#!/usr/bin/env python

# Copyright 2018-2019 Alvaro Bartolome
# See LICENSE for details.

import random
import pkg_resources
import os


def get_random():
    """
    This function selects a random user agent in order to not get banned of the site due to high load of simultaneous requests.

    Returns
    -------
        returns a string with the random user agent to use
    """

    resource_package = __name__
    resource_path = '/'.join(('resources', 'user_agent_list.txt'))
    file = pkg_resources.resource_filename(resource_package, resource_path)

    if os.path.exists(file):
        with open(file, 'r') as f:
            try:
                lines = f.readlines()
                return str(random.choice(lines)).replace("\n", "")
            except IOError:
                raise IOError("ERR#016: unable to retrieve a random user agent")
