;+
; NAME: netcdf_input.pro
;
; PURPOSE: Reads coordinates, data and mask
;
; CATEGORY: Subroutine
;
; CALLING SEQUENCE: netcdf_input, mask
;
; INPUTS:
;
;          maskfile  : name of mask file
;          gridfile  : name of grid file
;          mask_name : mask name
;  SCALAR FIELD :
;          datafile  : name of input data file
;          lon_name  : name of output longitude variable
;          lat_name  : name of output latitude variable
;  VECTOR FIELD :
;          data_u_file  : name of input data x-component file
;          data_v_file  : name of input data y-component file
;          lon_u_name   : name of output longitude variable at u-point
;          lat_u_name     : name of output latitude variable at u-point
;          lon_v_name     : name of output longitude variable at v-point
;          lat_v_name     : name of output latitude variable at v-point
;          lon_f_name     : name of output longitude variable at f-point
;          lat_f_name     : name of output latitude variable at f-point
;
; KEYWORD PARAMETERS: None
;
; OUTPUTS:
;          mask     : mask of the origin grid
;          nummsk   : ID of input mask file
;          nummsh   : ID of output coordinates and mask file
;  SCALAR FIELD :
;          lon_t  : longitudes of target grid at t-point
;          lat_t  : latitudes of target grid at t-point
;          numdta : ID of input data file
;  VECTOR FIELD :
;          lon_u    : longitudes of target grid at u-point
;          lat_u    : latitudes of target grid at u-point
;          lon_v    : longitudes of target grid at v-point
;          lat_v    : latitudes of target grid at v-point
;          lon_f    : longitudes of target grid at f-point
;          lat_f    : latitudes of target grid at f-point
;          numdta_u : ID of input data x-component file
;          numdta_v : ID of input data y-component file
;
; COMMON BLOCKS:
;          common_interp.pro
;
; SIDE EFFECTS:
;
; RESTRICTIONS:
;
; EXAMPLE:
;
; MODIFICATION HISTORY: 11/99 A. Jouzeau
;                       08/00 A. Jouzeau
;                       03/2003 R.Hordoir Added reading of meridian
;                       axis in input file
;
;-
;------------------------------------------------------------
;------------------------------------------------------------
;------------------------------------------------------------
PRO netcdf_input, mask
@common_interp
;
; 0. Opening files
; ================
;
printf, 40, ''
IF keyword_set(key_mask) THEN nummsk = ncdf_open(input_dir+ '/'+ maskfile)
IF keyword_set(key_mask) THEN printf, 40, maskfile, ' opening OK'
IF keyword_set(nscal) THEN BEGIN
   numdta_u = ncdf_open(string(input_dir, '/', data_u_file))
   printf, 40, data_u_file, ' opening OK'
   numdta_v = ncdf_open(string(input_dir, '/', data_v_file))
   IF data_u_file NE data_v_file THEN printf, 40, data_v_file, ' opening OK'
ENDIF ELSE BEGIN
   numdta = ncdf_open(input_dir+ '/'+ datafile)
   printf, 40, datafile, ' opening OK'
ENDELSE
nummsh = ncdf_open(input_dir+ '/'+ gridfile)
printf, 40, gridfile, ' opening OK'
;
; 1. Reading coordinates of output grid
; =====================================
;
IF keyword_set(nscal) THEN BEGIN
   ncdf_varget, nummsh, lon_u_name, lon_u
   ncdf_varget, nummsh, lat_u_name, lat_u
   ncdf_varget, nummsh, lon_f_name, lon_f
   ncdf_varget, nummsh, lat_f_name, lat_f
   ncdf_varget, nummsh, lon_v_name, lon_v
   ncdf_varget, nummsh, lat_v_name, lat_v
   IF keyword_set(modlam) THEN BEGIN
      ii=where(lon_f gt 360)
      lon_f(ii)=lon_f(ii)-360
      ii=where(lon_u gt 360)
      lon_u(ii)=lon_u(ii)-360
      ii=where(lon_v gt 360)
      lon_v(ii)=lon_v(ii)-360
   ENDIF
ENDIF ELSE BEGIN
   ncdf_varget, nummsh, lon_name, lon_t
   ncdf_varget, nummsh, lat_name, lat_t
   IF keyword_set(modlam) THEN BEGIN
      ii=where(lon_t gt 360)
      lon_t(ii)=lon_t(ii)-360
   ENDIF
ENDELSE
printf, 40, ''
printf, 40, 'Coordinates of output grid reading OK'
;
; 2. Reading the Input Axis and data mask
; =======================================
;
; Input Axis Vertical Axis (Horizontal Axis is supposed to be fully regular)
       phi_input=replicate(0,jpiatm,jpjatm)

IF keyword_set(nscal) THEN BEGIN

       ncdf_varget, numdta_u,y_axis_u,phi_input_u, count = [jpiatm, jpjatm]
       ncdf_varget, numdta_v,y_axis_v,phi_input_v, count = [jpiatm, jpjatm]

       phi_input_u=phi_input_u(0,*)
       phi_input_v=phi_input_v(0,*)

ENDIF ELSE BEGIN


       ncdf_varget, numdta  ,y_axis  ,phi_input  , count = [ jpjatm]
;   modif FRED
       phi_input=reverse(phi_input)
;   fin modif FRED
;stop
;       phi_input=phi_input(0,*)

ENDELSE

; Data Mask

IF keyword_set(key_mask) THEN BEGIN
   IF keyword_set(ndim) THEN $
    ncdf_varget, nummsk, mask_name, mask, count = [jpiatm, jpjatm, jpkatm, 1] ELSE BEGIN

    IF keyword_set(key_2d) THEN $
       ncdf_varget, nummsk, mask_name, mask, count = [jpiatm, jpjatm] ELSE $
       ncdf_varget, nummsk, mask_name, mask, count = [jpiatm, jpjatm, 1, 1]
    ENDELSE

   printf, 40, ''
   printf, 40, 'Data mask reading OK'
ENDIF ELSE BEGIN
   IF keyword_set(ndim) THEN mask = replicate(1., jpiatm, jpjatm, jpkatm) ELSE $
    mask = replicate(1., jpiatm, jpjatm)
ENDELSE
;
; 3. Reading depths of input and output grids (3D field)
; ======================================================
;
IF keyword_set(ndim) THEN BEGIN
   IF keyword_set(ndep) THEN $
    ncdf_varget, numdta, datadept_name, datadept ELSE $
    ncdf_varget, nummsk, datadept_name, datadept
   ncdf_varget, nummsh, outdept_name, outdept
   datadept = float(datadept)
   outdept = float(outdept)
ENDIF
;
return
END