MODULE stopping_crit_mod

implicit none

!=======================================================================
contains
!=======================================================================

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!
!!! Purpose: Criterions to check if the PEM needs to call the PCM
!!! Author: RV & LL, 02/2023
!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

SUBROUTINE stopping_crit_h2o_ice(cell_area,h2oice_ini_surf,ini_h2oice_sublim,h2o_ice,stopPEM,ngrid)

use time_evol_mod, only: h2o_ice_crit
use comslope_mod,  only: subslope_dist, nslope

implicit none

!=======================================================================
!
! Routine to check if the h2o ice criterion to stop the PEM is reached
!
!=======================================================================
! Inputs
!-------
integer,                          intent(in) :: ngrid             ! # of physical grid points
real,    dimension(ngrid),        intent(in) :: cell_area         ! Area of the cells
real,    dimension(ngrid,nslope), intent(in) :: h2o_ice           ! Actual density of h2o ice
real,                             intent(in) :: h2oice_ini_surf   ! Initial surface of sublimating h2o ice
logical, dimension(ngrid,nslope), intent(in) :: ini_h2oice_sublim ! Grid points where h2o ice was initially sublimating
! Outputs
!--------
integer, intent(inout) :: stopPEM ! Stopping criterion code
! Locals
! ------
integer :: i, islope       ! Loop
real    :: h2oice_now_surf ! Current surface of h2o ice

!=======================================================================
! Computation of the present surface of h2o ice still sublimating
h2oice_now_surf = 0.
do i = 1,ngrid
    do islope = 1,nslope
        if (ini_h2oice_sublim(i,islope) .and. h2o_ice(i,islope) > 0.) h2oice_now_surf = h2oice_now_surf + cell_area(i)*subslope_dist(i,islope)
    enddo
enddo

! Check of the criterion
if (h2oice_now_surf < h2oice_ini_surf*(1. - h2o_ice_crit)) then
    stopPEM = 1
    write(*,*) "Reason of stopping: the surface of h2o ice sublimating reaches the threshold"
    write(*,*) "h2oice_now_surf < h2oice_ini_surf*(1. - h2o_ice_crit)", h2oice_now_surf < h2oice_ini_surf*(1. - h2o_ice_crit)
    write(*,*) "Initial surface of h2o ice sublimating =", h2oice_ini_surf
    write(*,*) "Current surface of h2o ice sublimating =", h2oice_now_surf
    write(*,*) "Percentage of change accepted =", h2o_ice_crit*100
else if (h2oice_now_surf > h2oice_ini_surf*(1. + h2o_ice_crit)) then
    stopPEM = 1
    write(*,*) "Reason of stopping: the surface of h2o ice sublimating reaches the threshold"
    write(*,*) "h2oice_now_surf > h2oice_ini_surf*(1. + h2o_ice_crit)", h2oice_now_surf > h2oice_ini_surf*(1. + h2o_ice_crit)
    write(*,*) "Initial surface of h2o ice sublimating =", h2oice_ini_surf
    write(*,*) "Current surface of h2o ice sublimating =", h2oice_now_surf
    write(*,*) "Percentage of change accepted =", h2o_ice_crit*100
endif

if (abs(h2oice_ini_surf) < 1.e-5) stopPEM = 0

END SUBROUTINE stopping_crit_h2o_ice

!=======================================================================

SUBROUTINE stopping_crit_co2(cell_area,co2ice_ini_surf,ini_co2ice_sublim,co2_ice,stopPEM,ngrid,global_avg_press_PCM,global_avg_press_new,nslope)

use time_evol_mod, only: co2_ice_crit, ps_criterion
use comslope_mod,  only: subslope_dist

implicit none

!=======================================================================
!
! Routine to check if the co2 and pressure criteria to stop the PEM are reached
!
!=======================================================================
! Inputs
!-------
integer,                          intent(in) :: ngrid, nslope        ! # of grid physical grid points
real,    dimension(ngrid),        intent(in) :: cell_area            ! Area of the cells
real,    dimension(ngrid,nslope), intent(in) :: co2_ice              ! Actual density of co2 ice
real,                             intent(in) :: co2ice_ini_surf      ! Initial surface of sublimatingco2 ice
logical, dimension(ngrid,nslope), intent(in) :: ini_co2ice_sublim    ! Grid points where co2 ice was initially sublimating
real,                             intent(in) :: global_avg_press_PCM ! Planet average pressure from the PCM start files
real,                             intent(in) :: global_avg_press_new ! Planet average pressure from the PEM computations
! Outputs
!--------
integer, intent(inout) :: stopPEM ! Stopping criterion code

! Locals
! ------
integer :: i, islope       ! Loop
real    :: co2ice_now_surf ! Current surface of co2 ice

!=======================================================================
! Computation of the present surface of co2 ice still sublimating
co2ice_now_surf = 0.
do i = 1,ngrid
    do islope = 1,nslope
        if (ini_co2ice_sublim(i,islope) .and. co2_ice(i,islope) > 0.) co2ice_now_surf = co2ice_now_surf + cell_area(i)*subslope_dist(i,islope)
    enddo
enddo

! Check of the criterion
if (co2ice_now_surf < co2ice_ini_surf*(1. - co2_ice_crit)) then
    stopPEM = 3
    write(*,*) "Reason of stopping: the surface of co2 ice sublimating reaches the threshold"
    write(*,*) "co2ice_now_surf < co2ice_ini_surf*(1. - co2_ice_crit)", co2ice_now_surf < co2ice_ini_surf*(1. - co2_ice_crit)
    write(*,*) "Initial surface of co2 ice sublimating =", co2ice_ini_surf
    write(*,*) "Current surface of co2 ice sublimating =", co2ice_now_surf
    write(*,*) "Percentage of change accepted =", co2_ice_crit*100.
else if (co2ice_now_surf > co2ice_ini_surf*(1. + co2_ice_crit)) then
    stopPEM = 3
    write(*,*) "Reason of stopping: the surface of co2 ice sublimating reaches the threshold"
    write(*,*) "co2ice_now_surf > co2ice_ini_surf*(1. + co2_ice_crit)", co2ice_now_surf > co2ice_ini_surf*(1. + co2_ice_crit)
    write(*,*) "Current surface of co2 ice sublimating =", co2ice_now_surf
    write(*,*) "Initial surface of co2 ice sublimating =", co2ice_ini_surf
    write(*,*) "Percentage of change accepted =", co2_ice_crit*100.
endif

if (abs(co2ice_ini_surf) < 1.e-5) stopPEM = 0

if (global_avg_press_new < global_avg_press_PCM*(1. - ps_criterion)) then
    stopPEM = 4
    write(*,*) "Reason of stopping: the global pressure reaches the threshold"
    write(*,*) "global_avg_press_new < global_avg_press_PCM*(1. - ps_criterion)", global_avg_press_new < global_avg_press_PCM*(1. - ps_criterion)
    write(*,*) "Initial global pressure =", global_avg_press_PCM
    write(*,*) "Current global pressure =", global_avg_press_new
    write(*,*) "Percentage of change accepted =", ps_criterion*100.
else if (global_avg_press_new > global_avg_press_PCM*(1. + ps_criterion)) then
    stopPEM = 4
    write(*,*) "Reason of stopping: the global pressure reaches the threshold"
    write(*,*) "global_avg_press_new > global_avg_press_PCM*(1. + ps_criterion)", global_avg_press_new > global_avg_press_PCM*(1. + ps_criterion)
    write(*,*) "Initial global pressure =", global_avg_press_PCM
    write(*,*) "Current global pressure =", global_avg_press_new
    write(*,*) "Percentage of change accepted =", ps_criterion*100.
endif

END SUBROUTINE stopping_crit_co2

END MODULE