import random
import os
import shutil
import time

user_data_lifetime_seconds = 2*60*60
data_path = "user_data"
users = dict([])

if os.path.exists(data_path):
    shutil.rmtree(data_path)

def delete_old_users(session):
    for ID in users.copy():
        elapsed = time.time() - users[ID]["last accessed"]

        if (elapsed > user_data_lifetime_seconds):
            print(ID, "Hasn't accessed their files in", elapsed, "seconds, removing all user data")

            shutil.rmtree(users[ID]["path"])
            del users[ID]

new_user_handler_func = None


def new_user_handler(func):
    global new_user_handler_func
    new_user_handler_func = func
    return func


def new_user(session):
    while(True):
        ID = random.randint(0, 100000000)
        if not ID in users:
            break

    users[ID] = {
        "path": data_path + "/" + str(ID),
        "last accessed": time.time()
    }

    session["ID"] = ID

    os.makedirs(users[session["ID"]]["path"])

    if new_user_handler_func:
        new_user_handler_func(session)


def get_file_path(session, filename):
    return os.path.join(get_folder_path(session), filename)


def file_exists(session, filename):
    return os.path.exists(get_file_path(session, filename))


def check_for_new_user(session):
    if not "ID" in session:
        new_user(session)
    elif not session["ID"] in users:
        new_user(session)

    delete_old_users(session)


def get_folder_path(session):
    check_for_new_user(session)
    ID = session["ID"]
    user = users[ID]

    user["last accessed"] = time.time()

    return user["path"]