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import csv
import json
import argparse

parser = argparse.ArgumentParser(description='Choose destinations for space stations')
parser.add_argument('--file', type=str, help='CSV file with tracks data')
parser.add_argument('--motor', type=str, default='puls', help='Type of motors to filter on')
args = parser.parse_args()

with open(args.file, newline='') as csvfile:
    reader = csv.DictReader(csvfile, delimiter=':')
    data = [row for row in reader if row['motor'] == args.motor]


destinations = {}
for row in data:
    ship = row['ship']
    start = row['start']
    destination = row['destination']
    if ship not in destinations:
        destinations[ship] = []
    destinations[ship].append(start)
    destinations[ship].append(destination)

with open('destinations.json', 'w') as outfile:
    json.dump(destinations, outfile)