import sys
import argparse

import dateparser
from pytz.exceptions import UnknownTimeZoneError


parser = argparse.ArgumentParser()
parser.add_argument('human_dt', help="datetime-like string")
parser.add_argument('human_tz', nargs='?', help="timezone-like or location string")
parser.add_argument('--format', dest='format', default='%Y-%m-%d %H:%M:%S%z')
args = parser.parse_args()

human_dt = args.human_dt
human_tz = args.human_tz

try:
    # first try parsing the timezone from user input
    if human_tz:
        result = dateparser.parse(human_dt, settings={'TO_TIMEZONE': human_tz})
    else:
        result = dateparser.parse(human_dt)
except UnknownTimeZoneError:
    # we don't know this timezone one, assume location
    import random
    import string
    
    from geopy.geocoders import Nominatim
    from geopy.exc import GeocoderTimedOut
    from timezonefinder import TimezoneFinder

    user_agent = ''.join(random.choices(string.ascii_uppercase + string.digits, k=20))
    geolocator = Nominatim(user_agent=user_agent)
    try:
        location = geolocator.geocode(human_tz)
    except GeocoderTimedOut:
        print("Timed out resolving location. Try specifying a timezone directly", file=sys.stderr)
        exit(1)
    
    
    tzf = TimezoneFinder()
    loc_tz = tzf.timezone_at(lng=location.longitude, lat=location.latitude)
    result = dateparser.parse(human_dt, settings={'TO_TIMEZONE': loc_tz})
    
if result is None:
    print("Could not parse '{human_dt}' or '{human_tz}'".format(human_dt, human_tz), file=sys.stderr)
    exit(1)

formatted_result = result.strftime(args.format)
print(formatted_result)