MODULE sbctide
   !!======================================================================
   !!                       ***  MODULE  sbctide  ***
   !! Initialization of tidal forcing
   !!======================================================================
   !! History :  9.0  !  2007  (O. Le Galloudec)  Original code
   !!----------------------------------------------------------------------
   USE oce            ! ocean dynamics and tracers variables
   USE dom_oce        ! ocean space and time domain
   USE phycst         ! physical constant
   USE daymod         ! calandar
   USE tide_mod       ! 
   !
   USE in_out_manager ! I/O units
   USE iom            ! xIOs server
   USE ioipsl         ! NetCDF IPSL library
   USE lbclnk         ! ocean lateral boundary conditions (or mpp link)

   IMPLICIT NONE
   PRIVATE

   PUBLIC sbc_tide
 
   !!----------------------------------------------------------------------
   !! NEMO/OCE 4.0 , NEMO Consortium (2018)
   !! $Id$
   !! Software governed by the CeCILL license (see ./LICENSE)
   !!----------------------------------------------------------------------
CONTAINS

   SUBROUTINE sbc_tide( kt )
      !!----------------------------------------------------------------------
      !!                 ***  ROUTINE sbc_tide  ***
      !!----------------------------------------------------------------------      
      INTEGER, INTENT( in ) ::   kt     ! ocean time-step
      INTEGER               ::   jk     ! dummy loop index
      INTEGER               ::   nsec_day_orig     ! Temporary variable
      !!----------------------------------------------------------------------
      
      IF( nsec_day == NINT(0.5_wp * rdt) .OR. kt == nit000 ) THEN      ! start a new day
         !
         !
         IF( ln_read_load )THEN
            IF ( kt == nit000 ) CALL tide_init_load
            amp_pot(:,:,:) = amp_load(:,:,:)
            phi_pot(:,:,:) = phi_load(:,:,:)
         ELSE 
            amp_pot(:,:,:) = 0._wp
            phi_pot(:,:,:) = 0._wp
         ENDIF
         pot_astro(:,:) = 0._wp
         !
         ! If the run does not start from midnight then need to initialise tides
         ! at the start of the current day (only occurs when kt==nit000)
         ! Temporarily set nsec_day to beginning of day.
         nsec_day_orig = nsec_day
         IF ( nsec_day /= NINT(0.5_wp * rdt) ) THEN 
            kt_tide = kt - (nsec_day - 0.5_wp * rdt)/rdt
            nsec_day = NINT(0.5_wp * rdt)
         ELSE
            kt_tide = kt 
         ENDIF
         CALL tide_harmo( omega_tide, v0tide, utide, ftide, ntide, nb_harmo )
         !
         !
         IF(lwp) THEN
            WRITE(numout,*)
            WRITE(numout,*) 'sbc_tide : Update of the components and (re)Init. the potential at kt=', kt
            WRITE(numout,*) '~~~~~~~~ '
            DO jk = 1, nb_harmo
               WRITE(numout,*) Wave(ntide(jk))%cname_tide, utide(jk), ftide(jk), v0tide(jk), omega_tide(jk)
            END DO
         ENDIF
         !
         IF( ln_tide_pot )   CALL tide_init_potential
         !
         ! Reset nsec_day
         nsec_day = nsec_day_orig 
      ENDIF
      !
   END SUBROUTINE sbc_tide

  !!======================================================================
END MODULE sbctide