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!
!-----------------------------------------------------------------------
!
!Purpose:
! Solve N-group transport equation for fluxes using the current iteration
! method for the multicell surfacic approximation.
!
!Copyright:
! Copyright (C) 2025 Ecole Polytechnique de Montreal
! This library is free software; you can redistribute it and/or
! modify it under the terms of the GNU Lesser General Public
! License as published by the Free Software Foundation; either
! version 2.1 of the License, or (at your option) any later version
!
!Author(s): A. Hebert
!
!Parameters: input
! KPSYS pointer to the assembly matrices (L_PIJ signature). KPSYS is
! an array of directories.
! IPTRK pointer to the tracking (L_TRACK signature).
! IFTRAK not used.
! IMPX print flag (equal to zero for no print).
! NGEFF number of energy groups processed in parallel.
! NGIND energy group indices assign to the NGEFF set.
! IDIR not used (=0 only for SYBIL).
! NREG total number of regions for which specific values of the
! neutron flux and reactions rates are required.
! NUNKNO total number of unknowns in vectors SUNKNO and FUNKNO.
! MAT index-number of the mixture type assigned to each volume.
! VOL volumes.
! SUNKNO input source vector.
! TITR title.
!
!Parameters: input/output
! FUNKNO unknown vector.
!
!-----------------------------------------------------------------------
!
SUBROUTINE MUSF(KPSYS,IPTRK,IMPX,NGEFF,NGIND,IDIR,NREG,NUNKNO,MAT,VOL, &
& FUNKNO,SUNKNO,TITR)
USE GANLIB
!----
! SUBROUTINE ARGUMENTS
!----
TYPE(C_PTR) KPSYS(NGEFF),IPTRK
CHARACTER TITR*72
INTEGER NGEFF,NGIND(NGEFF),IMPX,IDIR,NREG,NUNKNO,MAT(NREG)
REAL VOL(NREG),FUNKNO(NUNKNO,NGEFF),SUNKNO(NUNKNO,NGEFF)
!----
! LOCAL VARIABLES
!----
PARAMETER (IUNOUT=6,NSTATE=40)
CHARACTER NAMLCM*12,NAMMY*12
INTEGER ISTATE(NSTATE)
REAL RSTATE(NSTATE)
LOGICAL EMPTY,LCM
!----
! ALLOCATABLE ARRAYS
!----
TYPE(C_PTR) PIJW_PTR,PISW_PTR,PSJW_PTR,PSSW_PTR
INTEGER, ALLOCATABLE, DIMENSION(:) :: NMC_NODE,NMC_SURF,IFR,MIX,INUM,IGEN,IMAC
REAL, ALLOCATABLE, DIMENSION(:) :: ALB,DVX
REAL, POINTER, DIMENSION(:) :: PIJW,PISW,PSJW,PSSW
!
IF(IDIR.NE.0) CALL XABORT('MUSF: EXPECTING IDIR=0')
IF(MAT(1).LT.0) CALL XABORT('MUSF: EXPECTING MAT(1)>=0')
IF(VOL(1).LT.0.0) CALL XABORT('MUSF: EXPECTING VOL(1)>=0')
CALL LCMINF(KPSYS(1),NAMLCM,NAMMY,EMPTY,ILONG,LCM)
!----
! RECOVER MUST SPECIFIC PARAMETERS
!----
IF(IMPX.GT.2) WRITE(IUNOUT,'(//7H MUSF: ,A72)') TITR
CALL LCMGET(IPTRK,'STATE-VECTOR',ISTATE)
IF(NREG.NE.ISTATE(1)) THEN
CALL XABORT('MUSF: STATE VECTOR HAS INVALID # OF ZONES.')
ENDIF
NMACRO=ISTATE(24) ! NGEN
IF(NMACRO.EQ.0) CALL XABORT('MUSF: NO MACRO GEOMETRIES DEFINED.')
NMCEL=NMACRO
NMERGE=NMACRO
NGEN=NMACRO
ALLOCATE(IGEN(NMERGE),INUM(NMCEL))
DO IK=1,NMERGE
IGEN(IK)=IK
ENDDO
DO IK=1,NMCEL
INUM(IK)=IK
ENDDO
IF(NMACRO.EQ.0) CALL XABORT('MUSF: MACRO OPTION IS MANDATORY.')
ALLOCATE(NMC_NODE(NMACRO+1),NMC_SURF(NMACRO+1),IMAC(NREG))
CALL LCMGET(IPTRK,'NMC_NODE',NMC_NODE)
CALL LCMGET(IPTRK,'NMC_SURF',NMC_SURF)
CALL LCMGET(IPTRK,'MERGE_MACRO',IMAC)
CALL LCMGET(IPTRK,'EXCELTRACKOP',RSTATE)
EPSJ=RSTATE(12)
NMIX=NMC_SURF(NMACRO+1)
NIFR=NMC_SURF(NMACRO+1)
ALLOCATE(IFR(NIFR),ALB(NIFR),MIX(NMIX),DVX(NMIX))
CALL LCMGET(IPTRK,'IFR',IFR)
CALL LCMGET(IPTRK,'ALB',ALB)
CALL LCMGET(IPTRK,'MIX',MIX)
CALL LCMGET(IPTRK,'DVX',DVX)
J1=0
NMIX=0
NPIJ=0
NPIS=0
NPSS=0
DO IMACRO=1,NMACRO
J2=NMC_NODE(IMACRO+1)-NMC_NODE(IMACRO)
J3=NMC_SURF(IMACRO+1)-NMC_SURF(IMACRO)
J1=J1+J2
NMIX=NMIX+J3
NPIJ=NPIJ+J2*J2
NPIS=NPIS+J2*J3
NPSS=NPSS+J3*J3
ENDDO
IF(J1.NE.NREG) CALL XABORT('MUSF: INVALID NREG.')
IF(NMIX.NE.NMC_SURF(NMACRO+1)) CALL XABORT('MUSF: INVALID NMIX.')
!----
! MAIN LOOP OVER ENERGY GROUPS.
!----
DO II=1,NGEFF
IF(IMPX.GT.1) WRITE(IUNOUT,'(/23H MUSF: PROCESSING GROUP,I5, &
& 6H WITH ,A,1H.)') NGIND(II),'MUSF'
!
IF(LCM) THEN
CALL LCMGPD(KPSYS(II),'PIJW$SYBIL',PIJW_PTR)
CALL LCMGPD(KPSYS(II),'PISW$SYBIL',PISW_PTR)
CALL LCMGPD(KPSYS(II),'PSJW$SYBIL',PSJW_PTR)
CALL LCMGPD(KPSYS(II),'PSSW$SYBIL',PSSW_PTR)
!
CALL C_F_POINTER(PIJW_PTR,PIJW,(/ NPIJ /))
CALL C_F_POINTER(PISW_PTR,PISW,(/ NPIS /))
CALL C_F_POINTER(PSJW_PTR,PSJW,(/ NPIS /))
CALL C_F_POINTER(PSSW_PTR,PSSW,(/ NPSS /))
ELSE
ALLOCATE(PIJW(NPIJ),PISW(NPIS),PSJW(NPIS),PSSW(NPSS))
CALL LCMGET(KPSYS(II),'PIJW$SYBIL',PIJW)
CALL LCMGET(KPSYS(II),'PISW$SYBIL',PISW)
CALL LCMGET(KPSYS(II),'PSJW$SYBIL',PSJW)
CALL LCMGET(KPSYS(II),'PSSW$SYBIL',PSSW)
ENDIF
IJAT=MAXVAL(MIX)
CALL MUSJJ2(NREG,NMCEL,NMERGE,NGEN,IJAT,NPIJ,NPIS,NPSS,EPSJ,NUNKNO, &
& NMIX,NIFR,FUNKNO(1,II),SUNKNO(1,II),IMPX,NMC_NODE,NMC_SURF,IFR,ALB, &
& INUM,MIX,DVX,IGEN,IMAC,PIJW,PISW,PSJW,PSSW)
IF(.NOT.LCM) DEALLOCATE(PSSW,PSJW,PISW,PIJW)
!----
! END OF LOOP OVER ENERGY GROUPS
!----
ENDDO
DEALLOCATE(DVX,MIX,ALB,IFR)
DEALLOCATE(IMAC,NMC_SURF,NMC_NODE,INUM,IGEN)
RETURN
END
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