#!/usr/bin/env python3
#
# download all gists for a user, pass github user as first arg
# if the gists have already been downloaded before then update them

import json
import os
import re

import requests
import sys
from subprocess import call


def slugify(value):
    value = re.sub('[^\w\s-]', '_', value).strip().lower()
    value = re.sub('[-\s]+', '_', value)
    return value


if __name__ == '__main__':

    user = sys.argv[1]

    r = requests.get('https://api.github.com/users/{0}/gists'.format(user))

    for gist in r.json():
        fname = next(iter(gist['files']))
        gist_dir = fname and slugify(fname)
        gist_dir = os.path.join('gists', f'{gist_dir}-{gist["id"]}')

        if not os.path.exists(gist_dir):
            # if the repo does not exist then do "git clone"
            call(['git', 'clone', gist['git_pull_url'], gist_dir])
        else:
            # if repo dir already exists then do "git pull"
            call(['git', '-C', gist_dir, 'pull'])

        if gist['comments']:
            comments_file = os.path.join(gist_dir, 'comments.json')

            with open(comments_file, 'w') as fh_comm:
                fh_comm.write(json.dumps(requests.get(gist['comments_url']).json(), indent=1, sort_keys=True))

        description_file = os.path.join(gist_dir, 'description.txt')
        with open(description_file, 'w') as fh_desc:
            fh_desc.write(f"{gist['description']}\n")
            fh_desc.write(f"json_url: {gist['url']}\n")
            fh_desc.write(f"html_url: {gist['html_url']}\n")
            fh_desc.write(f"pull_url: {gist['git_pull_url']}\n")
            fh_desc.write(f"id: {gist['id']}\n")
            fh_desc.write(f"date_updated: {gist['updated_at']}\n")
            fh_desc.write(f"files: {json.dumps(gist['files'], indent=1, sort_keys=True)}\n")