#!/usr/bin/env python3

import subprocess
import sys

import captaintrain as ct


if __name__ == "__main__":
    # Parse command line arguments
    import argparse
    parser = argparse.ArgumentParser()

    parser.add_argument("-S", "--system", choices=ct.CT_SYSTEMS, action="append",
                        help="backends in which search trips")

    parser.add_argument("-A", "--age", type=int, default=27,
                        help="your age")
    parser.add_argument("-C", "--card", choices=ct.CT_CARDS, action="append", default=[],
                        help="indicate cards you own")

    parser.add_argument("departure_station", metavar='departure-station',
                        help="name of the departure station")
    parser.add_argument("via_station", metavar='via-station', nargs="?",
                        help="name of a station you want on your trip")
    parser.add_argument('arrival_station', metavar="arrival-station",
                        help="name of the arrival station")
    parser.add_argument('departure_date', metavar="departure-date", default="now",
                        help="any string parsable by date -d")

    args = parser.parse_args()

    # Validate Systems
    if args.system is None:
        args.system = ct.CT_SYSTEMS

    res = None
    with open("rescaen.json") as f:
        import json
        res = ct.Search(**json.load(f))

    # Search departure station
    departure = ct.station(args.departure_station)
    if departure is None:
        print("Unknown station '%s'" % args.departure_station)
        sys.exit(1)
    print("From: %s (%s)" % (departure.name, departure.id))

    # Search arrival station
    arrival = ct.station(args.arrival_station)
    if arrival is None:
        print("Unknown station '%s'" % args.arrival_station)
        sys.exit(1)
    print("To: %s (%s)" % (arrival.name, arrival.id))

    # Search via station
    if args.via_station is not None:
        via = ct.station(args.via_station)
        if via is None:
            print("Unknown station '%s'" % args.via_station)
            sys.exit(1)
        print("Via: %s (%s)" % (via.name, via.id))
    else:
        via = None

    # Determine departure time
    departure_time = 0
    with subprocess.Popen(["date", "-d", args.departure_date, "-u", "-Iseconds"], stdout=subprocess.PIPE) as f:
        departure_time = f.stdout.read().strip().decode()

    if departure_time == 0 or departure_time == "":
        sys.exit(1)
    else:
        departure_time = ct.parse_datetime(departure_time)
    print("Departure on: %s" % departure_time)


    # Do things
    res = ct.search(departure, arrival, departure_time, via=via, systems=args.system, age=args.age, cards=args.card)

    for trip in ct.cheapest_trips(res.trips):
        print(trip)