#!/bin/env python

import os, sys, string, re, time

# the EDEX installer prepends to LD_LIBRARY_PATH the path
# <edex_installation_dir>/lib, where <edex_installation_dir> is something like
# /awips (the default), /opt/awips, or $HOME/awips.
if not os.environ.has_key( "LD_LIBRARY_PATH" ):
    print ""
    print "LD_LIBRARY_PATH is not set.  Has EDEX been installed?"
    print "If so, open a new terminal and try again"
    print ""
    sys.exit( 1 )

lib_path = ""
lib_path_array = os.environ.get("LD_LIBRARY_PATH").split(":")
for elem in lib_path_array:
    if not elem.find("/awips/lib") == -1:
        lib_path = elem
        break

if len(lib_path) == 0:
    print ""
    print "can't find EDEX homedir.  Has EDEX been installed?"
    print ""
    sys.exit( 1 )

local_edex_sbn_dir = os.path.dirname( lib_path )
local_edex_sbn_dir += "/edex/opt/data/sbn"

grib_dir = local_edex_sbn_dir + "/grib"
os.chdir(grib_dir)

ftp_site="ftp://tgftp.nws.noaa.gov"

#
# Create the directory time variables from the "last" GMT hour
#

prevhour = time.strftime("%H", time.gmtime(time.time() - 10800.0))
prevdate = time.strftime("%Y%m%d", time.gmtime(time.time() - 10800.0))

if int(prevhour) > 12 and int(prevhour) <= 18:
   namhour="12"
if int(prevhour) > 18 and int(prevhour) <= 24:
   namhour="18"
if int(prevhour) > 0 and int(prevhour) <= 6:
   namhour="00"
if int(prevhour) > 6 and int(prevhour) <= 12:
   namhour="06"

print "Getting NAM12 files at " + prevhour + "Z"
print "On date: " + prevdate

#
# Get the files
#

filesToGet = ['fh.0000_tl.press_gr.awp218',
'fh.0006_tl.press_gr.awp218',
'fh.0012_tl.press_gr.awp218',
'fh.0018_tl.press_gr.awp218',
'fh.0024_tl.press_gr.awp218',
'fh.0030_tl.press_gr.awp218',
'fh.0036_tl.press_gr.awp218',
'fh.0042_tl.press_gr.awp218',
'fh.0048_tl.press_gr.awp218',
'fh.0054_tl.press_gr.awp218',
'fh.0060_tl.press_gr.awp218']

for each in filesToGet:
    try:
        os.system("wget " + ftp_site + "/SL.us008001/ST.opnl/MT.nam_CY." + namhour + "/RD." + prevdate + "/PT.grid_DF.gr2/" + each + " -O " + each + "." + prevdate + "." + prevhour)
    except:
        continue

print "files downloaded to the endpoint:  " + grib_dir