#!/usr/bin/env python3
import json
import subprocess
import sys
from typing import List

def list_users_in_groups(group_names: List[str]):
    groups_stack: List[str] = group_names;
    users: List[str] = [];

    while len(groups_stack) > 0:
        group_name = groups_stack.pop(0)
        # print("Processing group %s" % group_name)

        json_data = subprocess.check_output(["az", "ad",  "group", "member", "list", "--group", group_name])
        data = json.loads(json_data)

        for object in data:
            if object["objectType"] == "Group":
                # print("Adding group %s (%s) to stack..." % (object["mail"], object["objectId"]))
                groups_stack.append(object["objectId"])
            elif object["objectType"] == "User":
                if "mail" not in object:
                    raise Exception("user missing mail: %s" % object["objectid"])
                users.append(str.lower(object["mail"]))
            else:
                raise Exception("unknown object type: %s" % object["objectType"])

    return sorted(set(users))

def main(args: List[str]):
    print("\n".join(list_users_in_groups(args)))

def help():
    print("Usage: recursively-list-users-in-azure-ad-group.py <group name [..]>")

if __name__ == "__main__":
    if len(sys.argv) < 2:
        help()
    else:
        main(sys.argv[1:])