MODULE read_data_PCM_mod

use netcdf, only: nf90_open, NF90_NOWRITE, nf90_noerr, nf90_strerror, &
                  nf90_get_var, nf90_inq_varid, nf90_inq_dimid,       &
                  nf90_inquire_dimension, nf90_close

implicit none

character(13), parameter :: modname = 'read_data_PCM'
character(256)           :: msg      ! for reading
integer                  :: fID, vID ! for reading

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

SUBROUTINE read_data_PCM(filename,timelen,iim_input,jjm_input,ngrid,nslope,vmr_co2_PCM_phys,ps_timeseries, &
                         min_co2_ice,min_h2o_ice,tsurf_avg,tsoil_avg,tsurf_PCM,tsoil_PCM,q_co2,q_h2o,      &
                         watersurf_density_avg,watersoil_density)
use comsoil_h,             only: nsoilmx
use comsoil_h_PEM,         only: soil_pem
use constants_marspem_mod, only: m_co2, m_noco2

implicit none

!=======================================================================
!
! Purpose: Read initial confitions file from the PCM
!
! Authors: RV & LL
!=======================================================================

include "dimensions.h"

!=======================================================================
! Arguments:
character(*), intent(in) :: filename                            ! File name
integer,      intent(in) :: timelen                             ! number of times stored in the file
integer,      intent(in) :: iim_input, jjm_input, ngrid, nslope ! number of points in the lat x lon dynamical grid, number of subgrid slopes
! Ouputs
real, dimension(ngrid,nslope),         intent(out) :: min_co2_ice      ! Minimum of co2 ice per slope of the year [kg/m^2]
real, dimension(ngrid,nslope),         intent(out) :: min_h2o_ice      ! Minimum of h2o ice per slope of the year [kg/m^2]
real, dimension(ngrid,timelen),        intent(out) :: vmr_co2_PCM_phys ! Physics x Times co2 volume mixing ratio retrieve from the PCM [m^3/m^3]
real, dimension(ngrid,timelen),        intent(out) :: ps_timeseries    ! Surface Pressure [Pa]
real, dimension(ngrid,timelen),        intent(out) :: q_co2            ! CO2 mass mixing ratio in the first layer [kg/m^3]
real, dimension(ngrid,timelen),        intent(out) :: q_h2o            ! H2O mass mixing ratio in the first layer [kg/m^3]
!SOIL
real, dimension(ngrid,nslope),                 intent(out) :: tsurf_avg             ! Average surface temperature of the concatenated file [K]
real, dimension(ngrid,nsoilmx,nslope),         intent(out) :: tsoil_avg             ! Average soil temperature of the concatenated file [K]
real, dimension(ngrid,nslope,timelen),         intent(out) :: tsurf_PCM             ! Surface temperature of the concatenated file, time series [K]
real, dimension(ngrid,nsoilmx,nslope,timelen), intent(out) :: tsoil_PCM             ! Soil temperature of the concatenated file, time series [K]
real, dimension(ngrid,nslope),                 intent(out) :: watersurf_density_avg ! Water density at the surface [kg/m^3]
real, dimension(ngrid,nsoilmx,nslope,timelen), intent(out) :: watersoil_density     ! Water density in the soil layer, time series [kg/m^3]
!=======================================================================
! Local Variables
integer                         :: i, j, l, t                                                    ! loop variables
real                            :: A, B, mmean                                                   ! Molar Mass of co2 and no co2, A;B intermediate variables to compute the mean molar mass of the layer
integer                         :: islope                                                        ! loop for variables
character(2)                    :: num                                                           ! for reading sloped variables
real, dimension(iim_input + 1,jjm_input + 1,nslope,timelen)         :: h2o_ice_s_dyn             ! h2o ice per slope of the concatenated file [kg/m^2]
real, dimension(iim_input + 1,jjm_input + 1,nslope,timelen)         :: watercap
real, dimension(iim_input + 1,jjm_input + 1,nslope,timelen)         :: perennial_co2ice
real, dimension(iim_input + 1,jjm_input + 1,timelen)                :: vmr_co2_PCM               ! CO2 volume mixing ratio in the first layer [mol/m^3]
real, dimension(iim_input + 1,jjm_input + 1,timelen)                :: ps_PCM                    ! Surface Pressure [Pa]
real, dimension(iim_input + 1,jjm_input + 1,nslope)                 :: min_co2_ice_dyn
real, dimension(iim_input + 1,jjm_input + 1,nslope)                 :: min_h2o_ice_dyn
real, dimension(iim_input + 1,jjm_input + 1,nslope)                 :: tsurf_avg_dyn             ! Average surface temperature of the concatenated file [K]
real, dimension(iim_input + 1,jjm_input + 1,nsoilmx,nslope)         :: tsoil_avg_dyn             ! Average soil temperature of the concatenated file [K]
real, dimension(iim_input + 1,jjm_input + 1,nslope,timelen)         :: tsurf_PCM_dyn             ! Surface temperature of the concatenated file, time series [K]
real, dimension(iim_input + 1,jjm_input + 1,nsoilmx,nslope,timelen) :: tsoil_PCM_dyn             ! Soil temperature of the concatenated file, time series [K]
real, dimension(iim_input + 1,jjm_input + 1,timelen)                :: q_co2_dyn                 ! CO2 mass mixing ratio in the first layer [kg/m^3]
real, dimension(iim_input + 1,jjm_input + 1,timelen)                :: q_h2o_dyn                 ! H2O mass mixing ratio in the first layer [kg/m^3]
real, dimension(iim_input + 1,jjm_input + 1,nslope,timelen)         :: co2_ice_slope_dyn         ! co2 ice amount per slope of the year [kg/m^2]
real, dimension(iim_input + 1,jjm_input + 1,nslope,timelen)         :: watersurf_density_dyn     ! Water density at the surface, time series [kg/m^3]
real, dimension(iim_input + 1,jjm_input + 1,nslope)                 :: watersurf_density_dyn_avg ! Water density at the surface, dynamic grid, yearly averaged [kg/m^3]
real, dimension(iim_input + 1,jjm_input + 1,nsoilmx,nslope,timelen) :: watersoil_density_dyn     ! Water density in the soil layer, time series [kg/m^3]
!-----------------------------------------------------------------------
! Open the NetCDF file
write(*,*) "Opening "//filename//"..."
call error_msg(NF90_OPEN(filename,NF90_NOWRITE,fID),"open",filename)

! Download the data from the file
call get_var3("ps",ps_PCM)
write(*,*) "Data for surface pressure downloaded!"

call get_var3("co2_layer1",q_co2_dyn)
write(*,*) "Data for vmr co2 downloaded!"

call get_var3("h2o_layer1",q_h2o_dyn)
write(*,*) "Data for vmr h2o downloaded!"

if (nslope == 1) then ! There is no slope
    call get_var3("co2ice",co2_ice_slope_dyn(:,:,1,:))
    write(*,*) "Data for co2_ice downloaded!"

    call get_var3("h2o_ice_s",h2o_ice_s_dyn(:,:,1,:))
    write(*,*) "Data for h2o_ice_s downloaded!"

    call get_var3("tsurf",tsurf_PCM_dyn(:,:,1,:))
    write(*,*) "Data for tsurf downloaded!"

#ifndef CPP_STD
    call get_var3("watercap",watercap(:,:,1,:))
    write(*,*) "Data for watercap downloaded!"

    call get_var3("perennial_co2ice",perennial_co2ice(:,:,1,:))
    write(*,*) "Data for perennial_co2ice downloaded!"

    if (soil_pem) then
        call get_var4("soiltemp",tsoil_PCM_dyn(:,:,:,1,:))
        write(*,*) "Data for soiltemp downloaded!"

        call get_var4("waterdensity_soil",watersoil_density_dyn(:,:,:,1,:))
        write(*,*) "Data for waterdensity_soil downloaded!"

        call get_var3("waterdensity_surface",watersurf_density_dyn(:,:,1,:))
        write(*,*) "Data for waterdensity_surface downloaded!"
    endif !soil_pem
#endif
else ! We use slopes
    do islope = 1,nslope
        write(num,'(i2.2)') islope
        call get_var3("co2ice_slope"//num,co2_ice_slope_dyn(:,:,islope,:))
    enddo
    write(*,*) "Data for co2_ice downloaded!"

    do islope = 1,nslope
        write(num,'(i2.2)') islope
        call get_var3("h2o_ice_s_slope"//num,h2o_ice_s_dyn(:,:,islope,:))
    enddo
    write(*,*) "Data for h2o_ice_s downloaded!"

    do islope = 1,nslope
        write(num,'(i2.2)') islope
        call get_var3("tsurf_slope"//num,tsurf_PCM_dyn(:,:,islope,:))
    enddo
    write(*,*) "Data for tsurf downloaded!"

#ifndef CPP_STD
    do islope = 1,nslope
        write(num,'(i2.2)') islope
        call get_var3("watercap_slope"//num,watercap(:,:,islope,:))
    enddo
    write(*,*) "Data for watercap downloaded!"

    do islope = 1,nslope
        write(num,'(i2.2)') islope
        call get_var3("perennial_co2ice_slope"//num,perennial_co2ice(:,:,islope,:))
    enddo
    write(*,*) "Data for perennial_co2ice downloaded!"

    if (soil_pem) then
        do islope = 1,nslope
            write(num,'(i2.2)') islope
            call get_var4("soiltemp_slope"//num,tsoil_PCM_dyn(:,:,:,islope,:))
        enddo
        write(*,*) "Data for soiltemp downloaded!"

        do islope = 1,nslope
            write(num,'(i2.2)') islope
            call get_var4("waterdensity_soil_slope"//num,watersoil_density_dyn(:,:,:,islope,:))
        enddo
        write(*,*) "Data for waterdensity_soil downloaded!"

        do islope = 1,nslope
            write(num,'(i2.2)') islope
            call get_var3("waterdensity_surface"//num,watersurf_density_dyn(:,:,islope,:))
        enddo
        write(*,*) "Data for waterdensity_surface downloaded!"
    endif !soil_pem
#endif
endif

! Close the NetCDF file
write(*,*) "Closing "//filename//"..."
call error_msg(nf90_close(fID),"close",filename)

! Compute the minimum over the year for each point
write(*,*) "Computing the min of h2o_ice..."
where (h2o_ice_s_dyn < 0.) h2o_ice_s_dyn = 0.
min_h2o_ice_dyn = minval(h2o_ice_s_dyn + watercap,4)
write(*,*) "Computing the min of co2_ice..."
where (co2_ice_slope_dyn < 0.) co2_ice_slope_dyn = 0.
min_co2_ice_dyn = minval(co2_ice_slope_dyn + perennial_co2ice,4)

! Compute averages over the year for each point
write(*,*) "Computing the average of tsurf..."
tsurf_avg_dyn = sum(tsurf_PCM_dyn,4)/timelen

if (soil_pem) then
    write(*,*) "Computing average of tsoil..."
    tsoil_avg_dyn = sum(tsoil_PCM_dyn,5)/timelen
    write(*,*) "Computing average of waterdensity_surface..."
    watersurf_density_dyn_avg = sum(watersurf_density_dyn,4)/timelen
endif

! By definition, we get rid of the negative values
A = (1./m_co2 - 1./m_noco2)
B = 1./m_noco2
do i = 1,iim + 1
    do j = 1,jjm_input + 1
        do t = 1, timelen
            if (q_co2_dyn(i,j,t) < 0) then
                q_co2_dyn(i,j,t) = 1.e-10
            else if (q_co2_dyn(i,j,t) > 1) then
                q_co2_dyn(i,j,t) = 1.
            endif
            if (q_h2o_dyn(i,j,t) < 0) then
                q_h2o_dyn(i,j,t) = 1.e-10
            else if (q_h2o_dyn(i,j,t) > 1) then
                q_h2o_dyn(i,j,t) = 1.
            endif
            mmean = 1/(A*q_co2_dyn(i,j,t) + B)
            vmr_co2_PCM(i,j,t) = q_co2_dyn(i,j,t)*mmean/m_co2
        enddo
    enddo
enddo

#ifndef CPP_1D
    call gr_dyn_fi(timelen,iim_input + 1,jjm_input + 1,ngrid,vmr_co2_PCM,vmr_co2_PCM_phys)
    call gr_dyn_fi(timelen,iim_input + 1,jjm_input + 1,ngrid,ps_PCM,ps_timeseries)
    call gr_dyn_fi(timelen,iim_input + 1,jjm_input + 1,ngrid,q_co2_dyn,q_co2)
    call gr_dyn_fi(timelen,iim_input + 1,jjm_input + 1,ngrid,q_h2o_dyn,q_h2o)

    do islope = 1,nslope
        call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,min_co2_ice_dyn(:,:,islope),min_co2_ice(:,islope))
        call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,min_h2o_ice_dyn(:,:,islope),min_h2o_ice(:,islope))
        if (soil_pem) then
            do l = 1,nsoilmx
                call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,tsoil_avg_dyn(:,:,l,islope),tsoil_avg(:,l,islope))
                do t = 1,timelen
                    call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,tsoil_PCM_dyn(:,:,l,islope,t),tsoil_PCM(:,l,islope,t))
                    call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,watersoil_density_dyn(:,:,l,islope,t),watersoil_density(:,l,islope,t))
                enddo
            enddo
            call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,watersurf_density_dyn_avg(:,:,islope),watersurf_density_avg(:,islope))
        endif ! soil_pem
        do t = 1,timelen
            call gr_dyn_fi(1,iim_input + 1,jjm_input + 1,ngrid,tsurf_PCM_dyn(:,:,islope,t),tsurf_PCM(:,islope,t))
        enddo
    enddo

    call gr_dyn_fi(nslope,iim_input + 1,jjm_input + 1,ngrid,tsurf_avg_dyn,tsurf_avg)
#else
    vmr_co2_PCM_phys(1,:) = vmr_co2_PCM(1,1,:)
    ps_timeseries(1,:) = ps_PCM(1,1,:)
    q_co2(1,:) = q_co2_dyn(1,1,:)
    q_h2o(1,:) = q_h2o_dyn(1,1,:)
    min_co2_ice(1,:) = min_co2_ice_dyn(1,1,:)
    min_h2o_ice(1,:) = min_h2o_ice_dyn(1,1,:)
    if (soil_pem) then
        tsoil_avg(1,:,:) = tsoil_avg_dyn(1,1,:,:)
        tsoil_PCM(1,:,:,:) = tsoil_PCM_dyn(1,1,:,:,:)
        watersoil_density(1,:,:,:) = watersoil_density_dyn(1,1,:,:,:)
        watersurf_density_avg(1,:) = watersurf_density_dyn_avg(1,1,:)
    endif ! soil_pem
    tsurf_PCM(1,:,:) = tsurf_PCM_dyn(1,1,:,:)
    tsurf_avg(1,:) = tsurf_avg_dyn(1,1,:)
#endif

END SUBROUTINE read_data_PCM

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

SUBROUTINE check_dim(n1,n2,str1,str2)

implicit none

integer,            intent(in) :: n1, n2
character(len = *), intent(in) :: str1, str2

character(256) :: s1, s2

if (n1 /= n2) then
    s1 = 'value of '//trim(str1)//' ='
    s2 = ' read in starting file differs from parametrized '//trim(str2)//' ='
    write(msg,'(10x,a,i4,2x,a,i4)')trim(s1),n1,trim(s2),n2
    call abort_gcm(trim(modname),trim(msg),1)
endif

END SUBROUTINE check_dim

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

SUBROUTINE get_var1(var,v)

implicit none

character(len = *), intent(in)  :: var
real, dimension(:), intent(out) :: v

call error_msg(NF90_INQ_VARID(fID,var,vID),"inq",var)
call error_msg(NF90_GET_VAR(fID,vID,v),"get",var)

END SUBROUTINE get_var1

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

SUBROUTINE get_var3(var,v) ! on U grid

implicit none

character(len = *),     intent(in)  :: var
real, dimension(:,:,:), intent(out) :: v

call error_msg(NF90_INQ_VARID(fID,var,vID),"inq",var)
call error_msg(NF90_GET_VAR(fID,vID,v),"get",var)

END SUBROUTINE get_var3

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

SUBROUTINE get_var4(var,v)

implicit none

character(len = *),       intent(in)  :: var
real, dimension(:,:,:,:), intent(out) :: v

call error_msg(NF90_INQ_VARID(fID,var,vID),"inq",var)
call error_msg(NF90_GET_VAR(fID,vID,v),"get",var)

END SUBROUTINE get_var4

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

SUBROUTINE error_msg(ierr,typ,nam)

implicit none

integer,            intent(in) :: ierr !--- NetCDF ERROR CODE
character(len = *), intent(in) :: typ  !--- TYPE OF OPERATION
character(len = *), intent(in) :: nam  !--- FIELD/FILE NAME

if (ierr == nf90_noerr) return
select case(typ)
    case('inq');   msg="Field <"//trim(nam)//"> is missing"
    case('get');   msg="Reading failed for <"//trim(nam)//">"
    case('put');   msg="Writing failed for <"//trim(nam)//">"
    case('open');  msg="File opening failed for <"//trim(nam)//">"
    case('close'); msg="File closing failed for <"//trim(nam)//">"
    case default
        write(*,*) 'There is no message for this error.'
        error stop
end select
call abort_gcm(trim(modname),trim(msg),ierr)

END SUBROUTINE error_msg

END MODULE read_data_PCM_mod