMPLICIT NONE
    CHARACTER(LEN=*),INTENT(IN)          ::name



    TYPE(t_timer),POINTER      ::t
    TYPE(t_p),ALLOCATABLE      :: tmp(:)


    ALLOCATE(t)
    t%starttime=cputime()
    t%time=0.0
    t%name=name
    t%n_subtimers=0
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    t%parenttimer=>null()
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    ALLOCATE(t%subtimer(max_subtimer))

    IF (ASSOCIATED(current_timer)) THEN
       ALLOCATE(t%parenttimer)
       t%parenttimer=>current_timer
       !now add timer to list of subtimers of parenttimer
       IF (current_timer%n_subtimers+1>SIZE(current_timer%subtimer)) THEN
          ALLOCATE(tmp(SIZE(current_timer%subtimer)))
          tmp=current_timer%subtimer
          DEALLOCATE(current_timer%subtimer)
          ALLOCATE(current_timer%subtimer(SIZE(tmp)+max_subtimer))
          current_timer%subtimer(:SIZE(tmp))=tmp
          DEALLOCATE(tmp)
       ENDIF

       current_timer%n_subtimers=current_timer%n_subtimers+1

       current_timer%subtimer(current_timer%n_subtimers)%p => t
    ELSE
       globaltimer=>t
    ENDIF
    current_timer=>t

  END SUBROUTINE priv_new_timer

  !<-- S: timestart(timer)

  SUBROUTINE timestart(ttimer,file,line)
    USE m_judft_args
    IMPLICIT NONE
    CHARACTER(LEN =*),INTENT(IN)          :: ttimer
    CHARACTER(LEN=*),INTENT(IN),OPTIONAL  :: file
    INTEGER,INTENT(IN),OPTIONAL           :: line

    INTEGER::n
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#ifdef CPP_MPI
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    INTEGER::irank,ierr
    INCLUDE 'mpif.h'
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#endif
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    IF (PRESENT(file)) lastfile=file
    IF (PRESENT(line)) lastline=line
    IF (.NOT.ASSOCIATED(current_timer)) THEN
       CALL priv_new_timer("Total Run")
       l_debug=judft_was_Argument("-debugtime")
    ENDIF

    DO n=1,current_timer%n_subtimers
       IF (TRIM(ttimer)==TRIM(current_timer%subtimer(n)%p%name)) THEN
          current_timer=>current_timer%subtimer(n)%p
          IF (current_timer%starttime>0) THEN
             WRITE(*,*) "Timer already running:",ttimer
             STOP "BUG:starttime"
          ENDIF
          current_timer%starttime=cputime()
          CALL priv_debug_output(" started ",current_timer%name)
          RETURN
       ENDIF
    ENDDO
    !new subtimer
    CALL priv_new_timer(ttimer)
    CALL priv_debug_output(" started ",current_timer%name)
  END SUBROUTINE timestart

  !>
  !<-- S:timestop(timer)

  SUBROUTINE timestop(ttimer)
    CHARACTER(LEN =*),INTENT(IN) :: ttimer

    IF (.NOT.TRIM(ttimer)==TRIM(current_timer%name)) THEN
       WRITE(*,*)"Current timer:",current_timer%name," could not stop:",ttimer
       STOP "BUG:timestop"
    ENDIF
    IF (current_timer%starttime<0) THEN
       WRITE(*,*)   "Timer not initialized:"//ttimer
       STOP "BUG:timestop"
    ENDIF
    current_timer%time=current_timer%time+cputime()-current_timer%starttime
    current_timer%starttime=-1

    CALL priv_debug_output(" stopped ",current_timer%name)

    current_timer=>current_timer%parenttimer
  END SUBROUTINE timestop

  !>
  SUBROUTINE priv_debug_output(startstop,name)
    IMPLICIT NONE
    CHARACTER(LEN=*),INTENT(IN):: startstop,name
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#ifdef CPP_MPI
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    INTEGER::irank,ierr
    INCLUDE 'mpif.h'
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#endif
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    IF (.NOT.l_debug) RETURN
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#ifdef CPP_MPI
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    CALL MPI_COMM_RANK(MPI_COMM_WORLD,irank,ierr)
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    WRITE(*,"(i3,3a,f20.3)") irank,startstop,name," at:",cputime()
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#else
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    WRITE(*,"(3a,f20.3)") startstop,name," at:",cputime()
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#endif      
  END SUBROUTINE priv_debug_output

  RECURSIVE SUBROUTINE priv_writetimes_longest(timer,fid,timernames,timertimes)
    IMPLICIT NONE
    TYPE(t_timer),INTENT(IN) :: timer
    INTEGER,INTENT(IN),OPTIONAL              :: fid
    CHARACTER(LEN=60),INTENT(INOUT),OPTIONAL ::timernames(10)
    REAL,INTENT(INOUT),OPTIONAL              ::timertimes(10)

    REAL,ALLOCATABLE              ::times(:)
    CHARACTER(LEN=60),ALLOCATABLE ::names(:)
    REAL                          ::sum_time

    INTEGER :: n,i
    IF (.NOT.PRESENT(timernames)) THEN
       ALLOCATE(times(10),names(10))
       times=0.0
       names=""
       CALL priv_writetimes_longest(timer,timernames=names,timertimes=times)
       WRITE(fid,*)
       WRITE(fid,*) "-------------------------------------------------"
       WRITE(fid,*)
       WRITE(fid,*) "most relevant subroutines:"
       sum_time=0.0
       DO n=1,10
          IF (MAXVAL(times)<1E-4) EXIT
          i=MAXLOC(times,dim=1)
          WRITE(fid,"(a,T7,a,T46,a)") " ",TRIM(names(i)),timestring(times(i),timer%time,2)
          sum_time=sum_time+times(i)
          times(i)=0.0
       ENDDO
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       WRITE(fid,"(t77,'Sum: ',f5.1,'%')") sum_time/timer%time*100.
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       WRITE(fid,*)
       WRITE(fid,*) "-------------------------------------------------"
       WRITE(fid,*)
       RETURN
    ENDIF

    sum_time=timer%time
    DO n=1,timer%n_subtimers
       CALL priv_writetimes_longest(timer%subtimer(n)%p,timernames=timernames,timertimes=timertimes)
       sum_time=sum_time-timer%subtimer(n)%p%time
    ENDDO
    IF (sum_time>MINVAL(timertimes)) THEN
       i=MINLOC(timertimes,dim=1)
       IF (ASSOCIATED(timer%parenttimer)) THEN
          WRITE(timernames(i),"(a18,'->',a40)") timer%parenttimer%name,timer%name
       ELSE
          timernames(i)=timer%name
       ENDIF
       timertimes(i)=sum_time
    ENDIF
  END SUBROUTINE priv_writetimes_longest

  RECURSIVE SUBROUTINE priv_writetimes(timer,level,fid,debug)
    IMPLICIT NONE
    TYPE(t_timer),INTENT(IN)    :: timer
    INTEGER,INTENT(IN)          :: level,fid
    LOGICAL,INTENT(IN),OPTIONAL ::debug

    INTEGER          :: n
    REAL             :: time
    CHARACTER(LEN=30):: timername,indentstring
    WRITE(timername,"(i0)") level-1
    WRITE(indentstring,"(100a)") (" ",n=2,(MIN(level,5))),TRIM(timername)
    IF (timer%starttime>0) THEN
       time=timer%time+cputime()-timer%starttime
       timername=timer%name//" not term."
    ELSE
       time=timer%time
       timername=timer%name
    ENDIF
    IF (time<min_time*globaltimer%time) RETURN !do not print parts that take less than min_time
    WRITE(fid,"(a,T7,a,T46,a)") TRIM(indentstring),TRIM(timername),timestring(time,globaltimer%time,level)
    FLUSH(fid)
    IF (PRESENT(debug).OR.timer%n_subtimers==0) RETURN

    time=0
    DO n=1,timer%n_subtimers
       time=time+timer%subtimer(n)%p%time
    ENDDO
    WRITE(fid,"(a,a,T46,a)") TRIM(indentstring)," measured in submodules:",timestring(time,-.1,level)
    FLUSH(fid)
    DO n=1,timer%n_subtimers
       CALL priv_writetimes(timer%subtimer(n)%p,level+1,fid)
    ENDDO
  END SUBROUTINE priv_writetimes

  !<-- S:writetimes()

  RECURSIVE SUBROUTINE writelocation(location)
    !writes the stack of current timers to std-out
    !usefull for debugging and error messages
    IMPLICIT NONE
    TYPE(t_timer),INTENT(IN),OPTIONAL::location

    IF (.NOT.PRESENT(location)) THEN
       IF (ASSOCIATED(current_timer)) CALL writelocation(current_timer)
    ELSE
       WRITE(*,*) "Timer:",location%name
       IF (ASSOCIATED(location%parenttimer)) CALL writelocation(location%parenttimer)
    ENDIF
  END SUBROUTINE writelocation


  ! writes all times to file
  SUBROUTINE writetimes(stdout)
    IMPLICIT NONE
    LOGICAL,INTENT(IN),OPTIONAL::stdout
    INTEGER :: fn,irank=0
    LOGICAL :: l_out
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#ifdef CPP_MPI
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    INCLUDE "mpif.h"
    INTEGER::err,isize
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    CALL MPI_COMM_RANK(MPI_COMM_WORLD,irank,err)
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#endif
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    IF (.NOT.ASSOCIATED(globaltimer)) RETURN !write nothing if no timing recorded
    l_out=.FALSE.
    IF (PRESENT(stdout)) l_out=stdout
    IF (l_out) THEN
       fn=6
    ELSE
       IF (irank>0) RETURN
       fn=2
       OPEN(2,FILE ='juDFT_times',STATUS="replace")
    ENDIF
    !Stop globaltimer if still running
    IF (globaltimer%starttime>-1) THEN
       globaltimer%time=cputime()-globaltimer%starttime
       globaltimer%starttime=-1
    ENDIF
    WRITE(fn,"('Total execution time: ',i0,'sec')") INT(globaltimer%time)
    CALL priv_writetimes_longest(globaltimer,fid=fn)

    WRITE(fn,"('Total execution time: ',i0,'sec, minimal timing printed:',i0,'sec')") &
         INT(globaltimer%time),INT(min_time*globaltimer%time)
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#ifdef CPP_MPI
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    CALL MPI_COMM_SIZE(MPI_COMM_WORLD,isize,err)
    WRITE(fn,*) "Program used ",isize," PE"
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#endif
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    CALL priv_writetimes(globaltimer,1,fn)
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    WRITE(fn,*)
    WRITE(fn,*) "-------------------------------------------------"
    WRITE(fn,*)
    WRITE(fn,*) "Total timings:"
    min_time=0.0
    CALL priv_writetimes(globaltimer,1,fn)
    FLUSH(fn)
    IF (.NOT.l_out) CLOSE(2)
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  END SUBROUTINE writetimes
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  ! writes all times to out.xml file
  SUBROUTINE writeTimesXML()
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    IMPLICIT NONE
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    INTEGER                :: fn,irank=0
    LOGICAL                :: l_out
    TYPE(t_timer), POINTER :: timer
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#ifdef CPP_MPI
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    INCLUDE "mpif.h"
    INTEGER::err,isize
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    CALL MPI_COMM_RANK(MPI_COMM_WORLD,irank,err)
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#endif
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    IF (irank.NE.0) RETURN
    IF (.NOT.ASSOCIATED(globaltimer)) RETURN !write nothing if no timing recorded

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    timer => NULL()
    CALL findIterationTimer(globaltimer,timer)
    IF(.NOT.ASSOCIATED(timer)) RETURN
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    CALL openXMLElement('timing',(/'units'/),(/'sec'/))
    CALL privWriteTimesXML(timer,1)
    CALL closeXMLElement('timing')

  END SUBROUTINE writeTimesXML

  RECURSIVE SUBROUTINE privWriteTimesXML(timer,level)

    IMPLICIT NONE

    TYPE(t_timer),INTENT(IN)    :: timer
    INTEGER,INTENT(IN)          :: level

    INTEGER            :: n, timerNameLength
    REAL               :: time
    CHARACTER(LEN=50)  :: timername
    CHARACTER(LEN=50)  :: attributes(2)

    IF (timer%starttime>0) THEN
       time=timer%time+cputime()-timer%starttime
    ELSE
       time=timer%time
    END IF
    timername=''
    DO n = 1, level-2
       timername = timername(1:3*(n-1))//'|  '
    END DO
    IF (level.GE.2) THEN
       timername = timername(1:3*(level-2))//'+--'
    END IF
    timername=TRIM(ADJUSTL(timername))//TRIM(ADJUSTL(timer%name))
    timerNameLength = LEN(TRIM(ADJUSTL(timername)))

    DO n = 1, timerNameLength
       IF (timername(n:n).EQ.'&') THEN
          timername(n:n) = '+'
       END IF
    END DO

    WRITE(attributes(1),'(a)') TRIM(ADJUSTL(timername))
    WRITE(attributes(2),'(f12.3)') time
    IF(timer%n_subtimers.EQ.0) THEN
       CALL writeXMLElementForm('timer',(/'name ','value'/),attributes,&
            RESHAPE((/14+20-3*level,55-timerNameLength,timerNameLength,12/),(/2,2/)))
    ELSE
       CALL openXMLElementForm('compositeTimer',(/'name ','value'/),attributes,&
            RESHAPE((/5+20-3*level,55-timerNameLength,timerNameLength,12/),(/2,2/)))
       DO n = 1, timer%n_subtimers
          CALL privWriteTimesXML(timer%subtimer(n)%p,level+1)
       END DO
       CALL closeXMLElement('compositeTimer')
    END IF
  END SUBROUTINE privWriteTimesXML

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  SUBROUTINE check_time_for_next_iteration(it,l_cont)
    USE m_judft_args
    IMPLICIT NONE
    INTEGER,INTENT(IN)     :: it
    LOGICAL,INTENT(INOUT)  :: l_cont
    CHARACTER(len=20)::wtime_string
    INTEGER          :: wtime,time_used,time_per_iter
    INTEGER:: irank=0
#ifdef CPP_MPI
    INCLUDE "mpif.h"
    INTEGER::err,isize
    CALL MPI_COMM_RANK(MPI_COMM_WORLD,irank,err)
#endif

    IF (.NOT.l_cont) RETURN !stop anyway
    IF (.NOT.ASSOCIATED(globaltimer)) RETURN !do nothing if no timing recorded
    IF (judft_was_argument("-wtime")) THEN
       wtime_string=judft_string_for_argument("-wtime")
       READ(wtime_string,*) wtime
       time_used=FLOOR((cputime()-globaltimer%starttime)/60.0)+1
       time_per_iter=FLOOR((cputime()-globaltimer%starttime)/60.0/it)+1
       IF (irank==0) THEN
          WRITE(*,*) "Test for time of next iteration:"
          WRITE(*,*) "Time provided (min):",wtime
          WRITE(*,*) "Time used     (min):",time_used
          WRITE(*,*) "Time per iter (min):",time_per_iter
       ENDIF
       IF (time_used+time_per_iter>wtime) THEN
          l_cont=.FALSE.
          IF (irank==0) WRITE(*,*) "No further iterations"
       ENDIF
    END IF
  END SUBROUTINE check_time_for_next_iteration


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  SUBROUTINE resetIterationDependentTimers()

    IMPLICIT NONE
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    INTEGER                :: fn,irank=0
    LOGICAL                :: l_out
    TYPE(t_timer), POINTER :: timer, parenttimer
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#ifdef CPP_MPI
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    INCLUDE "mpif.h"
    INTEGER::err,isize
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    CALL MPI_COMM_RANK(MPI_COMM_WORLD,irank,err)
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#endif
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    !Check if not enough time for another iteration is left
    
       
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    IF (irank.NE.0) RETURN
    IF (.NOT.ASSOCIATED(globaltimer)) RETURN !write nothing if no timing recorded

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    timer => NULL()
    CALL findIterationTimer(globaltimer,timer)
    IF(.NOT.ASSOCIATED(timer)) RETURN

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    DO WHILE (TRIM(ADJUSTL(timer%name)).NE.'Iteration')
       IF(timer%n_subtimers.EQ.0) RETURN
       timer => timer%subtimer(1)%p
    END DO

    parenttimer => timer%parenttimer
    CALL resetSubtimers(timer%parenttimer)
    ALLOCATE(parenttimer%subtimer(5))

  END SUBROUTINE resetIterationDependentTimers

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  RECURSIVE SUBROUTINE findIterationTimer (parent, result)

    IMPLICIT NONE

    TYPE(t_timer),POINTER,INTENT(IN)    :: parent
    TYPE(t_timer),POINTER,INTENT(OUT)   :: result

    INTEGER numSubtimers, i

    IF(TRIM(ADJUSTL(parent%name)).EQ.'Iteration') THEN
       result => parent
    ELSE
       numSubtimers = parent%n_subtimers
       DO i = 1, numSubtimers
          CALL findIterationTimer(parent%subtimer(i)%p,result)
          IF (ASSOCIATED(result)) RETURN
       END DO
    END IF

  END SUBROUTINE findIterationTimer

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  RECURSIVE SUBROUTINE resetSubtimers (timer)

    IMPLICIT NONE

    TYPE(t_timer),INTENT(INOUT)    :: timer

    INTEGER :: n

    DO n = 1, timer%n_subtimers
       CALL resetSubtimers (timer%subtimer(n)%p)
       DEALLOCATE(timer%subtimer(n)%p)
    END DO
    DEALLOCATE(timer%subtimer)
    timer%n_subtimers = 0
  END SUBROUTINE resetSubtimers

  !>
  !<-- private function timestring

  FUNCTION timestring(time,ttime,level)
    REAL,INTENT(IN)    :: time,ttime
    CHARACTER*(90)     :: timestring
    INTEGER,INTENT(IN) ::level
    !     .. Local Scalars ..
    REAL :: rest,seconds
    INTEGER :: ihours,iminutes
    CHARACTER(LEN=90)::formatstring
    rest = time

    ihours = INT(rest/3600.0)
    rest = rest - REAL(ihours)*3600

    iminutes = INT(rest/60.0)
    seconds = rest - REAL(iminutes)*60
    IF (ttime<0) THEN
       formatstring="(f9.2,'sec = ',i3,'h ',i2,'min ',i2,'sec')"
       WRITE (timestring,FMT = formatstring) time,ihours,iminutes,INT(seconds)
    ELSE
       WRITE(formatstring,"(a,i0,a)") "(f9.2,'sec= ',i3,'h ',i2,'min ',i2,'sec ->',",(2*level-1),"x,f5.1,'%')"
       WRITE (timestring,FMT = formatstring) time,ihours,iminutes,INT(seconds),time/ttime*100.0
    ENDIF

  END FUNCTION timestring

  !>
  !<-- F: cputime()
  !Private function to return the cpu_time in sec
  FUNCTION cputime()
    !$    use omp_lib
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#ifdef __INTEL_COMPILER
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    USE ifport
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#endif
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    IMPLICIT NONE
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#ifdef CPP_MPI
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    INCLUDE 'mpif.h'
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#endif
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    REAL::cputime
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    !TRY TO USE mpi OR openmp wall-clock functions
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#ifdef CPP_MPI
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    cputime=MPI_WTIME()
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#elif __INTEL_COMPILER
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    cputime=rtc()
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#elif _OPENMP
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    cputime = omp_get_wtime ( )
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#else
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    !use f95 intrinsic function
    CALL CPU_TIME(cputime)
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#endif
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  END FUNCTION cputime
  !>
  SUBROUTINE juDFT_time_lastlocation(PE)
    CHARACTER(LEN=4),INTENT(IN):: PE
    IF (lastline>0) THEN
       WRITE(0,*) PE,"Last kown location:"
       WRITE(0,*) PE,"File:",TRIM(lastfile),":",lastline
       WRITE(0,*) PE,"*****************************************"
    ENDIF
  END SUBROUTINE juDFT_time_lastlocation
END MODULE m_juDFT_time
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