import traceback
import sys

from gribapi import *

INPUT='../../data/tigge_pf_ecmwf.grib2'
VERBOSE=1 # verbose error reporting

def example():
    f = open(INPUT)

    mcount = grib_count_in_file(f)
    gid_list = [grib_new_from_file(f) for i in range(mcount)]

    f.close()

    keys = [
        'Ni',
        'Nj',
        'latitudeOfFirstGridPointInDegrees',
        'longitudeOfFirstGridPointInDegrees',
        'latitudeOfLastGridPointInDegrees',
        'longitudeOfLastGridPointInDegrees',
        'jDirectionIncrementInDegrees',
        'iDirectionIncrementInDegrees',
        ]

    for i in range(mcount):
        gid = gid_list[i]

        print "processing message number",i+1

        for key in keys:
            print '%s=%g' % (key,grib_get(gid,key))

        print 'There are %d, average is %g, min is %g, max is %g' % (
                  grib_get_size(gid,'values'),
                  grib_get(gid,'average'),
                  grib_get(gid,'min'),
                  grib_get(gid,'max')
               )

        print '-'*100

        grib_release(gid)


def main():
    try:
        example()
    except GribInternalError,err:
        if VERBOSE:
            traceback.print_exc(file=sys.stderr)
        else:
            print >>sys.stderr,err.msg

        return 1

if __name__ == "__main__":
    sys.exit(main())