#!/usr/bin/python3
import requests
import sys
import textwrap

api = 'https://api.steampowered.com/'
key = '63578AF8E85EDF1E49411D5D4E18E166'
uid = '76561198008294872'

# Fetch JSON from url and run it through transform, pretty printing errors
# and the data worked on as exhaustively as possible.
def json_query(url, transform, params={}):
    try:
        result = requests.get(url, params)
    except ConnectionError:
        print("Network connection error.")
        sys.exit(1)
    try:
        data = result.json()
    except JSONDecodeError as err:
        print('Error when decoding JSON:\nFrom endpoint ' + url + ':\n' + err + '\n' + result + '\n')
        sys.exit(1)
    try:
        return transform(data)
    except (IndexError, KeyError) as err:
        print('Error when traversing JSON:\nFrom endpoint ' + url + ':\n' + err)
        pprint.PrettyPrinter(indent=2).pprint(data)
        sys.exit(1)

def steam_query(endpoint, transform, params={}):
    new_params = params.copy()
    new_params['key'] = key
    json_query(api + endpoint + '/', transform, new_params)

def get_friend_list():
    params = {
            'steamid' : uid,
            'relationship' : 'friend'
            }
    return steam_query('SteamUser/GetFriendList/v0001' lambda data: [friend['steamid'] for friend in data], params)

def main():
    for steamid in get_friend_list():
        print(steamid)

if __name__ == '__main__':
    main()